WorldWideScience

Sample records for pumped storage power plants

  1. How to Avoid Severe Incidents at Pumped Storage Power Plants

    Science.gov (United States)

    Yasuda, Masashi; Watanabe, Satoshi

    2016-11-01

    Pumped storage is now increasing its importance as the most powerful and reliable tool for stabilizing the electrical network, especially under the increase of intermittent power sources like wind-power and solar-power. However, pumped storage power plants have generally more machinery troubles than the conventional hydropower plants and sometimes they encountered unexpected severe incidents having long-term outage and a considerable restoration cost. The present paper provides some study results about general tendencies of machinery troubles in pumped storage, some examples of severe incidents mainly about the electro-mechanical troubles but also about the flood and fire, and possible scenarios which may lead into a severe result. Finally, it provides lessons learned and some recommendations to avoid severe incidents based on experiences.

  2. Improving the Energy Efficiency of Pumped-Storage Power Plants

    Energy Technology Data Exchange (ETDEWEB)

    Artyukh, S. F., E-mail: artjuch@mail.ru [Kharkov Polytechnic Institute (Ukraine); Galat, V. V. [JSC “UkrHydroEnergo” (Ukraine); Kuz’min, V. V. [JSC “Interregional Electricity Association ELTA” (Ukraine); Chervonenko, I. I. [Kharkov Polytechnic Institute (Ukraine); Shakaryan, Yu. G.; Sokur, P. V. [JSC “R& D Center at Federal Grid Company of Unified Energy System” (Russian Federation)

    2015-01-15

    Possible ways to improve the energy efficiency of hydroelectric generating sets of pumped-storage power plants (PSPPs) are studied. The Kiev PSPP is used as an example to show how its generating sets can be upgraded. It is concluded based on studies conducted that synchronous motor-generators should be replaced with asynchronized motor-generators. The feasibility of changing over the turbine to variable-speed operation is shown.

  3. A novel technology for control of variable speed pumped storage power plant

    Institute of Scientific and Technical Information of China (English)

    Seyed Mohammad Hassan Hosseini; Mohammad Reza Semsar

    2016-01-01

    Variable speed pumped storage machines are used extensively in wind power plant and pumped storage power plant. This paper presents direct torque and flux control (DTFC) of a variable speed pumped storage power plant (VSPSP). By this method both torque and flux have been applied to control the VSPSP. The comparison between VSPSP’s control strategies is studied. At the first, a wind turbine with the capacity 2.2 kW and DTFC control strategies simulated then a 250 MW VSPSP is simulated with all of its parts (including electrical, mechanical, hydraulic and its control system) by MATLAB software. In all of simulations, both converters including two-level voltage source converter (2LVSC) and three-level voltage source converter (3LVSC) are applied. The results of applying 2LVSC and 3LVSC are the rapid dynamic responses with better efficiency, reducing the total harmonic distortion (THD) and ripple of rotor torque and flux.

  4. Commercial Impact and Optimum Capacity Determination of Pumped Storage Hydro Plant for a Practical Power System

    Science.gov (United States)

    Latha, P. G.; Anand, S. R.; Imthias, Ahamed T. P.; Sreejith, P. S., Dr.

    2013-06-01

    This paper attempts to study the commercial impact of pumped storage hydro plant on the operation of a stressed power system. The paper further attempts to compute the optimum capacity of the pumped storage scheme that can be provided on commercial basis for a practical power system. Unlike the analysis of commercial aspects of pumped storage scheme attempted in several papers, this paper is presented from the point of view of power system management of a practical system considering the impact of the scheme on the economic operation of the system. A realistic case study is presented as the many factors that influence the pumped storage operation vary widely from one system to another. The suitability of pumped storage for the particular generation mix of a system is well explored in the paper. To substantiate the economic impact of pumped storage on the system, the problem is formulated as a short-term hydrothermal scheduling problem involving power purchase which optimizes the quantum of power to be scheduled and the duration of operation. The optimization model is formulated using an algebraic modeling language, AMPL, which is then solved using the advanced MILP solver CPLEX.

  5. The First Israeli Hydro-Electric Pumped Storage Power Plant Gilboa PSPP

    Science.gov (United States)

    Maruzewski, P., Dr.; Sautereau, T.; Sapir, Y.; Barak, H.; Hénard, F.; Blaix, J.-C.

    2016-11-01

    The Israeli Public Utilities Authority, PUA, decided to increase the instantaneous power available on the grid by adding Pumped Storage Power Plants, PSPP, to the existing generation capacity. PSP Investments Ltd. is a private investor that decided to develop the Gilboa PSPP. Its capacity is 300MWe. The project performance has to comply with PUA regulation for PSPP, and with all relevant Israeli laws and IECo standards. This paper itemizes an overview of the Gilboa PSPP through short summaries of units’ components from design step to manufacturing processes.

  6. Underfloor pumped storage power plants in facilities of coal mining; Unterflur-Pumpspeicherwerke in Anlagen des Steinkohlebergbaus

    Energy Technology Data Exchange (ETDEWEB)

    Perau, Eugen; Schreiber, Ulrich [Duisburg-Essen Univ., Essen (Germany). Fachgebiet Geotechnik; Niemann, Andre [Duisburg-Essen Univ., Essen (Germany). Inst. fuer Wasserbau und Wasserwirtschaft; Koch, Marco K. [Bochum Univ. (Germany)

    2012-11-01

    The energy policy turnaround involves a variety of urgent issues. To date, the production of energy is dominated by conventional power plants. Previously the renewable energy only serves to supplement the energy supply from conventional power plants. The desire for an always available and sufficient energy supply requires the need for energy storage in order to avoid fluctuations in energy loss. From this perspective, the authors of the contribution under consideration report on underfloor pumped storage plants in the coal industry.

  7. Feasibility study of a Green Power Plant. Final report. [Offshore pumped hydro storage

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2013-03-15

    This project is a technical evaluation and a feasibility study of a concept called the Green Power Plant (GPP), developed by Seahorn Energy Aps. The Green Power Plant is an offshore pumped hydro storage facility constructed from prefabricated elements and with integrated renewable energy production. Pumped hydro storage is a known technology with a proven roundtrip energy storage efficiency of 80%. The focus of the GPP project is on simplifying and industrializing the construction of the reservoir wall, thereby achieving a cost efficient solution. The reservoir structure is dependent on the site on which the reservoir is established, thus Kriegers Flak in the Baltic Sea has been chosen as basis for the technical evaluation. As soil conditions vary, the technical evaluations have been based on a general soil profile. A water depth of 25m has been chosen as basis for the evaluation. A reservoir with a diameter of 2 km has been evaluated as baseline scenario. Feasibility of the GPP was evaluated based on the cost and income estimates. For the baseline scenario an internal rate of return of 6.6% was found for a period of 35 years. A sensitivity analysis reveals internal rates of return over 35 years varying from 4.9% to 10.9%. Especially larger reservoir diameters increase profitability of the GPP. The results from this project will be utilized in raising funds for further development of the GPP concept. Seahorn Energy Aps aims at optimizing the wind turbine integration, the steel pile wall structure and the pump-turbine integration in a future project towards construction of a demonstration facility. (LN)

  8. Feasibility study for the partial conversion of a hydropower plant into a pumped-storage power plant: a case study of hydroelectric power plant La Barca (Asturias, Spain

    Directory of Open Access Journals (Sweden)

    E. Antuña Yudego

    2017-01-01

    Full Text Available Renewable energy sources have reported an unprecedented increase of global installed renewable power capacity. Against the advantages provided by this renewable power generation technology it should be taken into account an important issue: these intermittent energy sources supply a fluctuating output which is difficult to manage. Pumped-storage hydro power plants reappear in these circumstances as an efficient form of energy storage which allows to use reserves when necessary, enabling power generation output to cover continuously this energy demand. The present paper shows a simplified feasibility study of the partial conversion of hydropower plant La Barca, in Asturias, into a reversible storage through the development of an algorithm to simulate its operation according to electricity market prices. For this purpose, the operation in the deviation management market is considered and the technical modifications required for the conversion are shown. The estimation of costs and incomes present a feasible scenario.

  9. Modernisation of pumped storage power plant Waldeck I. Overhaul upper basin; Modernisierung des Pumpspeicherkraftwerkes Waldeck I. Sanierung des Oberbeckens

    Energy Technology Data Exchange (ETDEWEB)

    Koehn, Rolf-Guenter [Lahmeyer International, Bad Vilbel (Germany); Rau, Martin [E.ON Wasserkraft GmbH, Landshut (Germany)

    2010-07-01

    The Waldeck I pumped storage power plant is located near the Edersee Lake in Northern Hesse. The existing power plant, comprising four horizontal turbine and pump combination units with a total installed capacity of 140 MW, was commissioned in 1932. After some 75 years of operation, the plant had reached the end of its service life and the following modernisation concept was developed: Construction on the existing site of a new shaft power house with a pump turbine of approximately 70 MW capacity and refurbishment of two of the Francis turbines and decommissioning of all four pumps and two turbines in the old plant. The existing upper basin will be retained and extensively overhauled, including waterproof lining of the internal walls using a drained synthetic sealing membrane. (orig.)

  10. Simulation model of a variable-speed pumped-storage power plant in unstable operating conditions in pumping mode

    Science.gov (United States)

    Martínez-Lucas, G.; Pérez-Díaz, J. I.; Sarasúa, J. I.; Cavazzini, G.; Pavesi, G.; Ardizzon, G.

    2017-04-01

    This paper presents a dynamic simulation model of a laboratory-scale pumped-storage power plant (PSPP) operating in pumping mode with variable speed. The model considers the dynamic behavior of the conduits by means of an elastic water column approach, and synthetically generates both pressure and torque pulsations that reproduce the operation of the hydraulic machine in its instability region. The pressure and torque pulsations are generated each from a different set of sinusoidal functions. These functions were calibrated from the results of a CFD model, which was in turn validated from experimental data. Simulation model results match the numerical results of the CFD model with reasonable accuracy. The pump-turbine model (the functions used to generate pressure and torque pulsations inclusive) was up-scaled by hydraulic similarity according to the design parameters of a real PSPP and included in a dynamic simulation model of the said PSPP. Preliminary conclusions on the impact of unstable operation conditions on the penstock fatigue were obtained by means of a Monte Carlo simulation-based fatigue analysis.

  11. Simultaneous transient operation of a high head hydro power plant and a storage pumping station in the same hydraulic scheme

    Science.gov (United States)

    Bucur, D. M.; Dunca, G.; Cervantes, M. J.; Cǎlinoiu, C.; Isbǎşoiu, E. C.

    2014-03-01

    This paper presents an on-site experimental analysis of a high head hydro power plant and a storage pumping station, in an interconnected complex hydraulic scheme during simultaneous transient operation. The investigated hydropower site has a unique structure as the pumping station discharges the water into the hydropower plant penstock. The operation regimes were chosen for critical scenarios such as sudden load rejections of the turbines as well as start-ups and stops with different combinations of the hydraulic turbines and pumps operation. Several parameters were simultaneously measured such as the pumped water discharge, the pressure at the inlet pump section, at the outlet of the pumps and at the vane house of the hydraulic power plant surge tank. The results showed the dependence of the turbines and the pumps operation. Simultaneous operation of the turbines and the pumps is possible in safe conditions, without endangering the machines or the structures. Furthermore, simultaneous operation of the pumping station together with the hydropower plant increases the overall hydraulic efficiency of the site since shortening the discharge circuit of the pumps.

  12. Overall control and monitoring systems for pumped storage plants

    Energy Technology Data Exchange (ETDEWEB)

    Stepinski, B.; Cvetko, H.

    1982-01-01

    Experience and technical innovations in power plant engineering have resulted in continuous improvements of operation control, availability and safety of pumped storage plants. Process control is constantly improved as new developments are made in equipment and systems engineering. Plant control concepts with increasingly complex automation hierarchy are described by which pumped storage processes can be controlled optimally, reliably, and automatically.

  13. A contribution to water hammer analysis in pumped-storage power plants; Ein Beitrag zur Druckstossberechnung von Pumpspeicheranlagen

    Energy Technology Data Exchange (ETDEWEB)

    Hoeller, Stefan; Jaberg, Helmut [TU Graz (Austria). Inst. fuer Hydraulische Stroemungsmaschinen

    2013-03-01

    The operation of pumped-storage power plants induces a highly transient fluid flow in the penstock of high head water power plants. In the planning phase a reliable prediction of the transient plant behaviour in unsteady load cases such as e.g. machine start or switching load cases is necessary. Numerical simulation methods provide a tool to calculate the occurring pressure pulsations or mass oscillations as well as for the optimization of the transient behaviour. Commercial software-packages for water hammer simulations usually do not provide numerical models for a realistic calculation of complex components like surge tanks, turbines or emergency closing valves in a high head water power plant. But especially these components need to be modelled correctly in order to get a significant and reliable solution. This article shows the practice ofthe development of a custom-designed numerical model on the example of a pump turbine. (orig.)

  14. Optimal bidding in Turkey day ahead electricity market for wind energy and pumped storage hydro power plant

    Directory of Open Access Journals (Sweden)

    Ceyhun Yıldız

    2016-10-01

    Full Text Available In electrical grid; when the demand power increases energy prices increase, when the demand decreases energy prices decrease. For this reason; to increase the total daily income, it is required to shift generations to the hours that high demand power values occurred. Wind Power Plants (WPP have unstable and uncontrollable generation characteristic. For this reason, energy storage systems are needed to shift the generations of WPPs in time scale. In this study, four wind power plants (WPP which are tied to the Turkish interconnected grid and a pumped hydro storage power plant (PSPP that meets the energy storage requirement of these power plants are investigated in Turkey day ahead energy market. An optimization algorithm is developed using linear programming technique to maximize the day ahead market bids of these plants which are going to generate power together. When incomes and generations of the plants that are operated with optimization strategy is analyzed, it is seen that annual income increased by 2.737% compared with WPPs ‘s alone operation and generations are substantially shifted to the high demand power occurred hours.

  15. 抽水蓄能的开发模式与电力的发展%The development modes of pumped storage power plant and the power development

    Institute of Scientific and Technical Information of China (English)

    曹楚生

    2001-01-01

    The hydropower is a clean and renewable energy resources. China is rich in hydropower resources. Because of the unbalance of resource deployment and economic development and the needs of peaking and valley filling of power network, it is imperative for China to develop pumped-storage power plant. In order to give full play to the benefits of pumped-storage power plant, improve the quality of power supply and help the sustainable development of power system, the adoption of combined development way of pumped-storage power plant, thermal power plant, nuclear power plant, wind power plant and conventional hydropower station is, after all, a good development way.%水电是清洁可再生能源,我国是水能资源丰富的国家,但由于资源配置和经济发展的不平衡及电网调峰填谷等需要,发展抽水蓄能电站已势在必行。为更好地发挥抽水蓄能电站的效益,改善供电质量,有利于电力系统的可持续发展,采用抽水蓄能电站与火电、核电、风电厂或常规水电站联合开发的模式不失为一种好的模式。

  16. Pumped storage plants. Status and perspectives

    Energy Technology Data Exchange (ETDEWEB)

    Vennemann, Peter [RWE Power AG, Essen (Germany). Dept. for Electrical and Mechanical Engineering; Gruber, Karl Heinz; Kunsch, Andreas [VERBUND Hydro Power AG, Vienna (Austria); Haaheim, Jon Ulrik [Statkraft Energi AS, Oslo (Norway); Sistenich, Hans-Peter; Thoeni, Hans-Rudolf

    2011-07-01

    Pumped storage plants (PSP) enable the storage of energy with rated capacities of order of GW at a single site. Reservoirs allow charging and discharging times of at least hours, sometimes days or even up to several weeks. Short ramp-up times permit the participation in the secondary reserve market as a standing reserve. For bulk energy storage, PSP reach the lowest, specific costs. In the EU27 countries, Norway and Switzerland, a total of 44 GW of pumped storage capacity is installed. The utilisation of PSP strongly correlates with the amount of conventional generation capacity, rather than with topographical options. (orig.)

  17. Pumped storage power stations. Overview of new projects in Austria

    Energy Technology Data Exchange (ETDEWEB)

    Berger, G. [KELAG-Kaerntner Elektrizitaets-Aktiengesellschaft, Klagenfurt (Austria). Production Div.; Puerer, E. [Vorarlberger Illwerke AG, Schruns (Austria). Engineering Div.

    2008-07-01

    New framework conditions, due to the liberalisation of the electricity market and the development of renewable energy, especially wind energy with its stochastic production, led to a renaissance of pump storage technology in central Europe. Austria is lucky, first of all in providing natural water resources as well as in topography highly suitable for hydro power plants. Pump storage power plants represent even today an essential asset of the Austrian energy production. A boom for the planning and the construction of new power plants can be also observed. Currently there are pump storage power plants with a total capacity of approximately 1.100 MW under construction as well as others of approximately 1.200 MW in the stage of concrete planning. (orig.)

  18. Economic Viability of Pumped-Storage Power Plants Equipped with Ternary Units and Considering Hydraulic Short-Circuit Operation

    Science.gov (United States)

    Chazarra, Manuel; Pérez-Díaz, Juan I.; García-González, Javier

    2017-04-01

    This paper analyses the economic viability of pumped-storage hydropower plants equipped with ternary units and considering hydraulic short-circuit operation. The analysed plant is assumed to participate in the day-ahead energy market and in the secondary regulation service of the Spanish power system. A deterministic day-ahead energy and reserve scheduling model is used to estimate the maximum theoretical income of the plant assuming perfect information of the next day prices and the residual demand curves of the secondary regulation reserve market. Results show that the pay-back periods with and without the hydraulic short-circuit operation are significantly lower than their expected lifetime and that the pay-back periods can be reduced with the inclusion of the hydraulic short-circuit operation.

  19. Continuous on-line calculation of permissible load change in a pumped storage power plant; Kontinuierliche On-Line Berechnung der zulaessigen Lastaenderung in einem Pumpspeicherwerk

    Energy Technology Data Exchange (ETDEWEB)

    Feyrer, R.

    1994-12-31

    A preliminary simulator establishes the maximum possible load change in a pumped storage power plant. The complex hydraulic system of such power plants renders controlling of their operation difficult. The preliminary simulator continuously determines the maximum permissible turbine output and number of pumps at each instance, thereby facilitating power plant operation control. This simulator is installed at the Witznau power plant and is currently undergoing intense testing. It will be integrated into the new process control system installed in 1994. (orig.) [Deutsch] Der Vorabsimulator ermittelt die maximal moegliche Lastaenderung in einem Pumpspeicherwerk. Das komplizierte Wasserfuehrungsystem des Pumpspeicherwerks erschwert die Betriebsfuehrung. Der Vorabsimulator bestimmt kontinuierlich die momentan maximal zulaessige Turbinenleistung und Pumpenanzahl, und erleichtert damit die Betriebsfuehrung des Kraftwerks. Der Vorabsimulator ist im Kraftwerk Witznau installiert und wird derzeit intensiv getestet. Eine Einbindung in die neue Leittechnik, die 1994 installiert wird, ist vorgesehen. (orig.)

  20. Deriving Optimal End of Day Storage for Pumped-Storage Power Plants in the Joint Energy and Reserve Day-Ahead Scheduling

    Directory of Open Access Journals (Sweden)

    Manuel Chazarra

    2017-06-01

    Full Text Available This paper presents a new methodology to maximise the income and derive the optimal end of day storage of closed-loop and daily-cycle pumped-storage hydropower plants. The plants participate in the day-ahead energy market as a price-taker and in the secondary regulation reserve market as a price-maker, in the context of the Iberian electricity system. The real-time use of the committed reserves is considered in the model formulation. The operation of the plants with the proposed methodology is compared to the ones that use an end of day storage of an empty reservoir or half of the storage capacity. Results show that the proposed methodology increases the maximum theoretical income in all the plants analysed both if they only participate in the day-ahead energy market and if they also participate in the secondary regulation service. It is also shown that the increase in the maximum theoretical income strongly depends on the size of the plant. In addition, it is proven that the end of day storages change notably in the new reserve-driven strategies of pumped-storage hydropower plants and that the proposed methodology is even more recommended if the secondary regulation service is considered.

  1. Preliminary design study of Underground Pumped Hydro and compressed-air energy storage in hard rock. Volume 8: Design approaches. UPH, Appendix D: Power plant

    Science.gov (United States)

    1981-06-01

    Studies were undertaken to determine power plant arrangements for a single stage reversible pump turbine two step underground pumped hydro (UPH) installation and for a multi-stage reversible pump turbine single step (MSRPT) UPH installation. Arrangements consist of: the underground powerhouses; transformer galleries; associated mechanical and electrical equipment; the administration and control building; hoist head frames; the access; draft tube and bus tunnels; and the switchyard. Primary considerations including the number and size of pump turbine and motor generator units, starting methods, transformers, high voltage connections, geotechnical and construction aspects and safety were studied. A feasibility analysis to minimize costs was conducted. The study led to the selection of suitable equipment and layouts for the powerhouses, transformer galleries, and associated facilities. The material presented and also the cost estimates are based on the requirements for a 2000 MW plant providing 20,000 MWh of storage with a nominal head of 4600 ft.

  2. Technical development of electric power storage system. New technological development of pumped hydroelectric power plant by Mitsubishi Heavy Industries

    Energy Technology Data Exchange (ETDEWEB)

    1988-07-01

    This report introduces the outline of the superhigh head (700-800 m) pumping water wheel and variable pumped hydroelectric power system. Due to the superheightening of head, the influence of the head loss generated in each water flowing portion to the efficiency is more severe than that of the pumping water wheel so far used. To improve it, a computorized analysis being made with high accuracy, the simplification of model testing was planned. As regards the problem of axial vibration, it was confirmed that the axial vibration calculation, using the horizontal exciting force secured by the model testing, is effective, as its result, for the prediction of axial vibration. In order to isolate the runner from the vibration, the FEM analysis facilitated the obtainment with accuracy of the characteristic frequency of runner. For the purpose of frequency control (AFC) of the electric power system, variable low frequency electric current being flown on the rotor's side, the adoption of cyclo-inverter to control the rotative velocity enabled the superheightening of efficiency and widening of operational range, particularly in case of partially loaded operation, and the generation control of cavitation and vibration. (11 figs)

  3. Overall control and monitoring systems for pumped storage plants

    Energy Technology Data Exchange (ETDEWEB)

    Stepinski, B.; Cvetko, H.

    1982-06-01

    The article describes control and monitoring concepts in which the delegation of responsibility is becoming more decisive than ever (automation hierarchy), and which are capable of optimized, automatic control of process events in pumped storage plants. 8 refs.

  4. Underground pumped hydroelectric storage

    Science.gov (United States)

    Allen, R. D.; Doherty, T. J.; Kannberg, L. D.

    1984-07-01

    Underground pumped hydroelectric energy storage was conceived as a modification of surface pumped storage to eliminate dependence upon fortuitous topography, provide higher hydraulic heads, and reduce environmental concerns. A UPHS plant offers substantial savings in investment cost over coal-fired cycling plants and savings in system production costs over gas turbines. Potential location near load centers lowers transmission costs and line losses. Environmental impact is less than that for a coal-fired cycling plant. The inherent benefits include those of all pumped storage (i.e., rapid load response, emergency capacity, improvement in efficiency as pumps improve, and capacity for voltage regulation). A UPHS plant would be powered by either a coal-fired or nuclear baseload plant. The economic capacity of a UPHS plant would be in the range of 1000 to 3000 MW. This storage level is compatible with the load-velocity requirements of a greater metropolitan area with population of 1 million or more.

  5. The Presentation of a Two Stages Model for an Optimum Operation of a Hybrid System of Wind-Pumped Storage Power Plant in the Power Market Environment

    Directory of Open Access Journals (Sweden)

    Mehdi Akbarpour

    2012-11-01

    Full Text Available In this study we present a new method in power market environment. One of the weaknesses in the utilization of wind units is severe dependence of output power level on wind. However, considering the high uncertainty in the prediction of wind speed and wind forecast unit production capacity is also having an error. Also, regarding to the uncontrollable generators of this type, it is better to use combined systems for utilization. This study presents a new model based on the a two stage for an optimum operation of a hybrid system of windpumped storage power plant in the power market environment that causes to provide a successful presentation condition in market environments for the producers of wind power. In the suggestive hybrid system of windpumped storage power plant of this study the modeling is done in two stages for the optimum presence in power market environment with the a most possible benefit. At first, the suggestive model is optimized regarding to uncertainty in the prediction of power price and producing the wind power, for presenting the suggestion of power to market, in order to gain the most benefit. At the second stage, the suggestive model is optimized regarding to uncertainty in producing wind power, in order to gain the most benefit and paying the least penalty for unbalancing in market for operation of the system. In this study, the Particle Swarm Optimization algorithm (PSO is used for optimization. At the end of a model example for applying the results of the proposed model will be examined and analyzes the results. Results show that the model is an appropriate method for the operation of this combined system in market environment.

  6. Nuclear power plant safety related pump issues

    Energy Technology Data Exchange (ETDEWEB)

    Colaccino, J.

    1996-12-01

    This paper summarizes of a number of pump issues raised since the Third NRC/ASME Symposium on Valve and Pump Testing in 1994. General issues discussed include revision of NRC Inspection Procedure 73756, issuance of NRC Information Notice 95-08 on ultrasonic flow meter uncertainties, relief requests for tests that are determined by the licensee to be impractical, and items in the ASME OM-1995 Code, Subsection ISTB, for pumps. The paper also discusses current pump vibration issues encountered in relief requests and plant inspections - which include smooth running pumps, absolute vibration limits, and vertical centrifugal pump vibration measurement requirements. Two pump scope issues involving boiling water reactor waterlog and reactor core isolation cooling pumps are also discussed. Where appropriate, NRC guidance is discussed.

  7. Research on the function orientation of pumped-storage plant in China

    Science.gov (United States)

    Feng, Jun-shu; Bo, Yuan; Wu, Sheng-yu; Zhang, Fu-qiang; Hao, Wei-hua

    2017-01-01

    With the growth of electrical load and development of clean energy, peak regulation of power system has been paid more attention to, in which case pumped-storage plant becomes the most efficient and economical way against peak load and the ensurance of safe and stable system operation. However, the dispatch and operation mode of pumped-storage plant is a little unreasonable at present in our country, due to the insufficient acknowledge of plants’ function orientation in different regions. This paper studied the standard of classifying pumped-storage plants, by dividing the plant function into three types security oriented, peak shaving oriented and renewable energy accommodation oriented, based on the local load characteristic, structure of power supply, accommodating capability of renewable energy, nuclear energy, etc. Finally, according to the current and future development situation of five Chinese regions, the function orientation partition of pumped-storage plant is given, which has profound guiding and practical significance for pumped-storage plant dispatch and operation.

  8. On the Profitability of Variable Speed Pump-Storage-Power in Frequency Restoration Reserve

    Science.gov (United States)

    Filipe, Jorge; Bessa, Ricardo; Moreira, Carlos; Silva, Bernardo

    2017-04-01

    The increase penetration of renewable energy sources (RES) into the European power system has introduced a significant amount of variability and uncertainty in the generation profiles raising the needs for ancillary services as well as other tools like demand response, improved generation forecasting techniques and changes to the market design. While RES is able to replace energy produced by the traditional centralized generation, it cannot displace its capacity in terms of ancillary services provided. Therefore, centralized generation capacity must be retained to perform this function leading to over-capacity issues and underutilisation of the assets. Large-scale reversible hydro power plants represent the majority of the storage solution installed in the power system. This technology comes with high investments costs, hence the constant search for methods to increase and diversify the sources of revenue. Traditional fixed speed pump storage units typically operate in the day-ahead market to perform price arbitrage and, in some specific cases, provide downward replacement reserve (RR). Variable speed pump storage can not only participate in RR but also contribute to FRR, given their ability to control its operating point in pumping mode. This work does an extended analysis of a complete bidding strategy for Pumped Storage Power, enhancing the economic advantages of variable speed pump units in comparison with fixed ones.

  9. Pump power plants for wind age; Pumpekraftverk for vindalderen

    Energy Technology Data Exchange (ETDEWEB)

    Bakken, Marte

    2010-07-01

    Power giant Sira-Kvina, Norway, prepares to expand Tonstad power station with pump options to save energy and benefit from price fluctuations in the electricity market. How pump power plant works; Consists mainly of two reservoirs at different heights. Bottom placed a turbine that can run both ways, or a pump and turbine mounted on the generator. The generator acts as an engine of pumping. When saving energy, water is pumped up to the highest magazine. The energy is extracted by letting the water run back through the turbine. Amount of energy that can be saved depends on the height difference between the magazines and magazine size, while the effect is determined by the size of the pump turbine.(AG)

  10. Potential study for pump storage plants in Baden-Wuerttemberg; Potenzialstudie fuer Pumpspeicherkraftwerke in Baden-Wuerttemberg

    Energy Technology Data Exchange (ETDEWEB)

    Berger, Claudia [EnBW Kraftwerke AG, Stuttgart (Germany); Sauer, Nikolaus [EnBW Holding AG, Karlsruhe (Germany); Achatz, Robert [HPI Hydroprojekt Ingenieurgesellschaft mbH, Muenchen (Germany)

    2013-06-01

    Power of renewable energies is increasingly produced by fluctuated energy sources like wind or solar. To replace the current electricity of mostly nuclear power and coal fired plants, there is a need of storage possibilities in times of low demand. In times of high demand the electricity could be delivered directly by turbines. Today only one technology cope with this economically and commercially: pump storage plants. They operate like big batteries in the grid and can protect grid stability. (orig.)

  11. A Joint Daily Operational Optimization Model for Wind Power and Pumped-storage Plant%风电-抽水蓄能联合日运行优化调度模型

    Institute of Scientific and Technical Information of China (English)

    胡泽春; 丁华杰; 孔涛

    2012-01-01

    基于日前负荷预测和风电出力预测,研究了风电一抽水蓄能联合日运行的优化方法,提出了电网消纳风电出力的新模式。以风电一抽水蓄能联合运行的效益最大化为目标,考虑抽水蓄能机组的启停限制和发电一抽水工况转换限制,以二次约束表征机组启停约束和抽水蓄能电站运行工况约束,建立了含全天96个时段的混合整数规划模型,并采用商业优化软件求解。基于实际抽水蓄能电站参数设计了算例系统。测试结果表明,抽水蓄能电站与风电场配合可大大降低风电出力随机性对电网运行的负面影响,经济和社会效益显著。%Based on the day-ahead forecast of system load and wind power output, this paper focuses on the optimization of the daily joint operation of wind power and pumped-storage plants, and a new mode of joint operation is proposed. A mixed-integer programming formulation is built to maximize the daily profit of the wind farm and the pumped-storage plant, where the time interval is 15 minutes and the constraints of unit startup-shutdown times are considered. The state change of units is taken into consideration by a quadratic constraint. The whole formulation is solved by commercial optimization software under MATLAB environment. A test case is developed based on the parameters of a practical pumped-storage plant. Simulation results indicate that the coordinated operation of wind farm and pumped-storage plant greatly reduces the negative impact of random wind power output on the power system operation and achieve significant economic and social benefits.

  12. A Feasibility Study of Solar Thermal Power Generation as the Pumping Power Source for Pumped Storage in Indonesia

    Science.gov (United States)

    Funatsu, Tetsuya; Natsume, Hiroaki

    A pumped storage hydroelectric generation (PSHG) has been studied as alternative peak power source of the oil-fired power generation in Indonesia. However, because there is no surplus base load electricity even in the night, the economic advantage can not be found. The possibility of solar thermal power generation (STPG) is investigated to restrain the increase of fuel consumption by the existing peak power source. The optimum system simulation and the analysis of economy and environmental impact by a multiobjective optimization method provide the following results. The optimum aperture area and thermal storage capacity of STPG are found by the simulation based on the climate and the solar condition in West Java. PSHG with STPG as the power source of storage pump shows lower generation cost and CO2 emission than PSHG with existing oil fired peak power sources. Even if the fuel switch from oil to gas is supposed in future, PSHG with STPG will achieve the lower generation cost and CO2 emission than PSHG with the oil/gas fired combined cycle by sharing the peak electricity supply with the oil/gas fired combined cycle in an appropriate ratio. Furthermore, if the crude oil price hike in future is considered, PSHG with STPG may be the optimal solution for the peak electricity supply of Java-Bari grid.

  13. Study on the Construction Scale of Pumped-Storage Hydropower in Northeast Power Grid

    Institute of Scientific and Technical Information of China (English)

    Wang Nan; Bai Jianhua; Li You; Gu Xiaoguang; Li Chunshan

    2007-01-01

    @@ Peak regulation in the Northeast power grid is going from bad to worse. This stimulates the need to pumped-storage hydropower for its role in this respect. Based on the status of power sources and the load forecast in the system, the author puts forward a minimum construction scale of pumped-storage stations by the end of 2020 from technical feasibility, and an economic scale from economy. The analysis and comparison on the two schemes can be regarded as a reference for reasonably planning pumped-storage stations in the northeastern part of China.

  14. Wind power integration with heat pumps, heat storages, and electric vehicles - Energy systems analysis and modelling

    Energy Technology Data Exchange (ETDEWEB)

    Hedegaard, K.

    2013-09-15

    Denmark by about 300-600 MW, corresponding to the size of a large power plant. This can be achieved when investing in socio-economically feasible heat storages complementing the heat pumps. The potential for reducing the required investments in peak/reserve capacities is crucial for the feasibility of the heat storages. Intelligent heat storage in the building structure is identified as socio-economically feasible in 20-75 % of the houses with heat pump installations, depending on the cost of control equipment in particular. Investment in control equipment, enabling utilisation of existing hot water tanks for flexible heat pump operation, is found socio-economically feasible in about 20-70 % of the houses. In contrast, heat accumulation tanks are not competitive, due to their higher investments costs. Further analyses investigate the system effects of a gradual large-scale implementation of battery electric vehicles (BEVs) and plug-in hybrid electric vehicles (PHEVs) in Denmark, Finland, Norway, Sweden, and Germany towards 2030. When charged/discharged intelligently, the electric vehicles can, in the long term, facilitate larger wind power investments, while they in the short term in many cases are likely to result in increased coal-based electricity generation. The electric vehicles can contribute significantly to reducing CO{sub 2} emissions, while system costs are generally increased, due to assumed investments in the costly BEVs. The need for peak/reserve capacities can be reduced through the use of vehicle-to-grid capability. Competing flexibility measures, such as large heat pumps, electric boilers, and thermal storages in the district heating system, have also been included in the energy systems analyses. These technologies can together facilitate increased wind power investments and reduce CO{sub 2} emissions in the same order of magnitude as a large-scale implementation of electric vehicles. Overall, it is concluded that individual heat pumps, flexibility

  15. A comparison of pump storage technologies; Pumpspeichertechnologien im Vergleich

    Energy Technology Data Exchange (ETDEWEB)

    Albrecht, Joerg-Peter [Voith Hydro GmbH und Co. KG, Heidenheim (Germany)

    2012-07-01

    According to the current state of art pumped storage power plants are the only reliable, economically viable and ecologically sound storage option for electric power. The different technical solutions, the best possible applications and latest research results for pumped storage power plants are presented in this paper. There are numerous potentia Is for the construction of pumped storage power stations worldwide. In Europe, where this technology to generate electricity from hydro power is used for a long time, new sites exist primarily with special technical requirements. Existing pumped storage power plants are up for modernization, to increase power and partly for expansion. The need for reliable electricity storage through pumped storage power plants is high. The willingness to invest in expansion however has, because of the economic conditions, the low difference in price between base load and peak load supply, deteriorated significantly in the meantime. (orig.)

  16. A Day-Ahead Dispatching Strategy for Power Pool Composed of Wind Farms, Photovoltaic Generations, Pumped-Storage Power Stations, Gas Turbine Power Plants and Energy Storage Systems Based on Multi Frequency Scale Analysis%基于功率多频率尺度分析的风光水气储联合系统日前调度策略

    Institute of Scientific and Technical Information of China (English)

    马静; 石建磊; 李文泉; 王增平

    2013-01-01

    Based on multi frequency scale analysis on power output of wind farms and photovoltaic (PV) generation (PWP), a day-ahead dispatching strategy for power pool composed of wind farms, photovoltaic generations, pumped-storage power stations, gas turbine power plants and energy storage systems is proposed. Firstly, according to the control objectives the filter analysis on PWP is performed to extract PWP components corresponding to different frequency scales to draft output schedulings for of all kinds of complementary power generations in the power pool; then using improved particle swamp optimization (PSO) the total power output of the power pool is computed;finally, based on different day-ahead dispatching modes and considering stability and wind power accommodation capability of the power pool, the per-unit generation costs of wind farms, photovoltaic generations, pumped-storage power stations, gas turbine power plants and energy storage systems are optimized to draft final output schedulings. Results of calculation example show that comparing with traditional optimization models and optimization algorithms, the proposed method can cope with the power fluctuation due to grid-connection of large-scale wind farms and PV generations to implement stationary power output of the power pool, meanwhile the economy, efficiency, low-carbon operation and environmental protection of the power pool can be ensured.%  提出一种基于功率多频率尺度分析的风光水气储联合系统日前调度策略。该策略首先根据控制目标对风光出力(power of wind photovoltaic,PWP)进行滤波分析,提取不同频率尺度下的PWP分量,制定各类补偿电站出力计划;然后利用改进粒子群优化算法并行优化各电站内部综合成本,计算联合系统总体输出功率;最后依据不同日前调度模式,考虑稳定性和风光消纳能力,优化风光水气储系统单位发电成本,制定出力计划。算例分析结果

  17. Using Heat Pump Energy Storages in the Power Grid

    DEFF Research Database (Denmark)

    Pedersen, Tom S.; Andersen, Palle; Nielsen, Kirsten M.

    2011-01-01

    The extensive growth of installed wind energy plants lead to increasing balancing problems in the power grid due to the nature of wind fields and diurnal variations in consumption. One way to overcome these problems is to move consumption to times where wind power otherwise cause overproduction...

  18. 西北地区发展抽水蓄能电站的意义与面临的主要问题%Signif icance and Issues of Pumped Storage Power Plants to be Developed in West China

    Institute of Scientific and Technical Information of China (English)

    冯黎; 王社亮

    2014-01-01

    西北地区是中国规划的千万千瓦级风电及光电基地之一,促进西北地区风能与太阳能开发利用对实现中国能源发展战略具有重要的意义。而配置抽水蓄能电站是增强电网接纳风电光电能力的重要措施。文章介绍了西北地区风能、太阳能资源发展规划,分析了风电与光电并网存在的主要问题及抽水蓄能电站对促进风电与光电消纳的重要作用,并针对目前西北地区抽水蓄能电站发展过程中存在的主要问题,提出了促进措施和建议。%West China is one of the wind-solar energy bases with the installed capacity of exceeding tens of thousands of megawatt planned in China.It is significant for the energy development strategy of China to promote the development and utilization of the wind-solar energy in west China.But, the introduction of the pumped storage power plant into the grid is the important measures to enhance the grid capaci-ty of accepting the wind-solar power.In the paper, the development plan for the wind-solar energy in west China is introduced;major is-sues on the wind-solar power into the grid as well as the significance of the pumped storagepower plant for the promotion of the accept-ance and consumption of the wind-solar power are analyzed.Furthermore, the promoting measures and suggestions are raised aiming at the major issues in the development of the pumped storage power plant in west China.

  19. Wind power integration using individual heat pumps – Analysis of different heat storage options

    DEFF Research Database (Denmark)

    Hedegaard, Karsten; Mathiesen, Brian Vad; Lund, Henrik

    2012-01-01

    Significant installations of individual heat pumps are expected in future energy systems due to their economic competitiveness. This case study of the Danish energy system in 2020 with 50% wind power shows that individual heat pumps and heat storages can contribute to the integration of wind power...... reductions in excess electricity production and fuel consumption than heat accumulation tanks. Moreover, passive heat storage is found to be significantly more cost-effective than heat accumulation tanks. In terms of reducing fuel consumption of the energy system, the installation of heat pumps is the most...... important step. Adding heat storages only moderately reduces the fuel consumption. Model development has been made to facilitate a technical optimisation of individual heat pumps and heat storages in integration with the energy system....

  20. Assessment of high-head turbomachinery for underground pumped hydroelectric storage plants

    Science.gov (United States)

    Tam, S. W.; Frigo, A. A.; Blomquist, C. A.

    Underground pumped hydroelectric storage (UPHS) plants equipped with advanced reversible pump turbines for operating heads from 500 to 1500 m are discussed in terms of cost efficiency. It is found that the use of advanced machinery shifts the minimum UPHS plant cost to the head range 1200-1500 m. The interactive effects of pump-turbine efficiencies and charge/discharge ratios are examined. It is shown that under certain conditions, a pump-turbine option with a higher charge-discharge ratio at the expense of somewhat lower operating efficiency may be desirable.

  1. Using Heat Pump Energy Storages in the Power Grid

    DEFF Research Database (Denmark)

    Pedersen, Tom S.; Andersen, Palle; Nielsen, Kirsten M.

    2011-01-01

    consumption without compromising the comfort of house residents. In the paper an optimization exploiting forecasts of weather and energy prices combined with prediction models of house dynamics is presented. The results show that with the presented method it will be possible to move a substantial amount......The extensive growth of installed wind energy plants lead to increasing balancing problems in the power grid due to the nature of wind fields and diurnal variations in consumption. One way to overcome these problems is to move consumption to times where wind power otherwise cause overproduction...

  2. Aging management guideline for commercial nuclear power plants-pumps

    Energy Technology Data Exchange (ETDEWEB)

    Booker, S.; Katz, D.; Daavettila, N.; Lehnert, D. [MDC-Ogden Environmental and Energy Services, Southfield, MI (United States)

    1994-03-01

    This Aging Management Guideline (AMG) describes recommended methods for effective detection and mitigation of age-related degradation mechanisms in BWR and PWR commercial nuclear power plant pumps important to license renewal. The intent of this AMG is to assist plant maintenance and operations personnel in maximizing the safe, useful life of these components. It also supports the documentation of effective aging management programs required under the License Renewal Rule 10 CFR Part 54. This AMG is presented in a manner that allows personnel responsible for performance analysis and maintenance to compare their plant-specific aging mechanisms (expected or already experienced) and aging management program activities to the more generic results and recommendations presented herein.

  3. Power system stabilising features from wind power plants augmented with energy storage

    DEFF Research Database (Denmark)

    Tarnowski, Germán C.; Kjær, Philip C; Lærke, Rasmus

    2014-01-01

    This paper describes a wind power plant augmented with energy storage, configured to provide ancillary services (primary reserve, inertial response, power oscillation damping) for enhancement of power system stability. Energy storage can complement wind power plants thus reducing the need for any...

  4. Research on Mechanism and Model of Centralized Bidding for Pumped Storage Power in Shanghai

    Science.gov (United States)

    Hua, Zhong; Ying, Zhiwei; Lv, Zhengyu; Jianlin, Yang; Huang, Yupeng; Li, Dong

    2017-05-01

    China is now in the transition stage toward power market and in some specific area, market approach has already been adopted to improve the overall efficiency. In this paper, Bidding and trading modes of pumped storage energy in various regions of China are analysed. Based on the constraints of bidding price and electricity, as well as the system power flow, the trading model is established to collect the capacity cost of pumped storage energy in Shanghai. With the trading model proposed, that the generators who actively undertake the capacity cost of pumped storage energy and bid enough electricity with lower price can be rewarded, while those attempts to conspire and manipulate the market will be penalized. Finally, using seven generators in Shanghai as examples to simulate the market operation, the effectiveness of the proposed model is verified.

  5. Experimental Research and Control Strategy of Pumped Storage Units Dispatching in the Taiwan Power System Considering Transmission Line Limits

    Directory of Open Access Journals (Sweden)

    Ming-Tse Kuo

    2013-07-01

    Full Text Available Taiwan’s power system is isolated and not supported by other interconnected systems. Consequently, the system frequency immediately reflects changes in the system loads. Pumped storage units are crucial for controlling power frequency. These units provide main or auxiliary capacities, reducing the allocation of frequency-regulating reserve (FRR and further reducing generation costs in system operations. Taiwan’s Longmen Nuclear Power Plant is set to be converted for commercial operations, which will significantly alter the spinning reserves in the power system. Thus, this study proposes a safe and economic pumped storage unit dispatch strategy. This strategy is used to determine the optimal FRR capacity and 1-min recovery frequency in a generator failure occurrence at the Longmen Power Plant. In addition, this study considered transmission capacity constraints and conducted power flow analysis of the power systems in Northern, Central, and Southern Taiwan. The results indicated that, in the event of a failure at Longmen Power Plant, the proposed strategy can not only recover the system frequency to an acceptable range to prevent underfrequency load-shedding, but can also mitigate transmission line overloading.

  6. Water chemical evolution in Underground Pumped Storage Hydropower plants and induced consequences

    Science.gov (United States)

    Pujades, Estanislao; Orban, Philippe; Jurado, Anna; Ayora, Carlos; Brouyère, Serge; Dassargues, Alain

    2017-04-01

    Underground Pumped Storage Hydropower (UPSH) using abandoned mines is an alternative to manage the electricity production in flat regions. UPSH plants consist of two reservoirs; the upper reservoir is located at the surface or at shallow depth, while the lower reservoir is underground. These plants have potentially less constraints that the classical Pumped Storage Hydropower plants because more sites are available and impacts on landscape, land use, environment and society seem lower. Still, it is needed to consider the consequences of the groundwater exchanges occurring between the underground reservoir and surrounding porous media. Previous studies have been focused on the influence of these groundwater exchanges on the efficiency and on groundwater flow impacts. However, hydrochemical variations induced by the surface exposure of pumped water and their consequences have not been yet addressed. The objective of this work is to evaluate the hydrochemical evolution of the water in UPSH plants and its effects on the environment and on the UPSH efficiency. The problem is studied numerically by means of reactive transport modelling. Different scenarios are considered varying the chemical properties of the surrounding porous medium and groundwater. Results show that the dissolution and/or precipitation of some compounds may affect (1) the groundwater quality, and (2) the efficiency and the useful life of the used pumps and turbines of the UPSH system.

  7. Seawater pump study: Ocean Thermal Energy Conversion Program. Final report. [For ocean thermal power plants

    Energy Technology Data Exchange (ETDEWEB)

    Little, T.E.

    1978-01-01

    The pumping power required to move cold seawater and warm seawater through an Ocean Thermal Energy Conversion (OTEC) power plant is a significant portion of the plant power output; therefore, seawater pump performance, sizing, and cost information are very influential inputs into any power plant system design optimizations. The analysis and evaluation of large seawater pumping systems selected specifically for the OTEC application are provided with a view toward judging the impact of pump selection on overall OTEC power plant performance. A self-contained bulb, direct drive, axial flow pump was found to have a distinct advantage in performance and arrangement flexibility. A design of a pump operating at a net total head rise of 3.5 meters and a flow capacity of 100 m/sup 3//s is presented including pump blade geometry (profiles), pump diffuser geometry, and pump/diffuser configuration and performance. Results are presented in terms of the geometric and power requirements of several related pump designs over a range of seawater capacity from 25 m/sup 3//s to 100 m/sup 3//s. Summary analysis and evaluations include pump design weights and cost estimates.

  8. Optimization and Design of Ecological Bottom Outlet of Lower Reservoir, Cisokon Pumped Storage Power Plant%印尼西索肯抽水蓄能电站下水库生态底孔的优化与设计

    Institute of Scientific and Technical Information of China (English)

    2015-01-01

    The lower reservoir of Cisokon Pumped Storage Power Plant consists of RCC gravity dam, overflow surface outlet and bottom outlet.The bottom outlet is to release water downstream for ecology, irrigation and reservoir water reduction when the reservoir impounds and operates normally.In the original design of the bottom outlet, the potential risks of gate plugging not closed tightly may exist.There-fore, the alternative scheme is compared and argued.The design scheme of enlarging the shaft section at inlet and providing gate slot is proposed.Additionally, the bottom outlet and the lower installed capacity station are integrated to fully utilize the ecological flow for more power generation.This optimization results in outstanding economic benefit.%印尼西索肯抽水蓄能电站的下水库由碾压混凝土重力坝、溢流表孔和底孔组成;底孔的功能是在水库蓄水和正常运行时,为下游提供生态供水、灌溉流量和降低库水位。原底孔设计方案存在下闸封堵不落实等问题,故对其进行了替代方案的比较和论证;推荐采用加大进口竖井断面、增设闸门槽的设计方案。另外,为充分利用生态流量多发电,最终将底孔与小电站结合起来,经济效益明显。

  9. Pumpspeicherbecken im Karstgrundwasserleiter des Weißen Jura der Schwäbischen Alb. Erste Ergebnisse aus der geologischen und hydrogeologischen Erkundung für die Planfeststellung Pumped-storage hydroelectric power plant in the Jurassic karst aquifer of the swabian alb, Germany

    Science.gov (United States)

    Neukum, Christoph; Köhler, Hans Joachim; Fernandez-Steeger, Tomas; Hennings, Sibylle; Azzam, Rafig

    2014-06-01

    Extensive geological and hydrogeological investigations have been undertaken for the planned pumped-storage hydroelectric power plant in "Blautal" (Swabian Alb, Germany) in order to characterise the Jurassic karst aquifer in which the lower reservoir will be constructed. The preferred option for the plant setup is to integrate the lower reservoir into the groundwater without sealing. Therefore, in order to reliably predict the impact of the pumped storage plant operations on the surrounding drinking water wells and groundwater dependent ecosystems, a comprehensive database has been developed to assess the hydraulic conditions of the karst aquifer. A large scale geological site investigation was carried out to characterise the rock mass and extensive hydraulic tests were performed in many boreholes. The results of the hydraulic characterisation were then implemented in a three dimensional flow model. In this paper, the first results of the geological and hydrogeological investigations are presented and discussed.

  10. Project risk control of underground engineering geological disaster in pumped-storage power station

    Institute of Scientific and Technical Information of China (English)

    Luo Shaoji

    2014-01-01

    This paper introduced the construction of the pumped-storage power station (PSPS). In the excava- tion of underground power house, the principle of excavation in thin layer and support in time with real time monitoring are adopted. The excavation blasting parameters are adjusted timely. Through these, the excavation quality can be guaranteed, the surrounding rock can be prevented from being damaged and the deformation of power house side wall can be controlled. Five security defense lines have been adopted to solve anti-seepage and drainage in the major underground projects.

  11. Project risk control of underground engineering geological disaster in pumped-storage power station

    Institute of Scientific and Technical Information of China (English)

    Luo Shaoji

    2014-01-01

    This paper introduced the construction of the pumped-storage power station (PSPS). In the excava-tion of underground power house,the principle of excavation in thin layer and support in time with real time monitoring are adopted. The excavation blasting parameters are adjusted timely. Through these,the excavation quality can be guaranteed,the surrounding rock can be prevented from being damaged and the deformation of power house side wall can be controlled. Five security defense lines have been adopted to solve anti-seepage and drainage in the major underground projects.

  12. Contribution of variable-speed pump hydro storage for power system dynamic performance

    Science.gov (United States)

    Silva, B.; Moreira, C.

    2017-04-01

    This paper presents the study of variable-speed Pump Storage Powerplant (PSP) in the Portuguese power system. It evaluates the progressive integration in three major locations and compares the power system performance following a severe fault event with consequent disconnection of non-Fault Ride-through (FRT) compliant Wind Farms (WF). To achieve such objective, a frequency responsive model was developed in PSS/E and was further used to substitute existing fixed-speed PSP. The results allow identifying a clear enhancement on the power system performance by the presence of frequency responsive variable-speed PSP, especially for the scenario presented, with high level of renewables integration.

  13. Pumped storage hydropower plants in tomorrow's energy mix. A legal classification; Pumpspeicherkraftwerke im Energiemix der Zukunft. Eine rechtliche Einordnung

    Energy Technology Data Exchange (ETDEWEB)

    Bachmann, Peter; Erling, Uwe M. [Noerr LLP, Muenchen (Germany)

    2012-06-15

    The continuing expansion of renewable energies has brought storage technologies into the focus of interest, since these are indispensable if the demand for energy is to be covered solely from volatile resources. Pumped storage hydropower plants are predestined for this task because they can be deployed in a targeted, flexible manner without interruptions of operation. A legal assessment of these power plants with regard to recent developments shows in particular that the investment incentives created to date deserve a critical view.

  14. Optimization of the weekly operation of a multipurpose hydroelectric development, including a pumped storage plant

    Energy Technology Data Exchange (ETDEWEB)

    Popa, R; Popa, B [Faculty of Power Engineering, University Politehnica of Bucharest, 313 Spl. Independentei, sect. 6, Bucharest, 060042 (Romania); Popa, F [Institute for Hydropower Studies and Design, 5-7 Vasile Lascar, sect. 2, Bucharest, 020491 (Romania); Zachia-Zlatea, D, E-mail: bogdan.popa@rosha.r [Hidroelectrica S.A., 3 Constantin Nacu, sect. 2, Bucharest, 020995 (Romania)

    2010-08-15

    It is presented an optimization model based on genetic algorithms for the operation of a multipurpose hydroelectric power development consisting in a pumped storage plant (PSP) with weekly operation cycle. The lower reservoir of the PSP is supplied upstream from a peak hydropower plant (HPP) with a large reservoir and supplies the own HPP which provides the required discharges towards downstream. Under these conditions, the optimum operation of the assembly consisting in 3 reservoirs and hydropower plants becomes a difficult problem if there are considered the restrictions as regards: the gradients allowed for the reservoirs filling/emptying, compliance with of a long-term policy of the upper reservoir from the hydroelectric development and of the weekly cycle for the PSP upper reservoir, correspondence between the power output/consumption in the weekly load schedule, turning to account of the water resource at maximum overall efficiencies, etc. Maximization of the net energy value (generated minus consumed) was selected as performance function of the model, considering the differentiated price of the electric energy over the week (working or weekend days, peak, half-peak or base hours). The analysis time step was required to be of 3 hours, resulting a weekly horizon of 56 steps and 168 decision variables, respectively, for the 3 HPPs of the system. These were allowed to be the flows turbined at the HPP and the number of working hydrounits at PSP, on each time step. The numerical application has considered the guiding data of Fantanele-Tarnita-Lapustesti hydroelectric development. Results of various simulations carried out proved the qualities of the proposed optimization model, which will allow its use within a decisional support program for such a development.

  15. Optimization of the weekly operation of a multipurpose hydroelectric development, including a pumped storage plant

    Science.gov (United States)

    Popa, R.; Popa, F.; Popa, B.; Zachia-Zlatea, D.

    2010-08-01

    It is presented an optimization model based on genetic algorithms for the operation of a multipurpose hydroelectric power development consisting in a pumped storage plant (PSP) with weekly operation cycle. The lower reservoir of the PSP is supplied upstream from a peak hydropower plant (HPP) with a large reservoir and supplies the own HPP which provides the required discharges towards downstream. Under these conditions, the optimum operation of the assembly consisting in 3 reservoirs and hydropower plants becomes a difficult problem if there are considered the restrictions as regards: the gradients allowed for the reservoirs filling/emptying, compliance with of a long-term policy of the upper reservoir from the hydroelectric development and of the weekly cycle for the PSP upper reservoir, correspondence between the power output/consumption in the weekly load schedule, turning to account of the water resource at maximum overall efficiencies, etc. Maximization of the net energy value (generated minus consumed) was selected as performance function of the model, considering the differentiated price of the electric energy over the week (working or weekend days, peak, half-peak or base hours). The analysis time step was required to be of 3 hours, resulting a weekly horizon of 56 steps and 168 decision variables, respectively, for the 3 HPPs of the system. These were allowed to be the flows turbined at the HPP and the number of working hydrounits at PSP, on each time step. The numerical application has considered the guiding data of Fantanele-Tarnita-Lapustesti hydroelectric development. Results of various simulations carried out proved the qualities of the proposed optimization model, which will allow its use within a decisional support program for such a development.

  16. Demanding pump power; Krevende pumpekraft

    Energy Technology Data Exchange (ETDEWEB)

    Lie, Oeyvind

    2011-07-01

    The potential for pump power in Norway is huge, but it is difficult to exploit it. Norway has some pumping plants, but these are built for seasonal pumping (pumping up to the magazine in the summer, and production in the winter). Pump power plants for short periods do not exist in Norway. (AG)

  17. Dynamic Modeling of Adjustable-Speed Pumped Storage Hydropower Plant: Preprint

    Energy Technology Data Exchange (ETDEWEB)

    Muljadi, E.; Singh, M.; Gevorgian, V.; Mohanpurkar, M.; Havsapian, R.; Koritarov, V.

    2015-04-06

    Hydropower is the largest producer of renewable energy in the U.S. More than 60% of the total renewable generation comes from hydropower. There is also approximately 22 GW of pumped storage hydropower (PSH). Conventional PSH uses a synchronous generator, and thus the rotational speed is constant at synchronous speed. This work details a hydrodynamic model and generator/power converter dynamic model. The optimization of the hydrodynamic model is executed by the hydro-turbine controller, and the electrical output real/reactive power is controlled by the power converter. All essential controllers to perform grid-interface functions and provide ancillary services are included in the model.

  18. Preliminary design study of underground pumped hydro and compressed-air energy storage in hard rock. Volume 11: Plant design. UPH

    Science.gov (United States)

    1981-06-01

    The plant design for an underground pumped hydroelectric (UPH) storage facility having maximum generating capacity of 2000 MW and energy storage capacity of 20,000 MWh at a nominal heat of 5000 ft. is presented. The UPH facility is a two step configuration with single-stage reversible pump-turbines, each step consisting of a 1000 MW plant at a nominal head of 2500 ft. The surface facilities and upper reservoir, shafts and hoists, penstocks and hydraulic tunnels, powerhouses, and intermediate and lower reservoirs are described. Details of the power plant electrical and mechanical equipment, including pump-turbine and motor-generator units, are given. The development of the site is outlined together with the construction methods and schedule. The cost estimates and a cost-risk analysis are presented. Plant operation, including unit operation, two-step operation, plant efficiency, and availability, is outlined.

  19. Isobaric gas and steam. Compressed air storage power plant with heat storage system; Isobares GuD. Druckluftspeicherkraftwerk mit Waermespeicher

    Energy Technology Data Exchange (ETDEWEB)

    Nielsen, Lasse; Leithner, Reinhard; Qi, Dawei [Technische Univ. Braunschweig (Germany). Inst. fuer Waerme- und Brennstofftechnik; Grote, Wolfgang; Kastsian, Darya; Moennigmann, Martin [Bochum Univ. (Germany). Lehrstuhl fuer Regelungstechnik und Systemtheorie

    2011-07-01

    The ISACOAST-CC (Isobaric Adiabatic Compressed Air Energy Storage - Combinde Cycle) is a innovative combination of combined cycle power plant, compressed air store and heat store. First calculations show that a storage efficiency of 80 % could be achieved.

  20. Wind power integration with heat pumps, heat storages, and electric vehicles – Energy systems analysis and modelling

    DEFF Research Database (Denmark)

    Hedegaard, Karsten

    The fluctuating and only partly predictable nature of wind challenges an effective integration of large wind power penetrations. This PhD thesis investigates to which extent heat pumps, heat storages, and electric vehicles can support the integration of wind power. Considering the gaps in existin...

  1. Stability analysis of the governor-turbine-hydraulic system of pumped storage plant during small load variation

    Science.gov (United States)

    Yu, X. D.; Zhang, J.; Chen, S.; Liu, J. C.

    2016-11-01

    Governor-turbine-hydraulic (GTH) system is complex because of strong couplings of hydraulic, mechanical and electrical system. This paper presents a convenient mathematical model of the GTH system of a pumped storage plant (PSP) during small load variation. By using state space method and eigenvalue method, the stability of the GTH system is analyzed and the stable regions of the system can be given as well, which would help to optimize system design or the turning of governors. The proposed method is used to analyze the stability of a practical pumped storage plant during small load variation, which is also simulated in time domain on the basis of characteristics method. The theoretical analysis is in good agreement with numerical simulations. Based on the proposed method, the effect of the system parameters and operating conditions on the stable regions is investigated. These results are useful for the design of the GTH system of pumped storage plants.

  2. Risk-constrained dynamic self-scheduling of a pumped-storage plant in the energy and ancillary service markets

    Energy Technology Data Exchange (ETDEWEB)

    Kazempour, S. Jalal; Moghaddam, M. Parsa; Haghifam, M.R.; Yousefi, G.R. [Department of Electrical Engineering, Tarbiat Modares University (TMU), Tehran (Iran)

    2009-05-15

    This work addresses a new framework for self-scheduling of an individual price-taker pumped-storage plant in a day-ahead (DA) market. The goal is achieving the best trade-off between the expected profit and the risks when the plant participates in DA energy, spinning reserve and regulation markets. In this paper, a set of uncertainties including price forecasting errors and also the uncertainty of power delivery requests in the ancillary service markets are contemplated. Considering these uncertainties, a new approach is proposed which is called dynamic self-scheduling (DSS). This risk-constrained dynamic self-scheduling problem is therefore formulated and solved as a mixed integer programming (MIP) problem. Numerical results for a case study are discussed. (author)

  3. Use of Cooling Thermal Storage as a Heat Sink for Steam Power Plant

    Science.gov (United States)

    Hegazy, Ahmed Sabry

    In the present paper, a system is proposed for improving the performance of steam power plant with air-cooled condenser during peak loads. In this system, the power plant comprises two steam turbines, and the air-cooled condenser is replaced by two condensers. The first one is air-cooled (dry) and used for condensing the exhaust steam of the first turbine, while the second is water-cooled and serves to condense the steam outlet of the second turbine. The warm cooling water exiting the wet condenser is pumped to a cooling storage container, where it is cooled and re-circulated to the wet condenser. Cooling is produced by a refrigeration machine driven by the extra electric power generated by the two turbines during the time of the off-peak-loads (low electricity rates). Simple energy analyses have been developed to predict the energy characteristics of this system. The results of this paper showed that the proposed system leads to improving the plant power output at peak-loads. About 6, 16, 24 and 33% increase in generated plant power can be achieved at peak-loads (high electricity rates) when the ambient temperature is 20, 30, 40 and 50°C respectively, and the whole steam exiting both turbines is cooled in a wet condenser to a design temperature of 20°C. The results showed also that choice of the capacity of each turbine is essentially affected by the quality of the refrigeration machine and ambient temperature.

  4. ANALYSIS ON THE ECONOMY OF THE THERMODYNAMIC PUMPED STORAGE POWER GENERATION%火力抽水—蓄能发电的经济性分析

    Institute of Scientific and Technical Information of China (English)

    盛建伦

    2001-01-01

    火力抽水—蓄能发电是由汽轮机直接带动水泵抽水蓄能发电。文中分析了火力抽水—蓄能发电的发电效率、投资效益以及技术上的可行性。与传统的抽水蓄能发电相比,火力抽水—蓄能发电减少了2次能量转换的损失和1次电能传输的损失,总的发电效率可提高10%以上。其运行方式是全天24h抽水,电网峰负荷时发电。锅炉、汽轮机都可以满负荷工作,得到最高的热效率。用火力抽水—蓄能发电厂取代同样规模的火电厂和抽水蓄能电站,可以提高发电效率,降低供电煤耗率,增加发电量,降低设备投资。%The power generation efficiency, investment benefit and technicalfeasibility of the thermodynamic pumped storage are analyzed. The thermodynamic pumped storage system is not using electricity, but using the steam turbine to pump water, directly converting heat energy to potential energy for storing energy and then generating power. Because the energy losses in twice energy converting processes and a transmission process are avoided, the efficiency may improve more than 10%. The running mode of thermodynamic pumped storage power generation is pumping in 24 h, generating in peak hours. The boiler, the steam turbine and the pump work in rated capacity, thus all getting the highest electric generation efficiency. The advantages of using a thermodynamic pumped storage power plant to replace a pumped storage power station and a fossil fuel power plant in same capacity are higher efficiency, less construction investment, more electric energy generation and less coal consumption rate.

  5. Off-stream Pumped Storage Hydropower plant to increase renewable energy penetration in Santiago Island, Cape Verde

    Science.gov (United States)

    Barreira, Inês; Gueifão, Carlos; Ferreira de Jesus, J.

    2017-04-01

    In order to reduce the high dependence on imported fuels and to meet the ongoing growth of electricity demand, Cape Verde government set the goal to increase renewable energy penetration in Santiago Island until 2020. To help maximize renewable energy penetration, an off-stream Pumped Storage Hydropower (PSH) plant will be installed in Santiago, in one of the following locations: Chã Gonçalves, Mato Sancho and Ribeira dos Picos. This paper summarizes the studies carried out to find the optimal location and connection point of the PSH plant in Santiago’s electricity network. This goal was achieved by assessing the impact of the PSH plant, in each location, on power system stability. The simulation tool PSS/E of Siemens was used to study the steady-state and dynamic behavior of the future (2020) Santiago MV grid. Different scenarios of demand and renewable resources were created. Each hydro unit of the PSH plant was modeled as an adjustable speed reversible turbine employing a DFIM. The results show that Santiago’s grid with the PSH plant in Chã Gonçalves is the one that has the best performance.

  6. Optimisation of Storage for Concentrated Solar Power Plants

    Directory of Open Access Journals (Sweden)

    Luigi Cirocco

    2014-12-01

    Full Text Available The proliferation of non-scheduled generation from renewable electrical energy sources such concentrated solar power (CSP presents a need for enabling scheduled generation by incorporating energy storage; either via directly coupled Thermal Energy Storage (TES or Electrical Storage Systems (ESS distributed within the electrical network or grid. The challenges for 100% renewable energy generation are: to minimise capitalisation cost and to maximise energy dispatch capacity. The aims of this review article are twofold: to review storage technologies and to survey the most appropriate optimisation techniques to determine optimal operation and size of storage of a system to operate in the Australian National Energy Market (NEM. Storage technologies are reviewed to establish indicative characterisations of energy density, conversion efficiency, charge/discharge rates and costings. A partitioning of optimisation techniques based on methods most appropriate for various time scales is performed: from “whole of year”, seasonal, monthly, weekly and daily averaging to those best suited matching the NEM bid timing of five minute dispatch bidding, averaged on the half hour as the trading settlement spot price. Finally, a selection of the most promising research directions and methods to determine the optimal operation and sizing of storage for renewables in the grid is presented.

  7. PUMPED STORAGE ENVIRONMENTAL EFFECTS: ASSESSMENT OF RESEARCH NEEDS

    Energy Technology Data Exchange (ETDEWEB)

    DH. Fickeisen

    1979-09-01

    Pumped storage hydroelectric systems convert large quantities of electrical energy to a form that may be stored and efficiently reconverted to electricity. Water is pumped from a lower reservoir to an upper reservoir during periods of low power demand. The stored water is then used to generate additional power when demand peaks. Since the basic requirements of the system are simple, the design of individual plants and their locations vary widely. These variations make assessment of the generic environmental impact of the pumped storage systems difficult. In addition, most studies have not examined the impacts of an operating plant comprehensively. Assessment of the environmental effects of development and operation of a pumped storage plant requires an extensive set of baseline information, which is deficient in several aspects at the present state of the art. Additional research is needed to: • identify species groups likely to survive and reproduce in pumped storage reservoirs, their relationships and habitat preferences, and the basis for their production; • characterize anticipated reservoir ecosystem community development and relate it to physical characteristics of pumped storage reservoirs; • define effects of plant design and operating parameters on transport of organisms through the pump/turbine facility, accounting for behavior of the organisms potentially impacted; • access the mortality rate of organisms likely to pass through pump-turbines; • identify the relative advantages and disadvantages of screening intake structures to prevent passage of large organisms through the plant; • assess the effects of currents and water withdrawal on migration and movement of aquatic species; • investigate the effects of fluctuating water levels on the littoral zone and riparian communities, effects of stranding on entrapment of fishes, and effects on fish spawning; and • review the applicability of water quality and ecosystem models to pumped storage

  8. Improving pumping system efficiency at coal plants

    Energy Technology Data Exchange (ETDEWEB)

    Livoti, W.C.; McCandless, S.; Poltorak, R. [Baldor Electric Co. (United States)

    2009-03-15

    The industry must employ ultramodern technologies when building or upgrading power plant pumping systems thereby using fuels more efficiently. The article discusses the uses and efficiencies of positive displacement pumps, centrifugal pumps and multiple screw pumps. 1 ref., 4 figs.

  9. Solar powered absorption cycle heat pump using phase change materials for energy storage

    Science.gov (United States)

    Middleton, R. L.

    1972-01-01

    Solar powered heating and cooling system with possible application to residential homes is described. Operating principles of system are defined and illustration of typical energy storage and exchange system is provided.

  10. Startup of Pumping Units in Process Water Supplies with Cooling Towers at Thermal and Nuclear Power Plants

    Energy Technology Data Exchange (ETDEWEB)

    Berlin, V. V., E-mail: vberlin@rinet.ru; Murav’ev, O. A., E-mail: muraviov1954@mail.ru; Golubev, A. V., E-mail: electronik@inbox.ru [National Research University “Moscow State University of Civil Engineering,” (Russian Federation)

    2017-03-15

    Aspects of the startup of pumping units in the cooling and process water supply systems for thermal and nuclear power plants with cooling towers, the startup stages, and the limits imposed on the extreme parameters during transients are discussed.

  11. 抽水蓄能机组无位置传感器静止变频器启动控制策略%A Control Strategy of Static Frequency Converter Start-up for Pumped-storage Power Plants Without Position Sensors

    Institute of Scientific and Technical Information of China (English)

    王德顺; 杨波; 李官军; 陶以彬; 姬联涛

    2012-01-01

    提出了一种抽水蓄能机组静止变频器启动控制策略,并根据理想同步电机数学模型分析了机组电压与磁通的关系,实现了机组启动过程中的无位置传感器转子位置检测。介绍了基于无位置传感器的转子初始位置检测、低频阶段转子位置估算的原理与实现方法,并进行了仿真验证。基于提出的控制策略,开发了大型抽水蓄能机组静止变频器启动装置,并应用于潘家口抽水蓄能电站90MW发电电动机的启动控制试验,实现了水泵启动过程的转子位置检测、脉冲换相、自然换相及同期控制。研究成果已在某抽水蓄能电站投入运行,通过了现场应用验证,证明了所提出方法的可行性。%A static frequency converter start-up control strategy for pumped-storage power unit is presented.Rotor position detection without position sensor is realized through voltage and magnetism equations of mathematical model of an ideal synchronous motor.The mechanism and implementation method of initial rotor position determination and rotor position estimation under low frequency without position sensor are expounded and validated by simulations.Based on the proposed control strategy,a static frequency converter start-up device for large-scale pumped-storage unit is developed,and applied to start-up control test in the 90 MW generator/motor of Panjiakou pumped-storage power plant.Test results show that rotor position detection,pulse commutation,natural commutation,and unit synchronous procedure control of static start-up have all been achieved.The outcomes have been applied to running of field equipment,which proves the feasibility of mentioned method.

  12. 利用风蓄联合削峰的电力系统经济调度%An Economic Dispatching Strategy of Peak Load Shifting by Wind Farm and Pumped Storage Plant

    Institute of Scientific and Technical Information of China (English)

    盛四清; 孙晓霞

    2014-01-01

    风电出力具有波动性和反调峰特性,大规模风电接入电网间接拉大了负荷的峰谷差,使火电机组频繁启停,系统运行成本增大。抽水蓄能电站因其良好的储能能力以及调度的高度灵活性往往作为系统的调峰电源。将二者结合,提出了风蓄联合系统削峰的调度策略,利用抽水蓄能的储能环节将风电出力时空平移,使原本波动无序的风电成为稳定可调度的电源,具备削峰填谷的能力,平滑净负荷曲线。建模引入最大化风蓄联合出力的目标函数,不仅减少了火电出力的燃煤耗费,而且避免了弃风的遗憾,充分发挥了风蓄节能环保的优势。算例分析验证了所提模型的可行性和有效性。%Power output of wind farm possesses both properties of fluctuation and counter-peak load regulation, therefore grid-connection of large-scale wind power enlarges the peak-to-valley difference of load indirectly and makes frequent start/stop of thermal generating units, thus the operational cost of power grid increases. Due to its excellent energy storage capability and outstanding dispatching flexibility, the pumped storage plant is often used for peak load shaving. Combining the wind farm with the pumped storage plant, a scheduling strategy based on the combination of the wind farm with the pumped storage plant is proposed. Utilizing the energy storage capability of the pumped storage plant the power output of the wind farm during the peak load period is transferred to the pumped storage plant to retain water, thus the stored wind power output, which disorderly fluctuates originally, can be used for peak load shaving. A multi-objective scheduling model of power grid containing the wind farm and the pumped storage plant, in which the minimum operational cost of thermal power generation units, the minimum variance of net load and the maximum power output of combined wind farms and pumped storage plants are taken

  13. A practical approach for implementing risk-based inservice testing of pumps at nuclear power plants

    Energy Technology Data Exchange (ETDEWEB)

    Hartley, R.S. [Idaho National Engineering Lab., Idaho Falls, ID (United States); Maret, D.; Seniuk, P.; Smith, L.

    1996-12-01

    The American Society of Mechanical Engineers (ASME) Center for Research and Technology Development`s (CRTD) Research Task Force on Risk-Based Inservice Testing has developed guidelines for risk-based inservice testing (IST) of pumps and valves. These guidelines are intended to help the ASME Operation and Maintenance (OM) Committee to enhance plant safety while focussing appropriate testing resources on critical components. This paper describes a practical approach for implementing those guidelines for pumps at nuclear power plants. The approach, as described in this paper, relies on input, direction, and assistance from several entities such as the ASME Code Committees, United States Nuclear Regulatory Commission (NRC), and the National Laboratories, as well as industry groups and personnel with applicable expertise. Key parts of the risk-based IST process that are addressed here include: identification of important failure modes, identification of significant failure causes, assessing the effectiveness of testing and maintenance activities, development of alternative testing and maintenance strategies, and assessing the effectiveness of alternative testing strategies with present ASME Code requirements. Finally, the paper suggests a method of implementing this process into the ASME OM Code for pump testing.

  14. A Novel Modeling of Molten-Salt Heat Storage Systems in Thermal Solar Power Plants

    Directory of Open Access Journals (Sweden)

    Rogelio Peón Menéndez

    2014-10-01

    Full Text Available Many thermal solar power plants use thermal oil as heat transfer fluid, and molten salts as thermal energy storage. Oil absorbs energy from sun light, and transfers it to a water-steam cycle across heat exchangers, to be converted into electric energy by means of a turbogenerator, or to be stored in a thermal energy storage system so that it can be later transferred to the water-steam cycle. The complexity of these thermal solar plants is rather high, as they combine traditional engineering used in power stations (water-steam cycle or petrochemical (oil piping, with the new solar (parabolic trough collector and heat storage (molten salts technologies. With the engineering of these plants being relatively new, regulation of the thermal energy storage system is currently achieved in manual or semiautomatic ways, controlling its variables with proportional-integral-derivative (PID regulators. This makes the overall performance of these plants non optimal. This work focuses on energy storage systems based on molten salt, and defines a complete model of the process. By defining such a model, the ground for future research into optimal control methods will be established. The accuracy of the model will be determined by comparing the results it provides and those measured in the molten-salt heat storage system of an actual power plant.

  15. Detailed partial load investigation of a thermal energy storage concept for solar thermal power plants with direct steam generation

    Science.gov (United States)

    Seitz, M.; Hübner, S.; Johnson, M.

    2016-05-01

    Direct steam generation enables the implementation of a higher steam temperature for parabolic trough concentrated solar power plants. This leads to much better cycle efficiencies and lower electricity generating costs. For a flexible and more economic operation of such a power plant, it is necessary to develop thermal energy storage systems for the extension of the production time of the power plant. In the case of steam as the heat transfer fluid, it is important to use a storage material that uses latent heat for the storage process. This leads to a minimum of exergy losses during the storage process. In the case of a concentrating solar power plant, superheated steam is needed during the discharging process. This steam cannot be superheated by the latent heat storage system. Therefore, a sensible molten salt storage system is used for this task. In contrast to the state-of-the-art thermal energy storages within the concentrating solar power area of application, a storage system for a direct steam generation plant consists of a latent and a sensible storage part. Thus far, no partial load behaviors of sensible and latent heat storage systems have been analyzed in detail. In this work, an optimized fin structure was developed in order to minimize the costs of the latent heat storage. A complete system simulation of the power plant process, including the solar field, power block and sensible and latent heat energy storage calculates the interaction between the solar field, the power block and the thermal energy storage system.

  16. A novel static frequency converter based on multilevel cascaded H-bridge used for the startup of synchronous motor in pumped-storage power station

    Energy Technology Data Exchange (ETDEWEB)

    Wang Feng, E-mail: sjtuwfeng@hotmail.co [Key Lab of Control of Power Transmission and Transformation, Ministry of Education, Department of Electrical Engineering, Shanghai Jiaotong University, Minhang District, Shanghai 200240 (China); Jiang Jianguo, E-mail: jiang@sjtu.edu.c [Key Lab of Control of Power Transmission and Transformation, Ministry of Education, Department of Electrical Engineering, Shanghai Jiaotong University, Minhang District, Shanghai 200240 (China)

    2011-05-15

    Research highlights: {yields} A novel Static Frequency Converter (SFC) based on multilevel cascaded H-bridge (CHB) topology is proposed and used for the reversible pump-generating units in pumped-storage power station. {yields} The novel SFC based on CHB has compact configuration, low current harmonic distortion and fast speed response. {yields} Rotor position and Grid connection are realized successfully by the novel SFC. -- Abstract: A novel static frequency converter (SFC) is proposed and is used firstly to start the reversible pump-generating units in pumped-storage power station. Multilevel cascaded H-bridge (CHB) topology and Insulated Gate Bipolar Transistor (IGBT) are applied in the novel SFC. In comparison with the conventional SFC adopting load-commutated inverter (LCI) which is composed of silicon-controlled rectifier (SCR), the novel one has plenty of advantages such as compact configuration, low current harmonic distortion and fast speed response, and these advantages have been verified during 2-year operation at Xiang Hong Dian Pumped-storage power station in China. This application shows that the novel SFC greatly enhances the reliability and success rate of connecting to grid for starting up the pump-generating units. The principle, characteristic and performance of the novel SFC are described in this paper, and some key issues related to the startup of the units of the pumped-storage power station are also presented.

  17. Numerical simulation on heat transfer characteristics of the storage tank for concentrating solar power plant

    Directory of Open Access Journals (Sweden)

    Qianjun Mao

    2016-06-01

    Full Text Available Concentrating solar power plant coupling with energy storage is a new and emerging technology, which can solve two issues, that is, low flux density and intermittent of solar energy. Heat transfer characteristics of the storage tank in this system have a key effect on the system’s efficiency and cost. In this article, the heat transfer performance of a phase change thermal storage tank has been proposed, and the temperature distribution and liquid fraction of phase change material in the tank has numerically been investigated. The results show that the temperature increases with the increasing charge time. The results also show that there is a phase change process at the charge time of 200 min, and no phase change for the charge time of 250 and 300 min. The results of this article can provide a reference for future design and optimal operation of the storage tank in concentrating solar power plant.

  18. Technical Feasibility Study of Thermal Energy Storage Integration into the Conventional Power Plant Cycle

    Directory of Open Access Journals (Sweden)

    Jacek D. Wojcik

    2017-02-01

    Full Text Available The current load balance in the grid is managed mainly through peaking fossil-fuelled power plants that respond passively to the load changes. Intermittency, which comes from renewable energy sources, imposes additional requirements for even more flexible and faster responses from conventional power plants. A major challenge is to keep conventional generation running closest to the design condition with higher load factors and to avoid switching off periods if possible. Thermal energy storage (TES integration into the power plant process cycle is considered as a possible solution for this issue. In this article, a technical feasibility study of TES integration into a 375-MW subcritical oil-fired conventional power plant is presented. Retrofitting is considered in order to avoid major changes in the power plant process cycle. The concept is tested based on the complete power plant model implemented in the ProTRAX software environment. Steam and water parameters are assessed for different TES integration scenarios as a function of the plant load level. The best candidate points for heat extraction in the TES charging and discharging processes are evaluated. The results demonstrate that the integration of TES with power plant cycle is feasible and provide a provisional guidance for the design of the TES system that will result in the minimal influence on the power plant cycle.

  19. Short term pumped storage scheduling using two proposed techniques

    Directory of Open Access Journals (Sweden)

    M.M. Salama, M.M. Elgazar, S.M. Abdelmaksoud, H.A. Henry

    2014-01-01

    Full Text Available In this paper, a genetic algorithm and constriction factor based particle swarm optimization technique are proposed for solving the short term pumped storage hydro thermal scheduling problem. The performance efficiency of the proposed techniques is demonstrated on hydrothermal test system comprising of five thermal units and one pumped storage power plant. A wide rang of thermal and hydraulic constraints are taken into consideration such as real power balance constraint, minimum and maximum limits of thermal units and pumped storage power plant, water discharge and water pumping rate limits and reservoir storage volume constraints. The simulation results obtained from the constriction factor based particle swarm optimization technique are compared with the outcomes obtained from the genetic algorithm in terms of cost saving and execution time to reveal the validity and verify the feasibility of the proposed methods. The test results show that the constriction factor based particle swarm optimization technique performs better than genetic algorithm in solving this problem in terms of cost saving and computational time.

  20. Analysis of Pumped Storage Plants (PSP) viability associated with other types of intermittent renewable energy

    Science.gov (United States)

    Andrade, J. G. P.; Barbosa, P. S. F.; Luvizotto, E., Jr.; Zuculin, S.; Pinto, Marrc; Tiago Filho, G. L.

    2014-03-01

    The energy generated by wind or solar photovoltaic (PV system) can be used by PSP to accumulate water in the upper reservoir, in the form of potential energy to be used later, during periods of high energy demand. This procedure offers the advantage of enabling the use of intermittent renewable energy source in times of growing needs of the electric power supply. The location of the PSP, the environmental aspects involved, their possible use for various purposes (stability of the power system at peak times, associate the turbine water for public supply purposes, among others) and the discussion of regulatory issues needs to be debated in the current context, where environmental issues require reliable sources of power generation and demand shows strong growth rates. A dynamic model is used to analyze the behavior of a PSP proposal for a site in Brazil, analyzing a complete cycle of its operation as a pump or turbine. The existing difficulties to use this proposal based on existing regulatory policies are also discussed, and a list of recommended adjustments is provided to allow the penetrations of PSP projects in the Brazilian institutional framework, coupled with other intermittent energy sources.

  1. Heat Transfer and Latent Heat Storage in Inorganic Molten Salts for Concentrating Solar Power Plants

    Energy Technology Data Exchange (ETDEWEB)

    Mathur, Anoop [Terrafore Inc.

    2013-08-14

    A key technological issue facing the success of future Concentrating Solar Thermal Power (CSP) plants is creating an economical Thermal Energy Storage (TES) system. Current TES systems use either sensible heat in fluids such as oil, or molten salts, or use thermal stratification in a dual-media consisting of a solid and a heat-transfer fluid. However, utilizing the heat of fusion in inorganic molten salt mixtures in addition to sensible heat , as in a Phase change material (PCM)-based TES, can significantly increase the energy density of storage requiring less salt and smaller containers. A major issue that is preventing the commercial use of PCM-based TES is that it is difficult to discharge the latent heat stored in the PCM melt. This is because when heat is extracted, the melt solidifies onto the heat exchanger surface decreasing the heat transfer. Even a few millimeters of thickness of solid material on heat transfer surface results in a large drop in heat transfer due to the low thermal conductivity of solid PCM. Thus, to maintain the desired heat rate, the heat exchange area must be large which increases cost. This project demonstrated that the heat transfer coefficient can be increase ten-fold by using forced convection by pumping a hyper-eutectic salt mixture over specially coated heat exchanger tubes. However,only 15% of the latent heat is used against a goal of 40% resulting in a projected cost savings of only 17% against a goal of 30%. Based on the failure mode effect analysis and experience with pumping salt at near freezing point significant care must be used during operation which can increase the operating costs. Therefore, we conclude the savings are marginal to justify using this concept for PCM-TES over a two-tank TES. The report documents the specialty coatings, the composition and morphology of hypereutectic salt mixtures and the results from the experiment conducted with the active heat exchanger along with the lessons learnt during

  2. 78 FR 15753 - Maintenance, Testing, and Replacement of Vented Lead-Acid Storage Batteries for Nuclear Power Plants

    Science.gov (United States)

    2013-03-12

    ... COMMISSION Maintenance, Testing, and Replacement of Vented Lead-Acid Storage Batteries for Nuclear Power..., DG-1269 ``Maintenance, Testing, and Replacement of Vented Lead-Acid Storage Batteries for Nuclear... lead-acid storage batteries in nuclear power plants. DATES: Submit comments by May 13, 2013....

  3. 78 FR 58574 - Maintenance, Testing, and Replacement of Vented Lead-Acid Storage Batteries for Nuclear Power Plants

    Science.gov (United States)

    2013-09-24

    ... COMMISSION Maintenance, Testing, and Replacement of Vented Lead-Acid Storage Batteries for Nuclear Power..., Testing, and Replacement of Vented Lead-Acid Storage Batteries for Nuclear Power Plants.'' The guide... with regard to the maintenance, testing, and replacement of vented lead-acid storage batteries...

  4. Optimal Operation Model for Wind Power-Pumped Storage Power Station and Case Study for Hebei South Power Grid%风电-抽水蓄能系统优化运行建模与河北南网案例分析

    Institute of Scientific and Technical Information of China (English)

    高丹; 胡三高; 范辉; 蒋东方; 徐鸿; 唐宝峰

    2011-01-01

    以风电入网时与储能电站联合运行方式为背景,以得到协调运行控制策略为目的,拟定了风电-抽水蓄能联合系统的3种运行方案:风电全部通过抽水蓄能发电来实现并网;电网允许一个较小的基准容量的风电直接并网,其余风电通过抽水蓄能来实现并网;电网允许一个较大的基准容量的风电直接并网,其余风电通过抽水蓄能来实现并网.分析了风电机组不同典型日的运行曲线,结果表明:不同运行方式对抽水蓄能电站的协调运行控制策略影响不同,抽水蓄能电站作用取决于电站规模,并给出了联合运行系统的协调控制基本原则.%As to the combined operation mode with grid-connected wind power and energy storage station, three feasible operation schemes for wind power-pumped storage system are proposed to get coordinated control strategy. The scheme Ⅰ is that all of wind power is transmitted to power grid through pumped storage plants. Scheme Ⅱ is that small part of wind power is directly transmitted to power grid,while the rest is transmitted to power grid through pumped storage plants. Scheme Ⅲ is that a large part of wind power is directly transmitted to power grid, the rest is transmitted to power grid through pumped storage plants. From the analysis on operating curve of different classical dates for a wind turbine, it is shown that different operating modes have different influence on coordinated operation control strategies of pumped storage power plant, the effect of pumped storage power station depends on its scale, and the basic principle of coordinated control for combined operating system is given.

  5. Simultaneous Imbalance Reduction and Peak Shaving using a Field Operational Virtual Power Plant with Pumps

    NARCIS (Netherlands)

    Pruissen, O.P. van; Kok, J.K.; Eisma, A.

    2015-01-01

    The Dutch electricity infrastructure is challenged by the deployment of large numbers of heat pumps in newly-built domestic residences. An example is the apartment complex of Couperus in The Hague where 300 apartments are heated by individual heat pumps. This building was operated as a Virtual Power

  6. Simultaneous Imbalance Reduction and Peak Shaving using a Field Operational Virtual Power Plant with Pumps

    NARCIS (Netherlands)

    Pruissen, O.P. van; Kok, J.K.; Eisma, A.

    2015-01-01

    The Dutch electricity infrastructure is challenged by the deployment of large numbers of heat pumps in newly-built domestic residences. An example is the apartment complex of Couperus in The Hague where 300 apartments are heated by individual heat pumps. This building was operated as a Virtual Power

  7. Optimizing a Hybrid Energy Storage System for a Virtual Power Plant for Improved Wind Power Generation: A Case Study for Denmark

    DEFF Research Database (Denmark)

    Braun, Philipp; Swierczynski, Maciej Jozef; Diosi, Robert

    2011-01-01

    This paper describes one approach to find two optimum energy storages (ESs) to build a hybrid system which is part of a virtual power plant. Here it means the combination of the hybrid energy storage system and wind power plant (WPP). The discussed approach is applied in a case study on the power...

  8. 抽水蓄能电站可逆式水泵水轮机发展现状与展望%Development of Reversible Pump-Turbines in Pumped Storage Power Stations and Their Prospects

    Institute of Scientific and Technical Information of China (English)

    赵万勇; 马达; 曾玲

    2012-01-01

    On the basis of wind power development in Gansu province and the pumped storage development of the world.the necessity of developing our pumped storage power stations in China is elaborated. Various types of hydraulic pump-turbines in pumped storage power stations are introduced (the tendency of development of reversible hydraulic pump-turbines are discussed;the domestic and international studies in this field are also related. It is pointed out that in China,the R&-D ability of pumped storage power stations is still low,but we have a bright future.%从甘肃省的风电发展和世界抽水蓄能发展情况讨论了我国抽水蓄能电站建设的必要性;介绍了抽水蓄能电站中水泵水轮机的各种型式,分析了国内外在这方面的研究现状;对可逆式水泵水轮机的发展趋势和存在的问题进行了探讨;认为仍需加强我国抽水蓄能电站机组的研发能力,并展望了我国抽水蓄能电站的发展宏图.

  9. CO2 capture and storage in Greece: A case study from komotini ngcc power plant

    Directory of Open Access Journals (Sweden)

    Koukouzas Nikolaos

    2006-01-01

    Full Text Available The aim of this paper is to examine the possibilities for the abatement of CO2 emissions in the Greek fossil fuel power generation sector. An overview of CO2 capture, transportation, and storage concepts, on which the R&D community is focused, is presented. The implementation of post-combustion CO2 capture options in an existing fossil fuel power plant is then examined and the consequences on the overall plant performance are determined. Finally, the possibilities of transportation and then underground storage of the pure CO2 stream are analyzed taking into account both technical and economical factors. The results of this analysis show that CO2 sequestration is technically feasible for existing fossil fuel fired power plants in Greece. However, substantial reduction in plant efficiency is observed due to increased energy demand of the technologies used as well as in electricity production cost due to capital and operation costs of capture, transport, and storage of CO2. .

  10. 风电与抽水蓄能联合优化运行%Optimization Operation of Wind Power and Pumped Storage

    Institute of Scientific and Technical Information of China (English)

    赵诗雅; 常帅; 王仕龙; 杨培培

    2015-01-01

    Pumped storage power combined power plant and wind farm operation not only can better meet the needs of actual load,but also get more substantial economic benefits.Considering reservoir capacity and unit start stop and the fluc-tuation of electricity price and other constraints,the economy and stability of the target of joint optimal operation mode with wind power and pumped storage is proposed in this article.In order to verify the feasibility of the mode,genetic algorithm is used to solve the problem of practical examples.The simulation results show that the established model and the feasibili-ty and effectiveness of the algorithm.%抽水蓄能电站与风电场联合运行不仅能够较好地满足实际负荷的需求,还能获得更丰厚的经济效益。在考虑水库容量、机组启停以及波动电价等约束条件前提下,文中提出以经济性和稳定性为目标的风电与抽水蓄能联合优化运行模式。为验证所建模式可行,采用遗传算法对实际生活中的算例进行求解,仿真分析结果表明:所建的模型和所用算法是可行和有效的。

  11. Power Oscillation Damping Controller for Wind Power Plant Utilizing Wind Turbine Inertia as Energy Storage

    DEFF Research Database (Denmark)

    Knüppel, Thyge; Nielsen, Jørgen Nygård; Jensen, Kim Høj

    2011-01-01

    that utilizes the stored kinetic energy in the wind turbine (WT) mechanical system as energy storage from which damping power can be exchanged. This eliminates the need for curtailed active power production. Results are presented using modal analysis and induced torque coefficients (ITC) to depict the torques...... induced on the synchronous generators from the POD. These are supplemented with nonlinear time domain simulations with and without an auxiliary POD for the WPP. The work is based on a nonlinear, dynamic model of the 3.6 MW Siemens Wind Power wind turbine....

  12. Evaluation of different operating strategies to integrate storage in a linear Fresnel ORC power plant

    Science.gov (United States)

    Zoschke, Theda; Seubert, Bernhard; Fluri, Thomas

    2017-06-01

    An existing linear Fresnel power plant with ORC process located in Ben Guerir, Morocco, is retrofitted with a thermal energy storage system and additional collector loops. Two different plant configurations are investigated in this paper. In the first configuration two separate solar fields are built and only the minor one can charge the storage. In the second configuration, there is only one large solar field which offers more flexibility. Two different control strategies are assessed by comparing simulation results. It shows that the simulations of the systems with two solar fields results in higher energy yields throughout the year, but the power production of the system with one solar field is much more flexible and demand oriented. Also it offers great potential for improvement when it comes to weather forecasting.

  13. Energy Management of an Off-Grid Hybrid Power Plant with Multiple Energy Storage Systems

    Directory of Open Access Journals (Sweden)

    Laura Tribioli

    2016-08-01

    Full Text Available In this paper, an off-grid hybrid power plant with multiple storage systems for an artificial island is designed and two possible strategies for the management of the stored energy are proposed. Renewable power sources (wind/solar technologies are used as primary power suppliers. A lead-acid battery pack (BAT and a reversible polymer electrolyte fuel cell are employed to fulfill the power demand and to absorb extra power. The reversible fuel cell allows reducing costs and occupied space and the fuel cell can be fed by the pure hydrogen produced by means of its reversible operation as an electrolyzer. A diesel engine is employed as backup system. While HOMER Pro® has been employed for a full-factorial-based optimization of the sizes of the renewable sources and the BAT, Matlab/Simulink® has been later used for simulating the plant operation and compare two possible power management control strategies. For the reversible fuel cell sizing, a sensitivity analysis has been carried out varying stack and hydrogen tank sizes. The final choice for plant configuration and power management control strategy has been made on the basis of a comparative analysis of the results, aimed at minimizing fossil fuel consumption and CO2 emissions, battery aging rate and at maximizing the power plant overall efficiency. The obtained results demonstrate the possibility of realizing a renewable power plant, able to match the needs of electrical power in a remote area, by achieving a good integration of different energy sources and facing the intermittent nature of renewable power sources, with very low use of fossil fuels.

  14. Ideal Operation of a Photovoltaic Power Plant Equipped with an Energy Storage System on Electricity Market

    Directory of Open Access Journals (Sweden)

    Markku Järvelä

    2017-07-01

    Full Text Available There is no natural inertia in a photovoltaic (PV generator and changes in irradiation can be seen immediately at the output power. Moving cloud shadows are the dominant reason for fast PV power fluctuations taking place typically within a minute between 20 to 100% of the clear sky value roughly 100 times a day, on average. Therefore, operating a utility scale grid connected PV power plant is challenging. Currently, in many regions, renewable energy sources such as solar and wind receive feed-in tariffs that ensure a certain price for the energy. On the other hand, electricity markets operate on a supply-demand principle and a typical imbalance settlement period is one hour. This paper presents the energy, power and corresponding requirements for an energy storage system in a solar PV power plant to feed the power to the grid meeting the electricity spot markets practices. An ideal PV energy production forecast is assumed to be available to define reference powers of the system for the studied imbalance settlement periods. The analysis is done for three different PV system sizes using the existing irradiance measurements of the Tampere University of Technology solar PV power station research plant.

  15. Pump power in Norway: the costs and a potential prospect; Pumpekraft i Noreg: kostnadar og utsikter til potensial

    Energy Technology Data Exchange (ETDEWEB)

    Hamnaberg, Haavard

    2011-07-01

    Pumped storage power plants have long been used to regulate the production relative variations in consumption, but there is no preliminary pumping power plant in Norway built to regulate on short terms. To increase the knowledge about the possibilities to establish a pumping power plant in Norway, NVE has therefore been made a study of how pumping power can be drawn up and what it costs to build pumped storage plant between already existing magazine. One can not just based on cost and design conclude anything about the potential for pumped storage plant in Norway, but it is a start of a work that might make it easier to assess to what extent this may be possible. (eb)

  16. Simulation and comparison of different operational strategies for storage utilization in concentrated solar power plants

    Science.gov (United States)

    García-Barberena, Javier; Erdocia, Ioseba

    2016-05-01

    The increase of electric power demand and the wish to protect the environment are leading to a change in the energy sources. Conventional energy plants are losing strength against the renewable energy plants and, in particular, solar energy plants have a huge potential to provide clean energy supply for the increasing world's energy demand. Among the existing solar technologies, Concentrating Solar Power (CSP) is one of the most promising technologies. One of the major advantages of CSP plants is the technically feasible and cost-effective integration of Thermal Energy Storage (TES) systems. To increase the plant dispatchability, it is possible to create different operational strategies defining how such TES system is used. In this work, different strategies with different overall goals have been simulated over a complete year and the results are presented and compared here to demonstrate the capabilities of the operational strategies towards an increased dispatchability and plant economic effectiveness. The analysis shows that different strategies may lead to significant differences in the plant annual production, expected economic incomes, number of power block stops, mean efficiency, etc. Specifically, it has been found that the economic incomes of a plant can be increased (+1.3%) even with a decreased total energy production (-1.5%) if the production is scheduled to follow a demand/price curve. Also, dramatic reduction in the number of turbine stops (-67%) can be achieved if the plant is operated towards this objective. The strategies presented in this study have not been optimized towards any specific objective, but only created to show the potential of well designed operational strategies in CSP plants. Therefore, many other strategies as well as optimized versions of the strategies explained below are possible and will be analyzed in future works.

  17. Final Report-- A Novel Storage Method for Concentrating Solar Power Plants Allowing Storage at High Temperature

    Energy Technology Data Exchange (ETDEWEB)

    Morris, Jeffrey F.

    2014-09-29

    The main objective of the proposed work was the development and testing of a storage method that has the potential to fundamentally change the solar thermal industry. The development of a mathematical model that describes the phenomena involved in the heat storage and recovery was also a main objective of this work. Therefore, the goal was to prepare a design package allowing reliable scale-up and optimization of design.

  18. The cost of carbon capture and storage for natural gas combined cycle power plants.

    Science.gov (United States)

    Rubin, Edward S; Zhai, Haibo

    2012-03-20

    This paper examines the cost of CO(2) capture and storage (CCS) for natural gas combined cycle (NGCC) power plants. Existing studies employ a broad range of assumptions and lack a consistent costing method. This study takes a more systematic approach to analyze plants with an amine-based postcombustion CCS system with 90% CO(2) capture. We employ sensitivity analyses together with a probabilistic analysis to quantify costs for plants with and without CCS under uncertainty or variability in key parameters. Results for new baseload plants indicate a likely increase in levelized cost of electricity (LCOE) of $20-32/MWh (constant 2007$) or $22-40/MWh in current dollars. A risk premium for plants with CCS increases these ranges to $23-39/MWh and $25-46/MWh, respectively. Based on current cost estimates, our analysis further shows that a policy to encourage CCS at new NGCC plants via an emission tax or carbon price requires (at 95% confidence) a price of at least $125/t CO(2) to ensure NGCC-CCS is cheaper than a plant without CCS. Higher costs are found for nonbaseload plants and CCS retrofits.

  19. Analysis and evaluation of "noise" of occupational hazards in pumped storage power station

    Science.gov (United States)

    Zhao, Xin; Yang, Hongjian; Zhang, Huafei; Chen, Tao

    2017-05-01

    Aiming at the influence of "noise" of occupational hazards on the physical health of workers, the noise intensity of a working area of a hydropower station in China was evaluated comprehensively. Under the condition of power generation, noise detection is conducted on the main patrol area of the operator, and the noise samples in different regions are analyzed and processed by the single factor analysis of variance. The results show that the noise intensity of different working areas is significantly different, in which the overall noise level of the turbine layer is the highest and beyond the national standard, the protection measures need to be strengthened and the noise intensity of the rest area is normal

  20. Aging of turbine drives for safety-related pumps in nuclear power plants

    Energy Technology Data Exchange (ETDEWEB)

    Cox, D.F. [Oak Ridge National Lab., TN (United States)

    1995-06-01

    This study was performed to examine the relationship between time-dependent degradation and current industry practices in the areas of maintenance, surveillance, and operation of steam turbine drives for safety-related pumps. These pumps are located in the Auxiliary Feedwater (AFW) system for pressurized-water reactor plants and in the Reactor Core Isolation Cooling and High-Pressure Coolant Injection systems for boiling-water reactor plants. This research has been conducted by examination of failure data in the Nuclear Plant Reliability Data System, review of Licensee Event Reports, discussion of problems with operating plant personnel, and personal observation. The reported failure data were reviewed to determine the cause of the event and the method of discovery. Based on the research results, attempts have been made to determine the predictability of failures and possible preventive measures that may be implemented. Findings in a recent study of AFW systems indicate that the turbine drive is the single largest contributor to AFW system degradation. However, examination of the data shows that the turbine itself is a reliable piece of equipment with a good service record. Most of the problems documented are the result of problems with the turbine controls and the mechanical overspeed trip mechanism; these apparently stem from three major causes which are discussed in the text. Recent improvements in maintenance practices and procedures, combined with a stabilization of the design, have led to improved performance resulting in a reliable safety-related component. However, these improvements have not been universally implemented.

  1. 基于机会约束规划的风-蓄联合动态经济调度%A Chance-Constrained Programming Based Dynamic Economic Dispatch of Wind Farm and Pumped-Storage Power Station

    Institute of Scientific and Technical Information of China (English)

    于佳; 任建文; 周明

    2013-01-01

    Grid-connection of large-scale wind farm with stochastic, fluctuating and counter-peak load regulation features brings severe challenges to dispatching and operation of power grid. According to the output characteristics of wind power generation system, based on smart energy management system (SEMS) a joint dispatching strategy for wind farm and pumped-storage power station is proposed, and based on stochastic programming a dynamic economic dispatching model for power grid with joint-operated wind farm and pumped-storage power station, in which the minimized fluctuation of wind power output alleviated by pumped-storage power and the lowest operating cost of thermal power plants are taken as the objectives, is built and the built model is solved by chaotic particle swarm optimization algorithm. Simulation results of a joint dynamic dispatch of a certain regional power grid composed of thermal plants, wind farm and pumped-storage power station show that the proposed dynamic economic dispatching strategy is reasonable and effective.%  大规模具有随机性、波动性和反调峰特性的风电接入电力系统后,给电力系统的调度运行带来了很大挑战。针对风电出力特性,提出了基于智能能量管理系统(smart energy management system,SEMS)的风-蓄联合调度策略,基于随机规划理论建立了经抽水储能平抑后以风电功率波动最小和火电运行成本最低为目标的风–蓄联合运行的电力系统动态经济调度模型,并采用混沌粒子群优化算法求解模型。仿真结果表明了该调度策略的合理性及有效性。

  2. Subsurface injection of combustion power plant effluent as a solid-phase carbon dioxide storage strategy

    Science.gov (United States)

    Darnell, K. N.; Flemings, P. B.; DiCarlo, D.

    2017-06-01

    Long-term geological storage of CO2 may be essential for greenhouse gas mitigation, so a number of storage strategies have been developed that utilize a variety of physical processes. Recent work shows that injection of combustion power plant effluent, a mixture of CO2 and N2, into CH4 hydrate-bearing reservoirs blends CO2 storage with simultaneous CH4 production where the CO2 is stored in hydrate, an immobile, solid compound. This strategy creates economic value from the CH4 production, reduces the preinjection complexity since costly CO2 distillation is circumvented, and limits leakage since hydrate is immobile. Here we explore the phase behavior of these types of injections and describe the individual roles of H2O, CO2, CH4, and N2 as these components partition into aqueous, vapor, hydrate, and liquid CO2 phases. Our results show that CO2 storage in subpermafrost or submarine hydrate-forming reservoirs requires coinjection of N2 to maintain two-phase flow and limit plugging.

  3. Advanced thermal-energy-storage concept-definition study for solar Brayton power plants. Final technical report, Volume I

    Energy Technology Data Exchange (ETDEWEB)

    1976-01-01

    The detailed results are presented of a technical and economic assessment of phase change and thermochemical energy storage systems in a solar power plant employing a high temperature Brayton cycle thermal engine with helium as the heat transport fluid. The assessment included an examination of the storage system operation, efficiency, power plant interaction, design, materials, safety, maintenance, environmental impact, system life, and economics. These considerations are implemented in the conceptual design of three baseline storage systems and their components for use in a solar power plant module of 50 megawatt electrical power output. Rationale is provided to support the configuration, operation and material choices. A preliminary assessment of the technology development and experimental test program requirements are also included. The report is contained in four separate volumes. This volume is the technical report.

  4. Thermocline thermal storage systems for concentrated solar power plants: One-dimensional numerical model and comparative analysis

    DEFF Research Database (Denmark)

    Modi, Anish; Pérez-Segarra, Carlos David

    2014-01-01

    Concentrated solar power plants have attracted increasing interest from researchers and governments all over the world in recent years. An important part of these plants is the storage system which improves dispatchability and makes the plant more reliable. In this paper, a one......-dimensional transient mathematical model for a single-tank thermocline thermal energy storage system is presented. The model used temperature dependent correlations to obtain the thermophysical properties for the heat transfer fluid and considered heat loss through the tank wall. The effect of variation in important...... required to attain equilibrium conditions. These aspects directly influence the discharge capacity and discharge power of the storage system, and therefore play an essential role in understanding the start-up characteristics of the system and provide an insight regarding the availability of storage when...

  5. 77 FR 47628 - Eagle Mountain Pumped Storage Hydroelectric Project; Eagle Crest Energy; Notice of Meeting...

    Science.gov (United States)

    2012-08-09

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Eagle Mountain Pumped Storage Hydroelectric Project; Eagle Crest Energy... Management Act and the Federal Power Act), on the Eagle Mountain Pumped Storage Hydroelectric...

  6. Modeling Pumped Thermal Energy Storage with Waste Heat Harvesting

    Science.gov (United States)

    Abarr, Miles L. Lindsey

    This work introduces a new concept for a utility scale combined energy storage and generation system. The proposed design utilizes a pumped thermal energy storage (PTES) system, which also utilizes waste heat leaving a natural gas peaker plant. This system creates a low cost utility-scale energy storage system by leveraging this dual-functionality. This dissertation first presents a review of previous work in PTES as well as the details of the proposed integrated bottoming and energy storage system. A time-domain system model was developed in Mathworks R2016a Simscape and Simulink software to analyze this system. Validation of both the fluid state model and the thermal energy storage model are provided. The experimental results showed the average error in cumulative fluid energy between simulation and measurement was +/- 0.3% per hour. Comparison to a Finite Element Analysis (FEA) model showed energy of a recently proposed Pumped Thermal Energy Storage and Bottoming System (Bot-PTES) that uses ammonia as the working fluid. This analysis focused on the effects of hot thermal storage utilization, system pressure, and evaporator/condenser size on the system performance. This work presents the estimated performance for a proposed baseline Bot-PTES. Results of this analysis showed that all selected parameters had significant effects on efficiency, with the evaporator/condenser size having the largest effect over the selected ranges. Results for the baseline case showed stand-alone energy storage efficiencies between 51 and 66% for varying power levels and charge states, and a stand-alone bottoming efficiency of 24%. The resulting efficiencies for this case were low compared to competing technologies; however, the dual-functionality of the Bot-PTES enables it to have higher capacity factor, leading to 91-197/MWh levelized cost of energy compared to 262-284/MWh for batteries and $172-254/MWh for Compressed Air Energy Storage.

  7. Pumped Storage and Potential Hydropower from Conduits

    Energy Technology Data Exchange (ETDEWEB)

    none,

    2015-02-25

    Th is Congressional Report, Pumped Storage Hydropower and Potential Hydropower from Conduits, addresses the technical flexibility that existing pumped storage facilities can provide to support intermittent renewable energy generation. This study considered potential upgrades or retrofit of these facilities, the technical potential of existing and new pumped storage facilities to provide grid reliability benefits, and the range of conduit hydropower opportunities available in the United States.

  8. Isobar gas and steam. Compressed air storage plant with heat storage; Isobares GuD. Druckluftspeicherkraftwrk mit Waermespeicher

    Energy Technology Data Exchange (ETDEWEB)

    Schlitzberger, Christian; Leithner, Reinhard; Nielsen, Lasse [Technische Univ. Braunschweig (Germany). Inst. fuer Waerme- und Brennstofftechnik

    2008-07-01

    Due to the worldwide increasing energy consumption the unfavourable aspects of the today's power supply structure are strengthened continuously. There are two compressed air energy storage power stations existing. However, these power stations exhibit worse efficiencies of storage in comparison to existing pumped-storage power plants. In order to avoid this disadvantage, a concept of a isobaric gas and steam compressed air storage plant was developed at the institute for heat and fuel technology at the technical university of Braunschweig. This concept is presented in the contribution under consideration.

  9. Power storage system technology development. Toshiba's achievements and prospects of storage testing equipment in the Tatsumi plant of the Kansai Electric Power Co. , Ltd

    Energy Technology Data Exchange (ETDEWEB)

    1988-07-01

    In the Tatsumi substation, Toshiba corporation built a power storage testing plant using revised lead batteries and has been test-running it since 1986. The storage system consists of (1) 526 revised-type lead batteries connected in series, (2) an AC/DC converter for connection to a DC system using a self-excited converter, and a measuring/monitoring operation control system. The converter synthesizes single-phase bridge fundamental units by using a transformer, thus eliminating all waves except higher harmonic waves. The system uses a vacuum circuit breaker for connection to AC lines, an output transformer for increasing converter voltage, and a DC high-speed circuit breader for DC circuits. The system achieves (a) a minimum charge/discharge energy efficiency of 70 % during constant-power operation at 500 kW or 1,000 kW, (b) a maximum response time of 10 seconds with regard to ordinary step changes in the effective/ineffective power setting, (c) and an overall voltage distortion factor of 2 %. Test results related to protective system behavior and environmental measurements were also satisfactory. (2 figs, 3 tabs)

  10. Life cycle assessment of primary control provision by battery storage systems and fossil power plants

    OpenAIRE

    Koj, Jan Christian; Stenzel, Peter; Schreiber, Andrea; Hennings, Wilfried; Zapp, Petra; Wrede, Gunnar; Hahndorf, Ina

    2015-01-01

    Increasing renewable energy generation influences the reliability of electric power grids. Thus, there is a demand for new technical units providing ancillary grid services. Intermittent renewable energy sources can be balanced by energy storage devices, especially battery storage systems. By battery systems grid efficiency and reliability as well as power quality can be increased. A further characteristic of battery systems is the ability to respond rapidly and precisely to frequency deviati...

  11. Role of Pumped Storage Hydro Resources in Electricity Markets and System Operation: Preprint

    Energy Technology Data Exchange (ETDEWEB)

    Ela, E.; Kirby, B.; Botterud, A.; Milostan, C.; Krad, I.; Koritarov, V.

    2013-05-01

    The most common form of utility- sized energy storage system is the pumped storage hydro system. Originally, these types of storage systems were economically viable simply because they displace more expensive generating units. However, over time, as those expensive units became more efficient and costs declined, pumped hydro storage units no longer have the operational edge. As a result, in the current electricity market environment, pumped storage hydro plants are struggling. To offset this phenomenon, certain market modifications should be addressed. This paper will introduce some of the challenges faced by pumped storage hydro plants in today's markets and purpose some solutions to those problems.

  12. Increasing RES Penetration and Security of Energy Supply by Use of Energy Storages and Heat Pumps in Croatian Energy System

    DEFF Research Database (Denmark)

    Krajačić, Goran; Mathiesen, Brian Vad; Duić, Neven;

    2010-01-01

    In this paper integration of wind power generation into the Croatian electricity supply is analysed using available technologies. The starting point is a model of the energy system in Croatia in 2007. Comprehensive hour-by-hour energy system analyses are conducted of a complete system meeting...... electricity, heat and transport demands, and including renewable energy, power plants, and combined heat and power production (CHP) for district heating. Using the 2007 energy system the wind power share is increased by two energy storage options: Pumped hydro and heat pumps in combination with heat storages...... with specific regulation of power system could additionally increase wind penetration for 0.37 TWh. Hence, with the current technologies installed in the Croatian energy system the installed pumped hydro-plant may facilitate more than 10% wind power in the electricity system. Large-scale integration of wind...

  13. Report on technical feasibility of underground pumped hydroelectric storage

    Science.gov (United States)

    Doherty, T. J.

    1982-03-01

    The technical and economic aspects of constructing a very high head underground hydroelectric pumped storage were examined at a prefeasibility level. Excavation of existing caverns in the West Rutland Vermont marble quarry would be used to construct the underground space. A plant capacity of 1200 MW and 12 h of continuous capacity were chosen as plant operating conditions. The site geology, plant design, and electrical and mechanical equipment required were considered. It was concluded that the cost of the 1200 MW underground pumped storage hydro electric project at this site, even with the proposed savings from marketable material, amount to between $581 and $595 per kilowatt of installed capacity on a January 1982 pricing level. It was concluded that the West Rutland underground pumped storage facility is uneconomic at this time.

  14. Model and operation strategy of pumped-storage in hybrid power system%多能互补发电系统抽水蓄能模型及运行策略

    Institute of Scientific and Technical Information of China (English)

    任岩; 郑源; 周兵; 郭齐珂

    2013-01-01

    Based on the characteristics of hybrid power system, a mathematical model of pumped-storage was established. According to its function, the pumped-storage operation strategy was put forward, that is, to operate as per given load and specifically in the hybrid wind-PV-pumped-storage system, to operate as per net load. A control model of pumped-storage was accordingly proposed; as the net load was greater than zero, the pumped-storage unit operated under the turbine operating conditions could be classified into three situations. Firstly, as net load was less than the starting power of turbine, pumped-storage units were not operating. Secondly, as net load was greater than the starting power and less than the rated power of turbine, pumped-storage units were operating at the turbine condition as net load power. Thirdly, as net load was less than the rated power of turbine, pumped-storage units were operating as the rated power of turbine. When net load was less than zero, pumped-storage units operated under the pump operating conditions could be classified into two situations. Firstly, as net load was less than the rated power of pump, pumped-storage units were not operating. Secondly, as net load was greater than the rated power of pump, pumped-storage units were operating as the rated power of pump.%根据多能互补发电系统的特点和作用,建立了系统中抽水蓄能的数学模型,提出了系统中抽水蓄能的运行策略,即按给定负荷运行,具体在本系统中即为按系统净负荷运行.由此提出系统中抽水蓄能的控制方式.当系统净负荷大于0时,抽水蓄能机组运行在水轮机工况,分3种情况:当系统净负荷小于水轮机工况的启动功率时,抽水蓄能机组不运行;当系统净负荷大于水轮机工况的启动功率而小于水轮机工况的额定功率时,抽水蓄能机组按净负荷功率运行在水轮机工况;当系统净负荷小于水轮机的额定功率时,抽水蓄能机组按水

  15. 抽水蓄能电站与风电的联合优化运行建模及应用分析%Modeling and Application Analysis of Optimal Joint Operation of Pumped Storage Power Station and Wind Power

    Institute of Scientific and Technical Information of China (English)

    徐飞; 陈磊; 金和平; 刘振华

    2013-01-01

    With its excellent peak clipping and valley filling capability, the pumped storage power station can improve the accommodation capability of the wind power. Based on the actual data of West Inner Mongolia power grid and Hohhot pumped storage power station, the optimal joint operation of pumped storage power station and large-scale grid-connected wind power is simulated and investigated. By considering the intermittency and fluctuation of wind power, an optimization model for the joint operation is developed. The validity of the model is verified through simulation of the joint operation of Hohhot pumped storage power station and wind power integrated to West Inner Mongolia power grid based on the actual data of heating season and nonheating season. The simulation also shows the feasibility and benefit of the joint operation. During the heating season when part of the wind power is curtailed, the pumped storage power station shifts peak load and helps the power grid to accommodate more wind power. During the nonheating season with little wind power curtailment, the pumped storage power station is reserved for wind power and balances the fluctuation of wind power.%抽水蓄能电站具有优良的调峰填谷能力,能够有效提高电网消纳风电的能力.基于蒙西电网和呼和浩特抽水蓄能电站的实际数据,对抽水蓄能电站与大规模并网风电联合优化运行进行了模拟和研究.考虑风电的间歇性和波动性,建立了抽水蓄能电站与风电联合运行的优化模型.然后分别利用供热期和非供热期的系统数据,对蒙西电网中呼和浩特抽水蓄能电站与风电的联合运行进行了模拟,验证了模型的有效性,并说明了抽水蓄能电站与大规模并网风电联合运行的可行性以及带来的显著效益:供热期存在弃风时,抽水蓄能电站充分发挥调峰填谷的能力以减少弃风;非供热期弃风不明显时,抽水蓄能电站主要为风电提供备用,并平衡风电出力波动.

  16. Modeling and numerical simulation of a novel solar-powered absorption air conditioning system driven by a bubble pump with energy storage

    Institute of Scientific and Technical Information of China (English)

    QIU Jia; LIANG Jian; CHEN GuangMing; DU RuXu

    2009-01-01

    This paper presents a novel solar-powered absorption air conditioning system driven by a bubble pump with energy storage. It solves the problem of unreliable solar energy supply by storing the working fluids and hence, functions 24 h per day. First, the working principles are described and the dynamic models for the primary energy storage components are developed. Then, the system is evaluated based on a numerical simulation. Based on the meteorological data of a typical day in a subtropical area, with the area of a solar collector being set at 19.15 m2, whilst the initial charging mass, mass fraction and temperature of the solution are respectively set at 379.5 kg, 54.16% and 34.5 ℃, it is found that the respective coefficients of performance (COP) of the air conditioning system and the en-tire system (including the solar panel) are 0.7771 and 0.4372. In particular, the energy storage density of the system is 206.69 MJ/m3 which is much greater than those of chilled water or hot water storage systems under comparable conditions. This makes the new system much more compact and efficient. Finally, an automatic control strategy is given to achieve the highest COP when solar energy fluctuates.

  17. Impacts of the pumped storage power station on the wind generation integration capability of the Shandong Power Grid%抽水蓄能电站对山东电网风电接纳能力的影响

    Institute of Scientific and Technical Information of China (English)

    宋豪; 宋曙光; 王超; 刘远龙; 于大洋; 韩学山

    2011-01-01

    将抽水蓄能机组纳入机组组合问题当中,据此建立了含风电与抽水蓄能电站的系统优化运行模型。以山东电网实际系统为例,根据机组组合的结果分析了不同季节典型日下抽水蓄能电站对于风电接入电网各项指标的影响。结果表明,当风电容量较小时,抽水蓄能电站的作用不明显;只有当风电容量超出系统的接纳能力出现弃风以后,抽水蓄能电站的作用才得以体现出来,风电并网的各项指标随抽水蓄能电站容量的增加有明显的改善。%The pumped storage power station was considered in unit commitment problem.Based on this,an optimal operation model of the power system was built.The impacts of the pumped storage power station(PSPS) with different capacities to targets of grid-connected wind power in a typical day in different seasons were analyzed according to unit commitment results based on the Shandong Power Grid.The results showed that the impact was not obvious when capacity of wind power was small.The targets were improved with increasing the pumped power storage station until the capacity of wind power was so large that some wind power was abandoned.

  18. Compressed air energy storage system reservoir size for a wind energy baseload power plant

    Energy Technology Data Exchange (ETDEWEB)

    Cavallo, A.J.

    1996-12-31

    Wind generated electricity can be transformed from an intermittent to a baseload resource using an oversized wind farm in conjunction with a compressed air energy storage (CAES) system. The size of the storage reservoir for the CAES system (solution mined salt cavern or porous media) as a function of the wind speed autocorrelation time (C) has been examined using a Monte Carlo simulation for a wind class 4 (wind power density 450 W m{sup -2} at 50 m hub height) wind regime with a Weibull k factor of 2.5. For values of C typically found for winds over the US Great Plains, the storage reservoir must have a 60 to 80 hour capacity. Since underground reservoirs account for only a small fraction of total system cost, this larger storage reservoir has a negligible effect on the cost of energy from the wind energy baseload system. 7 refs., 2 figs., 1 tab.

  19. Energy storage systems: power grid and energy market use cases

    Directory of Open Access Journals (Sweden)

    Komarnicki Przemysław

    2016-09-01

    Full Text Available Current power grid and market development, characterized by large growth of distributed energy sources in recent years, especially in Europa, are according energy storage systems an increasingly larger field of implementation. Existing storage technologies, e.g. pumped-storage power plants, have to be upgraded and extended by new but not yet commercially viable technologies (e.g. batteries or adiabatic compressed air energy storage that meet expected demands. Optimal sizing of storage systems and technically and economically optimal operating strategies are the major challenges to the integration of such systems in the future smart grid. This paper surveys firstly the literature on the latest niche applications. Then, potential new use case and operating scenarios for energy storage systems in smart grids, which have been field tested, are presented and discussed and subsequently assessed technically and economically.

  20. Control Strategies to Smooth Short-Term Power Fluctuations in Large Photovoltaic Plants Using Battery Storage Systems

    Directory of Open Access Journals (Sweden)

    Javier Marcos

    2014-10-01

    Full Text Available The variations in irradiance produced by changes in cloud cover can cause rapid fluctuations in the power generated by large photovoltaic (PV plants. As the PV power share in the grid increases, such fluctuations may adversely affect power quality and reliability. Thus, energy storage systems (ESS are necessary in order to smooth power fluctuations below the maximum allowable. This article first proposes a new control strategy (step-control, to improve the results in relation to two state-of-the-art strategies, ramp-rate control and moving average. It also presents a method to quantify the storage capacity requirements according to the three different smoothing strategies and for different PV plant sizes. Finally, simulations shows that, although the moving-average (MA strategy requires the smallest capacity, it presents more losses (2–3 times more and produces a much higher number of cycles over the ESS (around 10 times more, making it unsuitable with storage technologies as lithium-ion. The step-control shown as a better option in scenery with exigent ramp restrictions (around 2%/min and distributed generation against the ramp-rate control in all ESS key aspects: 20% less of capacity, up to 30% less of losses and a 40% less of ageing. All the simulations were based on real PV production data, taken every 5 s in the course of one year (2012 from a number of systems with power outputs ranging from 550 kW to 40 MW.

  1. Analysis on Development Prospect of Pumped-storage Power Station in Guangxi%广西抽水蓄能电站的发展前景分析

    Institute of Scientific and Technical Information of China (English)

    田明俊

    2014-01-01

    ∶优化电源结构,深度开发水电、优化发展煤电、合理消纳西电、积极发展核电、因地制宜开发风电等清洁和可再生能源是实现广西电力可持续发展和“节能减排”战略目标的重要措施。抽水蓄能电站在电力系统中具有调峰填谷、调相调频和紧急事故备用等多种功能,是现代电力系统中最有效的调节工具之一,对优化电源结构、促进广西核电和风电等清洁能源的大规模发展、保障电力系统安全运行具有重要作用。%To realize power sustainable development and the strategic target of energy-saving and emission-reduc-tion, the power source structure must be optimized by vigorously developing hydropower, nuclear power, wind power and other clean and renewable energies, and scientifically developing coal power in compliance with local conditions. Pumped storage power station, as the powerful regulation tool in modern power system realizing by peak cutting and valley filling, phase and frequency modulating etc., plays a significant role in optimizing power structure, developing large-scale clean energy and in safe operation of power system of Guangxi.

  2. Expanding the potential for saline formations : modeling carbon dioxide storage, water extraction and treatment for power plant cooling.

    Energy Technology Data Exchange (ETDEWEB)

    2011-04-01

    The National Water, Energy and Carbon Sequestration simulation model (WECSsim) is being developed to address the question, 'Where in the current and future U.S. fossil fuel based electricity generation fleet are there opportunities to couple CO{sub 2} storage and extracted water use, and what are the economic and water demand-related impacts of these systems compared to traditional power systems?' The WECSsim collaborative team initially applied this framework to a test case region in the San Juan Basin, New Mexico. Recently, the model has been expanded to incorporate the lower 48 states of the U.S. Significant effort has been spent characterizing locations throughout the U.S. where CO{sub 2} might be stored in saline formations including substantial data collection and analysis efforts to supplement the incomplete brine data offered in the NatCarb database. WECSsim calculates costs associated with CO{sub 2} capture and storage (CCS) for the power plant to saline formation combinations including parasitic energy costs of CO{sub 2} capture, CO{sub 2} pipelines, water treatment options, and the net benefit of water treatment for power plant cooling. Currently, the model can identify the least-cost deep saline formation CO{sub 2} storage option for any current or proposed coal or natural gas-fired power plant in the lower 48 states. Initial results suggest that additional, cumulative water withdrawals resulting from national scale CCS may range from 676 million gallons per day (MGD) to 30,155 MGD depending on the makeup power and cooling technologies being utilized. These demands represent 0.20% to 8.7% of the U.S. total fresh water withdrawals in the year 2000, respectively. These regional and ultimately nation-wide, bottom-up scenarios coupling power plants and saline formations throughout the U.S. can be used to support state or national energy development plans and strategies.

  3. 火电、风电与抽水蓄能电站联合运行成本效益分析模型研究%Cost-benefit Analysis Model of Joint Operation of Thermal Power, Wind Power and Pumped Storage Power Station

    Institute of Scientific and Technical Information of China (English)

    安建强; 鞠立伟; 尚金成; 宋艺航; 徐隽; 张金良

    2012-01-01

    In order to solve the abandoned wind in wind power generation and reduce CO2 emissions, this article establishes joint operation of cost-benefit analysis model of thermal power, wind power and pumped storage power station. Empirical analysis finds that using pumped storage power station as an alternative to thermal power plants as wind power reserve service can absorb unused wind energy, increase the utilization efficiency of wind energy, reduce the operation of coal-fired units and CO2 emissions, which has significant environmental benefits. Taking the simulation results as target value, the sensitivity analysis of joint operation of cost-effectiveness analysis model of thermal power, wind power and pumped storage power station shows that grid-connected wind power is the sensitivity factors in reducing CO2 emissions and the profits of grid purchasing power.%为解决风能发电中的弃风问题和降低CO2的排放,提出了火电、风电与抽水蓄能电站联合运行成本效益分析模型.仿真计算结果表明,利用抽水蓄能电站替代火电厂作为风能发电的备用服务,可吸纳未被利用的风能、减少燃煤机组的使用、增加电网吸纳风电的能力、降低CO2的排放量,具有显著的环境效益.以仿真结果为目标值,对火电、风电与抽水蓄能电站联合运行成本效益分析模型进行敏感性分析发现,风电并网量是CO2减排和电网购电利润减少的敏感性因素.

  4. Thermal storage in a heat pump heated living room floor for urban district power balancing - effects on thermal comfort, energy loss and costs for residents

    NARCIS (Netherlands)

    Leeuwen, van R.P.; Wit, de J.B.; Fink, J.; Smit, G.J.M.

    2014-01-01

    For the Dutch smart grid demonstration project Meppelenergie, the effects of controlled thermal energy storage within the floor heating structure of a living room by a heat pump are investigated. Storage possibilities are constrained by room operative and floor temperatures. Simulations indicate lim

  5. Thermal storage in a heat pump heated living room floor for urban district power balancing - effects on thermal comfort, energy loss and costs for residents

    NARCIS (Netherlands)

    van Leeuwen, Richard Pieter; de Wit, J.B.; Fink, J.; Smit, Gerardus Johannes Maria

    2014-01-01

    For the Dutch smart grid demonstration project Meppelenergie, the effects of controlled thermal energy storage within the floor heating structure of a living room by a heat pump are investigated. Storage possibilities are constrained by room operative and floor temperatures. Simulations indicate lim

  6. Preliminary Thermal Modeling of HI-STORM 100 Storage Modules at Diablo Canyon Power Plant ISFSI

    Energy Technology Data Exchange (ETDEWEB)

    Cuta, Judith M.; Adkins, Harold E.

    2014-04-17

    Thermal analysis is being undertaken at Pacific Northwest National Laboratory (PNNL) in support of inspections of selected storage modules at various locations around the United States, as part of the Used Fuel Disposition Campaign of the U.S. Department of Energy, Office of Nuclear Energy (DOE-NE) Fuel Cycle Research and Development. This report documents pre-inspection predictions of temperatures for two modules at the Diablo Canyon Power Plant ISFSI identified as candidates for inspection. These are HI-STORM 100 modules of a site-specific design for storing PWR 17x17 fuel in MPC-32 canisters. The temperature predictions reported in this document were obtained with detailed COBRA-SFS models of these storage systems, with the following boundary conditions and assumptions. • storage module overpack configuration based on FSAR documentation of HI-STORM100S-218, Version B; due to unavailability of site-specific design data for Diablo Canyon ISFSI modules • Individual assembly and total decay heat loadings for each canister, based on at-loading values provided by PG&E, “aged” to time of inspection using ORIGEN modeling o Special Note: there is an inherent conservatism of unquantified magnitude – informally estimated as up to approximately 20% -- in the utility-supplied values for at-loading assembly decay heat values • Axial decay heat distributions based on a bounding generic profile for PWR fuel. • Axial location of beginning of fuel assumed same as WE 17x17 OFA fuel, due to unavailability of specific data for WE17x17 STD and WE 17x17 Vantage 5 fuel designs • Ambient conditions of still air at 50°F (10°C) assumed for base-case evaluations o Wind conditions at the Diablo Canyon site are unquantified, due to unavailability of site meteorological data o additional still-air evaluations performed at 70°F (21°C), 60°F (16°C), and 40°F (4°C), to cover a range of possible conditions at the time of the inspection. (Calculations were also performed at

  7. Entropy, pricing and productivity of pumped-storage

    Science.gov (United States)

    Karakatsanis, Georgios; Tyralis, Hristos; Tzouka, Katerina

    2016-04-01

    Pumped-storage constitutes today a mature method of bulk electricity storage in the form of hydropower. This bulk electricity storability upgrades the economic value of hydropower as it may mitigate -or even neutralize- stochastic effects deriving from various geophysical and socioeconomic factors, which produce numerous load balance inefficiencies due to increased uncertainty. Pumped-storage further holds a key role for unifying intermittent renewable (i.e. wind, solar) units with controllable non-renewable (i.e. nuclear, coal) fuel electricity generation plants into integrated energy systems. We develop a set of indicators for the measurement of performance of pumped-storage, in terms of the latter's energy and financial contribution to the energy system. More specifically, we use the concept of entropy in order to examine: (1) the statistical features -and correlations- of the energy system's intermittent components and (2) the statistical features of electricity demand prediction deviations. In this way, the macroeconomics of pumped-storage emerges naturally from its statistical features (Karakatsanis et al. 2014). In addition, these findings are combined to actual daily loads. Hence, not only the amount of energy harvested from the pumped-storage component is expected to be important, but the harvesting time as well, as the intraday price of electricity varies significantly. Additionally, the structure of the pumped-storage market proves to be a significant factor as well for the system's energy and financial performance (Paine et al. 2014). According to the above, we aim at postulating a set of general rules on the productivity of pumped-storage for (integrated) energy systems. Keywords: pumped-storage, storability, economic value of hydropower, stochastic effects, uncertainty, energy systems, entropy, intraday electricity price, productivity References 1. Karakatsanis, Georgios et al. (2014), Entropy, pricing and macroeconomics of pumped-storage systems

  8. 含风电场系统风电与抽水蓄能匹配容量研究%RESEARCH ON OPTIMAL CAPACITY BETWEEN WIND POWER AND PUMPED-STORAGE POWER STATION

    Institute of Scientific and Technical Information of China (English)

    王睿; 张粒子; 张丽娟; 徐利美

    2012-01-01

    Based on integrated policy and planning research, an optimization model was executed by genetic algorithm , which combines setting the maximization of social benefits as objective function and studying the optimal capacity of wind power and pumped-storage power station. The simulation results indicate that it can promote the development of wind power and improve the energy utilization efficiency of power systems. The way has practical significance for ascertaining optimize capacity of wind power and pumped-storage power station.%基于宏观层面政策、规划研究应用的研究定位,以社会效益最大化为目标建立风电-抽水蓄能联合运行优化模型,研究含风电场系统风电与抽水蓄能的最优匹配容量问题,并采用嵌套式遗传算法进行优化仿真分析,仿真结果表明风电与抽水蓄能的合理配置可促进风电发展,实现社会效益的显著提高.该文给出的确定风电与抽水蓄能最优匹配容量的方法具有一定的实践意义.

  9. New materials for thermal energy storage in concentrated solar power plants

    Science.gov (United States)

    Guerreiro, Luis; Collares-Pereira, Manuel

    2016-05-01

    Solar Thermal Electricity (STE) is an important alternative to PV electricity production, not only because it is getting more cost competitive with the continuous growth in installed capacity, engineering and associated innovations, but also, because of its unique dispatch ability advantage as a result of the already well established 2-tank energy storage using molten salts (MS). In recent years, research has been performed, on direct MS systems, to which features like modularity and combinations with other (solid) thermal storage materials are considered with the goal of achieving lower investment cost. Several alternative materials and systems have been studied. In this research, storage materials were identified with thermo-physical data being presented for different rocks (e.g. quartzite), super concrete, and other appropriate solid materials. Among the new materials being proposed like rocks from old quarries, an interesting option is the incorporation of solid waste material from old mines belonging to the Iberian Pyritic Belt. These are currently handled as byproducts of past mine activity, and can potentially constitute an environmental hazard due to their chemical (metal) content. This paper presents these materials, as part of a broad study to improve the current concept of solar energy storage for STE plants, and additionally presents a potentially valuable solution for environmental protection related to re-use of mining waste.

  10. Frequency-Adaptive Modified Comb-Filter-Based Phase-Locked Loop for a Doubly-Fed Adjustable-Speed Pumped-Storage Hydropower Plant under Distorted Grid Conditions

    Directory of Open Access Journals (Sweden)

    Wei Luo

    2017-05-01

    Full Text Available The control system of a doubly-fed adjustable-speed pumped-storage hydropower plant needs phase-locked loops (PLLs to obtain the phase angle of grid voltage. The main drawback of a comb-filter-based phase-locked loop (CF-PLL is the slow dynamic response. This paper presents a modified comb-filter-based phase-locked loop (MCF-PLL by improving the pole-zero pattern of the comb filter, and gives the parameters’ setting method of the controller, based on the discrete model of MCF-PLL. In order to improve the disturbance resistibility of MCF-PLL when the power grid’s frequency changes, this paper proposes a frequency-adaptive modified, comb-filter-based, phase-locked loop (FAMCF-PLL and its digital implementation scheme. Experimental results show that FAMCF-PLL has good steady-state and dynamic performance under distorted grid conditions. Furthermore, FAMCF-PLL can determine the phase angle of the grid voltage, which is locked when it is applied to a doubly-fed adjustable-speed pumped-storage hydropower experimental platform.

  11. Evaluation of annual efficiencies of high temperature central receiver concentrated solar power plants with thermal energy storage.

    Energy Technology Data Exchange (ETDEWEB)

    Ehrhart, Brian David; Gill, David Dennis

    2013-07-01

    The current study has examined four cases of a central receiver concentrated solar power plant with thermal energy storage using the DELSOL and SOLERGY computer codes. The current state-of-the-art base case was compared with a theoretical high temperature case which was based on the scaling of some input parameters and the estimation of other parameters based on performance targets from the Department of Energy SunShot Initiative. This comparison was done for both current and high temperature cases in two configurations: a surround field with an external cylindrical receiver and a north field with a single cavity receiver. There is a fairly dramatic difference between the design point and annual average performance, especially in the solar field and receiver subsystems, and also in energy losses due to the thermal energy storage being full to capacity. Additionally, there are relatively small differences (<2%) in annual average efficiencies between the Base and High Temperature cases, despite an increase in thermal to electric conversion efficiency of over 8%. This is due the increased thermal losses at higher temperature and operational losses due to subsystem start-up and shut-down. Thermal energy storage can mitigate some of these losses by utilizing larger thermal energy storage to ensure that the electric power production system does not need to stop and re-start as often, but solar energy is inherently transient. Economic and cost considerations were not considered here, but will have a significant impact on solar thermal electric power production strategy and sizing.

  12. Numerical Modeling of the Effect of Thawing of Soil in the Area of Placing Tanks for Storage Fuel of Thermal Power Plants and Boiler

    Directory of Open Access Journals (Sweden)

    Polovnikov V.Yu.

    2016-01-01

    Full Text Available This paper describes the numerical modeling of heat transfer in the area placing of the tank for storage fuel of thermal power plant and boiler with considering the influence of thawing of the soil. We have established that the thawing of the soil in the area of placing of the tank for storage fuel of thermal power plant and boiler have little effect on the change of heat loss.

  13. Thermal Mode of Tanks for Storage Fuel of Thermal Power Plants and Boiler with the Influence of Engineering Facilities in the Area of their Placement

    Science.gov (United States)

    Polovnikov, V. Yu.; Makhsutbek, F. T.; Ozhikenova, Zh. F.

    2016-02-01

    This paper describes the numerical modeling of heat transfer in the area placing of the tank for storage fuel of thermal power plant and boiler with the influence of engineering construction. We have established that the presence of engineering structures in the area of placing of the tank for storage fuel of thermal power plant and boiler have little effect on the change of heat loss.

  14. A Three-Part Electricity Price Mechanism for Photovoltaic-Battery Energy Storage Power Plants Considering the Power Quality and Ancillary Service

    Directory of Open Access Journals (Sweden)

    Yajing Gao

    2017-08-01

    Full Text Available To solve the problem of solar abandoning, which is accompanied by the rapid development of photovoltaic (PV power generation, a demonstration of a photovoltaic-battery energy storage system (PV-BESS power plant has been constructed in Qinghai province in China. However, it is difficult for the PV-BESS power plant to survive and develop with the current electricity price mechanism and subsidy policy. In this paper, a three-part electricity price mechanism is proposed based on a deep analysis of the construction and operation costs and economic income. The on-grid electricity price is divided into three parts: the capacity price, graded electricity price, and ancillary service price. First, to ensure that the investment of the PV-BESS power plant would achieve the industry benchmark income, the capacity price and benchmark electricity price are calculated using the discounted cash flow method. Then, the graded electricity price is calculated according to the grade of the quality of grid-connected power. Finally, the ancillary service price is calculated based on the graded electricity price and ancillary service compensation. The case studies verify the validity of the three-part electricity price mechanism. The verification shows that the three-part electricity price mechanism can help PV-BESS power plants to obtain good economic returns, which can promote the development of PV-BESS power plants.

  15. A Novel Pumped Hydro Combined with Compressed Air Energy Storage System

    OpenAIRE

    Erren Yao; Xinbing Wang; Liqin Wang; Huanran Wang

    2013-01-01

    A novel pumped hydro combined with compressed air energy storage (PHCA) system is proposed in this paper to resolve the problems of bulk energy storage in the wind power generation industry over an area in China, which is characterised by drought and water shortages. Thermodynamic analysis of the energy storage system, which focuses on the pre-set pressure, storage volume capacity, water air volume ratio, pump performance, and water turbine performance of the storage system, is also presented...

  16. The conflict-prone relation hydroelectric power contra environmental protection. Legal control options between interests of hydropower utilization and environmental concerns under special consideration of the so-called pumped-storage power plant; Das Konfliktverhaeltnis Wasserkraft contra Umweltschutz. Rechtliche Steuerungsmoeglichkeiten zwischen Wasserkraftnutzungsinteressen und Umweltschutzbelangen unter besonderer Beruecksichtigung des sog. Pumpspeicherkraftwerks

    Energy Technology Data Exchange (ETDEWEB)

    Lauer, Kristina

    2012-07-01

    The author of the contribution under consideration evaluates the conflict-prone relationship between hydroelectric power and environmental protection on European, German and Swiss level. The author investigates the possibility whether the Union legal regulations or the constitutional regulations of the Basic Law and the Federal Constitution of Switzerland as well as the simple legal regulation of the Federal Act of the Protection of Nature, Water Resources Act, Construction Law, Renewable Energy Law, and the Swiss Law an Water Pollution Control may contribute to the solution of this conflict-prone relationship.

  17. Numerical investigation of the cavitational behaviour into a storage pump at off design operating points

    Energy Technology Data Exchange (ETDEWEB)

    Stuparu, A; Susan-Resiga, R; Anton, L E [Department of Hydraulic Machinery, Politehnica University of Timisoara, Bd. Mihai Viteazu 1, Timisoara, 300222 (Romania); Muntean, S, E-mail: astuparu@mh.mec.upt.r [Centre of Advanced Research in Engineering Science, Romanian Academy-Timisoara Branch, Bd. Mihai Viteazu 24, Timisoara, 300223 (Romania)

    2010-08-15

    The paper presents a new method for the analysis of the cavitational behaviour of hydraulic turbomachines. This new method allows determining the coefficient of the cavitation inception and the cavitation sensitivity of the turbomachines. We apply this method to study the cavitational behaviour of a large storage pump. By plotting in semi-logarithmic coordinates the vapour volume versus the cavitation coefficient, we show that all numerical data collapse in an exponential manner. This storage pump is located in a power plant and operating without the presence of the developed cavitation is vital. We investigate the behaviour of the pump from the cavitational point of view while the pump is operating for variable discharge. A distribution of the vapour volume upon the blade of the impeller is presented for all the four operating points. It can be seen how the volume of vapour evolves from one operating point to another. In order to study the influence of the cavitation phenomena upon the pump, the evolution of the pumping head against the cavitation coefficient is presented. That will show how the pumping head drops while the cavitation coefficient decreases. From analysing the data obtained from the numerical simulation it results that the cavitation phenomena is present for all the investigated operating points. By analysis of the slope of the curve describing the evolution of the vapour volume against the cavitation coefficient we determine the cavitation sensitivity of the pump for each operating point. It is showed that the cavitation sensitivity of the investigated storage pump increases while the flow rate decreases.

  18. Multi-objective optimization of combined operation of power station with wind power and pumped water power storage%风电-抽水蓄能电站联合运行的多目标优化

    Institute of Scientific and Technical Information of China (English)

    王晓兰; 李志伟

    2011-01-01

    In order to make full utilization of wind energy, and improve the output characteristics of wind farm, a optimization model of combined power supply system with wind power and pumped water power storage was established. The maximum benefit from this system and the smoothness of the output power of this system were taken as the optimization object and by using the multi-objective clonal selection algorithm, the solution and simulation analysis of this model were performed. The operation effectiveness of the system was improved by means of optimization and at the same time, the smoothness of the output power obtained. By using wind power forecasting and foregoing optimization, the dispatching values of either part in this system could be obtained for daily forecast of the combined operation.%为了充分利用风能,改善风电场的功率输出特性,建立风电场-抽水蓄能联合供电系统的优化模型.以联合运行系统的效益最大和输出功率平滑为优化目标,采用多目标克隆选择算法,对模型进行求解和仿真分析.通过优化计算使风电-抽水蓄能联合运行系统在提高运行效益的同时,输出功率得到平滑.应用风电场功率预测技术,通过上述优化,可以得到预测日联合运行系统各部分的优化功率调度值.

  19. Reducing the Cost of Thermal Energy Storage for Parabolic Trough Solar Power Plants

    Energy Technology Data Exchange (ETDEWEB)

    Gawlik, Keith

    2013-06-25

    Thermal energy storage systems using phase change materials were evaluated for trough systems that use oil, steam, and high temperature salts as heat transfer fluids. A variety of eutectic salts and metal alloys were considered as phase change materials in a cascaded arrangement. Literature values of specific heat, latent heat, density, and other thermophysical properties were used in initial analyses. Testing laboratories were contracted to measure properties for candidate materials for comparison to the literature and for updating the models. A TRNSYS model from Phase 1 was further developed for optimizing the system, including a novel control algorithm. A concept for increasing the bulk thermal conductivity of the phase change system was developed using expanded metal sheets. Outside companies were contracted to design and cost systems using platecoil heat exchangers immersed in the phase change material. Laboratory evaluations of the one-dimensional and three-dimensional behavior of expanded metal sheets in a low conductivity medium were used to optimize the amount of thermal conductivity enhancement. The thermal energy storage systems were compared to baseline conventional systems. The best phase change system found in this project, which was for the high temperature plant, had a projected cost of $25.2 per kWhth, The best system also had a cost that was similar to the base case, a direct two-tank molten salt system.

  20. Energetic and exergetic analysis of Rankine cycles for solar power plants with parabolic trough and thermal storage

    Directory of Open Access Journals (Sweden)

    Cenuşă Victor-Eduard

    2016-01-01

    Full Text Available The paper analyzes the “secondary” circuit (for thermodynamic conversion of a Concentrated Solar Power (CSP plant with thermodynamic cycle, whose mirrors field supplies a thermal power, averaged over a sunny day, of about 100 MW heat. We study the case of parabolic trough solar collector using silicone oil in the “primary” circuit, which limits the peak temperature below 400 °C. The “primary” circuit uses thermal storage, allowing a delay between the power generation in rapport with the solar energy capture. We choose a water-steam cycle, type Hirn. For increasing its efficiency, it has regenerative feed water preheating and steam reheating. We compared, energetic and exergetic, two types of cycles, using a numerical model with iterative structure, developed by the authors. The results showed that the simplified design achieves practically the same thermodynamic performances with the advanced one.

  1. Plant proton pumps

    DEFF Research Database (Denmark)

    Gaxiola, Roberto A.; Palmgren, Michael Gjedde; Schumacher, Karin

    2007-01-01

    Chemiosmotic circuits of plant cells are driven by proton (H+) gradients that mediate secondary active transport of compounds across plasma and endosomal membranes. Furthermore, regulation of endosomal acidification is critical for endocytic and secretory pathways. For plants to react to their co......Chemiosmotic circuits of plant cells are driven by proton (H+) gradients that mediate secondary active transport of compounds across plasma and endosomal membranes. Furthermore, regulation of endosomal acidification is critical for endocytic and secretory pathways. For plants to react...

  2. Research and development of CO2 Capture and Storage Technologies in Fossil Fuel Power Plants

    Directory of Open Access Journals (Sweden)

    Lukáš Pilař

    2012-01-01

    Full Text Available This paper presents the results of a research project on the suitability of post-combustion CCS technology in the Czech Republic. It describes the ammonia CO2 separation method and its advantages and disadvantages. The paper evaluates its impact on the recent technology of a 250 MWe lignite coal fired power plant. The main result is a decrease in electric efficiency by 11 percentage points, a decrease in net electricity production by 62 MWe, and an increase in the amount of waste water. In addition, more consumables are needed.

  3. Efficiency improvement for wind energy pumped storage systems

    DEFF Research Database (Denmark)

    Forcos, A.; Marinescu, C.; Teodorescu, Remus

    2011-01-01

    Integrating wind energy into the grid may raise stability problems. Solutions for avoiding these situations are studied and energy storage methods are suitable for balancing the energy between the wind turbine and grid. In this paper, an autonomous wind turbine pumped storage system is presented....... The focus of this paper is to improve the efficiency of this system, which is small at low power levels. The driving motorpump group of the storage system is the key point presented in this paper for efficiency improving. Two control methods, experimentally implemented for induction machine are presented...

  4. Operation of the counter-rotating type pump-turbine unit installed in the power stabilizing system

    Science.gov (United States)

    Kanemoto, T.; Honda, H.; Kasahara, R.; Miyaji, T.

    2014-03-01

    This serial research intends to put a unique power stabilization system with a pumped storage into practical use. The pumped storage is equipped with a counter-rotating type pump-turbine unit whose operating mode can be shifted instantaneously in response to the fluctuation of power from renewable resources. This paper verifies that the system is reasonably effective to stabilize the fluctuating power. It is necessary to quickly increase the rotational speed when the operation is shifted from the turbine to the pumping modes, because the unit cannot pump-up water from a lower reservoir at a slow rotational speed while keeping gross/geodetic head constant. The maximum hydraulic efficiency at the turbine mode is close to the efficiency of the counter-rotating type hydroelectric unit designed exclusively for the turbine mode. The system is also provided for a pilot plant to be operated in the field.

  5. Evaluating the Technical and Economic Performance of PV Plus Storage Power Plants: Report Summary

    Energy Technology Data Exchange (ETDEWEB)

    Denholm, Paul L. [National Renewable Energy Laboratory (NREL), Golden, CO (United States); Margolis, Robert M. [National Renewable Energy Laboratory (NREL), Golden, CO (United States); Eichman, Joshua D. [National Renewable Energy Laboratory (NREL), Golden, CO (United States)

    2017-08-28

    The decreasing costs of both PV and energy storage technologies have raised interest in the creation of combined PV plus storage systems to provide dispatchable energy and reliable capacity. In this study, we examine the tradeoffs among various PV plus storage configurations and quantify the impact of configuration on system net value.

  6. Evaluating the Technical and Economic Performance of PV Plus Storage Power Plants

    Energy Technology Data Exchange (ETDEWEB)

    Denholm, Paul L. [National Renewable Energy Lab. (NREL), Golden, CO (United States); Margolis, Robert M. [National Renewable Energy Lab. (NREL), Golden, CO (United States); Eichman, Joshua D. [National Renewable Energy Lab. (NREL), Golden, CO (United States)

    2017-08-17

    The decreasing costs of both PV and energy storage technologies have raised interest in the creation of combined PV plus storage systems to provide dispatchable energy and reliable capacity. In this study, we examine the tradeoffs among various PV plus storage configurations and quantify the impact of configuration on system net value.

  7. Heat-Powered Pump for Liquid Metals

    Science.gov (United States)

    Campana, R. J.

    1986-01-01

    Proposed thermoelectromagnetic pump for liquid metal powered by waste heat; needs no battery, generator, or other external energy source. Pump turns part of heat in liquid metal into pumping energy. In combination with primary pump or on its own, thermoelectric pump circulates coolant between reactor and radiator. As long as there is decay heat to be removed, unit performs function.

  8. Heat-Powered Pump for Liquid Metals

    Science.gov (United States)

    Campana, R. J.

    1986-01-01

    Proposed thermoelectromagnetic pump for liquid metal powered by waste heat; needs no battery, generator, or other external energy source. Pump turns part of heat in liquid metal into pumping energy. In combination with primary pump or on its own, thermoelectric pump circulates coolant between reactor and radiator. As long as there is decay heat to be removed, unit performs function.

  9. 风电-火电-抽水蓄能联合优化机组组合模型%Unit Commitment Model for Combined Optimization of Wind Power-Thermal Power-Pumped Storage Hydro

    Institute of Scientific and Technical Information of China (English)

    刘芳; 潘毅; 杨军峰; 周劼英; 周京阳; 朱泽磊; 李强

    2015-01-01

    大规模间歇式能源出力的不确定性给电网的安全经济运行提出新的挑战,研究间歇式能源接入下的多源联合优化机组组合模型对提高电网运行的安全性和促进间歇式能源的消纳具有重要意义。基于对风电不确定性及抽水蓄能运行机理分析,采用置信区间法进行风电不确定性建模,并提出新的系统调节能力约束,从而建立了考虑风电不确定性影响及抽蓄水头变化影响的联合优化机组组合模型。采用6节点系统验证模型的有效性,研究了抽蓄容量及置信区间选择对发电成本、机组组合及其可靠性的影响。结果显示,风电、火电装机不变的情况下,要保证机组组合的可靠性达99%以上,抽蓄发电装机占比分别为5.6%和10.5%时,与无抽蓄时相比可以分别减少16和17个开机时段,发电成本可以分别降低4.6%和6.8%。通过算例的论证,表明该机组组合模型能够实现多元能源的协调优化和给定置信区间内的风电的有效消纳。%The uncertainty of large-scale intermittent energy poses new challenges to grid operation, it is important to study unit commitment model for combined optimization of multi-source with intermittent energy to improve operation security and promote the utilization of intermittent energy. Based on analysis of the uncertainty of wind power and operational mechanism of pumped storage, this paper used confidence interval method to model the uncertainty, and proposed new constraints about system adjustment ability to establish unit commitment model considering wind power’s uncertainty and changes in pumped storage water head. This paper used a 6-node system to verify effectiveness of the model, and studied the impacts of pumped storage capacity and confidence interval on generation cost, unit commitment and its reliability. When the installed capacity of both wind and thermal power is fixed and the reliability of unit

  10. 78 FR 25263 - Eagle Mountain Pumped Storage Hydroelectric Project; Eagle Crest Energy; Notice of Meeting With...

    Science.gov (United States)

    2013-04-30

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Eagle Mountain Pumped Storage Hydroelectric Project; Eagle Crest Energy... Power Act), on the Eagle Mountain Pumped Storage Hydroelectric Project. e. All local, state, and...

  11. 77 FR 43280 - Eagle Mountain Pumped Storage Hydroelectric Project, Eagle Crest Energy; Notice of Meeting With...

    Science.gov (United States)

    2012-07-24

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Eagle Mountain Pumped Storage Hydroelectric Project, Eagle Crest Energy... Management Act and the Federal Power Act), on the Eagle Mountain Pumped Storage Hydroelectric Project. e....

  12. Emptying of the Storage for Solid Radioactive Waste in the Greifswald Nuclear Power Plant

    Energy Technology Data Exchange (ETDEWEB)

    Hartmann, B.; Fischer, J.

    2002-02-26

    On the Greifswald site, 8 WWER 440 reactor units are located and also several facilities to handle fuel and radwaste. After the reunification of Germany, the final decision was taken to decommission all these Russian designed reactors. Thus, EWN is faced with a major decommissioning project in the field of nuclear power stations. One of the major tasks before the dismantling of the plant is the complete disposal of the operational waste. Among other facilities, a store for solid radioactive waste is located on the site, which has been filled over 17 years of operation of units 1 to 4. The paper presents the disposal technology development and results achieved. This activity is the first project in the operational history of the Russian type serial reactor line WWER-440.

  13. Emptying of the Storage for Solid Radioactive Waste in the Greifswald Nuclear Power Plant

    Energy Technology Data Exchange (ETDEWEB)

    Hartmann, B.; Fischer, J.

    2002-02-26

    On the Greifswald site, 8 WWER 440 reactor units are located and also several facilities to handle fuel and radwaste. After the reunification of Germany, the final decision was taken to decommission all these Russian designed reactors. Thus, EWN is faced with a major decommissioning project in the field of nuclear power stations. One of the major tasks before the dismantling of the plant is the complete disposal of the operational waste. Among other facilities, a store for solid radioactive waste is located on the site, which has been filled over 17 years of operation of units 1 to 4. The paper presents the disposal technology development and results achieved. This activity is the first project in the operational history of the Russian type serial reactor line WWER-440.

  14. Sustainability Assessment of Coal-Fired Power Plants with Carbon Capture and Storage

    Energy Technology Data Exchange (ETDEWEB)

    Widder, Sarah H.; Butner, R. Scott; Elliott, Michael L.; Freeman, Charles J.

    2011-11-30

    Carbon capture and sequestration (CCS) has the ability to dramatically reduce carbon dioxide (CO2) emissions from power production. Most studies find the potential for 70 to 80 percent reductions in CO2 emissions on a life-cycle basis, depending on the technology. Because of this potential, utilities and policymakers are considering the wide-spread implementation of CCS technology on new and existing coal plants to dramatically curb greenhouse gas (GHG) emissions from the power generation sector. However, the implementation of CCS systems will have many other social, economic, and environmental impacts beyond curbing GHG emissions that must be considered to achieve sustainable energy generation. For example, emissions of nitrogen oxides (NOx), sulfur oxides (SOx), and particulate matter (PM) are also important environmental concerns for coal-fired power plants. For example, several studies have shown that eutrophication is expected to double and acidification would increase due to increases in NOx emissions for a coal plant with CCS provided by monoethanolamine (MEA) scrubbing. Potential for human health risks is also expected to increase due to increased heavy metals in water from increased coal mining and MEA hazardous waste, although there is currently not enough information to relate this potential to actual realized health impacts. In addition to environmental and human health impacts, supply chain impacts and other social, economic, or strategic impacts will be important to consider. A thorough review of the literature for life-cycle analyses of power generation processes using CCS technology via the MEA absorption process, and other energy generation technologies as applicable, yielded large variability in methods and core metrics. Nonetheless, a few key areas of impact for CCS were developed from the studies that we reviewed. These are: the impact of MEA generation on increased eutrophication and acidification from ammonia emissions and increased toxicity

  15. Economic analysis of pumped-storage unit in electricity system with multi-type power sources%多元电力系统中抽水蓄能的经济性问题研究

    Institute of Scientific and Technical Information of China (English)

    王晓晖; 张粒子; 程世军

    2014-01-01

    This paper proposes an approach to evaluate the economics of pumped-storage units from the perspective of a multi-type power system. An MIP-based unit commitment model with various types of power sources is established, which integrates thermal, CCGT, hydro, wind, nuclear with pumped-storage units. Based on the model, the net present value of pumped-storage per megawatt is calculated. By comparing the net present value with the capital cost per megawatt, the economic evaluation of pumped-storage unit is conducted. The case study proves the feasibility of the model and the above approach. Furthermore, this paper analyzes the influence on the economic results of pumped-storage units by the change of peak-valley difference of the system load, the regulating range of thermal units, the capacity of nuclear and wind power, and the thermal-hydro proportion. The case study shows that the economics of pumped-storage is most influenced by the change of the capacity of nuclear and wind power and the thermal-hydro proportion.%提出了从多元电力系统的角度对抽水蓄能进行经济性分析的方法。基于混合整数规划构建了含火电、CCGT、水电、风电、核电、抽水蓄能等各类电源的多元电力系统机组组合模型。采用该模型计算抽水蓄能单位容量的收益现值,并与单位容量的投资成本比较以分析其经济性。算例测试的结果证明了模型和方法的可行性。在此基础上,进一步研究了负荷侧的峰谷差率、电源侧的风电容量、水火电比例、核电容量和火电调节范围变化对抽水蓄能经济性的影响。算例结果显示,水火电比例、风电容量以及核电容量的变化对抽水蓄能的经济性的影响较大。

  16. NDE of copper canisters for long-term storage of spent nuclear fuel from the Swedish nuclear power plants

    Science.gov (United States)

    Stepinski, Tadeusz

    2003-07-01

    Sweden has been intensively developing methods for long term storage of spent fuel from the nuclear power plants for twenty-five years. A dedicated research program has been initiated and conducted by the Swedish company SKB (Swedish Nuclear Fuels and Waste Management Co.). After the interim storage SKB plans to encapsulate spent nuclear fuel in copper canisters that will be placed at a deep repository located in bedrock. The canisters filled with fuel rods will be sealed by an electron beam weld. This paper presents three complementary NDE techniques used for assessing the sealing weld in copper canisters, radiography, ultrasound, and eddy current. A powerful X-ray source and a digital detector are used for the radiography. An ultrasonic array system consisting of a phased ultrasonic array and a multi-channel electronics is used for the ultrasonic examination. The array system enables electronic focusing and rapid electronic scanning eliminating the use of a complicated mechanical scanner. A specially designed eddy current probe capable of detecting small voids at the depth up to 4 mm in copper is used for the eddy current inspection. Presently, all the NDE techniques are verified in SKB's Canister Laboratory where full scale canisters are welded and examined.

  17. Advanced Pumped Storage Hydropower and Ancillary Services Provision

    Energy Technology Data Exchange (ETDEWEB)

    Muljadi, Eduard; Gevorgian, Vahan; Mohanpurkar, Manish; Luo, Yusheng; Hovsapian, Rob; Koritarov, Vladimir

    2017-07-12

    This paper presents a high-level overview of the capability of advanced pumped storage hydropower to provide ancillary services including frequency regulation and oscillation damping. Type 3 and Type 4 generators are discussed. The examples given are for a small power system that uses a diesel generator as the main generator and a very large system that uses a gas turbine as the main generator.

  18. Influence of wind power, plug-in electric vehicles, and heat storages on power system investments

    DEFF Research Database (Denmark)

    Kiviluoma, Juha; Meibom, Peter

    2010-01-01

    electric vehicles. The model runs in an hourly time scale in order to accommodate the impact of variable power production from wind power. Electric vehicles store electricity for later use and can thus serve to increase the flexibility of the power system. Flexibility can also be upgraded by using heat...... storages with heat from heat pumps, electric heat boilers and combined heat and power (CHP) plants. Results show that there is great potential for additional power system flexibility in the production and use of heat.......Due to rising fuel costs, the substantial price for CO2 emissions and decreasing wind power costs, wind power might become the least expensive source of power for an increasing number of power systems. This poses the questions of how wind power might change optimal investments in other forms...

  19. Experimental analysis of a solar assisted absorption heat pump with earth seasonal storage

    Energy Technology Data Exchange (ETDEWEB)

    Lazzarin, R.M.

    A plant composed of an energy roof, a seasonal earth storage and an absorption heat pump has been tested. The purpose was to study the behaviour of the various components and their interaction. The surveys were carried out over a two year period. The following operations were considered: the charging of the earth storage by the energy roof and the working of an absorption heat pump connected either to the energy roof or to the earth storage.

  20. Wind-driven stand-alone DFIG with battery and pumped hydro storage system

    Indian Academy of Sciences (India)

    K NAVIN SAM; N KUMARESAN; N AMMASAI GOUNDEN

    2017-02-01

    A wind-driven doubly fed induction generator (DFIG) along with the battery and pumped hydro storage plant (PHSP) has been devised for supplying isolated loads. PHSP-based storage system is economical and viable for the MW level wind-turbine system. The proposed scheme employs a squirrel-cage induction machine (SCIM) coupled with reversible pump turbine for PHSP. The battery storage is also included in this system to cope up with the intermittent nature of wind and fast-changing load. A simple control strategy has been implemented for maintaining the set values of voltage magnitude and frequency at the stator terminals of DFIG, which serve as a virtual grid for connecting ac loads and SCIM. Based on the availability of power in the wind, PHSP and battery, various operating modes of the proposed system have been clearly identified forsupplying the isolated loads. These operating modes are clearly demonstrated through the analysis developed for this purpose and validated through experimental results. The salient features of the proposed system over the existing stand-alone wind-driven generators are (i) structural simplicity, i.e., employing only one power electronic converter, (ii) wide speed operation of wind-driven DFIG, (iii) reduced battery capacity, (iv) high energy storage using PHSP and (v) availability of continuous power to the isolated loads.

  1. A Novel Pumped Hydro Combined with Compressed Air Energy Storage System

    Directory of Open Access Journals (Sweden)

    Erren Yao

    2013-03-01

    Full Text Available A novel pumped hydro combined with compressed air energy storage (PHCA system is proposed in this paper to resolve the problems of bulk energy storage in the wind power generation industry over an area in China, which is characterised by drought and water shortages. Thermodynamic analysis of the energy storage system, which focuses on the pre-set pressure, storage volume capacity, water air volume ratio, pump performance, and water turbine performance of the storage system, is also presented. This paper discovers how such parameters affect the performance of the whole system. The ideal performance of this novel system has the following advantages: a simple, highly effective and low cost structure, which is comparable to the efficiency of a traditional pumped hydro storage system. Research results show a great solution to the current storage constraints encountered in the development of the wind power industry in China, which have been widely recognised as a bottleneck in the wind energy storage industry.

  2. The Corrosion and Protection of Circulating Water Pump in Nuclear Power Plant%核电厂循环水泵腐蚀与防护

    Institute of Scientific and Technical Information of China (English)

    李伟光; 赵万祥; 王佳栋; 孔全兴

    2014-01-01

    It Was simple analysed Based on the corrosion events of the circulating water pump occurring in some nuclear power plant, summarized the main corrosion types, and it was given relevant suggestion of corrosion and protection , it was provided the necessary technical and services support of the circulating pump maintenance for the subsequent serviced and refomed.%通过对某核电厂循环水泵出现的腐蚀事件进行简单的分析,总结其主要的腐蚀类型,并给出腐蚀与防护相关建议,为后续循环水泵维修和改造提供必要的技术和服务支持。

  3. Frequency Conversion Modification of Supply Water Pump Motor in Thermal Power Plant%火电厂补给水泵电机变频改造

    Institute of Scientific and Technical Information of China (English)

    胡振中; 陈昊

    2016-01-01

    In this paper, based on the current situation of the power plant supply water system, this paper puts forward that the equipment can improve the safety, stability and economic operation through the frequency conversion modification of the supply pump motor.%文章基于火电厂补给水系统运行现状,提出通过对补给水泵电机进行变频改造,设备在安全、稳定、经济运行等方面均可提高。

  4. Diagnosis of feed water, condensate and circulation pumps in electric power plants; Diagnostico de bombas de agua de alimentacion, condensado y circulacion en centrales termoelectricas

    Energy Technology Data Exchange (ETDEWEB)

    Colin Castellanos, Carlos [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1991-12-31

    This article encompasses the analysis and the diagnosis of the pump`s performance that belong to the feed water, condensate and circulation systems of a fossil fuel power plant (FFPP). For this analysis pressure, temperature and flow data were collected by means of field installed instrumentation, as well as these pumps` motors current consumption and voltage values. Later on, the capacity and the pump efficiency are calculated and compared with the design values, to obtain the actual performance of the equipment with the aid of their characteristic curves (Q vs {Delta}H, Q vs {pi}, etc.). [Espanol] Este articulo comprende el analisis y el diagnostico de comportamiento de las bombas, las cuales forman parte de los sistemas de agua de alimentacion, condensado y circulacion de una central termoelectrica (CT). Para el analisis se recopilan datos de presion, temperatura y flujo de la instrumentacion instalada en campo, asi como de los valores de consumo de corriente y de voltaje en los motores de dichas bombas. Posteriormente, se calcula la capacidad y la eficiencia de las bombas en operacion real y se comparan con los valores de diseno, para obtener el comportamiento real del equipo con ayuda de las curvas caracteristicas (Q vs {Delta}H, Q vs {pi}, etcetera).

  5. 76 FR 10578 - Cuffs Run Pumped Storage, LLC; Notice of Preliminary Permit Application Accepted for Filing and...

    Science.gov (United States)

    2011-02-25

    ... Energy Regulatory Commission Cuffs Run Pumped Storage, LLC; Notice of Preliminary Permit Application... 18, 2010, Cuffs Run Pumped Storage, LLC filed an application for a preliminary permit, pursuant to section 4(f) of the Federal Power Act, proposing to study the feasibility of the Cuffs Run Pumped...

  6. Entropy, pumped-storage and energy system finance

    Science.gov (United States)

    Karakatsanis, Georgios

    2015-04-01

    Pumped-storage holds a key role for integrating renewable energy units with non-renewable fuel plants into large-scale energy systems of electricity output. An emerging issue is the development of financial engineering models with physical basis to systematically fund energy system efficiency improvements across its operation. A fundamental physically-based economic concept is the Scarcity Rent; which concerns the pricing of a natural resource's scarcity. Specifically, the scarcity rent comprises a fraction of a depleting resource's full price and accumulates to fund its more efficient future use. In an integrated energy system, scarcity rents derive from various resources and can be deposited to a pooled fund to finance the energy system's overall efficiency increase; allowing it to benefit from economies of scale. With pumped-storage incorporated to the system, water upgrades to a hub resource, in which the scarcity rents of all connected energy sources are denominated to. However, as available water for electricity generation or storage is also limited, a scarcity rent upon it is also imposed. It is suggested that scarcity rent generation is reducible to three (3) main factors, incorporating uncertainty: (1) water's natural renewability, (2) the energy system's intermittent components and (3) base-load prediction deviations from actual loads. For that purpose, the concept of entropy is used in order to measure the energy system's overall uncertainty; hence pumped-storage intensity requirements and generated water scarcity rents. Keywords: pumped-storage, integration, energy systems, financial engineering, physical basis, Scarcity Rent, pooled fund, economies of scale, hub resource, uncertainty, entropy Acknowledgement: This research was funded by the Greek General Secretariat for Research and Technology through the research project Combined REnewable Systems for Sustainable ENergy DevelOpment (CRESSENDO; grant number 5145)

  7. Leaching of Major and Minor Elements during the Transport and Storage of Coal Ash Obtained in Power Plant

    Directory of Open Access Journals (Sweden)

    Rada Krgović

    2014-01-01

    Full Text Available In power plant, coal ash obtained by combustion is mixed with river water and transported to the dump. Sequential extraction was used in order to assess pollution caused by leaching of elements during ash transport through the pipeline and in the storage (cassettes. A total of 80 samples of filter ash as well as the ash from active (currently filled and passive (previously filled cassettes were studied. Samples were extracted with distilled water, ammonium acetate, ammonium oxalate/oxalic acid, acidic solution of hydrogen-peroxide, and a hydrochloric acid. Concentrations of the several elements (Al, As, Cd, Co, Cu, Cr, Fe, Ba, Ca, Mg, Ni, Pb, and Zn in all extracts were determined by inductively coupled plasma atomic emission spectrometry. Pattern recognition method was carried out in order to provide better understanding of the nature of distribution of elements according to their origins. Results indicate possible leaching of As, Ca, Cd, Cu, Zn, and Pb. Among these elements As, Cd, and Pb are toxicologically the most important but they were not present in the first two phases with the exception of As. The leaching could be destructive and cause negative effects on plants, water pollution, and damage to some life forms.

  8. Inventory of future power and heat production technologies. Partial report Energy storage; Inventering av framtidens el- och vaermeproduktionstekniker. Delrapport Energilagring

    Energy Technology Data Exchange (ETDEWEB)

    Messing, Lars; Lindahl, Sture (Gothia Power AB, Goeteborg (Sweden))

    2008-12-15

    In this report a survey of different techniques for storage of electrical energy. The following alternatives are described regarding method, characteristics, potential and economy. Batteries; Capacitors; Flywheels; Pump storage hydro power plants; Hydrogen gas generation; Air compression. Regarding evaluation of methods for storage of electrical energy. Battery storage: The development of Lithium-ion batteries are of great interest. In the present situation it is however difficult of classify battery storage as a good alternation in applications with frequent re-charging cycles and re-charging of large energy volumes. The batteries have limited life length compared to other alternatives. Also the power is limited at charging and discharging. Energy storage in capacitors: 'Super-capacitors' having large power capacity is considered to be of interest in applications where fast control of power is necessary. The ongoing development of based on carbon-nanotubes will increase the energy storage capacity compared with the today existing super-capacitors. This can in the future be an alternative to battery storage. Of further interest is also the idea to combine battery and capacitor based storage to achieve longer life-time of the batteries and faster power control. Flywheel energy storage: The energy storage capacity is relatively limited but power control can be fast. This system can be an alternative to capacitor based energy storage. Pump-storage hydro power plant: This type of energy storage is well suited and proven for time frame up to some days. In the Swedish power system there is today not any large demand of energy storage in this time frame as there is a large capacity in conventional hydro power plants with storage capacity. Pump-storage can however be of interest in the southern part of Sweden. In some operation stages the grid is loaded up to its limit due to large power transmission from the north. The pump-storage can reduce this power transfer

  9. Opportunities for Decarbonizing Existing U.S. Coal-Fired Power Plants via CO2 Capture, Utilization and Storage.

    Science.gov (United States)

    Zhai, Haibo; Ou, Yang; Rubin, Edward S

    2015-07-07

    This study employs a power plant modeling tool to explore the feasibility of reducing unit-level emission rates of CO2 by 30% by retrofitting carbon capture, utilization, and storage (CCUS) to existing U.S. coal-fired electric generating units (EGUs). Our goal is to identify feasible EGUs and their key attributes. The results indicate that for about 60 gigawatts of the existing coal-fired capacity, the implementation of partial CO2 capture appears feasible, though its cost is highly dependent on the unit characteristics and fuel prices. Auxiliary gas-fired boilers can be employed to power a carbon capture process without significant increases in the cost of electricity generation. A complementary CO2 emission trading program can provide additional economic incentives for the deployment of CCS with 90% CO2 capture. Selling and utilizing the captured CO2 product for enhanced oil recovery can further accelerate CCUS deployment and also help reinforce a CO2 emission trading market. These efforts would allow existing coal-fired EGUs to continue to provide a significant share of the U.S. electricity demand.

  10. 节能调度环境下风电、水电与抽水蓄能电站联合运行优化模型及应用%Optimization Model of Wind Power, Thermal Power and Pumped Storage Power Station Jointly Operation under Energy-saving Dispatching Environment

    Institute of Scientific and Technical Information of China (English)

    王抒祥; 鞠立伟; 尚金成; 张金良; 谭忠富; 王文迪

    2013-01-01

    为吸纳弃风、增加风电并网量,基于节能发电调度办法,以发电产生的燃煤成本、机组启停成本及污染排放成本最小为目标,提出了风电、火电联合运行优化模型和风电、火电与抽水蓄能电站联合运行优化模型.算例分析表明,与选择火电作为风电备用服务相比,当选择抽水蓄能电站作为备用服务时,燃煤发电成本、启停成本及污染排放成本明显降低,弃风被完全消纳.选用抽水蓄能电站作为风电备用服务具有显著的环境效益.%In order to be able to absorb the abandoned wind and increase wind power grid-connection, this paper puts forward wind power, thermal power jointly operation optimization model and wind power, thermal power, pumped storage power jointly operation optimization model based on the energy-saving generation dispatching way under the target of minimizing the cost of coal-fired cost, unit commitment and pollution emissions. Comparison of the thermal power as reserve service, the example results show that selecting pumped storage power station as reserve service can reduce the cost of coal-fired power generation, unit commitment and pollution emissions significantly and eliminate abandoned wind. Thus, the choice of pumped storage power station as wind power reserve service has significant environmental benefits.

  11. Capturing low-carbon power system dynamics : Interactions between intermittent renewables and power plants with CO2 capture and storage

    NARCIS (Netherlands)

    Brouwer, A.S.

    2015-01-01

    Low-carbon power systems are needed by the year 2050 to meet climate change mitigation targets. This dissertation investigates the operational and economic feasibility of such future low-carbon power systems by simulating the Dutch and European power systems. Particular attention is paid to the impa

  12. Capturing low-carbon power system dynamics : Interactions between intermittent renewables and power plants with CO2 capture and storage

    NARCIS (Netherlands)

    Brouwer, Anne-Sjoerd

    2015-01-01

    Low-carbon power systems are needed by the year 2050 to meet climate change mitigation targets. This dissertation investigates the operational and economic feasibility of such future low-carbon power systems by simulating the Dutch and European power systems. Particular attention is paid to the

  13. Distributed energy systems with wind power and energy storage

    Energy Technology Data Exchange (ETDEWEB)

    Korpaas, Magnus

    2004-07-01

    The topic of this thesis is the study of energy storage systems operating with wind power plants. The motivation for applying energy storage in this context is that wind power generation is intermittent and generally difficult to predict, and that good wind energy resources are often found in areas with limited grid capacity. Moreover, energy storage in the form of hydrogen makes it possible to provide clean fuel for transportation. The aim of this work has been to evaluate how local energy storage systems should be designed and operated in order to increase the penetration and value of wind power in the power system. Optimization models and sequential and probabilistic simulation models have been developed for this purpose. Chapter 3 presents a sequential simulation model of a general wind hydrogen energy system. Electrolytic hydrogen is used either as a fuel for transportation or for power generation in a stationary fuel cell. The model is useful for evaluating how hydrogen storage can increase the penetration of wind power in areas with limited or no transmission capacity to the main grid. The simulation model is combined with a cost model in order to study how component sizing and choice of operation strategy influence the performance and economics of the wind-hydrogen system. If the stored hydrogen is not used as a separate product, but merely as electrical energy storage, it should be evaluated against other and more energy efficient storage options such as pumped hydro and redox flow cells. A probabilistic model of a grid-connected wind power plant with a general energy storage unit is presented in chapter 4. The energy storage unit is applied for smoothing wind power fluctuations by providing a firm power output to the grid over a specific period. The method described in the chapter is based on the statistical properties of the wind speed and a general representation of the wind energy conversion system and the energy storage unit. This method allows us to

  14. Heat transfer in fuel oil storage tank at thermal power plants with local fuel heating

    Directory of Open Access Journals (Sweden)

    Kuznetsova Svetlana A.

    2015-01-01

    Full Text Available Results of mathematical modeling of the thermal control system in fuel oil storage, in the presence of heat source at the lower boundary of the region, in the framework of models of incompressible viscous fluid are presented. Solved the system of differential equations of non-stationary Navier-Stokes equations, the energy equation and the heat equation with appropriate initial and boundary conditions. Takes into account the processes of heat exchange region considered with the environment. A comparative analysis of the dependence of average temperatures of oil in the volume of the tank on the time calculated by the simplified (balanced method and obtained as a result of numerical simulation are performed.

  15. Combining plasma gasification and solid oxide cell technologies in advanced power plants for waste to energy and electric energy storage applications.

    Science.gov (United States)

    Perna, Alessandra; Minutillo, Mariagiovanna; Lubrano Lavadera, Antonio; Jannelli, Elio

    2017-09-28

    The waste to energy (WtE) facilities and the renewable energy storage systems have a strategic role in the promotion of the "eco-innovation", an emerging priority in the European Union. This paper aims to propose advanced plant configurations in which waste to energy plants and electric energy storage systems from intermittent renewable sources are combined for obtaining more efficient and clean energy solutions in accordance with the "eco-innovation" approach. The advanced plant configurations consist of an electric energy storage (EES) section based on a solid oxide electrolyzer (SOEC), a waste gasification section based on the plasma technology and a power generation section based on a solid oxide fuel cell (SOFC). The plant configurations differ for the utilization of electrolytic hydrogen and oxygen in the plasma gasification section and in the power generation section. In the first plant configuration IAPGFC (Integrated Air Plasma Gasification Fuel Cell), the renewable oxygen enriches the air stream, that is used as plasma gas in the gasification section, and the renewable hydrogen is used to enrich the anodic stream of the SOFC in the power generation section. In the second plant configuration IHPGFC (Integrated Hydrogen Plasma Gasification Fuel Cell) the renewable hydrogen is used as plasma gas in the plasma gasification section, and the renewable oxygen is used to enrich the cathodic stream of the SOFC in the power generation section. The analysis has been carried out by using numerical models for predicting and comparing the systems performances in terms of electric efficiency and capability in realizing the waste to energy and the electric energy storage of renewable sources. Results have highlighted that the electric efficiency is very high for all configurations (35-45%) and, thanks to the combination with the waste to energy technology, the storage efficiencies are very attractive (in the range 72-92%). Copyright © 2017 Elsevier Ltd. All rights

  16. Current power plant

    Energy Technology Data Exchange (ETDEWEB)

    Nickell, J.H.

    1979-03-06

    A current power plant is described that includes a shaft mounted turbine wheel for employment in water current, a housing adjacent the impeller and to which the shaft extends, a ramp positioned on the upstream side of the impellar, and a frame on which the turbine wheel is mounted. The frame is mounted by rollers on a tract such that the impeller and frame may be rolled on the tracks inside the housing, whereafter doors are closed, and water around the turbine wheel may be pumped out to facilitate turbine repair.

  17. Comparison and application of storage technologies from a power plant operator's point of view; Vergleich und Einsatz von Speichertechnologien aus Sicht eines Kraftwerksbetreibers

    Energy Technology Data Exchange (ETDEWEB)

    Kurth, Marcus [Hochschule fuer Technik, Wirtschaft und Gestaltung, Konstanz (Germany); Lens, Hendrik; Marquard, Juergen [STEAG Energy Services GmbH, Essen (Germany); Dengel, Andreas [STEAG New Energies GmbH, Saarbruecken (Germany); Schweissthal, Wolfgang [STEAG Power Saar GmbH, Saarbruecken (Germany); Kolligs, Carsten [Evonik Industries AG, Marl (Germany)

    2011-07-01

    As electrical energy can only be stored in small amounts, electrical power systems must maintain the balance between production and usage of electricity at any time. Apart from intelligent hierarchical structures, this requires producers that are based on storable primary energy sources. The current development shows an increasing usage of fluctuating primary energy sources. To compensate for this, storage options must be found at other locations in the energy conversion chain. In this paper different storage technologies are compared and evaluated from the point of view of a power plant operator. (orig.)

  18. Analysis of pumping systems to large flows of cooling water in power plants; Analisis de sistemas de bombeo para grandes flujos de agua de enfriamiento en centrales termoelectricas

    Energy Technology Data Exchange (ETDEWEB)

    Sanchez Sanchez, Ramon; Herrera Velarde, Jose Ramon; Gonzalez Sanchez, Angel [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)]. E-mail: rsanchez@iie.org.mx; jrhv@iie.org.mx; ags@iie.org.mx

    2010-11-15

    Accurate measurement of large water flows remains being a challenge in the problems of implementation of circulating water systems of power plants and other applications. This paper, presents a methodology for the analysis in pumping systems with high rates of water in power plants, as well as their practical application and results in pipelines water flow of a thermoelectrical power plant of 350 MW. In this power plant, the water flow per pipeline for a half of condenser oscillates around 7 m{sup 3}/s (14 m{sup 3}/s per power generating unit). In this analysis, we present the techniques used to measure large flows of water with high accurately, as well as the computational model for water circulating system using PIPE FLO and the results of practical application techniques. [Spanish] La medicion precisa de grandes flujos de agua, sigue siendo un reto en los problemas de aplicacion de sistemas de agua de circulacion de centrales termoelectricas, entre otras aplicaciones. En este articulo, se presenta una metodologia para el analisis de sistemas de bombeo con grandes flujos de agua en centrales termoelectricas, asi como, su aplicacion practica y los resultados obtenidos en los ductos de agua de circulacion de una central generadora con unidades de 350 MW. En esta central, los flujos por caja de agua oscilan alrededor de los 7 m{sup 3}/s (14 m{sup 3}/s por unidad generadora). En el analisis, se presentan las tecnicas utilizadas para medir con precision grandes flujos de agua (tubo de Pitot), asi como, el modelado del sistema de agua de circulacion por medio de un paquete computacional (PIPE FLO) y resultados obtenidos de la aplicacion de dichas tecnicas.

  19. Design of an ammonia closed-loop storage system in a CSP power plant with a power tower cavity receiver

    Science.gov (United States)

    Abdiwe, Ramadan; Haider, Markus

    2017-06-01

    In this study the thermochemical system using ammonia as energy storage carrier is investigated and a transient mathematical model using MATLAB software was developed to predict the behavior of the ammonia closed-loop storage system including but not limited to the ammonia solar reactor and the ammonia synthesis reactor. The MATLAB model contains transient mass and energy balances as well as chemical equilibrium model for each relevant system component. For the importance of the dissociation and formation processes in the system, a Computational Fluid Dynamics (CFD) simulation on the ammonia solar and synthesis reactors has been performed. The CFD commercial package FLUENT is used for the simulation study and all the important mechanisms for packed bed reactors are taken into account, such as momentum, heat and mass transfer, and chemical reactions. The FLUENT simulation reveals the profiles inside both reactors and compared them with the profiles from the MATLAB code.

  20. A Method to Evaluate Comprehensive Benefits of Hybrid Wind Power-Pumped Storage System%风电-抽水蓄能联合系统综合效益评价方法

    Institute of Scientific and Technical Information of China (English)

    肖白; 丛晶; 高晓峰; 谷禹

    2014-01-01

    In allusion to restricted grid-connected capacity and high wind power curtailment when large-scale wind farm is grid-connected, in usual it is considered to improve power grid’s ability of accommodating wind power by energy storage system, however how to evaluate the overall efficiency of the hybrid wind power-pumped storage system is the problem to be solved well. For this reason, the investment cost, economic benefit of pumped storage system and its operational constraints are analyzed, thus the follow-up mechanism between comprehensive benefits of hybrid wind power-pumped storage system and energy storage capacity under optimized operating condition of regional power grid is revealed, and a mathematical model to solve the comprehensive benefits is established and a method to evaluate the comprehensive benefits is proposed. Based on output curves of mutually matched thermal generation units, wind power and load characteristics of power grid and combining with the installation capacity of thermal generation units and utilizing the incidence relation between system frequency and load (or the change of power generation), the proposed method quantitatively analyzes the impacts of the change of such factors of pumped storage station as its capacity, service life, cost and revenue on comprehensive benefits and power grid’s accommodation ability of wind power. Case analysis shows that proposed evaluation method is effective.%面对大规模风电并网运行时接入容量受限、弃风量大的情况,通常的做法是考虑利用储能系统来提高电网接纳风电能力,但如何评价其整体效益是必须解决好的问题。为此分析了抽水蓄能系统的投资成本、经济效益及其运行约束,揭示了风电-抽水蓄能联合系统综合效益和储能容量之间在地区电力系统最优化运行条件下的随动机理,建立了求取综合效益的数学模型,提出了综合效益的评价方法。该方法基于相互匹配

  1. Kansas Power Plants

    Data.gov (United States)

    Kansas Data Access and Support Center — The Kansas Power Plants database depicts, as point features, the locations of the various types of power plant locations in Kansas. The locations of the power plants...

  2. Criticality Calculations of Fresh LEU and MOX Assemblies for Transport and Storage at the Balakovo Nuclear Power Plant

    Energy Technology Data Exchange (ETDEWEB)

    Goluoglu, S.

    2001-01-11

    Transportation of low-enriched uranium (LEU) and mixed-oxide (MOX) assemblies to and within the VVER-1000-type Balakovo Nuclear Power Plant is investigated. Effective multiplication factors for fresh fuel assemblies on the railroad platform, fresh fuel assemblies in the fuel transportation vehicle, and fresh fuel assemblies in the spent fuel storage pool are calculated. If there is no absorber between the units, the configurations with all MOX assemblies result in higher effective multiplication factors than the configurations with all LEU assemblies when the system is dry. When the system is flooded, the configurations with all LEU assemblies result in higher effective multiplication factors. For normal operating conditions, effective multiplication factors for all configurations are below the presumed upper subcritical limit of 0.95. For an accident condition of a fully loaded fuel transportation vehicle that is flooded with low-density water (possibly from a fire suppression system), the presumed upper subcritical limit is exceeded by configurations containing LEU assemblies.

  3. 西北地区抽水蓄能发展研究%Research on Development of Pumped-Storage Hydropower in Northwest of China

    Institute of Scientific and Technical Information of China (English)

    贾德香; 程路

    2012-01-01

    With the large-scale development of wind power in Northwest China, the feasibility for building pumped-storage plants in this area needs to be studied to facilitate the effective consumption of wind power. The principle and method for planning pumped-storage plants are proposed. Considering the traditional hydropower development and the planned sites of pumped-storage plants, with the aim of minimum total social cost of the power supply, and with multiple factors such as the effective consumption of wind power and the balance of power and energy as constraints, the paper proposes a rational and feasible development scale and the distribution of pumped-storage plants in Northwest China, which can provide a reference for the formulation of development planning and management measures of pumped-storage power stations for the northwest grid.%面对我国西北地区未来风电大规模开发趋势,需要深入研究西北地区建设抽水蓄能电站的可行性,以便促进风电有效消纳.提出了抽水蓄能电站发展研究的思路、原则和方法,结合常规水电开发和抽蓄电站选点,以全社会电力供应总成本最低为目标,以清洁能源有效消纳和电力电量平衡等多种因素为约束条件,提出了西北地区抽水蓄能电站的合理可行的开发规模、布局,为西北电网制定抽水蓄能发展规划和管理措施提供参考.

  4. 抽水蓄能机组暂态故障智能分析系统开发及应用%Design and Application of Transient Fault Analysis System for Pumped-storage Power Unit

    Institute of Scientific and Technical Information of China (English)

    巩宇

    2013-01-01

    由于缺乏完善、实用的知识库,目前没有故障智能分析系统能对工况复杂的抽水蓄能机组最重要的故障模式暂态故障进行有效的分析.为提高抽水蓄能机组故障分析效率,提出了一种可行、实用的故障知识库和分析程序的设计方法,并介绍了广州蓄能水电厂据此开发的计算机故障分析系统的应用情况,最后以两个广州蓄能水电厂的真实故障分析实例验证了该系统的有效性和实用性.%Current fault analysis system is inefficient to analyze the transient faults of pumped-storage power units because of the lack of perfect and practical knowledge base.In order to enhance fault analysis efficiency,a design method for establishing feasible fault knowledge base and practical fault analysis function is proposed,and the application of real fault analysis system which is designed through this method in Guangzhou Pumped Storage Power Station is also introduced.Two fault analysis examples in Guangzhou Pumped Storage Power Station prove the availability and practicability of system.

  5. Impact of Storage Technologies upon Power System Losses

    Directory of Open Access Journals (Sweden)

    DULAU Lucian Ioan

    2015-05-01

    Full Text Available The paper describes the main characteristics of storage technologies. The most important storage technologies are the batteries, hydrogen, pumped hydro, flywheels, compressed air, super-capacitors and superconducting magnetic devices. The storage technologies can be classified based on the function principle into electrochemical, mechanical and electromagnetic devices. The storage systems can also be classified based on their capacity to store power into short and long term devices. A power flow analysis is performed for the situation with and without a storage unit. The storage unit is inserted into the IEEE 14 bus test system.

  6. Final Deliverable W6, D6.4: Coal power plants with carbon capture and storage – A sustainability assessment

    NARCIS (Netherlands)

    Ramirez, C.A.; Schakel, W.B.; Wood, R.; Grytli, T.

    2013-01-01

    Carbon Capture and Storage (CCS) is increasingly gaining attention as a strategy for the abatement of greenhouse gas (GHG) emissions. CCS includes the capture of CO2 emissions from electricity generation plants and/or industrial processes, its transport (by pipeline or ships) and sequestration in un

  7. Final Deliverable W6, D6.4: Coal power plants with carbon capture and storage – A sustainability assessment

    NARCIS (Netherlands)

    Ramirez, C.A.|info:eu-repo/dai/nl/284852414; Schakel, W.B.|info:eu-repo/dai/nl/369280784; Wood, R.; Grytli, T.

    2013-01-01

    Carbon Capture and Storage (CCS) is increasingly gaining attention as a strategy for the abatement of greenhouse gas (GHG) emissions. CCS includes the capture of CO2 emissions from electricity generation plants and/or industrial processes, its transport (by pipeline or ships) and sequestration in un

  8. 拟定蒙西电网风电与蓄能电站配合运行规模的简化方法%A Simplified Determination Method for Capacity Combination of Wind Power Stations and Pumped Storage Power Stations in West Inner Mongolia Power Grid

    Institute of Scientific and Technical Information of China (English)

    曾非同; 陈初龙; 唐修波

    2015-01-01

    大规模风电接入对电网影响较大,而抽水蓄能电站启停迅速,可以较好的配合风电运行,减小对电网的影响. 结合内蒙古西部电网(简称蒙西电网)风电基地出力特性和典型日负荷特性,从风电与用电负荷的吻合程度、对电网调峰容量的影响、弃风电量的经济比较分析,抓住了影响风电与抽水蓄能电站配合运行规模的主要因素:在负荷低谷时段风电的上网(容量)率,提出了合理的简化方法. 该方法简单直观、实用有效,需要的资料少,对合理开发利用风电资源的规模估算具有实际指导意义,对风电与抽水蓄能电站配合运行规模的规划设计具有参考价值.%Large-scale use of wind power raises many problems in integration into the existing power grid .While the pumped storage power stations are of advantages such as quick startup and shutdown , which could cooperate with wind power stations and reduce their negative influence to the power grid .In this paper , capacity planning for the wind power base in the West Inner Mongolia Power Grid is discussed .Based on the characteristics of output power and typical daily load, major factors that would affect the capacity combination of wind power stations and pumped storage power stations in the power grid are analyzed , including the agreement between the wind power output and the power load , the influ-ence on the peak regulating capacity , and the cost of abandoned wind power .A simplified method is then proposed for the determination of wind power capacity rate in the low load period .This effective and practical method is of great use to the wind power capacity planning , and also could be a useful reference for the capacity planning of power grid with combination of wind power stations and pumped storage power stations .

  9. A new principle for underground pumped hydroelectric storage

    DEFF Research Database (Denmark)

    Olsen, Jan; Paasch, Kasper; Lassen, Benny

    2015-01-01

    cavity. The cavity is formed by two impermeable membranes welded along the edges. A simple model captures the dynamics of the system revealing the importance of both visco-elastic and plastic effects for the cyclic loading of the soil. The results indicate that the efficiency of this new concept...... will be very close to that of the traditional pumped hydro storage (PHS) technology and the energy lost by deformation of the soil will be between 0.04 and 0.12% for a full scale system of 30 MW power and 200 MWh capacity. A key feature of the concept is the relatively price efficient design where the main...

  10. Numerical Analysis of the Transient Behaviour of a Variable Speed Pump-Turbine during a Pumping Power Reduction Scenario

    Directory of Open Access Journals (Sweden)

    Giorgio Pavesi

    2016-07-01

    Full Text Available To achieve the carbon free electricity generation target for 2050, the penetration of renewable energy sources should further increase. To address the impacts of their unpredictable and intermittent characteristics on the future electricity grid, Pumped Hydro Energy Storage (PHES plants should enhance their regulation capability by extending their continuous operating range far beyond the optimal normal working range. However, for the time being, the regulation capability of the new generation of PHES, equipped with reversible pump-turbines due to their cost-effectiveness, is limited at part load by instability problems. The aim of this paper is to analyse, during a pumping power reduction scenario, the onset and development of unsteady phenomena leading to unstable behaviour. A 3D transient numerical simulation was carried out on the first stage of a variable-speed two-stage pump-turbine from full load to the unstable operating zone by progressively reducing the speed from 100% to 88% rpm corresponding to a power reduction from full load to about 60% with a ramp rate of 1.5% per s. Two three-dimensional unsteady flow structures affecting the return channel and the wicket gates at the end of the first stage were identified and their evolution in the power regulation scenario was fluid-dynamically and spectrally characterized to determine the fluid-dynamical conditions causing the head drop in the hump zone.

  11. Concentrating Solar Power - Molten Salt Pump Development, Final Technical Report (Phase 1)

    Energy Technology Data Exchange (ETDEWEB)

    Michael McDowell; Alan Schwartz

    2010-03-31

    The purpose of this project is to develop a long shafted pump to operate at high temperatures for the purpose of producing energy with renewable resources. In Phase I of this three phase project we developed molten salt pump requirements, evaluated existing hardware designs for necessary modifications, developed a preliminary design of the pump concept, and developed refined cost estimates for Phase II and Phase III of the project. The decision has been made not to continue the project into Phases II and III. There is an ever increasing world-wide demand for sources of energy. With only a limited supply of fossil fuels, and with the costs to obtain and produce those fuels increasing, sources of renewable energy must be found. Currently, capturing the sun's energy is expensive compared to heritage fossil fuel energy production. However, there are government requirements on Industry to increase the amount of energy generated from renewable resources. The objective of this project is to design, build and test a long-shafted, molten salt pump. This is the type of pump necessary for a molten salt thermal storage system in a commercial-scale solar trough plant. This project is under the Department of Energy (DOE) Solar Energy Technologies Program, managed by the Office of Energy Efficiency and Renewable Energy. To reduce the levelized cost of energy (LCOE), and to meet the requirements of 'tomorrows' demand, technical innovations are needed. The DOE is committed to reducing the LCOE to 7-10 cents/kWh by 2015, and to 5-7 cents/kWh by 2020. To accomplish these goals, the performance envelope for commercial use of long-shafted molten salt pumps must be expanded. The intent of this project is to verify acceptable operation of pump components in the type of molten salt (thermal storage medium) used in commercial power plants today. Field testing will be necessary to verify the integrity of the pump design, and thus reduce the risk to industry. While the primary

  12. low pump power photonic crystal fibre amplifiers

    DEFF Research Database (Denmark)

    Hougaard, Kristian G.; Broeng, Jes; Bjarklev, Anders Overgaard

    2003-01-01

    Designs of low pump power optical amplifiers, based on photonic crystal fibres are presented. The potential of these fibre amplifiers is investigated, and it is demonstrated that such amplifiers may deliver gains of more than 15 dB at 1550 nm with less than 1 mW of optical pump power....

  13. Managing congestion in distribution grids - Market design consideration. How heat pumps can deliver flexibility though well-designed markets and virtual power plant technology

    Energy Technology Data Exchange (ETDEWEB)

    Holmberg Rasmussen, L. [NEAS Energy, Aalborg (Denmark); Bang, C.; Togeby, M. [Ea Energy Analyses, Copenhagen (Denmark)

    2012-10-15

    of end-users to react to price fluctuations e.g. spot prices, thus enabling them to save on their electricity bill, and contribute to the overall system balance. The aim of this report is to discuss challenges with congestions in the distribution grids and how these can be solved through different tariffs and connection agreements, and how a market can be designed to manage congestion in local grids. A part of this is the investigation of the principal questions: Does the DSO have information about potential congestions, and what should the geographic scope of such a signal be? End-user demand can be controlled by a computer in each home which responds to a price signal that originates from the DSO, or it could be controlled by a centralised system, e.g. a virtual-power-plant (VPP) setup. The VPP set-up is in focus in this project, but the signal from the DSO should likely be useable in relation to both control solutions. How future signals from the DSO to the consumer would work in practice is open to discussion as there are a number of potential options, each which vary with respect to their geographic scope, timing, notice, and price level. Our initial findings indicate a number of issues that appear to be clear: 1) The signal indicating a potential congestion in distribution grids must originate from the DSO, and this signal will be directed to the retailer/aggregator/balance responsible, which will pass it on to end-users. 2) Ideally, the signal with grid tariffs should be sent to all end-users (not only heat pumps) in the congested area (i.e. possibly a small fraction of the DSO area). However, with more than 10,000 potential grids this may not be practical, and costs may not allow for this ideal solution. 3) Simple time-of-use tariffs can be an important first step in the direction of dynamic tariffs. Time-of-use tariffs can motivate behavioural change, i.e. computers and communication are not a requirement. It has not been analysed in detail how far in the

  14. Managing congestion in distribution grids - Market design consideration. How heat pumps can deliver flexibility though well-designed markets and virtual power plant technology

    Energy Technology Data Exchange (ETDEWEB)

    Holmberg Rasmussen, L. [NEAS Energy, Aalborg (Denmark); Bang, C.; Togeby, M. [Ea Energy Analyses, Copenhagen (Denmark)

    2012-10-15

    of end-users to react to price fluctuations e.g. spot prices, thus enabling them to save on their electricity bill, and contribute to the overall system balance. The aim of this report is to discuss challenges with congestions in the distribution grids and how these can be solved through different tariffs and connection agreements, and how a market can be designed to manage congestion in local grids. A part of this is the investigation of the principal questions: Does the DSO have information about potential congestions, and what should the geographic scope of such a signal be? End-user demand can be controlled by a computer in each home which responds to a price signal that originates from the DSO, or it could be controlled by a centralised system, e.g. a virtual-power-plant (VPP) setup. The VPP set-up is in focus in this project, but the signal from the DSO should likely be useable in relation to both control solutions. How future signals from the DSO to the consumer would work in practice is open to discussion as there are a number of potential options, each which vary with respect to their geographic scope, timing, notice, and price level. Our initial findings indicate a number of issues that appear to be clear: 1) The signal indicating a potential congestion in distribution grids must originate from the DSO, and this signal will be directed to the retailer/aggregator/balance responsible, which will pass it on to end-users. 2) Ideally, the signal with grid tariffs should be sent to all end-users (not only heat pumps) in the congested area (i.e. possibly a small fraction of the DSO area). However, with more than 10,000 potential grids this may not be practical, and costs may not allow for this ideal solution. 3) Simple time-of-use tariffs can be an important first step in the direction of dynamic tariffs. Time-of-use tariffs can motivate behavioural change, i.e. computers and communication are not a requirement. It has not been analysed in detail how far in the

  15. Determination of storage coefficients during pumping and recovery.

    Science.gov (United States)

    Ashjari, Javad

    2013-01-01

    An aquifer test is used mostly to determine the storage coefficient and transmissivity. Although residual drawdown data are widely used in estimating the transmissivity of aquifers, the estimation of storage coefficients with recovery data is controversial. Some researchers have proposed methods to estimate storage coefficients with recovery data by assuming equality of storage coefficients for the recovery and pumping periods (S = S'). The aim of this study is to determine storage coefficients without such an assumption, that is, S≠S'. The method is a modified version of Banton-Bangoy's method without considering drawdown data due to pumping. Drawdown is plotted vs. the logarithmic ratio (t'/t) or time since pumping stopped to the duration of pumping and the ratio of storage coefficient during recovery to the storage coefficient from the pumping period (S'/S). The method is verified with one case study and two synthetic examples. Thus, it is possible to determine storage coefficient of pumping period accurately without any data from pumping period by recovery data.

  16. Techno-Economic Assessment of Heat Transfer Fluid Buffering for Thermal Energy Storage in the Solar Field of Parabolic Trough Solar Thermal Power Plants

    Directory of Open Access Journals (Sweden)

    Jorge M. Llamas

    2017-08-01

    Full Text Available Currently, operating parabolic trough (PT solar thermal power plants, either solar-only or with thermal storage block, use the solar field as a heat transfer fluid (HTF thermal storage system to provide extra thermal capacity when it is needed. This is done by circulating heat transfer fluid into the solar field piping in order to create a heat fluid buffer. In the same way, by oversizing the solar field, it can work as an alternative thermal energy storage (TES system to the traditionally applied methods. This paper presents a solar field TES model for a standard solar field from a 50-MWe solar power plant. An oversized solar model is analyzed to increase the capacity storage system (HTF buffering. A mathematical model has been developed and different simulations have been carried out over a cycle of one year with six different solar multiples considered to represent the different oversized solar field configurations. Annual electricity generation and levelized cost of energy (LCOE are calculated to find the solar multiple (SM which makes the highest solar field thermal storage capacity possible within the minimum LCOE.

  17. 大型抽水蓄能机组热工保护设置与应用%Setting and Application of Thermal Protections for Large Pumped-storage Power Units

    Institute of Scientific and Technical Information of China (English)

    彭煜民

    2012-01-01

    The unit of pumped -storage power station will be run in many different conditions and switched between them frequently. The thermal protections have important roles on the normal operation of units and the mitigation of accidents. The thermal protections, including temperature protection, pressure and pressure difference protection, flow protection, liquid level protection, displacement/position protection, vibration protection, over-speed protection and powerhouse flooded protection, are analyzed in detail herein. The experiences can be as references to the design of other pumped-storage power stations.%抽水蓄能电站机组运行工况多且工况转换频繁,热工保护对机组正常运行、避免扩大事故有着举足轻重的作用.对热工保护中的温度保护、压力压差保护、流量保护、液位保护、位移(位置)保护、振动保护、过速保护及水淹厂房等保护做了详细的分析与说明,可供其他抽水蓄能电站进行热工保护设计时借鉴.

  18. The operation of small cogeneration plants and short-term storage for district heating and public electric power

    DEFF Research Database (Denmark)

    Ilkjær, J; Petersen, P.M.; Qvale, Einar Bjørn

    1989-01-01

    A theoretical investigation of the economics of cogeneration supplemented by warm-water storage and subjected to a three-step price schedule for electricity, has been carried out. Some general guidelines can be derived, but no simple design rules, such as those for cogeneration plants operating...... with a two-step schedule, seem to govern the design of such plants subjected to the new conditions. Simulation studies have been initiated in order to arrive at sufficiently accurate optimal store dimensions and operational strategy. The results from simulation studies which give the store as a function...... of cogeneration plant size relative to the total heat demand in the geographical region supplied by the plant are shown...

  19. Estimation of probability density functions of damage parameter for valve leakage detection in reciprocating pump used in nuclear power plants

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Jong Kyeom; Kim, Tae Yun; Kim, Hyun Su; Chai, Jang Bom; Lee, Jin Woo [Div. of Mechanical Engineering, Ajou University, Suwon (Korea, Republic of)

    2016-10-15

    This paper presents an advanced estimation method for obtaining the probability density functions of a damage parameter for valve leakage detection in a reciprocating pump. The estimation method is based on a comparison of model data which are simulated by using a mathematical model, and experimental data which are measured on the inside and outside of the reciprocating pump in operation. The mathematical model, which is simplified and extended on the basis of previous models, describes not only the normal state of the pump, but also its abnormal state caused by valve leakage. The pressure in the cylinder is expressed as a function of the crankshaft angle, and an additional volume flow rate due to the valve leakage is quantified by a damage parameter in the mathematical model. The change in the cylinder pressure profiles due to the suction valve leakage is noticeable in the compression and expansion modes of the pump. The damage parameter value over 300 cycles is calculated in two ways, considering advance or delay in the opening and closing angles of the discharge valves. The probability density functions of the damage parameter are compared for diagnosis and prognosis on the basis of the probabilistic features of valve leakage.

  20. Preliminary design study of underground pumped hydro and compressed-air energy storage in hard rock. Volume 1: Executive summary

    Science.gov (United States)

    1981-05-01

    A preliminary design study of water compensated Compressed Air Energy Storage (CAES) and Underground Pumped Hydroelectric (UPH) plants for siting in geological conditions suitable for hard rock excavations was performed. The study was divided into five primary tasks as follows: establishment of design criteria and analysis of impact on power system; selection of site and establishment of site characteristics; formulation of design approaches; assessment of environmental and safety aspects; and preparation of preliminary design of plant. The salient aspects considered and the conclusions reached during the consideration of the five primary tasks for both CAES and UPH are presented.

  1. Operation ranges and dynamic capabilities of variable-speed pumped-storage hydropower

    Science.gov (United States)

    Mercier, Thomas; Olivier, Mathieu; Dejaeger, Emmanuel

    2017-04-01

    The development of renewable and intermittent power generation creates incentives for the development of both energy storage solutions and more flexible power generation assets. Pumped-storage hydropower (PSH) is the most established and mature energy storage technology, but recent developments in power electronics have created a renewed interest by providing PSH units with a variable-speed feature, thereby increasing their flexibility. This paper reviews technical considerations related to variable-speed PSH in link with the provision of primary frequency control, also referred to as frequency containment reserves (FCRs). Based on the detailed characteristics of a scale model pump-turbine, the variable-speed operation ranges in pump and turbine modes are precisely assessed and the implications for the provision of FCRs are highlighted. Modelling and control for power system studies are discussed, both for fixed- and variable-speed machines and simulation results are provided to illustrate the high dynamic capabilities of variable-speed PSH.

  2. A concept of an electricity storage system with 50 MWh storage capacity

    OpenAIRE

    Józef Paska; Mariusz Kłos; Paweł Antos; Grzegorz Błajszczak

    2012-01-01

    Electricity storage devices can be divided into indirect storage technology devices (involving electricity conversion into another form of energy), and direct storage (in an electric or magnetic fi eld). Electricity storage technologies include: pumped-storage power plants, BES Battery Energy Storage, CAES Compressed Air Energy Storage, Supercapacitors, FES Flywheel Energy Storage, SMES Superconducting Magnetic Energy Storage, FC Fuel Cells reverse or operated in systems with electrolysers an...

  3. 多能互补发电系统中抽水蓄能的优化配置%Optimal configuration of pumped-storage in hybrid power system

    Institute of Scientific and Technical Information of China (English)

    任岩; 刘雪枫; 郑源; 周兵

    2013-01-01

    Since the capacity of hybrid power system is configured experientially at present causing a high cost and low reliability.the capacity of wind generator and PV arrays were optimized by using the particle swarm optimization method,while the capacity of pumped-storage was optimized by means of the global optimization and local optimum methods.Firstly,the capacity of pumped-storage is configured preliminarily according to the annual load,annual wind and solar energy resources etc; secondly,the capacity configuration is verified and adjusted based on the monthly load,monthly wind and solar energy resources; at last,the configuration is further improved with the typical daily load,daily wind and solar energy resources.For an isolated hybrid Wind-PV-pumped-storage-desalination system,the capacity of pumped-storage was optimized with the global optimization and local optimum methods.The results showed that the preliminarily configured capacity of pumped-storage is 120 kW by means of the annual data,but the capacity needs to be updated to 420 kW by considering required monthly loss of power supply probability in the verifying process.Further,because of the volatility of daily load,wind and solar energy resources,an extra loss of power supply probability still exists,thus a certain capacity of storage battery needs to be configured.%为了解决多能互补发电系统中根据经验进行容量配置而导致成本高、可靠性低的问题,对风力发电机和光伏阵列的容量利用粒子群优化方法进行配置,抽水蓄能的容量利用整体一局部法进行优化配置.通过年负荷、年风能资源和年太阳能资源等初步配置其容量;再根据月负荷、月风能资源和月太阳能资源等进行校核、调整;最后,根据典型日负荷及相应的风能资源和太阳能资源等对其容量做进一步完善.以一套海岛孤网风-光-抽蓄-海水淡化系统为例,利用整体-局部法对系统中的抽水蓄能进行

  4. Heat pumps in combined heat and power systems

    DEFF Research Database (Denmark)

    Ommen, Torben Schmidt; Markussen, Wiebke Brix; Elmegaard, Brian

    2014-01-01

    of the considered cases. When considering a case where the heat pump is located at a CHP (combined heat and power) plant, a configuration that increases the DH return temperature proposes the lowest operation cost, as low as 12 EUR MWh-1 for a 90 °C e 40 °C DH network. Considering the volumetric heating capacity......Heat pumps have previously been proposed as a way to integrate higher amounts of renewable energy in DH (district heating) networks by integrating, e.g., wind power. The paper identifies and compares five generic configurations of heat pumps in DH systems. The operational performance......, a third configuration is superior in all cases. Finally, the three most promising heat pump configurations are integrated in a modified PQ-diagram of the CHP plant. Each show individual advantages, and for two, also disadvantages in order to achieve flexible operation....

  5. 抽水蓄能电站建设财务管理应注意的问题%Financial Management in the Construction of Pumped-storage Power Station

    Institute of Scientific and Technical Information of China (English)

    马善忠; 陈春晓; 黄皖红

    2012-01-01

    Bailianhe Pumped-storage Power Station is one of key projects in China's Eleventh Five-Year Plan with longer construction period, large amount of investment and various types of equipments. By strengthening financial management and focusing on the capital management, cost accounting and process supervision during project construction, Hubei Bailianhe Pumped Storage Company has effectively lowered project cost, avoided the capital risk and saved project investment.%白莲河抽水蓄能电站工程建设周期较长、投资大、设备种类繁多,是国家“十一五”时期重点工程项目.湖北白莲河抽水蓄能有限公司在建设中通过加强基建财务管理,注重基建资金管理、会计核算和过程监督,有效地降低工程造价,规避了资金风险,节省了工程投资.

  6. Solar power management for smart grids with storage systems

    Energy Technology Data Exchange (ETDEWEB)

    Gasco, Manuel [Universidad de Alicante (Spain). Area de Ingenieria Electrica; Rios, Alberto [Universidad Europea de Madrid (Spain). Area de Ingenieria Electrica

    2012-07-01

    The increasing integration of solar photovoltaic power into the power system makes the optimal management of different situations that can occur more and more important. The current capacity is observed in order to be able to predict the solar generation for short periods of time. This way it is possible to plan the production which would be adjusted to the variations in these storage systems allowing the system to maintain its constant programming for base plants, adjusting the variations in these systems in the short term. The referred accumulation systems are as follows: a fuel cell, mass flywheel, pump and turbine systems, compressed air systems, electrochemical cells, supercapacitors, superconductors, and electric vehicles. As a result the maximum benefit for the smart grid is achieved. (orig.)

  7. Research of Charging Scheme for Upper Reservoir of High Head Pumped-storage Power Station%高水头蓄能电站上库充水方案研究

    Institute of Scientific and Technical Information of China (English)

    曲梦泽

    2015-01-01

    The water charging modes for upper reservoir of pumped-storage power station are summarized and the hydraulic losses of flow regulating devices of gate valve, butterfly valve, flow control valve and orifice plate are analyzed and compared. It is concluded that the charging pump can safely operate in whole head range by selecting a certain number of orifice plates and installing an appropriate flow control valve. The case calculation shows that the charging pump can safely operate in suitable range when the orifice plates are used.%对抽水蓄能电站上库充水方式进行了总结,对闸阀、蝶阀、流量调节阀和孔板等管路流量调节元件的水力损失进行了分析比较,认为根据充水泵所允许的最小扬程和最大流量,选取数枚适用孔板,配套安装一台流量调节阀,可保证充水泵在全部几何扬程范围内安全运行。实例计算表明,推荐使用孔板能保证充水泵在合适的区域内运行。

  8. Wide-Area Energy Storage and Management System to Balance Intermittent Resources in the Bonneville Power Administration and California ISO Control Areas

    DEFF Research Database (Denmark)

    Makarov, Yuri V.; Yang, Bo; DeSteese, John G.

    2009-01-01

    (CAISO) areas. The proposed wide area energy management system (WAEMS) addresses these additional balancing requirements through energy exchange between the participat-ing control areas and through the use of energy storage and other generation resources. For the BPA and CAISO control areas, the new...... energy storage technologies for the pro-posed application include flywheel energy storage devices (ESD), pumped or conventional hydro power plants, and so-dium sulfur or nickel cadmium batteries. A preferred WAEMS architecture was selected as an aggregation of a flywheel ESD and a pumped storage (or...

  9. The Role of Energy Storages in Energy Independent Croatia

    DEFF Research Database (Denmark)

    Krajačić, Goran; Mathiesen, Brian Vad; Duić, Neven

    2009-01-01

    electricity, heat and transport demands, and including renewable energy, power plants, and combined heat and power production (CHP) for district heating. Using the 2007 energy system the wind power share is increased by two energy storage options: Pumped Hydro and Heat Pumps in combination with Heat Storages...

  10. Proceedings of the Clemson Workshop on Environmental Impacts of Pumped Storage Hydroelectric Operations

    Science.gov (United States)

    Clugston, J. P.

    1980-04-01

    The pumping of water to a high reservoir for storage during periods of low power demand, so that it can be used for the generation of electricity during peak power demand was discussed. Papers which were presented exchanged ideas and data with regard to the environmental impact of this regular interchange of water.

  11. Pumped storage system model and experimental investigations on S-induced issues during transients

    Science.gov (United States)

    Zeng, Wei; Yang, Jiandong; Hu, Jinhong

    2017-06-01

    Because of the important role of pumped storage stations in the peak regulation and frequency control of a power grid, pump turbines must rapidly switch between different operating modes, such as fast startup and load rejection. However, pump turbines go through the unstable S region in these transition processes, threatening the security and stability of the pumped storage station. This issue has mainly been investigated through numerical simulations, while field experiments generally involve high risks and are difficult to perform. Therefore, in this work, the model test method was employed to study S-induced security and stability issues for a pumped storage station in transition processes. First, a pumped storage system model was set up, including the piping system, model units, electrical control systems and measurement system. In this model, two pump turbines with different S-shaped characteristics were installed to determine the influence of S-shaped characteristics on transition processes. The model platform can be applied to simulate any hydraulic transition process that occurs in real power stations, such as load rejection, startup, and grid connection. On the experimental platform, the S-shaped characteristic curves were measured to be the basis of other experiments. Runaway experiments were performed to verify the impact of the S-shaped characteristics on the pump turbine runaway stability. Full load rejection tests were performed to validate the effect of the S-shaped characteristics on the water-hammer pressure. The condition of one pump turbine rejecting its load after another defined as one-after-another (OAA) load rejection was performed to validate the possibility of S-induced extreme draft tube pressure. Load rejection experiments with different guide vane closing schemes were performed to determine a suitable scheme to adapt the S-shaped characteristics. Through these experiments, the threats existing in the station were verified, the

  12. A Techno-Economic Assessment of Hybrid Cooling Systems for Coal- and Natural-Gas-Fired Power Plants with and without Carbon Capture and Storage.

    Science.gov (United States)

    Zhai, Haibo; Rubin, Edward S

    2016-04-05

    Advanced cooling systems can be deployed to enhance the resilience of thermoelectric power generation systems. This study developed and applied a new power plant modeling option for a hybrid cooling system at coal- or natural-gas-fired power plants with and without amine-based carbon capture and storage (CCS) systems. The results of the plant-level analyses show that the performance and cost of hybrid cooling systems are affected by a range of environmental, technical, and economic parameters. In general, when hot periods last the entire summer, the wet unit of a hybrid cooling system needs to share about 30% of the total plant cooling load in order to minimize the overall system cost. CCS deployment can lead to a significant increase in the water use of hybrid cooling systems, depending on the level of CO2 capture. Compared to wet cooling systems, widespread applications of hybrid cooling systems can substantially reduce water use in the electric power sector with only a moderate increase in the plant-level cost of electricity generation.

  13. Modeling of forward pump EDFA under pump power through MATLAB

    Science.gov (United States)

    Raghuwanshi, Sanjeev Kumar; Sharma, Reena

    2015-05-01

    Optical fiber loss is a limiting factor for high-speed optical network applications. However, the loss can be compensated by variety of optical amplifiers. Raman amplifier and EDFA amplifier are widely used in optical communication systems. There are certain advantages of EDFA over Raman amplifier like amplifying the signal at 1550 nm wavelength at which the fiber loss is minimum. Apart from that there is no pulse walk-off problem with an EDFA amplifier. With the advent of optical amplifiers like EDFA, it is feasible to achieve a high bit rate beyond terabits in optical network applications. In our study, a MATLAB simulink-based forward pumped EDFA (operating in C-band 1525-1565 nm) simulation platform has been devised to evaluate the following performance parameters like gain, noise figure, amplified spontaneous emission power variations of a forward pumped EDFA operating in C-band (1525-1565 nm) as functions of Er3+ fiber length, injected pump power, signal input power, and Er3+ doping density. The effect of an input pump power on gain and noise figure was illustrated graphically. It is possible to completely characterize and optimize the EDFA performance using our dynamic simulink test bed.

  14. Solar assisted absorption or motor driven heat pump with earth seasonal storage. Final report. Pt. 1 and 2

    Energy Technology Data Exchange (ETDEWEB)

    Lazzarin, R.M.

    1987-01-01

    A plant composed of an energy roof, a seasonal earth storage and an absorption heat pump has been experimented. The purpose was to study the behaviour of the various components and their interaction. The surveys went on during two years. The following operations are considered: The charging of the earth storage by the energy roof and the working of an absorption heat pump connected either to the energy roof or to the earth storage.

  15. Analysis of the noise of the jet pumps of the Unit 2 of the Laguna Verde nuclear power plant; Analisis de ruido de las bombas de chorro de la Unidad 2 de la Central Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Castillo D, R.; Ortiz V, J.; Ruiz E, J.A. [ININ, A.P. 18-1027, 11801 Mexico D.F. (Mexico); Calleros M, G. [CFE, Central Nucleoelectrica de Laguna Verde, Alto Lucero, Veracruz (Mexico)]. E-mail: rcd@nuclear.inin-mx

    2004-07-01

    The use of the analysis of noise for the detection of badly functioning of the components of a BWR it is a powerful tool in the determination of abnormal conditions of operation, during the life of a nuclear plant of power. From the eighties, some nuclear reactors have presented problems related with the jet pumps and the knots of the recirculation. The Regulatory Commission of the United States, in the I E bulletin 80-07, recommended to carry out a periodic supervision of the pressure drop of the jet pumps, to prevent structural failures. In this work, methods of analysis of noise are used for the detection of abnormal conditions of operation of the jet pumps of a BWR. Signals are analysed to low and high frequency of pressure drop with the NOISE software that is in development. The obtained results show the behavior of the jet pumps of jet 6 and 11 before and after a partial blockade in their throats where the pump 6 return to their condition of previous operation and the pump 11 present a new fall of pressure, inside the limit them permissible of operation. The methodology of the analysis of noise demonstrated to be an useful tool for the badly functioning detection, and you could apply to create a database to supervise the dynamic behavior of the jet pumps of an BWR. (Author)

  16. Optimal Operation of Pumped Hydro Energy Storage in Power System With Large Integration of Photovoltaic Generation%应对光伏并网的抽水蓄能电站优化运行

    Institute of Scientific and Technical Information of China (English)

    王辉; 崔建勇

    2014-01-01

    随着太阳能光伏的快速发展,光伏发电随机性与间歇性特点对电力系统的安全稳定运行带来了诸多挑战。建立供电可靠性评估模型评价光伏并网对电力系统运行的影响。提出采用抽水蓄能电站配合光伏发电运行来提高系统的可靠性。以成本最小化为目标建立抽水蓄能电站优化调度模型,采用蒙特卡罗模拟需求负载的不确定性,光伏出力的不确定性以及传统机组故障。运用遗传算法配合禁忌搜索对模型求解。通过IEEE-24节点算例分析验证模型与算法的可行性。仿真结果表明提出的方法在电力系统运行具有可靠性。而且,采取抽水蓄能电站运行修正模式可以有效解决电力过剩问题。%With the rapid development of photovoltaic (PV) generation the randomness and intermittence of PV generation evidently affect the secure and stable operation of power grid. A power supply reliability evaluation model is established to assess the impacts on grid-connected PV generation on power grid operation. It is proposed to improve power system reliability by pumped storage power station coordinated with grid-connected PV generation. Taking the minimized cost as the object, an optimal dispatching model of pumped storage power station is built, and the uncertainty of load demand, the uncertainty of PV generation output and the faults of traditional generating units are simulated by Monte Carlo simulation. The proposed dispatching model is solved by genetic algorithm combined with Tabu search. The feasibility of the proposed model and algorithm is validated by IEEE 24-bus system, and simulation results show that using the proposed method the reliability of power grid can be improved and the electric power surplus can be effectively coped with.

  17. Fragility Analysis Methodology for Degraded Structures and Passive Components in Nuclear Power Plants - Illustrated using a Condensate Storage Tank

    Energy Technology Data Exchange (ETDEWEB)

    Nie, J.; Braverman, J.; Hofmayer, C.; Choun, Y.; Kim, M.; Choi, I.

    2010-06-30

    The Korea Atomic Energy Research Institute (KAERI) is conducting a five-year research project to develop a realistic seismic risk evaluation system which includes the consideration of aging of structures and components in nuclear power plants (NPPs). The KAERI research project includes three specific areas that are essential to seismic probabilistic risk assessment (PRA): (1) probabilistic seismic hazard analysis, (2) seismic fragility analysis including the effects of aging, and (3) a plant seismic risk analysis. Since 2007, Brookhaven National Laboratory (BNL) has entered into a collaboration agreement with KAERI to support its development of seismic capability evaluation technology for degraded structures and components. The collaborative research effort is intended to continue over a five year period. The goal of this collaboration endeavor is to assist KAERI to develop seismic fragility analysis methods that consider the potential effects of age-related degradation of structures, systems, and components (SSCs). The research results of this multi-year collaboration will be utilized as input to seismic PRAs. In the Year 1 scope of work, BNL collected and reviewed degradation occurrences in US NPPs and identified important aging characteristics needed for the seismic capability evaluations. This information is presented in the Annual Report for the Year 1 Task, identified as BNL Report-81741-2008 and also designated as KAERI/RR-2931/2008. The report presents results of the statistical and trending analysis of this data and compares the results to prior aging studies. In addition, the report provides a description of U.S. current regulatory requirements, regulatory guidance documents, generic communications, industry standards and guidance, and past research related to aging degradation of SSCs. In the Year 2 scope of work, BNL carried out a research effort to identify and assess degradation models for the long-term behavior of dominant materials that are

  18. Technology Analysis of CO2 Capture and Storage in Firing Power Plant%火电厂CO2 CCS技术分析

    Institute of Scientific and Technical Information of China (English)

    胡月红

    2012-01-01

    After introducing the CO2 emission characteristics from firing power plant,this paper discussed two parts in both CO2 capture and storage,and put forward four main technological lines for CO2 capture in firing power plants.The paper also analyzed and compared the features and appliances of every capture measures,and pointed out some problems needed to be solved for using the existing capture methods to firing power plant in China.Finally it analyzed and summarized CO2 storage technology and comprehensive utilization.%介绍了火电厂CO2排放特点,将CO2减排技术分为捕集与封存两个部分进行讨论,提出了火电厂CO2捕集的4种主要技术路线;比较分析了几种主要捕集方法的技术特点和火力发电适用性,CO2应用于我国火电厂需解决的问题;综述了CO2的封存技术和综合利用。

  19. Integration of Variable Speed Pumped Hydro Storage in Automatic Generation Control Systems

    Science.gov (United States)

    Fulgêncio, N.; Moreira, C.; Silva, B.

    2017-04-01

    Pumped storage power (PSP) plants are expected to be an important player in modern electrical power systems when dealing with increasing shares of new renewable energies (NRE) such as solar or wind power. The massive penetration of NRE and consequent replacement of conventional synchronous units will significantly affect the controllability of the system. In order to evaluate the capability of variable speed PSP plants participation in the frequency restoration reserve (FRR) provision, taking into account the expected performance in terms of improved ramp response capability, a comparison with conventional hydro units is presented. In order to address this issue, a three area test network was considered, as well as the corresponding automatic generation control (AGC) systems, being responsible for re-dispatching the generation units to re-establish power interchange between areas as well as the system nominal frequency. The main issue under analysis in this paper is related to the benefits of the fast response of variable speed PSP with respect to its capability of providing fast power balancing in a control area.

  20. Entropy, pricing and macroeconomics of pumped-storage systems

    Science.gov (United States)

    Karakatsanis, Georgios; Mamassis, Nikos; Koutsoyiannis, Demetris; Efstratiadis, Andreas

    2014-05-01

    We propose a pricing scheme for the enhancement of macroeconomic performance of pumped-storage systems, based on the statistical properties of both geophysical and economic variables. The main argument consists in the need of a context of economic values concerning the hub energy resource; defined as the resource that comprises the reference energy currency for all involved renewable energy sources (RES) and discounts all related uncertainty. In the case of pumped-storage systems the hub resource is the reservoir's water, as a benchmark for all connected intermittent RES. The uncertainty of all involved natural and economic processes is statistically quantifiable by entropy. It is the relation between the entropies of all involved RES that shapes the macroeconomic state of the integrated pumped-storage system. Consequently, there must be consideration on the entropy of wind, solar and precipitation patterns, as well as on the entropy of economic processes -such as demand preferences on either current energy use or storage for future availability. For pumped-storage macroeconomics, a price on the reservoir's capacity scarcity should also be imposed in order to shape a pricing field with upper and lower limits for the long-term stability of the pricing range and positive net energy benefits, which is the primary issue of the generalized deployment of pumped-storage technology. Keywords: Entropy, uncertainty, pricing, hub energy resource, RES, energy storage, capacity scarcity, macroeconomics

  1. Power Plant Cycling Costs

    Energy Technology Data Exchange (ETDEWEB)

    Kumar, N.; Besuner, P.; Lefton, S.; Agan, D.; Hilleman, D.

    2012-07-01

    This report provides a detailed review of the most up to date data available on power plant cycling costs. The primary objective of this report is to increase awareness of power plant cycling cost, the use of these costs in renewable integration studies and to stimulate debate between policymakers, system dispatchers, plant personnel and power utilities.

  2. Assessment of the US EPA's determination of the role for CO2 capture and storage in new fossil fuel-fired power plants.

    Science.gov (United States)

    Clark, Victoria R; Herzog, Howard J

    2014-07-15

    On September 20, 2013, the US Environmental and Protection Agency (EPA) proposed a revised rule for "Standards of Performance for Greenhouse Gas Emissions from New Stationary Sources: Electric Utility Generating Units". These performance standards set limits on the amount of carbon dioxide (CO2) that can be emitted per megawatt-hour (MWh) of electricity generation from new coal-fired and natural gas-fired power plants built in the US. These limits were based on determinations of "best system of emission reduction (BSER) adequately demonstrated". Central in this determination was evaluating whether Carbon Dioxide Capture and Storage (CCS) qualified as BSER. The proposed rule states that CCS qualifies as BSER for coal-fired generation but not for natural gas-fired generation. In this paper, we assess the EPA's analysis that resulted in this determination. We are not trying to judge what the absolute criteria are for CCS as the BSER but only the relative differences as related to coal- vs natural gas-fired technologies. We conclude that there are not enough differences between "base load" coal-fired and natural gas-fired power plants to justify the EPA's determination that CCS is the BSER for coal-fired power plants but not for natural gas-fired power plants.

  3. Power System Stability of a Small Sized Isolated Network Supplied by a Combined Wind-Pumped Storage Generation System: A Case Study in the Canary Islands

    Directory of Open Access Journals (Sweden)

    Carlos A. Platero

    2012-07-01

    Full Text Available Massive integration of renewable energy sources in electrical power systems of remote islands is a subject of current interest. The increasing cost of fossil fuels, transport costs to isolated sites and environmental concerns constitute a serious drawback to the use of conventional fossil fuel plants. In a weak electrical grid, as it is typical on an island, if a large amount of conventional generation is substituted by renewable energy sources, power system safety and stability can be compromised, in the case of large grid disturbances. In this work, a model for transient stability analysis of an isolated electrical grid exclusively fed from a combination of renewable energy sources has been studied. This new generation model will be installed in El Hierro Island, in Spain. Additionally, an operation strategy to coordinate the generation units (wind, hydro is also established. Attention is given to the assessment of inertial energy and reactive current to guarantee power system stability against large disturbances. The effectiveness of the proposed strategy is shown by means of simulation results.

  4. Foundation Excavation Technology of Inlet/Outlet of Lower Reservoir in Xianju Pumped-storage Power Station%仙居抽水蓄能电站下水库进出水口基坑开挖技术

    Institute of Scientific and Technical Information of China (English)

    贾群超; 卢瑶; 陈金

    2014-01-01

    通常情况下,抽水蓄能电站下水库进出水口施工前期,多为静水中填筑土石高围堰,然后在围堰的挡护下进行下水库进出水口基坑施工,由于进出水口基坑狭小,边坡高陡,且周边已建设施较多,同时又受汛期影响,工期紧张。基坑开挖是进水口施工的首要工序,尤为重要,通过对仙居抽水蓄能电站下水库进出水口基坑开挖进行研究,总结了其开挖技术要点。%Under the normal circumstances, at the construction earlier stage of inlet / outlet of lower reservoir in Xianju Pumped-storage Power Station, in the ordinary course, the debris high cofferdam will be filled still in the water. The foundation excavation of inlet / outlet of lower reservoir is constructed under the cofferdam protection. Because of the narrow inlet and outlet foundation excavation, high and steep slope,many surrounding infrastructure facilities,meanwhile combined with the influence of the flood season, the construction period is very tight. The foundation excavation is the first step in the inlet / outlet construction. Through the research of foundation excavation technology of inlet / outlet of lower reservoir in Xianju Pumped-storage Power Station,the excavation key points are summarized.

  5. Smart intermittency-friendly cogeneration: Techno-economic performance of innovative double storage concept for integrating compression heat pumps in distributed cogeneration

    DEFF Research Database (Denmark)

    Blarke, Morten

    2011-01-01

    cogeneration plants rather than central power plants are giving way for wind power in the electricity mix. Could intermittent renewables be a threat to the system-wide energy, economic and environmental benefits that distributed cogeneration have to offer? This paper investigates how existing cogeneration...... plants may adapt their plant design and operational strategy to improve the co-existence between cogeneration and intermittent renewables. A novel intermittency-friendly and super-efficient concept in cogeneration is presented that involves integrating a high-pressure compression heat pump using heat...... recovered from flue gasses as the only low-temperature heat source, furthermore applying an intermediate cold storage allowing for non-concurrent operation of heat pump and cogeneration unit. The novel concept is subject to a detailed techno-economic comparative modelling and analysis, hich finds...

  6. Role of pump hydro in electric power systems

    Science.gov (United States)

    Bessa, R.; Moreira, C.; Silva, B.; Filipe, J.; Fulgêncio, N.

    2017-04-01

    This paper provides an overview of the expected role that variable speed hydro power plants can have in future electric power systems characterized by a massive integration of highly variable sources. Therefore, it is discussed the development of a methodology for optimising the operation of hydropower plants under increasing contribution from new renewable energy sources, addressing the participation of a hydropower plant with variable speed pumping in reserve markets. Complementarily, it is also discussed the active role variable speed generators can have in the provision of advanced frequency regulation services.

  7. Rethinking Pumped Storage Hydropower in the European Alps: A Call for New Integrated Assessment Tools to Support the Energy Transition

    Directory of Open Access Journals (Sweden)

    Astrid Björnsen Gurung

    2016-05-01

    Full Text Available The European Alps are well positioned to contribute significantly to the energy transition. In addition to sites with above-average potential for wind and solar power, the “water towers” of Europe provide flexible, low-carbon power generation as well as energy storage. In the future, hydropower systems are expected to become more than mere electricity generators, serving a key role as flexible complements to intermittent power generators and as providers of large-scale seasonal and daily energy storage. Energy transition on national and European scales can be facilitated by expanding the capacity of pumped storage hydropower (PSHP plants. Yet the extension of hydropower production, in particular PSHP, remains controversial, primarily due to environmental concerns. Focusing on 2 Alpine countries, Austria and Switzerland, this paper provides a system view of hydropower production and energy storage in the Alps. It discusses advantages and drawbacks of various assessment tools and identifies gaps and needs for the integrated assessment of PSHP plants. It concludes that instruments that evaluate the impacts and sustainability of PSHP projects need to be developed, elaborated, and applied in a participatory manner, in order to promote public dialogue, increase social acceptance, and, ideally, encourage energy consumers to become advocates of a sustainable energy future.

  8. Energy Storage Systems as a Compliment to Wind Power

    Science.gov (United States)

    Sieling, Jared D.; Niederriter, C. F.; Berg, D. A.

    2006-12-01

    As Gustavus Adolphus College prepares to install two wind turbines on campus, we are faced with the question of what to do with the excess electricity that is generated. Since the College pays a substantial demand charge, it would seem fiscally responsible to store the energy and use it for peak shaving, instead of selling it to the power company at their avoided cost. We analyzed six currently available systems: hydrogen energy storage, flywheels, pumped hydroelectric storage, battery storage, compressed air storage, and superconducting magnetic energy storage, for energy and financial suitability. Potential wind turbine production is compared to consumption to determine the energy deficit or excess, which is fed into a model for each of the storage systems. We will discuss the advantages and disadvantages of each of the storage systems and their suitability for energy storage and peak shaving in this situation.

  9. Some Technical Problems of Reversible Pump Turbine and in the Construction of Pumped-storage Power Stations%抽水蓄能电站建设及可逆式水泵水轮机的若干技术问题

    Institute of Scientific and Technical Information of China (English)

    端润生

    2012-01-01

    从混流可逆式水泵水轮机的选型问题、水泵水轮机全特性曲线、水轮机工况额定水头的选择、水力-机械过渡过程计算、上水库充水问题和首台机组首次启动方式等7个方面对中国抽水蓄能电站建设及可逆式水泵水轮机的若干技术问题进行了综述和分析,并就问题的解决提出了建议和对策.%Some technical problems of reversible pump turbine and in the construction of pumped-storage power stations in China are summarized and analyzed from seven aspects of the selection of Francis reversible pump turbine, the complete characteristics curve of pump turbine, the selection of rated head at turbine mode, the calculation of hydraulic-mechanical transition process, the water filling of upper reservoir and the first start -up mode of first unit. The suggestions and countermeasures for dealing with above problems are also put forward.

  10. Real-Time Dynamic Simulation of Korean Power Grid for Frequency Regulation Control by MW Battery Energy Storage System

    Directory of Open Access Journals (Sweden)

    Tae-Hwan Jin

    2016-12-01

    Full Text Available The aim of this study was to develop a real-time dynamic simulator of a power grid with power plant and battery model. The simulator was used to investigate the frequency control characteristics of a megawatt-scale high-capacity energy storage system connected to the electric power grid. In this study, a lithium-ion secondary battery was chosen as one of the batteries for a grid-connected model. The dynamics of the model was analysed in both steady and transient states. The frequency control system of the battery model plays a role in regulating the grid frequency by controlling the power of energy storage systems according to process variables and grid frequencies. The power grid model based on the current power network of South Korea, included power plants, substations and power demands. The power supply is classified by the type of turbine generator as thermal, nuclear, hydro power, pumped power storage, combined power plants, and batteries, including high-capacity energy storage systems rated for a maximum of 500 MW. This study deals with an installed capacity of 87.17 GW and peak load of 77.30 GW in the Korean power grid. For 24 hours of operation, the maximum and minimum power outputs were simulated as 61.59 GW and 46.32 GW, respectively. The commercialized real-time dynamic simulation software ProTRAX was used. The simulation was conducted to observe the operation characteristics of the frequency control system during a breakdown of power plants, as well as under governor-free operation, auto generation control operation, and with the battery energy storage system connected. The results show that the model is valid for each power plant breakdown simulation. They also confirm that the output power and frequency controls of the battery operated well during simulations.

  11. Combined thermal storage pond and dry cooling tower waste heat rejection system for solar-thermal steam-electric power plants. Final report

    Energy Technology Data Exchange (ETDEWEB)

    Guyer, E.C.; Bourne, J.G.; Brownell, D.L.; Rose, R.M.

    1979-02-28

    The thermal performance and economics of the combined thermal storage pond and dry cooling tower waste heat rejection system concept for solar-thermal steam-electric plants have been evaluated. Based on the computer simulation of the operation of southwest-sited solar-thermal plants, it has been determined that the combined pond-tower concept has significant cost and performance advantages over conventional dry cooling systems. Use of a thermal storage pond as a component of the dry cooling system allows a significant reduction in the required dry cooling heat exchange capacity and the associated parasitic power consumption. Importantly, it has been concluded that the combined pond-tower dry cooling system concept can be employed to economically maintain steam condensing temperatures at levels normally achieved with conventional evaporative cooling systems. An evaluation of alternative thermal storage pond design concepts has revealed that a stratified vertical-flow cut-and-fill reservoir with conventional membrane lining and covering would yield the best overall system performance at the least cost.

  12. Heavy Metal Pumps in Plants

    Energy Technology Data Exchange (ETDEWEB)

    Harper, J.F.

    2000-10-01

    The long term goal of the funded research is to understand how heavy metals are taken up from the soil and translocated throughout the plant. The potential application of this research is to create plants with better heavy metal uptake systems and thereby improve the ability of these plants to help clean up toxic metals from soils. A rate limiting step is using plant for bioremediation is the normally poor capacity of plants to concentrate toxic metals. Our interest in metal ion transport systems includes those for essential mineral nutrients such as molybdenum, copper, iron, manganese, as well as toxic metals such as cerium, mercury, cesium, cadmium, arsenic and selenium. Understanding the pathways by which toxic metals accumulate in plants will enable the engineering of plants to exclude toxic metals and create healthier food sources, or to extract toxic metals from the soil as a strategy to clean up polluted lands and water.

  13. Analysis of the Storage Capacity in an Aggregated Heat Pump Portfolio

    DEFF Research Database (Denmark)

    Nielsen, Kirsten Mølgaard; Andersen, Palle; Pedersen, Tom Søndergård

    2015-01-01

    Energy storages connected to the power grid will be of great importance in the near future. A pilot project has investigated more than 100 single family houses with heat pumps all connected to the internet. The houses have large heat capacities and it is possible to move energy consumption...

  14. Improving wind power quality with energy storage

    DEFF Research Database (Denmark)

    Rasmussen, Claus Nygaard

    2009-01-01

    The results of simulation of the influence of energy storage on wind power quality are presented. Simulations are done using a mathematical model of energy storage. Results show the relation between storage power and energy, and the obtained increase in minimum available power from the combination...... of wind and storage. The introduction of storage enables smoothening of wind power on a timescale proportional to the storage energy. Storage does not provide availability of wind power at all times, but allows for a certain fraction of average power in a given timeframe to be available with high...... probability. The amount of storage capacity necessary for significant wind power quality improvement in a given period is found to be 20 to 40% of the energy produced in that period. The necessary power is found to be 80 to 100% of the average power of the period....

  15. 21 CFR 878.4780 - Powered suction pump.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Powered suction pump. 878.4780 Section 878.4780...) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.4780 Powered suction pump. (a) Identification. A powered suction pump is a portable, AC-powered or compressed air-powered device intended to be...

  16. Optimized Pump Power Ratio on 2nd Order Pumping Discrete Raman Amplifier

    Institute of Scientific and Technical Information of China (English)

    Renxiang; Huang; Youichi; Akasaka; David; L.; Harris; James; Pan

    2003-01-01

    By optimizing pump power ratio between 1st order backward pump and 2nd order forward pump on discrete Raman amplifier, we demonstrated over 2dB noise figure improvement without excessive non-linearity degradation.

  17. EFFICIENCY OF THE USE OF HEAT PUMPS ON THE CHP PLANTS

    Directory of Open Access Journals (Sweden)

    Juravleov A.A.

    2007-04-01

    Full Text Available The work is dedicated to the calculus of the efficiency of the use of heat pumps on the CHP plants. There are presented the interdependences between the pay-back period and NPV of heat pump and the price of 1 kWt of thermal power of heat pump and of the tariff of electricity.

  18. Influence of individual heat pumps on wind power integration – Energy system investments and operation

    DEFF Research Database (Denmark)

    Hedegaard, Karsten; Münster, Marie

    2013-01-01

    Individual heat pumps are expected to constitute a significant electricity demand in future energy systems. This demand becomes flexible if investing in complementing heat storage capabilities. In this study, we analyse how the heat pumps can influence the integration of wind power by applying...

  19. Distributed Energy Systems with Wind Power and Energy Storage

    OpenAIRE

    Korpås, Magnus

    2004-01-01

    The topic of this thesis is the study of energy storage systems operating with wind power plants. The motivation for applying energy storage in this context is that wind power generation is intermittent and generally difficult to predict, and that good wind energy resources are often found in areas with limited grid capacity. Moreover, energy storage in the form of hydrogen makes it possible to provide clean fuel for transportation. The aim of this work has been to evaluate how local energy s...

  20. Distributed Energy Systems with Wind Power and Energy Storage

    OpenAIRE

    Korpås, Magnus

    2004-01-01

    The topic of this thesis is the study of energy storage systems operating with wind power plants. The motivation for applying energy storage in this context is that wind power generation is intermittent and generally difficult to predict, and that good wind energy resources are often found in areas with limited grid capacity. Moreover, energy storage in the form of hydrogen makes it possible to provide clean fuel for transportation. The aim of this work has been to evaluate how local energy s...

  1. Increasing wind energy penetration level using pumped hydro storage in island micro-grid system

    Energy Technology Data Exchange (ETDEWEB)

    Islam, Sheikh Mominul [Memorial Univ. of Newfoundland, St. John' s, NL (Canada). Dept. of Engineering

    2012-07-01

    Ramea is a small island in southern Newfoundland. Since 2004, it has a wind-diesel hybrid power system to provide power for approximately 600 inhabitants. In this paper, wind speed data, load data, and sizing of pumped hydro system at Ramea, Newfoundland are presented. The dynamic model of wind turbine, pumped hydro system, and diesel generator are included in this paper. The dynamic model is simulated in SIMULINK/MATLAB to determine the system voltage and frequency variation and also to visualize different power outputs. Sizing of pumped hydro system indicates that a 150-kW pumped hydro storage system can be installed in Ramea to increase the renewable energy fraction to 37% which will reduce non-renewable fuel consumption on this island. Also, it is found that a pumped hydro energy storage system for Ramea is a much better choice than a hydrogen energy storage system. Such a system will have a higher overall efficiency and could be maintained using local technical expertise, therefore, a more appropriate technology for Ramea. (orig.)

  2. Comparison of solar powered water pumping systems which use diaphragm pumps

    Science.gov (United States)

    Four solar photovoltaic (PV) powered diaphragm pumps were tested at different simulated pumping depths at the USDA-ARS Conservation and Production Research Laboratory near Bushland, Texas. Two of the pumps were designed for intermediate pumping depths (30 to 70 meters), and the other two pumps were...

  3. Reconciling Groundwater Storage Depletion Due to Pumping with Sustainability

    Directory of Open Access Journals (Sweden)

    Annukka Lipponen

    2010-11-01

    Full Text Available Groundwater pumping causes depletion of groundwater storage. The rate of depletion incurred by any new well is gradually decreasing and eventually becomes zero in the long run, after induced recharge and reduction of natural discharge of groundwater combined (capture have become large enough to balance the pumping rate completely. If aquifer-wide aggregated pumping rates are comparatively large, then such a new dynamic equilibrium may not be reached and groundwater storage may become exhausted. Decisions to pump groundwater are motivated by people’s need for domestic water and by expected benefits of using water for a variety of activities. But how much finally is abstracted from an aquifer (or is considered to be an optimal aggregate abstraction rate depends on a wide range of other factors as well. Among these, the constraint imposed by the groundwater balance (preventing aquifer exhaustion has received ample attention in the professional literature. However, other constraints or considerations related to changes in groundwater level due to pumping are observed as well and in many cases they even may dominate the decisions on pumping. This paper reviews such constraints or considerations, examines how they are or may be incorporated in the decision-making process, and evaluates to what extent the resulting pumping rates and patterns create conditions that comply with principles of sustainability.

  4. Nuclear Power Plants. Revised.

    Science.gov (United States)

    Lyerly, Ray L.; Mitchell, Walter, III

    This publication is one of a series of information booklets for the general public published by the United States Atomic Energy Commission. Among the topics discussed are: Why Use Nuclear Power?; From Atoms to Electricity; Reactor Types; Typical Plant Design Features; The Cost of Nuclear Power; Plants in the United States; Developments in Foreign…

  5. Power plant chemical technology

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1996-12-01

    17 contributions covering topies of fossil fuel combustion, flue gas cleaning, power plant materials, corrosion, water/steam cycle chemistry, monitoring and control were presented at the annual meeting devoted to Power Plant Chemical Technology 1996 at Kolding (Denmark) 4-6 September 1996. (EG)

  6. The Kuroshio power plant

    CERN Document Server

    Chen, Falin

    2013-01-01

    By outlining a new design or the Kuroshio power plant, new approaches to turbine design, anchorage system planning, deep sea marine engineering and power plant operations and maintenance are explored and suggested. The impact on the local environment, particularly in the face of natural disasters, is also considered to provide a well rounded introduction to plan and build a 30MW pilot power plant. Following a literature review, the six chapters of this book propose a conceptual design by focusing on the plant's core technologies and establish the separate analysis logics for turbine design and

  7. 张河湾电站垫层料变形模量试验研究%Experimental Study on Deformation Modulus of Bedding Materials in Zhanghewan Pumped-Storage Power Station

    Institute of Scientific and Technical Information of China (English)

    邹武; 包磊; 刘琼; 陈建飞

    2011-01-01

    Deformation modulus is an important indicator to measure the mechanical properties of geotechnical engineering. After excavating the reservoir slope on Hebei Zhanghewan Pumped-Storage Power Station,all weathered sandstone outcropped a lot, bedrock cracked and jointly developed, which made a big impact on the stability of asphalt concrete panel and reservoir bank base. By testing the particle size distribution, density,moisture content, penetration and deformation modulus of the filled bedding materials for ditch dam No. 5 of the reservoir on Zhanghewan Pumped-storage Power Station, we have checked the carrying and deformation resisting capacity of bedding materials,futher understood their stress-strain characteristics and thus provided a scientific basis for the analysis of safety and stability of the dam bedding materials.%变形模量是衡量岩土工程力学特性的一个重要指标,现场压板荷载试验计算变形模量是最直接有效的方法.河北张河湾抽水蓄能电站上水库边坡施工开挖后全强风化细砂岩出露较多,基岩裂隙和节理发育,对沥青混凝土面板和库岸基础的稳定性影响较大,通过对张河湾抽水蓄能电站上水库5号沟坝体填筑垫层料的颗粒级配、密度及含水率、渗透和变形模量的试验研究,校核了垫层料的承载能力及抵抗变形的能力,了解垫层料的应力位移特性,从而为坝体垫层料的安全稳定分析提供科学依据.

  8. Sorption pumps and storage for gases

    Science.gov (United States)

    Haaland, Peter; Bethel, Dylan

    2016-08-16

    A method and system for filling gas storage vessels from a source operates by cooling a sorbent, opening a valve to transfer gas by physisorption, regulating the sorbent temperature to achieve the desired degree of filling, closing the valve connecting to the gas source, and warming the tank, sorbent, and gas to provide a predetermined pressure at room temperature.

  9. Livestock water pumping with wind and solar power

    Science.gov (United States)

    Recent developments in pumping technologies have allowed for efficient use of renewable energies like wind and solar to power new pumps for remote water pumping. A helical type, positive displacement pump was developed a few years ago and recently modified to accept input from a variable power sourc...

  10. A Novel Constant-Pressure Pumped Hydro Combined with Compressed Air Energy Storage System

    Directory of Open Access Journals (Sweden)

    Erren Yao

    2014-12-01

    Full Text Available As intermittent renewable energy is receiving increasing attention, the combination of intermittent renewable energy with large-scale energy storage technology is considered as an important technological approach for the wider application of wind power and solar energy. Pumped hydro combined with compressed air energy storage system (PHCA is one of the energy storage systems that not only integrates the advantages but also overcomes the disadvantages of compressed air energy storage (CAES systems and pumped hydro energy storage systems to solve the problem of energy storage in China’s arid regions. Aiming at the variable working conditions of PHCA system technology, this study proposes a new constant-pressure PHCA. The most significant characteristics of this system were that the water pump and hydroturbine work under stable conditions and this improves the working efficiency of the equipment without incurring an energy loss. In addition, the constant-pressure PHCA system was subjected to energy and exergy analysis, in expectation of exploring an attractive solution for the large-scale storage of existing intermittent renewable energy.

  11. Maximizing Storage Flexibility in an Aggregated Heat Pump Portfolio

    DEFF Research Database (Denmark)

    Pedersen, Tom S.; Nielsen, Kirsten M.; Andersen, Palle

    2014-01-01

    To balance the electrical grid due to a large increase in the renewable energy production mainly from wind turbines will be a problem in the near future in Denmark. Smart grid solutions with new storage capacities are essential. In this work single family houses with heat pumps are investigated...

  12. Nuclear power plant maintainability.

    Science.gov (United States)

    Seminara, J L; Parsons, S O

    1982-09-01

    In the mid-1970s a general awareness of human factors engineering deficiencies associated with power plant control rooms took shape and the Electric Power Research Institute (EPRI) awarded the Lockheed Corporation a contract to review the human factors aspects of five representative operational control rooms and their associated simulators. This investigation revealed a host of major and minor deficiencies that assumed unforeseen dimensions in the post- Three Mile Island accident period. In the course of examining operational problems (Seminara et al, 1976) and subsequently the methods for overcoming such problems (Seminara et al, 1979, 1980) indications surfaced that power plants were far from ideal in meeting the needs of maintenance personnel. Accordingly, EPRI sponsored an investigation of the human factors aspects of power plant maintainability (Seminara, 1981). This paper provides an overview of the maintainability problems and issues encountered in the course of reviewing five nuclear power plants.

  13. 78 FR 26358 - Eagle Mountain Pumped Storage Hydroelectric Project, Eagle Crest Energy; Notice of Meeting With...

    Science.gov (United States)

    2013-05-06

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Eagle Mountain Pumped Storage Hydroelectric Project, Eagle Crest Energy...), on the Eagle Mountain Pumped Storage Hydroelectric Project. e. All local, state, and federal...

  14. 76 FR 22393 - Eagle Mountain Pumped Storage Hydroelectric Project, Eagle Crest Energy; Notice of Cancellation...

    Science.gov (United States)

    2011-04-21

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Eagle Mountain Pumped Storage Hydroelectric Project, Eagle Crest Energy... and Wildlife Service for the proposed Eagle Mountain Pumped Storage Hydroelectric Project....

  15. New simulation model of absorption pump with internal storage

    Energy Technology Data Exchange (ETDEWEB)

    San Juan, Cristina; Soutullo, Silvia; Enriquez, Ricardo; Ferrer, Jose Antonio; Heras, M Rosario [Energy Efficiency in Buildings R and D Unit. CIEMAT., Avenida Complutense 22, 28040 Madrid, (Spain)], email: cristina.sanjuan@ciemat.es

    2010-07-01

    In hot climates, such as in Spain, conditioning systems are used to provide a good level of thermal comfort during summer. Systems are usually composed of one liquid absorption pump and external storage in a water tank. The aim of this study is to present a new technology whereby energy is stored in crystallized salts through the use of 4 heat pumps. A case study was carried out in the Plataforma Solar de Almeria, Spain, where the performance of both conventional and new cooling systems were analyzed through the use of a dynamic model in TRNSYS. Results showed that for the new system, adaptability increases with the number of independent blocks and its performance is influenced by the control strategy. In addition it was found that 15m3 of external storage are required in conventional systems to achieve the same performance as the new system. This study showed that the new system requires less storage room than conventional systems.

  16. Foundation treatment for the alteration zones of underground powerhouse at Langyashan pumped storage power station%琅琊山抽水蓄能电站地下厂房蚀变岩带基础处理

    Institute of Scientific and Technical Information of China (English)

    姜成海; 王阳雪

    2013-01-01

    Steep dip thin limestone and granodiorite alteration zone were developed as the foundation of underground powerhouse at Langyashan pumped storage power station. The alteration zones distributed randomly and argillation as well as disintegration would occur as contact of water. Aiming at heteroge-neous rock foundation with limestone and granodiorite alteration zone, the method of whole rigidity box structure was adopted to solve the problem of insufficient carrying capacity and uneven settlement of the foundation. The result showed that it was of good effect and worthy reference.%琅琊山抽水蓄能电站地下厂房地基陡倾角薄层灰岩与花岗闪长蚀变岩带相间发育,其中蚀变岩带随机分布,遇水崩解泥化,强度较低。针对灰岩与蚀变岩相间的不均一岩性地基,采用整体刚性箱型基础结构,成功解决了地下厂房基础承载能力和不均匀沉降变形问题,为机组长期安全稳定运行奠定了基础,取得了良好的经济效益和社会效益。

  17. Inventory of future power and heat production technologies. Partial report Energy storage; Inventering av framtidens el- och vaermeproduktionstekniker. Delrapport Energilagring

    Energy Technology Data Exchange (ETDEWEB)

    Messing, Lars; Lindahl, Sture (Gothia Power AB, Goeteborg (Sweden))

    2008-12-15

    In this report a survey of different techniques for storage of electrical energy. The following alternatives are described regarding method, characteristics, potential and economy. Batteries; Capacitors; Flywheels; Pump storage hydro power plants; Hydrogen gas generation; Air compression. Regarding evaluation of methods for storage of electrical energy. Battery storage: The development of Lithium-ion batteries are of great interest. In the present situation it is however difficult of classify battery storage as a good alternation in applications with frequent re-charging cycles and re-charging of large energy volumes. The batteries have limited life length compared to other alternatives. Also the power is limited at charging and discharging. Energy storage in capacitors: 'Super-capacitors' having large power capacity is considered to be of interest in applications where fast control of power is necessary. The ongoing development of based on carbon-nanotubes will increase the energy storage capacity compared with the today existing super-capacitors. This can in the future be an alternative to battery storage. Of further interest is also the idea to combine battery and capacitor based storage to achieve longer life-time of the batteries and faster power control. Flywheel energy storage: The energy storage capacity is relatively limited but power control can be fast. This system can be an alternative to capacitor based energy storage. Pump-storage hydro power plant: This type of energy storage is well suited and proven for time frame up to some days. In the Swedish power system there is today not any large demand of energy storage in this time frame as there is a large capacity in conventional hydro power plants with storage capacity. Pump-storage can however be of interest in the southern part of Sweden. In some operation stages the grid is loaded up to its limit due to large power transmission from the north. The pump-storage can reduce this power transfer

  18. Experimental investigation of solar powered diaphragm and helical pumps

    Science.gov (United States)

    For several years, many types of solar powered water pumping systems were evaluated, and in this paper, diaphragm and helical solar photovoltaic (PV) powered water pumping systems are discussed. Data were collected on diaphragm and helical pumps which were powered by different solar PV arrays at mul...

  19. Assessment of power step performances of variable speed pump-turbine unit by means of hydro-electrical system simulation

    Science.gov (United States)

    Béguin, A.; Nicolet, C.; Hell, J.; Moreira, C.

    2017-04-01

    The paper explores the improvement in ancillary services that variable speed technologies can provide for the case of an existing pumped storage power plant of 2x210 MVA which conversion from fixed speed to variable speed is investigated with a focus on the power step performances of the units. First two motor-generator variable speed technologies are introduced, namely the Doubly Fed Induction Machine (DFIM) and the Full Scale Frequency Converter (FSFC). Then a detailed numerical simulation model of the investigated power plant used to simulate power steps response and comprising the waterways, the pump-turbine unit, the motor-generator, the grid connection and the control systems is presented. Hydroelectric system time domain simulations are performed in order to determine the shortest response time achievable, taking into account the constraints from the maximum penstock pressure and from the rotational speed limits. It is shown that the maximum instantaneous power step response up and down depends on the hydro-mechanical characteristics of the pump-turbine unit and of the motor-generator speed limits. As a results, for the investigated test case, the FSFC solution offer the best power step response performances.

  20. Large eddy simulation of a pumped- storage reservoir

    Science.gov (United States)

    Launay, Marina; Leite Ribeiro, Marcelo; Roman, Federico; Armenio, Vincenzo

    2016-04-01

    The last decades have seen an increasing number of pumped-storage hydropower projects all over the world. Pumped-storage schemes move water between two reservoirs located at different elevations to store energy and to generate electricity following the electricity demand. Thus the reservoirs can be subject to important water level variations occurring at the daily scale. These new cycles leads to changes in the hydraulic behaviour of the reservoirs. Sediment dynamics and sediment budgets are modified, sometimes inducing problems of erosion and deposition within the reservoirs. With the development of computer performances, the use of numerical techniques has become popular for the study of environmental processes. Among numerical techniques, Large Eddy Simulation (LES) has arisen as an alternative tool for problems characterized by complex physics and geometries. This work uses the LES-COAST Code, a LES model under development in the framework of the Seditrans Project, for the simulation of an Upper Alpine Reservoir of a pumped-storage scheme. Simulations consider the filling (pump mode) and emptying (turbine mode) of the reservoir. The hydraulic results give a better understanding of the processes occurring within the reservoir. They are considered for an assessment of the sediment transport processes and of their consequences.

  1. Advanced stellarator power plants

    Energy Technology Data Exchange (ETDEWEB)

    Miller, R.L.

    1994-07-01

    The stellarator is a class of helical/toroidal magnetic fusion devices. Recent international progress in stellarator power plant conceptual design is reviewed and comparisons in the areas of physics, engineering, and economics are made with recent tokamak design studies.

  2. Advanced stellarator power plants

    Energy Technology Data Exchange (ETDEWEB)

    Miller, R.L.

    1994-07-01

    The stellarator is a class of helical/toroidal magnetic fusion devices. Recent international progress in stellarator power plant conceptual design is reviewed and comparisons in the areas of physics, engineering, and economics are made with recent tokamak design studies.

  3. 76 FR 69720 - Don Pedro Hydro, LLC; Moccasin Pumped Storage, LLC; Notice of Competing Preliminary Permit...

    Science.gov (United States)

    2011-11-09

    ... the owners' express permission. DPH's proposed Don Pedro Pumped Storage Hydroelectric Project No...) and Moccasin Pumped Storage, LLC (Moccasin) filed ] preliminary permit applications, pursuant to.../91, Logan, UT 84321. (435) 752-2580. Moccasin's Moccasin Pumped Storage Project No. 14305-000 would...

  4. Discussion on management of low-rank coal storage in power plants%电厂低阶煤的存储管理探讨

    Institute of Scientific and Technical Information of China (English)

    曾彬; 沈朝峰; 秦岭; 张磊; 李小江

    2015-01-01

    The storage experimental research for lignite used for burning in power plant in Yunnan was done, combining with the monitoring circumstance of temperature increasing of coal dump, the primary analysis of storage loss of lignite was done, the control measurements of restraining coal dump self-ignition was proposed, it was also indicated that methods such as enhancing the coal dump temperature monitoring and compacting coal dump hierarchically could all prevent the self-ignition.%对云南某电厂燃用的褐煤开展存储试验研究,结合煤堆升温的监测情况,对褐煤的存储损耗进行初步分析,提出了抑制煤堆自燃的控制措施,指出可采取加强煤堆的测温监控及对煤堆进行分层压实等处理方法以预防煤堆自燃。

  5. Central receiver solar thermal power system, Phase 1. CDRL Item 2. Pilot plant preliminary design report. Volume V. Thermal storage subsystem. [Sensible heat storage using Caloria HT43 and mixture of gravel and sand

    Energy Technology Data Exchange (ETDEWEB)

    Hallet, Jr., R. W.; Gervais, R. L.

    1977-10-01

    The proposed 100-MWe Commercial Plant Thermal Storage System (TSS) employs sensible heat storage using dual liquid and solid media for the heat storage in each of four tanks, with the thermocline principle applied to provide high-temperature, extractable energy independent of the total energy stored. The 10-MW Pilot Plant employs a similar system except uses only a single tank. The high-temperature organic fluid Caloria HT43 and a rock mixture of river gravel and No. 6 silica sand were selected for heat storage in both systems. The system design, installation, performance testing, safety characteristics, and specifications are described in detail. (WHK)

  6. Power plant siting

    Energy Technology Data Exchange (ETDEWEB)

    Winter, J.V.; Conner, D.A.

    1978-01-01

    Just to keep up with expected demand, the US will need over 500 new power generation units by 1985. Where these power plants will be located is the subject of heated debate among utility officials, government leaders, conservationists, concerned citizens and a multitude of special interest groups. This book offers a balanced review of all of the salient factors that must be taken into consideration in selecting power plant locations. To deal with this enormously complex subject, the authors (1) offer a general overview of the history and reasoning behind present legislation on the state and national levels; (2) describe the many different agencies that have jurisdiction in power plant location, from local water authorities and city councils to state conservation boards and the Nuclear Regulatory Commission; and (3) include a state-by-state breakdown of siting laws, regulations and present licensing procedures. Architects, engineers, contractors, and others involved in plant construction and site evaluation will learn of the trade-offs that must be made in balancing the engineering, economic, and environmental impacts of plant location. The book covers such areas as availability of water supplies for generation or cooling; geology, typography, and demography of the proposed site; and even the selection of the fuel best suited for the area. Finally, the authors examine the numerous environmental aspects of power plant siting.

  7. Designing Self-powered Nanomotors and Pumps

    Science.gov (United States)

    Sen, Ayusman

    Self-powered nano and microscale moving systems are currently the subject of intense interest due in part to their potential applications in nanomachinery, nanoscale assembly, robotics, fluidics, and chemical/biochemical sensing. We will demonstrate that one can build autonomous nanomotors over a wide range of length-scales ``from scratch'' that mimic biological motors by using catalytic reactions to create forces based on chemical gradients. These motors are autonomous in that they do not require external electric, magnetic, or optical fields as energy sources. Instead, the input energy is supplied locally and chemically. These ''bots'' can be directed by information in the form of chemical and light gradients. Furthermore, we have developed systems in which chemical secretions from the translating nano/micromotors initiate long-range, collective interactions among themselves. This behavior is reminiscent of quorum sensing organisms that swarm in response to a minimum threshold concentration of a signaling chemical. In addition, an object that moves by generating a continuous surface force in a fluid can, in principle, be used to pump the fluid by the same catalytic mechanism. Thus, by immobilizing the nano/micromotors, we have developed nano/microfluidic pumps that transduce energy catalytically. These non-mechanical pumps provide precise control over flow rate without the aid of an external power source and are capable of turning on in response to specific analytes in solution.

  8. Nuclear Power Plants (Rev.)

    Energy Technology Data Exchange (ETDEWEB)

    Lyerly, Ray L.; Mitchell III, Walter [Southern Nuclear Engineering, Inc.

    1973-01-01

    Projected energy requirements for the future suggest that we must employ atomic energy to generate electric power or face depletion of our fossil-fuel resources—coal, oil, and gas. In short, both conservation and economic considerations will require us to use nuclear energy to generate the electricity that supports our civilization. Until we reach the time when nuclear power plants are as common as fossil-fueled or hydroelectric plants, many people will wonder how the nuclear plants work, how much they cost, where they are located, and what kinds of reactors they use. The purpose of this booklet is to answer these questions. In doing so, it will consider only central station plants, which are those that provide electric power for established utility systems.

  9. Energy performance and economic evaluation of heat pump/organic rankine cycle system with sensible thermal storage

    DEFF Research Database (Denmark)

    Carmo, Carolina; Dumont, Olivier; Nielsen, Mads Pagh

    2016-01-01

    -life conditions knowledge, the paper considers two different sensible energy storage (TES) configurations for the reversible heat pump/organic Rankine cycle (HP/ORC) system: a buffer tank for both space heating and domestic hot water and a hot water storage tank used exclusively for domestic hot water...... that consists of a ground-source heat pump with possibility of reversing operation as an ORC power cycle combined with solar heating in a single-family building is introduced. The ORC mode enables the use of solar energy in periods of no heat energy demand and reverses the heat pump cycle to supply electrical...

  10. Prediction versus actual response of rocks in an excavation of underground cavern at the Lam Ta Khong pumped storage project

    Energy Technology Data Exchange (ETDEWEB)

    Lertsgoon, P.N. [Electricity Generating Authority of Thailand, Bangkruai Nonthaburi (Thailand)

    2003-07-01

    The Lam Ta Khong Pumped Storage Project represents the first underground power plant in Thailand, and involves the excavation of a large underground cavern. Its dimensions are a 25 span, 175 metres long and 49 metres high. It is excavated in sandstone and siltstone and houses 4 power generator units capable of producing a maximum of 1000 mega watts (MW). The work was completed in 2000. The feasibility study revealed questionable properties of the siltstone which governs the ceiling of the cavern, due to a slacking phenomenon. A comparison between prediction and actual ground responses during excavation was performed for construction safety. PHASES and PHASE2 software were used for the prediction, while the actual rock response was obtained using a monitoring system. The parameters on rock properties from back calculation used in the design were made obvious by the correspondence between the prediction and the actual responses. 2 refs., 1 tab., 5 figs.

  11. Solar assisted absorption or motor driven heat pump with earth seasonal storage: Part 2, Tables and figures: Final report

    Energy Technology Data Exchange (ETDEWEB)

    Lazzarin, R.M.

    1986-01-01

    A plant composed of an energy roof, a seasonal earth storage and an absorption heat pump has been tested. The purpose was to study the behavior of the various components and their interaction. The surveys went on during two years. The following operations are considered: the charging of the earth storage by the energy roof and the working of an absorption heat pump connected either to the energy roof or to the earth storage. This volume contains all the figures and tables for the report. 77 figs., 24 tabs.

  12. Preliminary design study of underground pumped hydro and compressed-air energy storage in hard rock. Volume 2: Project design criteria: UPH

    Science.gov (United States)

    1981-05-01

    The design criteria for an underground pumped hydroelectric (JPH) storage facility having a maximum generating capacity of 2000 MW and a storage capacity of 20,000 MWh at a nominal head of 5000 ft are documented. The UPH facility is a two step configuration with single stage reversible pump turbines, each step consisting of a 1000 MW plant at a nominal head of 2500 ft. Overall design criteria including operating requirements, civil/structural criteria, geotechnical criteria, mechanical criteria and electrical criteria are detailed. Specific requirements are given for the upper reservoir, intake/outlet structure, penstock and draft tubes, powerhouses, transformer galleries, intermediate reservoir, lower reservoir, shafts and hoists, switchyard and surface buildings. The requirements for the power plant electrical and mechanical equipment, including pump turbine and motor generator units, are referred to. Electrical design criteria are given to meet the requirements of two power houses located underground at different depths, but these criteria may not necessarily reflect PEPCO's current engineering practice. The criteria refer to a specific site and take into account the site investigation results. The design criteria given were used as the basis for the plant design.

  13. 滨海核电站循环水泵膨胀密封的应用分析%Application&Analysis of the Inflatable Seal of the Circulating Water Pump in a Coastal Nuclear Power Plant

    Institute of Scientific and Technical Information of China (English)

    李振; 易琳; 张宇

    2015-01-01

    Based on the technical adaptation on the inflatable seal of circulating water pump, the reasons for the low success rate of the inflatable seal on site assembly has been described in the paper. The effects of different forms of the inflatable seal on the installation and maintenance work for the circulating water pump has also been analyzed and the application of the inflatable seal has been suggested in some domestic coastal nuclear power plants.%从描述循环水泵膨胀密封气囊技术改进入手,分析了膨胀密封现场组装成功率低的原因,讨论了不同形式膨胀密封对循环水泵安装和维修工作的影响,提出了国内部分核电站循环水泵膨胀密封的应用建议.

  14. Combining Wind and Pumped Hydro Energy Storage for Renewable Energy Generation in Ireland

    Directory of Open Access Journals (Sweden)

    Alice Coburn

    2014-01-01

    Full Text Available Ireland has one of the highest wind energy potentials in Europe. The intermittent nature of wind makes this renewable resource impractical as a sole source of energy. Combining wind energy with pumped hydro energy storage (PHES can overcome this intermittency, consuming energy during low-demand periods and supplying energy for periods of high demand. Currently Ireland has a number of hydroelectric power plants and wind farms of various scales in operation. A feasibility study was conducted to investigate the potential of securing a reliable source of renewable energy by increasing the penetration of hydroelectric power by means of combined wind-PHES developments. The greatest wind potential is experienced along the western coast of Ireland and a number of sites were identified here which satisfied a minimum mean wind speed criterion of 10.5 ms−1. Each site was then further evaluated according to topographical requirements for PHES. All but two of the identified sites are immediately unsuitable due to the presence of areas protected under European legislation; this highlights the nonenergy related obstacles in the path of renewable energy generation in Ireland and suggests that a compromise should be researched which could facilitate both renewable energy generation and species and habitat protection in Europe.

  15. Exploring the Roles and Key Points of Primavera Proj ect Planner Software in Pumped Storage Power Station Proj ect Management%探讨P3软件在抽水蓄能电站项目管理中的作用及要点

    Institute of Scientific and Technical Information of China (English)

    何平

    2014-01-01

    近年来,一大批大型抽水蓄能电站工程陆续开工建设,抽水蓄能电站建设项目是一项投资高、规模大、周期长的大型工程。本文首先介绍了P3软件的功能特点,结合抽水蓄能电站项目管理的特点和过程,分别从业主单位、监理单位、施工单位三方角度论述在抽水蓄能电站项目管理中应用 P3软件的重要作用,并探讨了在抽水蓄能电站管理中应用P3软件的几方面要点。%Recently,a large number of pumped storage power station proj ects have constructed successively,which have been seen as the large-scale proj ects of the high investment,large scale and long period.This paper described the features of Primav-era Proj ect Planner software,combined with the characteristics and process management of pumped storage power station pro-j ect.Then this paper analyzed respectively the important roles of owners,supervisions and constructions during the process of P3 software application in pumped storage power station proj ect management.Finally,this paper discussed several important points which were helpful to apply P3 software in pumped storage power station proj ect management.

  16. Recycling Waste Heat of Circulating Water Using Absorption Heat Pump in Thermal Power Plant%利用吸收式热泵回收热电厂循环水余热

    Institute of Scientific and Technical Information of China (English)

    石会群; 高立江

    2013-01-01

    Recycle the waste heat of circulating water in heating power to heat water by using type I absorption heat pump. In this paper, it introduces the original design parameters, the system scheme and the selection of units. In addition, it introduces the energy efficiency, environmental benefits and the question of the project. Through the presentation of the use of heat pump technology for recovery of waste heat from power plant, the technology is feasible, reliable, and is worthy of popularizing in northern heating power plant.%利用第一类吸收式热泵技术回收供热电厂冷却循环水余热用于城市供热,本文从设计的原始参数、系统方案和机组选型等进行介绍,并介绍了项目达到的节能效益、环保效益,以及方案存在的问题,通过说明利用热泵技术回收电厂余热技术是可行、可靠的,在北方供热电厂值得大力推广。

  17. Performance of a small wind powered water pumping system

    Science.gov (United States)

    Lorentz helical pumps (Henstedt-Ulzburg, Germany) have been powered by solar energy for remote water pumping applications for many years, but from October 2005 to March 2008 a Lorentz helical pump was powered by wind energy at the USDA-ARS Conservation and Production Research Laboratory (CPRL) near ...

  18. On the Use of Energy Storage Technologies for Regulation Services in Electric Power Systems with Significant Penetration of Wind Energy

    DEFF Research Database (Denmark)

    Yang, Bo; Makarov, Yuri; Desteese, John

    2008-01-01

    of a project work, recently conducted by the Pacific Northwest National Laboratory (PNNL) for Bonneville Power Administration (BPA). The project proposes to mitigate additional intermittency with the help of Wide Area Energy Management System (WAEMS) that would provide a two-way simultaneous regulation service...... and frequently changing regulation signal. Several energy storage options have been analyzed based on thirteen selection criteria. The evaluation process resulted in the selection of flywheels, pumped hydro electric power (or conventional hydro electric power) plant and sodium sulfur or nickel cadmium batteries...

  19. Energy storage in future power systems

    DEFF Research Database (Denmark)

    Rasmussen, Claus Nygaard; Østergaard, Jacob; Divya, K. C.

    2011-01-01

    Most sources of renewable power are characterised by uncontrollable and chaotic variations in power output. We here look at how energy storage may benefit renewable power generation by making it available in periods with little or no intermittent generation and thereby prevent additional...... conventional generation form being used. In addition to this, one of the strongest concerns in relation to renewable power is the instability in the electric power system that it may introduce as a result of large and relatively fast power fluctuations. An additional benefit of energy storage is therefore its...... of renewable energy. Meanwhile, the insurance of power system stability through reduction of power gradients is of major importance even at lower penetration levels and some form of energy storage therefore seems unavoidable. A variety of technologies are available for storage of energy in the power system...

  20. Energy storage in future power systems

    DEFF Research Database (Denmark)

    Rasmussen, Claus Nygaard; Østergaard, Jacob; Divya, K. C.

    2011-01-01

    Most sources of renewable power are characterised by uncontrollable and chaotic variations in power output. We here look at how energy storage may benefit renewable power generation by making it available in periods with little or no intermittent generation and thereby prevent additional...... conventional generation form being used. In addition to this, one of the strongest concerns in relation to renewable power is the instability in the electric power system that it may introduce as a result of large and relatively fast power fluctuations. An additional benefit of energy storage is therefore its...... of renewable energy. Meanwhile, the insurance of power system stability through reduction of power gradients is of major importance even at lower penetration levels and some form of energy storage therefore seems unavoidable. A variety of technologies are available for storage of energy in the power system...

  1. Highly-efficient high-power pumps for fiber lasers

    Science.gov (United States)

    Gapontsev, V.; Moshegov, N.; Berezin, I.; Komissarov, A.; Trubenko, P.; Miftakhutdinov, D.; Berishev, I.; Chuyanov, V.; Raisky, O.; Ovtchinnikov, A.

    2017-02-01

    We report on high efficiency multimode pumps that enable ultra-high efficiency high power ECO Fiber Lasers. We discuss chip and packaged pump design and performance. Peak out-of-fiber power efficiency of ECO Fiber Laser pumps was reported to be as high as 68% and was achieved with passive cooling. For applications that do not require Fiber Lasers with ultimate power efficiency, we have developed passively cooled pumps with out-of-fiber power efficiency greater than 50%, maintained at operating current up to 22A. We report on approaches to diode chip and packaged pump design that possess such performance.

  2. Preliminary design study of underground pumped hydro and compressed-air energy storage in hard rock. Volume 8: Design approaches: UPH

    Science.gov (United States)

    1981-06-01

    The development of the design approaches used to determine the plant and overall layout for a underground pumped hydroelectric (UPH) storage facility having a maximum generating capacity of 2000 MW and a storage capacity of 20,000 MWh is discussed. Key factors were the selection of the high head pump-turbine equipment and the geotechnical considerations relevant to the underground cavern designs. The comparison of pump-turbine alternatives is described leading to the selection for detailed study of both a single-step configurations, using multistage reversible pump-turbines, and a two-step configuration, with single-stage reversible pump-turbines.

  3. Noise Exposure Level in Workers of a Pumped Storage Power Station%某抽水蓄能电站运行人员噪声暴露水平检测与分析

    Institute of Scientific and Technical Information of China (English)

    刘跟生

    2013-01-01

    [ Objective ] To evaluate noise exposure levels of workers in pumped storage power stations. [ Methods ] Individual noise exposure levels in 2 patrolling workplaces and 1 control room and in both operating and alternative conditions were measured. A mathematical calculation based on individual exposure level and exposure time was used to evaluate workers' noise exposure of 42 h per week which was then converted to the time equivalent continuous A-weighted sound pressure level (Laeq) of 40 h per week. [ Results ] In this study, the noise exposure levels in 2 patrolling workplaces and 1 control room were measured 3 times a day in both operating and alternative conditions. The workers' Laeq of 42 h per week was 62.1 dB (A) . After conversion, the workers' Laeq of 40h per week was 62.3 dB (A). [ Conclusion ] The noise exposure levels of workers in pumped storage power station do not exceed the occupational exposure limit of 85dB (A) prescribed in Occupational exposure limits for hazardous agents in the workplace Part 2: Physical agents.%[目的]分析抽水蓄能电站运行人员的噪声暴露水平. [方法]检测运行人员在运行工况及备用工况每次巡检时的接噪强度以及巡检后控制室的噪声强度,结合运行人员在不同情况下的接噪时间,计算运行人员在四值三运转的工作制度下,1周42h接触噪声强度的等效声级,进而换算至1周40h接触噪声强度的等效声级. [结果]本研究共检测6次运行工况及3次备用工况下的个体噪声及控制室噪声,经过计算分析,得出运行人员1周42h接触噪声的等效连续A声级为62.1 dB(A),换算至1周40h接触噪声的等效连续A声级为62.3 dB(A). [结论]抽水蓄能电站运行人员的噪声暴露水平未超过《工作场所有害因素职业接触限值第2部分:物理因素》(GBZ 2.2-2007)中规定的职业接触限值85dB(A).

  4. 溧阳抽水蓄能电站混凝土配合比优化%Optimization of Concrete Mix Proportion in Liyang Pumped-storage Power Station

    Institute of Scientific and Technical Information of China (English)

    兰肃; 吴书艳

    2013-01-01

    溧阳抽水蓄能电站初期混凝土配合比试验表明,与同标准混凝土比较,单位胶凝材料及用水量较大,且抗冻指标难以满足设计要求,分析其原因为砂石骨料石粉含量高所致.通过加强料源开采的管理、改造砂石加工系统等措施,降低了骨料中小于0.075 mm颗粒的含量,并提出了混凝土优化配合比,满足了用水量和抗冻指标要求,降低了胶凝材料用量,达到了经济目标.%The early concrete mix proportion testes for Liyang Pumped-storage Power Station show that, comparing with standard concrete, the cement and water utilization in concrete is larger and the frost indexes are difficult to meet design requirements. The study shows that higher powder content in gravel aggregate is the cause. By strengthening raw material mining management and transforming aggregate processing system to reduce the content of particles with a size less than 0.075 mm in aggregate, and optimizing the mix proportion of concrete, the water utilization and frost resistance of concrete meet the requirements of design, and the cement utilization is reduced to achieve economic target.

  5. Solar assisted absorption or motor driven heat pump with earth seasonal storage: Part 1, Final report, 1 July 1982-30 June 1985

    Energy Technology Data Exchange (ETDEWEB)

    Lazzarin, R.M.

    1986-01-01

    A plant composed of an energy roof, a seasonal earth storage and an absorption heat pump has been tested. The purpose was to study the behavior of the various components and their interaction. The surveys went on during two years. The following operations are considered: the charging of the earth storage by the energy roof and the working of an absorption heat pump connected either to the energy roof or to the earth storage.

  6. 核电循环泵轴承冷却风扇结构及其流场分析%Structure and Flow Field Analysis of Bearing Cooling Fans of the Circulating Cooling Water Pump in a Nuclear Power Plant

    Institute of Scientific and Technical Information of China (English)

    吴明哲; 王晓冬; 孙德臣

    2016-01-01

    The circulating cooling water pump in a nuclear power plant operates in a high temperature environment,and the pump bearing receives a large amount of heat load,so the work reliability is of great importance.To reduce the bearing’s working temperature and ensure its safe operation,a cooling device should be installed in the pump system.The structure of the bearing’s axial flow cooling fan in the pump was proposed,and the optimum design method of the bearing’s axial flow cooling fan in the pump was established.For the fan blades,the optimized calculation using BFGS algorithm was proceeded.A simulation verification of the system was proposed by using FLUENT,whose results showed that the design method is suitable for the bearing’s axial flow cooling fan design in circulating cooling water pumps in a nuclear power plant.%核电站冷却水循环泵在高温环境下工作,泵轴承受到很大的热负载,其工作可靠性至关重要。为降低轴承工作温度、保证轴承安全工作,在泵轴系统上设置了冷却装置。提出了泵轴承冷却用轴流式风扇的结构,建立了风扇结构的 BFGS 优化计算方法,采用计算流体力学软件 FLUENT 对风扇流场进行了数值分析。数值模拟结果表明,基于 BFGS 设计方法得到的冷却风扇性能有较好的设计计算精度,能够满足核电站冷却水循环泵轴承冷却的要求,该计算方法方便可行。

  7. Multiplex tokamak power plant

    Energy Technology Data Exchange (ETDEWEB)

    Dabiri, A.E.

    1986-07-01

    The concept of multiplexing for a fusion power core as an option for producing power is explored. Superconducting, as well as normal magnet, coils in either first or second stability regimes are considered. The results show that multiplex plants with superconducting magnets operating in the second stability regime could be competitive with the single-unit plants in some unit sizes. The key issues that impact the expected benefits of multiplexing must be investigated further. These are factory fabrication, economy of scale, the extent of equipment sharing, inherent safety, maintainability, and utility load management.

  8. Mines as lower reservoir of an UPSH (Underground Pumping Storage Hydroelectricity): groundwater impacts and feasibility

    Science.gov (United States)

    Bodeux, Sarah; Pujades, Estanislao; Orban, Philippe; Dassargues, Alain

    2016-04-01

    The energy framework is currently characterized by an expanding use of renewable sources. However, their intermittence could not afford a stable production according to the energy demand. Pumped Storage Hydroelectricity (PSH) is an efficient possibility to store and release electricity according to the demand needs. Because of the topographic and environmental constraints of classical PSH, new potential suitable sites are rare in countries whose topography is weak or with a high population density. Nevertheless, an innovative alternative is to construct Underground Pumped Storage Hydroelectricity (UPSH) plants by using old underground mine works as lower reservoir. In that configuration, large amount of pumped or injected water in the underground cavities would impact the groundwater system. A representative UPSH facility is used to numerically determine the interactions with surrounding aquifers Different scenarios with varying parameters (hydrogeological and lower reservoir characteristics, boundaries conditions and pumping/injection time-sequence) are computed. Analysis of the computed piezometric heads around the reservoir allows assessing the magnitude of aquifer response and the required time to achieve a mean pseudo-steady state under cyclic solicitations. The efficiency of the plant is also evaluated taking the leakage into the cavity into account. Combining these two outcomes, some criterions are identified to assess the feasibility of this type of projects within potential old mine sites from a hydrogeological point of view.

  9. Development of a control system for evaluation of renewable power plants in the water pumping; Desenvolvimento de um sistema de controle para avaliacao de fontes de energias renovaveis no bombeamento de agua

    Energy Technology Data Exchange (ETDEWEB)

    Presenco, Jose Fernando [Universidade Estadual Paulista (FCA/UNESP), Botucatu, SP (Brazil). Fac. de Ciencias Agronomicas. Pos-graduacao em Agronomia; Seraphim, Odivaldo Jose [Universidade Estadual Paulista (FCA/UNESP), Botucatu, SP (Brazil). Fac. de Ciencias Agronomicas. Dept. de Engenharia Rural

    2010-07-01

    The use of alternative energy systems in the current days is an urgent necessity due to the problems that the planet is facing as the heating and loss of ozone layer. The scarcity of conventional energy is another problem that must be solved for the future of humanity. It must be considered that the people are inhabiting places moved away not always with available energy. The application of technologies as automation and control can help us to solve this problem. Therefore, this work aimed at apply an equipment of industrial usage, the Programmable Logical Controller, PLC, in alternative energies systems, as eolic generation and photovoltaic generation used for water pumping, aiming the automatic control and the efficiency in the places where it has simultaneous availability of these sources, based in criterion of priority that previously established itself between them. It was made a hydraulic and energetic evaluation of the energy system, eolic and photovoltaic, used in the automatic control system of pumping, in the place of accomplishment of the experiment, according to previously established physical conditions. The results have shown that the control system using the PLC is practicable and has trustworthiness. The program developed can be adapted for the use with several power plants in a specific application place. The photovoltaic system of pumping, using a polycrystalline of 70 Watts connected to a pump Shurflo 8000, showed to be efficient with significant flows in almost all the months. The eolic system of pumping, using an eolic generator of 400 Watts assembled in place of experiment, did not demonstrate energetic capacity for use in this specific type of application. (author)

  10. Pumping slots: impedances and power losses

    Energy Technology Data Exchange (ETDEWEB)

    Kurennoy, S. [Maryland Univ., College Park, MD (United States). Dept. of Physics

    1996-08-01

    Contributions of pumping slots to the beam coupling impedances and power losses in a B-factory ring are considered. While their leading contribution is to the inductive impedance, for high-intensity machines with short bunches like e{sup +}e{sup -} B-factories the real part of the impedance and related loss factors are also important. Using an analytical approach we calculate the coupling impedances and loss factors due to slots in a ring with an arbitrary cross section of the vacuum chamber. Effects of the slot tilt on the beam impedance are also considered, and restrictions on the tilt angle are derived from limitations on the impedance increase. The power leakage through the slots is discussed briefly. The results are applied to the KEK B-factory. (author)

  11. 印尼ADIPALA电厂取水头和泵房内漩涡治理物理模型试验研究%Experimental study on vortex control measure of water intake and pump station for ADIPALA power plant

    Institute of Scientific and Technical Information of China (English)

    刘海成; 刘军其; 周华兴

    2012-01-01

    In this paper,the current characteristics near water intake,box culvert,fore bay and flow channel were studied according to the water intake and pump house hydraulic physical model test for Indonesia ADIPALA power plant. For the original design,there was harmful air-core vortex near water intake and diversion piers in pump house flow channel.Based on the analysis of vortex appearing, different control measures were used to eliminate the vortex,and ensure the safety of power plant.%通过印尼ADIPALA电厂循环冷却水取水口和取水泵房的水工物理模型试验,研究了电厂循环冷却水在取水口、引水箱涵、前池、流道等处的水流特性.试验中发现,在原设计方案中,取水口和分流墩附近出现了有害的串状吸气漩涡.文章通过对漩涡出现原因进行分析,采用了不同的治理措施,有效消除了漩涡,保证了电厂取水安全.

  12. Induction generator-induction motor wind-powered pumping system

    Energy Technology Data Exchange (ETDEWEB)

    Miranda, M.S.; Lyra, R.O.C.; Silva, S.R. [CPDEE - UFMG, Belo Horizonte (Brazil)

    1997-12-31

    The energy storage matter plays an important role in wind-electric conversion systems for isolated applications. Having that in mind, two different approaches can be basically considered: either the immediate conversion of the generated electric energy, as in a water pumping system or electric energy storage for later use, as in a battery charging system. Due to some features such as no need of an external reactive power source and, sometimes, a gearbox, permanent-magnet synchronous generators have been broadly used in low rated power isolated systems. Despite that, system performance can be affected when the generator is feeding an inductive load (e.g., an induction motor) under variable-speed-variable-frequency operational conditions. Since there is no effective flux control, motor overload may occur at high wind speeds. Thus, good system performance can be obtained through additional control devices which may increase system cost. Although being rugged and cheap, induction machines always work as a reactive power drain; therefore, they demand an external reactive power source. Considering that, reactive static compensators appear as an attractive alternative to the cost x performance problem. In addition to that, different control strategies can be used so that system performance can be improved.

  13. Nuclear Power Plant Technician

    Science.gov (United States)

    Randall, George A.

    1975-01-01

    The author recognizes a body of basic knowledge in nuclear power plant technoogy that can be taught in school programs, and lists the various courses, aiming to fill the anticipated need for nuclear-trained manpower--persons holding an associate degree in engineering technology. (Author/BP)

  14. Nuclear Power Plant Technician

    Science.gov (United States)

    Randall, George A.

    1975-01-01

    The author recognizes a body of basic knowledge in nuclear power plant technoogy that can be taught in school programs, and lists the various courses, aiming to fill the anticipated need for nuclear-trained manpower--persons holding an associate degree in engineering technology. (Author/BP)

  15. GEOTHERMAL POWER GENERATION PLANT

    Energy Technology Data Exchange (ETDEWEB)

    Boyd, Tonya

    2013-12-01

    Oregon Institute of Technology (OIT) drilled a deep geothermal well on campus (to 5,300 feet deep) which produced 196oF resource as part of the 2008 OIT Congressionally Directed Project. OIT will construct a geothermal power plant (estimated at 1.75 MWe gross output). The plant would provide 50 to 75 percent of the electricity demand on campus. Technical support for construction and operations will be provided by OIT’s Geo-Heat Center. The power plant will be housed adjacent to the existing heat exchange building on the south east corner of campus near the existing geothermal production wells used for heating campus. Cooling water will be supplied from the nearby cold water wells to a cooling tower or air cooling may be used, depending upon the type of plant selected. Using the flow obtained from the deep well, not only can energy be generated from the power plant, but the “waste” water will also be used to supplement space heating on campus. A pipeline will be construction from the well to the heat exchanger building, and then a discharge line will be construction around the east and north side of campus for anticipated use of the “waste” water by facilities in an adjacent sustainable energy park. An injection well will need to be drilled to handle the flow, as the campus existing injection wells are limited in capacity.

  16. Geothermal Power Generation Plant

    Energy Technology Data Exchange (ETDEWEB)

    Boyd, Tonya [Oregon Inst. of Technology, Klamath Falls, OR (United States). Geo-Heat Center

    2013-12-01

    Oregon Institute of Technology (OIT) drilled a deep geothermal well on campus (to 5,300 feet deep) which produced 196°F resource as part of the 2008 OIT Congressionally Directed Project. OIT will construct a geothermal power plant (estimated at 1.75 MWe gross output). The plant would provide 50 to 75 percent of the electricity demand on campus. Technical support for construction and operations will be provided by OIT’s Geo-Heat Center. The power plant will be housed adjacent to the existing heat exchange building on the south east corner of campus near the existing geothermal production wells used for heating campus. Cooling water will be supplied from the nearby cold water wells to a cooling tower or air cooling may be used, depending upon the type of plant selected. Using the flow obtained from the deep well, not only can energy be generated from the power plant, but the “waste” water will also be used to supplement space heating on campus. A pipeline will be construction from the well to the heat exchanger building, and then a discharge line will be construction around the east and north side of campus for anticipated use of the “waste” water by facilities in an adjacent sustainable energy park. An injection well will need to be drilled to handle the flow, as the campus existing injection wells are limited in capacity.

  17. 应用吸收式热泵提高热电厂经济效能研究%Study of the Application of an Absorption Heat Pump to Improve the Thermal Power Plant Economic Performance

    Institute of Scientific and Technical Information of China (English)

    张琰; 刘广建; 胡三高

    2012-01-01

    In order to improve the economic efficiency of thermal power plant, according to the principle of heat pump, using Thermoflow professional software to simulate a subcritical 600MW once reheat heating unit, tur- bine 0.4MPa, 250℃ heating steam extraction as a heat source to the urban heating network, heat supply for 440GJ / h. On this basis to stimulate analog absorption heat pump heating system by using 0.4MPa, 250 ℃ steam ex- traction as absorption heat pump driven steam to improve the taste of the circulating cooling water. In the case of constant heat supply, the simulation results confirmed the thermal power plant using absorption heat pump heating method, compared to traditional methods of heating, which can help power plants each year to save 767966 .- 1053453GJ heat, 26204 - 35945 tons of standard coal and reduce 69702 - 95613 tons of greenhouse gas emissions.%为了提高热电厂供热经济效能,以热泵原理的研究为基础,利用Thermoflow专业软件模拟一台亚临界600MW一次中间再热供热机组,直接以汽轮机0.4MPa,250℃抽汽作为热源向城市热网供热,供热量为440GJ/h。在此基础上对选用吸收式热泵技术回收低温余热供热的新系统进行模拟,以汽轮机0.4MPa,250℃抽汽作为吸收式热泵的驱动蒸汽,提高循环冷却水的品位供热。在供热量不变的情况下,模拟结果证实热电厂采用吸收式热泵的供热方法和传统直接以汽轮机抽汽为热源的供热方法相比,可以帮助电厂每年节省767966~1053453GJ的热量,节省标准煤26204~35945吨,同时减少排放温室气体CO269702~95613吨。说明吸收式热泵对于余热的回收可以产生巨大的经济效益和环境效益。

  18. Preliminary Feasibility Study of a Hybrid Solar and Modular Pumped Storage Hydro System at Biosphere 2

    Energy Technology Data Exchange (ETDEWEB)

    Lansey, Kevin [Univ. of Arizona, Tucson, AZ (United States); Hortsman, Chris [Univ. of Arizona, Tucson, AZ (United States)

    2016-10-01

    In this study, the preliminary feasibility of a hybrid solar and modular pumped storage system designed for high energy independence at Biosphere 2 is assessed. The system consists of an array of solar PV panels that generate electricity during the day to power both Biosphere 2 and a pump that sends water through a pipe to a tank at a high elevation. When solar power is not available, the water is released back down the pipe towards a tank at a lower elevation, where it passes through a hydraulic water turbine to generate hydroelectricity to power Biosphere 2. The hybrid system is sized to generate and store enough energy to enable Biosphere 2 to operate without a grid interconnection on an average day.

  19. Economics of hybrid photovoltaic power plants

    Energy Technology Data Exchange (ETDEWEB)

    Breyer, Christian

    2012-08-16

    coal fired power plants, wind power, solar thermal power (STEG) and hydro power plants. For the 2010s, detailed global demand curves are derived for hybrid PV-Fossil power plants on a per power plant, per country and per fuel type basis. The fundamental technical and economic potentials for hybrid PV-STEG, hybrid PV-Wind and hybrid PV-Hydro power plants are considered. The global resource availability for PV and wind power plants is excellent, thus knowing the competitive or complementary characteristic of hybrid PV-Wind power plants on a local basis is identified as being of utmost relevance. The complementarity of hybrid PV-Wind power plants is confirmed. As a result of that almost no reduction of the global economic PV market potential need to be expected and more complex power system designs on basis of hybrid PV-Wind power plants are feasible. The final target of implementing renewable power technologies into the global power system is a nearly 100% renewable power supply. Besides balancing facilities, storage options are needed, in particular for seasonal power storage. Renewable power methane (RPM) offers respective options. A comprehensive global and local analysis is performed for analysing a hybrid PV-Wind-RPM combined cycle gas turbine power system. Such a power system design might be competitive and could offer solutions for nearly all current energy system constraints including the heating and transportation sector and even the chemical industry. Summing up, hybrid PV power plants become very attractive and PV power systems will very likely evolve together with wind power to the major and final source of energy for mankind.

  20. Numerical and experimental study on heat pump water heater with PCM for thermal storage

    Energy Technology Data Exchange (ETDEWEB)

    Long, Jian-You; Zhu, Dong-Sheng [Key Laboratory of Enhanced Heat Transfer and Energy Conservation of the Ministry of Education, Academy of Chemistry and Energy, South China University of Technology, Guangzhou, Guangdong 510640 (China)

    2008-07-01

    An air source heat pump water heater with phase change material (PCM) for thermal storage was designed to take advantage of off-peak electrical energy. The heat transfer model of PCM was based upon a pure conduction formulation. Quasi-steady state method was used to calculate the temperature distribution and phase front location of PCM during thermal storage process. Temperature and thermal resistance iteration approach has been developed for the analysis of temperature variation of heat transfer fluid (HTF) and phase front location of PCM during thermal release process. To test the physical validity of the calculational results, experimental studies about storing heat and releasing heat of PCM were carried. Comparison between the calculational results and the experimental data shows good agreement. Graphical results including system pressure and input power of heat pump, time-wise variation of stored and released thermal energy of PCM were presented and discussed. (author)

  1. Compressed air energy storage power plants as an option for the grid integration of renewable energy sources. A comparison of the concepts; Druckluftspeicherkraftwerke als Option zur Netzintegration erneuerbarer Energiequellen. Ein Vergleich der Konzepte

    Energy Technology Data Exchange (ETDEWEB)

    Tuschy, Ilja [Fachhochschule Flensburg (Germany). Inst. fuer Energiesystemtechnik

    2008-07-01

    The integration of an increasing amount of power generation from renewable energy sources is a large challenge for the electricity supply. Apart from the compensation of varying production by supra-regional grids and apart from the further development of peak load power stations the energy storage is discussed as an option. Several power suppliers referred to compressed air energy storage plants as a possible solution. The authors of the contribution under consideration compare the different concepts for compressed air energy power stations systematically. A special emphasis is the thermodynamic evaluation of the different concepts. Also energy-technical aspects are addressed which decide on possibilities of application and perspectives of development for compressed air energy power stations.

  2. Feasibility Analysis of Retread to Essential Service Water Pump Shaft Seal of Nuclear Power Plant%核电站重要厂用水泵的轴封改造

    Institute of Scientific and Technical Information of China (English)

    宋立; 林冲; 吴希曦; 李志山

    2014-01-01

    设计了一款适用于现有CPR1000堆型核电站重要厂用水泵的机械密封,并通过对重要厂用水泵的正常运行工况和事故工况进行分析,提出重要厂用水泵用机械密封替换填料密封后可能出现的事故运行工况,制定了正常运行使用Plan 32,轴封水中断事故时切换到Plan 14的综合机械密封冲洗方案。通过鉴定试验验证,在CRP1000堆型重要厂用水泵上换装机械密封用以替代现有的填料密封,是可以满足正常运行和事故条件下的使用要求的。%One mechanical seal was designed for the shaft sealing of essential service water pump of CPR1000 nuclear power plant.According to the normal and accidental condition analysis of the essential service water pump,the general flashing plan was established.The Plan32 is used during normal condition and Plan14 will be used during flashing water interrupted.This de-sign was validated by the qualification test.The test result approved that it is feasible to use the mechanical seal instead of pack-ing seal for the essential service water pump of CPR1000 nuclear power plant.

  3. A systematic outline of the system combination of solar thermal power plants and heat pumps; Systematische Gliederung der Systemkombination von solarthermischen Anlagen und Waermepumpen

    Energy Technology Data Exchange (ETDEWEB)

    Haller, Michel Y.; Frank, Elimar [Hochschule fuer Technik HSR, Rapperswil (Switzerland). SPF Inst. fuer Solartechnik; Trinkl, Christoph; Zoerner, Wilfried [Hochschule Ingolstadt (Germany). Kompetenzfeld Erneuerbare Energien

    2010-07-01

    In recent years, increasingly systems for heat supply for space heating and hot water were developed based on the combination of solar thermal systems and heat pumps up to serial production. The manufacturers or suppliers either come from the solar energy industry or from the heat pump sector and accordingly have the specific background knowledge in one of these two technologies. Thus, two different approaches for the conceptual design of system solutions are identifiable. Under this aspect, the authors of the contribution under consideration report on the actual classification in solar thermal systems and heat pumps as well as a systematic outline concept for combined solar heat pump systems.

  4. Preliminary design study of underground pumped hydro and compressed-air energy storage in hard rock. Volume 5: Site selection

    Science.gov (United States)

    1981-04-01

    A six-step site selection process undertaken to identify and subsequently rank potential sites suitable for either an underground pumped hydroelectric (UPH) facility, or a water-compensated hard-rock cavern compressed air energy storage (CAES) facility is described. The region of study was confined to the service area of the Potomac Electric Power Company (PEPCO) and contiguous areas. Overriding considerations related to geology, environmental impact and transmission-line routing were studies within the context of minimizing plant costs. The selection process led to the identification of several sites suitable for the development of either a CAES or an UPH facility. Design development and site exploration at the selected site are described.

  5. Iowa Hill Pumped Storage Project Investigations - Final Technical Report

    Energy Technology Data Exchange (ETDEWEB)

    Hanson, David [Sacramento Municipal Unitlity District, Sacramento, CA (United States)

    2016-07-01

    This Final Technical Report is a summary of the activities and outcome of the Department of Energy (DOE) Assistance Agreement DE-EE0005414 with the Sacramento Municipal Utility District (SMUD). The Assistance Agreement was created in 2012 to support investigations into the Iowa Hill Pumped-storage Project (Project), a new development that would add an additional 400 MW of capacity to SMUD’s existing 688MW Upper American River Hydroelectric Project (UARP) in the Sierra Nevada mountains east of Sacramento, California.

  6. 高水头抽水蓄能电站球阀与导叶联动的关闭规律研究%Study on Linkage Closing Rule between Ball Valve and Guide Vane in High Head Pumped Storage Power Station

    Institute of Scientific and Technical Information of China (English)

    张春; 杨建东

    2011-01-01

    针对高水头抽水蓄能电站机组甩负荷问题,以某抽水蓄能电站为例,采用导叶直线关闭规律及球阀与导叶联动的关闭规律进行探讨,并基于水泵水轮机全特性曲线进行数值模拟.结果表明,该规律能有效削减机组流量和蜗壳压力的第2峰值,最大值仍发生于第1波峰,而第1峰值则取决导叶初始(第1段)的关闭速度.%Aiming at the load shedding of hydroelectric sets in high head pumped storage power station, taking a pumped storage power station for an example, this paper discusses the straight-line closing rule of guide vane and linkage closing rule between ball valve and guide vane. And then the numerical calculation of pumped storage power station is simulated in terms of pump-turbine characteristic curve. The results show that the linkage closing rule can effectively reduce turbine flow and the second peak value of spiral case pressure while the maximum pressure remains to occur the first wave crest; the first peak pressure of spiral case depends on the initial (the first straight-line ) closing rate of the guide vane.

  7. Underground Pumped Storage Hydropower using abandoned open pit mines: influence of groundwater seepage on the system efficiency

    Science.gov (United States)

    Pujades, Estanislao; Bodeux, Sarah; Orban, Philippe; Dassargues, Alain

    2016-04-01

    Pumped Storage Hydropower (PSH) plants can be used to manage the production of electrical energy according to the demand. These plants allow storing and generating electricity during low and high demand energy periods, respectively. Nevertheless, PSH plants require a determined topography because two reservoirs located at different heights are needed. At sites where PSH plants cannot be constructed due to topography requirements (flat regions), Underground Pumped Storage Hydropower (UPSH) plants can be used to adjust the electricity production. These plants consist in two reservoirs, the upper one is located at the surface (or at shallow depth) while the lower one is underground (or deeper). Abandoned open pit mines can be used as lower reservoirs but these are rarely isolated. As a consequence, UPSH plants will interact with surrounding aquifers exchanging groundwater. Groundwater seepage will modify hydraulic head inside the underground reservoir affecting global efficiency of the UPSH plant. The influence on the plant efficiency caused by the interaction between UPSH plants and aquifers will depend on the aquifer parameters, underground reservoir properties and pumping and injection characteristics. The alteration of the efficiency produced by the groundwater exchanges, which has not been previously considered, is now studied numerically. A set of numerical simulations are performed to establish in terms of efficiency the effects of groundwater exchanges and the optimum conditions to locate an UPSH plant.

  8. Grid Connection Scheduling Strategy for Pumped-storage and Wind Power Based on Spinning Reserve and Output Prediction%基于旋转备用和出力预测的风电抽水蓄能并网调度策略

    Institute of Scientific and Technical Information of China (English)

    陈峦; 陈池

    2011-01-01

    以风电场出力短期预测和电网提供的旋转备用容量为依据,提出了一种风电抽水蓄能并网发电调度策略.在建立系统数学模型的基础上,进行了仿真试验,讨论了电网旋转备用容量大小变化对风电抽水蓄能并网系统性能的影响.通过3种不同特征风速样本的对比仿真试验,分析了抽水蓄能并网系统在不同特征风速下的运行差异.仿真结果表明,所提出的调度策略有效、可行.%Based on the short-term forecast of wind farm output and the spinning reserve capacity of grid, an operation scheduling strategy for wind power and pumped-storage power system is proposed. After establishing the mathematical model, the simulation tests are conducted and the impacts of grid spinning reserve capacity on the performances of wind power and pumped-storage power system are studied. By comparing the simulations of three typical wind speeds, the differences of pumped-storage power operation are analyzed. The simulating results show that the proposed scheduling strategy is effective and feasible.

  9. A solar power plant

    Energy Technology Data Exchange (ETDEWEB)

    Avakyan, Yu.V.; Dabagyan, T.N.; Gagiyan, L.A.; Kharapetyan, G.S.; Vartanyan, A.V.

    1984-01-01

    This invention is designed for solar energy collectors in the form of heat pipes. A solar power plant is proposed that contains a solar concentrator in the form of at least one heat pipe with evaporation and condensation sections, the first of which is constructed to absorb solar emission and the second located in a heat exchanger equipped with inlet and outlet pipes. In order to simplify the design, the solar power plant is equipped with an additional heat exchanger connected through a connector to the inlet and outlet pipes, while the evaporation section holds an additional section in the lower half, within the auxiliary heat exchanger. During operation as a solar energy collector, the evaporation region absorbs the solar energy and converts it to heat, which is then carried by the heat transfer medium to the heating tube.

  10. Thermal energy storage for CSP (Concentrating Solar Power

    Directory of Open Access Journals (Sweden)

    Py Xavier

    2017-01-01

    Full Text Available The major advantage of concentrating solar power before photovoltaic is the possibility to store thermal energy at large scale allowing dispatchability. Then, only CSP solar power plants including thermal storage can be operated 24 h/day using exclusively the solar resource. Nevertheless, due to a too low availability in mined nitrate salts, the actual mature technology of the two tanks molten salts cannot be applied to achieve the expected international share in the power production for 2050. Then alternative storage materials are under studies such as natural rocks and recycled ceramics made from industrial wastes. The present paper is a review of those alternative approaches.

  11. Thermal energy storage for CSP (Concentrating Solar Power)

    Science.gov (United States)

    Py, Xavier; Sadiki, Najim; Olives, Régis; Goetz, Vincent; Falcoz, Quentin

    2017-07-01

    The major advantage of concentrating solar power before photovoltaic is the possibility to store thermal energy at large scale allowing dispatchability. Then, only CSP solar power plants including thermal storage can be operated 24 h/day using exclusively the solar resource. Nevertheless, due to a too low availability in mined nitrate salts, the actual mature technology of the two tanks molten salts cannot be applied to achieve the expected international share in the power production for 2050. Then alternative storage materials are under studies such as natural rocks and recycled ceramics made from industrial wastes. The present paper is a review of those alternative approaches.

  12. ORC-mall scale power plant

    Energy Technology Data Exchange (ETDEWEB)

    Jokinen, T. [Helsinki Univ. of Technology, Otaniemi (Finland). Lab. of Electromechanics

    1998-12-31

    In the conversion of low temperature heat into electricity, the greatest efficiency is obtained by using a Rankine cycle. The Organic Rankine cycle (ORC) is a Rankine cycle where an organic fluid is used instead of water as the working fluid. In the conventional ORC-solution, an axial turbine drives a standard generator through a high-speed gearbox. The system includes a separate feed pump, vacuum pump, lubrication system and requires several saft seals. The seals of the turbine have a limited working life in particular due to the high speed required. Thus, the entire present conventional ORC-plant is rather complicated and requires maintenance. To avoid these problems, a project was initiated at the Lappeenranta University of Technology to develop a high-speed, process fluid lubricated turbogenerator-feed pump as the prime mover of the ORC. The project has been continued in co-operation with the Helsinki University of Technology under the NEMO 2 program, the main goal being to build a demonstration power plant and to commercialise the project. The goals of the project were: (1) to model the ORC process, turbogenerator, and inverter, (2) to simulate the power plant in different normal and abnormal states, (3) to assess the advantages and disadvantages of various control systems, (4) to study network disturbances such as voltage and current harmonics and to research ways of reducing these disturbances, (5) to optimise heat exchanging surfaces and process parameters, and (6) to participate in the design of the demonstration power plant

  13. Compact inductive energy storage pulse power system.

    Science.gov (United States)

    K, Senthil; Mitra, S; Roy, Amitava; Sharma, Archana; Chakravarthy, D P

    2012-05-01

    An inductive energy storage pulse power system is being developed in BARC, India. Simple, compact, and robust opening switches, capable of generating hundreds of kV, are key elements in the development of inductive energy storage pulsed power sources. It employs an inductive energy storage and opening switch power conditioning techniques with high energy density capacitors as the primary energy store. The energy stored in the capacitor bank is transferred to an air cored storage inductor in 5.5 μs through wire fuses. By optimizing the exploding wire parameters, a compact, robust, high voltage pulse power system, capable of generating reproducibly 240 kV, is developed. This paper presents the full details of the system along with the experimental data.

  14. Energy storage for power systems

    CERN Document Server

    Ter-Gazarian, Andrei

    2011-01-01

    The supply of energy from primary sources is not constant and rarely matches the pattern of demand from consumers. Electricity is also difficult to store in significant quantities. Therefore, secondary storage of energy is essential to increase generation capacity efficiency and to allow more substantial use of renewable energy sources that only provide energy intermittently. Lack of effective storage has often been cited as a major hurdle to substantial introduction of renewable energy sources into the electricity supply network.This 2nd edition, without changing the existing structure of the

  15. Economic Analysis of the Virtual Power Plants with Large-scale Battery Energy Storage Systems%含规模化电池储能系统的商业型虚拟电厂经济性分析

    Institute of Scientific and Technical Information of China (English)

    闫涛; 渠展展; 惠东; 刘赟甲; 胡娟; 贾鹏飞

    2014-01-01

    In order to solve the two major problems in the new energy power generation process,namely,the difficultly in dynamic energy balance and high system operation costs,an operation mode of energy storage system based on the commercial virtual power plant(VPP) is put forward by referring to a demonstration project with wind power plants and energy storage systems.On the basis of the adoption of the objective function of VPP economic benefits and that of the benefits and costs of wind power plant and battery energy storage systems,an economical dispatching model for VPP able to provide services to peak load shifting and frequency control,is developed.With the goal of maximizing the profits in each period,the output power of wind power plants and battery energy storage systems is obtained by the simulated annealing algorithm.By referring to the data of electricity price of typical areas in China and the cost of typical battery energy storage system in operation,an example is presented to show that the adoption of the VPP operation mode proposed is able to yield greater benefits.%为解决新能源发电过程中功率动态平衡困难、系统投资成本高昂两大突出问题,结合国内某风储系统示范项目,提出基于商业型虚拟电厂(virtual power plant,VPP)的储能系统运行方式。在建立 VPP 经济收益的目标函数以及风力发电厂和电池储能系统的收益、成本等数学模型的基础上,建立了可提供调峰和调频服务的 VPP 经济优化调度模型。以各时段内获得收益最大为目标,采用模拟退火算法计算得到风力发电厂和电池储能系统的出力。参考中国典型地区电价和已经投运的典型电池储能系统的成本为数据,构造算例进行分析。算例分析表明采用 VPP 运行方式可获得更大的收益。

  16. Energy storage options for space power

    Science.gov (United States)

    Hoffman, H. W.; Martin, J. F.; Olszewski, M.

    Including energy storage in a space power supply enhances the feasibility of using thermal power cycles (Rankine or Brayton) and providing high-power pulses. Superconducting magnets, capacitors, electrochemical batteries, thermal phase-change materials (PCM), and flywheels are assessed; the results obtained suggest that flywheels and phase-change devices hold the most promise. Latent heat storage using inorganic salts and metallic eutectics offers thermal energy storage densities of 1500 kJ/kg to 2000 kJ/kg at temperatures to 1675 K. Innovative techniques allow these media to operate in direct contact with the heat engine working fluid. Enhancing thermal conductivity and/or modifying PCM crystallization habit provide other options. Flywheels of low-strain graphite and Kevlar fibers have achieved mechanical energy storage densities of 300 kJ/kg. With high-strain graphite fibers, storage densities appropriate to space power needs (about 500 kJ/kg) seem feasible. Coupling advanced flywheels with emerging high power density homopolar generators and compulsators could result in electric pulse-power storage modules of significantly higher energy density.

  17. Nuclear Power Plant

    Directory of Open Access Journals (Sweden)

    Analia Bonelli

    2012-01-01

    Full Text Available A description of the results for a Station Black-Out analysis for Atucha 2 Nuclear Power Plant is presented here. Calculations were performed with MELCOR 1.8.6 YV3165 Code. Atucha 2 is a pressurized heavy water reactor, cooled and moderated with heavy water, by two separate systems, presently under final construction in Argentina. The initiating event is loss of power, accompanied by the failure of four out of four diesel generators. All remaining plant safety systems are supposed to be available. It is assumed that during the Station Black-Out sequence the first pressurizer safety valve fails stuck open after 3 cycles of water release, respectively, 17 cycles in total. During the transient, the water in the fuel channels evaporates first while the moderator tank is still partially full. The moderator tank inventory acts as a temporary heat sink for the decay heat, which is evacuated through conduction and radiation heat transfer, delaying core degradation. This feature, together with the large volume of the steel filler pieces in the lower plenum and a high primary system volume to thermal power ratio, derives in a very slow transient in which RPV failure time is four to five times larger than that of other German PWRs.

  18. 高压变频器在火电厂凝结水泵上的应用%The application of high voltage inverter in the coal-fired power plant condensate pump

    Institute of Scientific and Technical Information of China (English)

    花雨; 张德本

    2013-01-01

      介绍深圳妈湾电厂5、6号机组凝结水泵变频改造方案,阐述了高压变频器的安装调试情况及其控制策略,运行结果显示变频改造后电动机节能效果显著。%The article introduces frequency conversion recon-struction scheme of condensate pump for Shenzhen Mawan power plant unit 5, and 6.This paper expounds the installation and debug-ging situation of high voltage frequency converter and its control strategy. Operation results show that the frequency conversion re-construction after motor energy saving effect is remarkable, and im-prove the motor operating conditions.

  19. 固体吸附式空调/热泵在火电厂中的应用研究%STUDY ON APPLYING SOLID-ADSORPTION AIR CONDITIONING / HEAT PUMP IN THERMAL POWER PLANT

    Institute of Scientific and Technical Information of China (English)

    李中华; 王如竹; 刘建军; 柳正军; 刘洪文

    2001-01-01

    采用新型固体吸附式制冷技术开发了电站锅炉排污热回收系统。该系统可直接回收排污热进行空调制冷,并对电厂热力系统进行热泵供热,不但节约大量空调用电,而且提高了机组热经济性,具有显著的节能效果。%A heat recovery system of discharged waste water from boilers in thermal power plant was developed. The recovered heat can be used to drive solid-adsorption refrigerator for air conditioning and supply heat to heat-pump for thermal system, reducing greatly the electricity consumption of air conditioning, improving thermal efficiency of generating units, resulting in obvious energy-saving effect.

  20. 吸收式热泵用于热电联产改造新技术%The Co-production of New Technology Transformation of Usage of Absorption Hot-pump to Recycle Waste Heat in Heat Power Plant

    Institute of Scientific and Technical Information of China (English)

    茹毅; 王飞

    2012-01-01

    热电厂的循环冷却水系统存在大量的低位热能。热泵系统具有将低位热能提升为高位热能的能力。本文即是根据山西某热电厂的节能改造方案介绍了利用吸收式热泵系统回收电厂冷凝余热用于集中供热的新技术;并对新型供热系统做出能效和经济性评价,认为新技术应用具有经济和环境的双重效益,有广阔发展前景。%There is a large number of low level heat energy in the circulating cooling water system of thermal power plant.Heat pump system has the ability to improve the heat energy level from low order into high order.This article introduced the new technology,application to central heating,of usage of absorption high temperature heat pump system for recycling waste heat of condensation which based on the energy-saving reform plan of one heat-power plant in Shanxi province.Based on the new central heating systems the energy efficiency and economic evaluation be giving in this paper.Through the analysis shows that the application of new technology has the double effect in economic efficiency and environmental protection that has broad prospects for development.

  1. Analog Fixed Maximum Power Point Control for a PWM Step-downConverter for Water Pumping Installations

    DEFF Research Database (Denmark)

    Beltran, H.; Perez, E.; Chen, Zhe

    2009-01-01

    This paper describes a Fixed Maximum Power Point analog control used in a step-down Pulse Width Modulated power converter. The DC/DC converter drives a DC motor used in small water pumping installations, without any electric storage device. The power supply is provided by PV panels working around...

  2. Wind power plant system services

    DEFF Research Database (Denmark)

    Basit, Abdul; Altin, Müfit

    Traditionally, conventional power plants have the task to support the power system, by supplying power balancing services. These services are required by the power system operators in order to secure a safe and reliable operation of the power system. However, as in the future the wind power...... is going more and more to replace conventional power plants, the sources of conventional reserve available to the system will be reduced and fewer conventional plants will be available on-line to share the regulation burden. The reliable operation of highly wind power integrated power system might...... then beat risk unless the wind power plants (WPPs) are able to support and participate in power balancing services. The objective of this PhD project is to develop and analyse control strategies which can increase the WPPs capability to provide system services, such as active power balancing control...

  3. 抽水蓄能机组背靠背启动中跳闸技术改造方案%Transformation on the Fault Trip during Back-to-back Starting of Pumped-storage Power Station

    Institute of Scientific and Technical Information of China (English)

    常永亮; 张兵海; 王勇; 何忠华

    2011-01-01

    针对抽水蓄能机组在背靠背拖动过程中若发生电气或机械故障跳闸,当跳开拖动机组和被拖动机组的灭磁开关的时间差过大时,会在启动回路中产生很大的短路电流,引起继电保护误动作,严重时会损毁启动回路的电气设备,提出一种抽水蓄能机组背靠背跳闸技术改造方案,通过在机组保护系统中添加“跳相邻机组单元”接点,与“跳本机组”接点同时动作,达到同时跳开拖动和被拖动机组灭磁开关的目的.技术改造后的试验证明了方案的正确性和有效性.%When the trip is occurred during the back-to-back starting of pumped-storage units as electrical or mechanical faults and there is a larger time difference between the field breaking switches, the large short -circuit current will be generated in the starting circuits and leads to the malfunction of relay protection, even to damage the electrical equipments of starting circuit in a severe condition. A trip transformation was presented for the back-to-back starting of pumped-storage units, in which, the contact of "Breaking adjacent unit" was added in protection system and will be simultaneously operated with the contact of "Breaking local unit" to meet the requirements on breaking the units on the same time. The tests show that the transformation program is effective.

  4. Operation Optimization of Constant-speed Circulating Water Pumps in a Thermal Power Plant under Full Conditions%火电机组定速循环水泵的全工况运行优化

    Institute of Scientific and Technical Information of China (English)

    刘吉臻; 王玮; 曾德良; 常太华; 柳玉

    2011-01-01

    为解决枚举法得出的定速循环水泵最优运行方式的局限性,通过分析汽轮机低压缸、冷却塔及凝汽器真空的全工况计算模型,提出了在环境温度相等的前提下进行循环水泵全工况运行优化,并对其流程进行了阐述,将排汽压力对汽轮机功率的修正曲线进行了全工况拟合,利用二分法求解机组各工况下循环水泵相邻运行方式的等效益点,进而获得等效益曲线,并采用二分法对某电厂的定速循环水泵进行了等效益曲线实例验证.结果表明:循环水泵优化运行后,平均可降低煤耗0.594g/(kw·h).%In order to overcome the limitation of optimized operation of constant-speed circulating water pumps obtained by enumeration method, the idea of optimizing the operation of circulating water pumps under full conditions was proposed on the premise of equal inlet temperature of cooling water, based on a- nalysis of full-condition calculation models for low-pressure cylinder, cooling tower and condenser vacuum. The specific optimization process is to fit the corrective curve between turbine power and exhaust pressure under full conditions, then to solve the equal efficiency points between adjacent operating modes of circu- lating water pumps by dichotomy method, and finally to acquire the equal efficiency curves. Verification results on the equal efficiency curves in a certain power plant show that an average of 0. 594 g/(kw .h) net coal consumption can be saved after the optimization of relevant circulating water pumps.

  5. Study of hybrid power system potential to power agricultural water pump in mountain area

    Energy Technology Data Exchange (ETDEWEB)

    Syuhada, Ahmad, E-mail: syuhada-mech@yahoo.com; Mubarak, Amir Zaki, E-mail: amir-zaki-mubarak@yahoo.com; Maulana, M. Ilham, E-mail: mil2ana@yahoo.com [Mechanical Engineering Department, Engineering Faculty, Syiah Kuala University Jl. Syech Abdul Rauf No.7 Darussalam Banda Aceh 23111 (Indonesia)

    2016-03-29

    As industry and Indonesian economy grow fast, there are a lot of agricultural land has changed into housing and industrial land. This causes the agricultural land moves to mountain area. In mountainous agricultural area, farmers use the water resources of small rivers in the groove of the mountain to irrigate the farmland. Farmers use their power to lift up water from the river to their land which causes inefectivity in the work of the farmers. Farmers who have capital utilize pump to raise water to their land. The only way to use pump in mountain area is by using fuel energy as there is no electricity, and the fuel price in mountain area is very expensive. Based on those reasons it is wise to consider the exploration of renewable energy available in the area such as solar energy, wind energy and hybrid energy. This study analyses the potential of the application of hybrid power plant, which is the combination of solar and wind energy, to power agricultural pump. In this research, the data of wind speed and solar radiation are collected from the measurement of BMKG SMPK Plus Sare. Related to the solar energy, the photovoltaic output power calculation is 193 W with duration of irradiation of 5 hours/day. While for the wind energy, the output power of the wind turbine is 459.84 W with blade diameter of 3 m and blow duration of 7 hours/day. The power of the pump is 558 W with 8 hours of usage, and the water capacity is 2.520 liters/hour for farmland with the area of 15 ha. Based on the analysis result, the designed system will generate electricity of 3.210 kW/year with initial investment of US$ 14,938.

  6. Study of hybrid power system potential to power agricultural water pump in mountain area

    Science.gov (United States)

    Syuhada, Ahmad; Mubarak, Amir Zaki; Maulana, M. Ilham

    2016-03-01

    As industry and Indonesian economy grow fast, there are a lot of agricultural land has changed into housing and industrial land. This causes the agricultural land moves to mountain area. In mountainous agricultural area, farmers use the water resources of small rivers in the groove of the mountain to irrigate the farmland. Farmers use their power to lift up water from the river to their land which causes inefectivity in the work of the farmers. Farmers who have capital utilize pump to raise water to their land. The only way to use pump in mountain area is by using fuel energy as there is no electricity, and the fuel price in mountain area is very expensive. Based on those reasons it is wise to consider the exploration of renewable energy available in the area such as solar energy, wind energy and hybrid energy. This study analyses the potential of the application of hybrid power plant, which is the combination of solar and wind energy, to power agricultural pump. In this research, the data of wind speed and solar radiation are collected from the measurement of BMKG SMPK Plus Sare. Related to the solar energy, the photovoltaic output power calculation is 193 W with duration of irradiation of 5 hours/day. While for the wind energy, the output power of the wind turbine is 459.84 W with blade diameter of 3 m and blow duration of 7 hours/day. The power of the pump is 558 W with 8 hours of usage, and the water capacity is 2.520 liters/hour for farmland with the area of 15 ha. Based on the analysis result, the designed system will generate electricity of 3.210 kW/year with initial investment of US 14,938.

  7. 发电厂除灰泵浆体水击压强的计算与分析%The Calculation and Analysis of Water-hammer of Liquid-Solid Two -Phase Flow for Ash-Water Pump in Steam Power Plant

    Institute of Scientific and Technical Information of China (English)

    周云龙; 孙斌; 蒋诚

    2001-01-01

    The calculations and analysis on water hammer pressure of liquid-solid two-phase flow and the round velocity of turning back of the pump on ash-water pump in st e am power plant have been done. Based on the calculation results, some protection s against water-hammer for ash-water pump have been presented.%对某电厂除灰泵进行了浆体水击压强及反向转速的计算与分析,根据计算结果提出了除灰泵的水击防护措施。

  8. Regulation of the wind power production. Contribution of the electric vehicles and other energy storage systems

    Energy Technology Data Exchange (ETDEWEB)

    Mateus, Carlos B. [Instituto de Meteorologia, Lisboa (Portugal); Estanqueiro, Ana [INETI/LNEG - National Laboratory for Energy and Geology, Lisbon (Portugal)

    2012-07-01

    The increase in penetration of variable renewable energy sources (RES) introduced additional difficulties regarding the management of the Portuguese Power System. This is mainly due to the high temporal variability and low controllability, characteristics of these kinds of sources. There is a real need to reduce the impact of non-dispatchable RES sources; maximizing their penetration and minimizing curtailment. This is especially true for wind power and run-of-the-river hydro (ROR); as it appears beneficial to combine their variable production with added capacity of energy storage and demand side management; thereby increasing the flexibility of the power system as a whole. This paper aims to assess the excess wind generation (and other non-dispatchable sources); this for periods of production's excess in a 2020 timeframe, and assuming different weather scenarios. The adjustment of wind power generation (WPG) profile to the load profile is also addressed; the result is computed in the form of the value of the energy temporally deferred, using Pumped Hydro Storage (PHS) power plants as well as electric Vehicles (EVs). (orig.)

  9. THERMOCHEMICAL HEAT STORAGE FOR CONCENTRATED SOLAR POWER

    Energy Technology Data Exchange (ETDEWEB)

    PROJECT STAFF

    2011-10-31

    Thermal energy storage (TES) is an integral part of a concentrated solar power (CSP) system. It enables plant operators to generate electricity beyond on sun hours and supply power to the grid to meet peak demand. Current CSP sensible heat storage systems employ molten salts as both the heat transfer fluid and the heat storage media. These systems have an upper operating temperature limit of around 400 C. Future TES systems are expected to operate at temperatures between 600 C to 1000 C for higher thermal efficiencies which should result in lower electricity cost. To meet future operating temperature and electricity cost requirements, a TES concept utilizing thermochemical cycles (TCs) based on multivalent solid oxides was proposed. The system employs a pair of reduction and oxidation (REDOX) reactions to store and release heat. In the storage step, hot air from the solar receiver is used to reduce the oxidation state of an oxide cation, e.g. Fe3+ to Fe2+. Heat energy is thus stored as chemical bonds and the oxide is charged. To discharge the stored energy, the reduced oxide is re-oxidized in air and heat is released. Air is used as both the heat transfer fluid and reactant and no storage of fluid is needed. This project investigated the engineering and economic feasibility of this proposed TES concept. The DOE storage cost and LCOE targets are $15/kWh and $0.09/kWh respectively. Sixteen pure oxide cycles were identified through thermodynamic calculations and literature information. Data showed the kinetics of re-oxidation of the various oxides to be a key barrier to implementing the proposed concept. A down selection was carried out based on operating temperature, materials costs and preliminary laboratory measurements. Cobalt oxide, manganese oxide and barium oxide were selected for developmental studies to improve their REDOX reaction kinetics. A novel approach utilizing mixed oxides to improve the REDOX kinetics of the selected oxides was proposed. It partially

  10. Power plant heating system integrating low temperature heat and absorption heat pumps%电厂低温热与吸收式热泵耦合供热系统研究

    Institute of Scientific and Technical Information of China (English)

    邱丽霞; 郝艳红

    2015-01-01

    On the basis of analysis on two kinds of waste heat utilization approaches,using the low-tempera-ture flue gas waste heat to heat the condensate water and feed water by installing heat exchangers in the tail flue duct,and improving the quality of steam turbine exhaust and circulating water to supply heat for users by adopting absorption heat pumps,a novel waste heat utilization system for thermal power plants was proposed.In this system,the flue gas after the air preheater is regarded as the heat pump's driving heat source,thus the absorption heat pump can recover the heat of condensation and heat the heating hot water. In addition,in order to meet the heating requirements in extremely cold periods,the heat exchanger is in-stalled after the economizer in the tail flue duct,in which the heating hot water from heat pump exit is heated by part of the flue gas extracted from outlet of the economizer.In this system,the low-temperature heat is recovered by the absorption heat pump,so that the exergy loss is reduced in the heat transfer process,the extraction steam from the steam turbine decreases and the output power increases.Further-more,combined with a 330 MW heat supply unit,this novel system's energy-saving effect was analyzed and the results were compared with that of the conventional flue gas waste heat utilization system (convention-al system I)and the conventional condensation heat heat pump system (conventional system2).The results show that,the annual standard coal consumption of the unit applying this novel system is 8 487.8 t less than that applying the conventional system I,and the output power is 1.3% to 2.7% higher than that ap-plying the conventional system II,which indicates the energy saving effect of this novel waste heat utiliza-tion system is remarkable.%基于常规烟气余热利用系统(常规系统1)及常规冷凝热热泵系统(常规系统2),提出了一种新型的电厂余热利用系统:将空气预热器(空预器)后的烟气作为

  11. Energy storage - underground pumped storage / energy membrane; Energilager - nedgravet pumpelager / energimembran

    Energy Technology Data Exchange (ETDEWEB)

    Schroeder Pedersen, A. (Technical Univ. of Denmark, Risoe National Lab. for Sustainable Energy, Roskilde (Denmark)); Hededal, O.; Foged, N. (Danmarks Tekniske Univ., DTU Byg. Institut for Byggeri og Anlaeg, Kgs. Lyngby (Denmark)) (and others)

    2010-06-15

    The project deals with a new idea where water from a nearby reservoir - sea, river or lake - via a pump/motor pressurizes a closed underground membrane, meaning that excessive electrical energy is stored as mechanical energy. Afterwards the stored energy is released by the obtained pressure and the amount of water will impel a turbine/generator. Hereby an underground pressurized pump storage can be established. The advantage by such type of pump storage is, that it can be placed, where there is no natural geological formations - high placed lake or alike. The conclusion and results after the completion of Phase 1 and 2 is that the expected losses in the soil layers where the energy is stored as potential energy will be approx. 100J/m{sub 3}. It is expected that the energy loss in the soil layer on a 50x50 m demo installation (performed in Phase 3) would constitute <0.5% of the total energy stored. An elongation of less the <2% of the LDPE membrane was measured in the experiments. This is a lot less than the 7% elongation that the membrane was exposed to during the testing at Danfoss, and further far below elongation of 500% that the supplier indicates. There were no changes on the membrane after the test. (Author)

  12. 压水堆核电站循环冷却水泵齿轮箱传动设计研究%Design of Circulating Pump Gear Box for Pressurized Water Reator Nuclear Power Plant

    Institute of Scientific and Technical Information of China (English)

    邢志伟

    2011-01-01

    The development of nuclear power is our inevitable choice for sustainable economic development, but also is it a very arduous and difficult task. Based on pressurized water reactor nuclear power plant, the basic characteristics, domestic difficulties and development of the circulating pump gear box are introduced. Then, the transmission scheme of the gear box is discussed, involving the determination of basic parameters, design of contained bodies, selection and heat treatment of major components and so on. Finally, the future of the gear box for nuclear power is prospected.%基于压水堆核电站,介绍了循环水泵用齿轮箱减速器的基本特点、国产化难点及国内发展概况.讨论了核电用齿轮箱的传动方案设计,涉及基本参数的确定、均载机构的设计、主要零件的选材与热处理等.最后展望核电用齿轮箱的发展前景.

  13. Testing thermocline filler materials and molten-salt heat transfer fluids for thermal energy storage systems used in parabolic trough solar power plants.

    Energy Technology Data Exchange (ETDEWEB)

    Kelly, Michael James; Hlava, Paul Frank; Brosseau, Douglas A.

    2004-07-01

    Parabolic trough power systems that utilize concentrated solar energy to generate electricity are a proven technology. Industry and laboratory research efforts are now focusing on integration of thermal energy storage as a viable means to enhance dispatchability of concentrated solar energy. One option to significantly reduce costs is to use thermocline storage systems, low-cost filler materials as the primary thermal storage medium, and molten nitrate salts as the direct heat transfer fluid. Prior thermocline evaluations and thermal cycling tests at the Sandia National Laboratories' National Solar Thermal Test Facility identified quartzite rock and silica sand as potential filler materials. An expanded series of isothermal and thermal cycling experiments were planned and implemented to extend those studies in order to demonstrate the durability of these filler materials in molten nitrate salts over a range of operating temperatures for extended timeframes. Upon test completion, careful analyses of filler material samples, as well as the molten salt, were conducted to assess long-term durability and degradation mechanisms in these test conditions. Analysis results demonstrate that the quartzite rock and silica sand appear able to withstand the molten salt environment quite well. No significant deterioration that would impact the performance or operability of a thermocline thermal energy storage system was evident. Therefore, additional studies of the thermocline concept can continue armed with confidence that appropriate filler materials have been identified for the intended application.

  14. Adaptation of thermal power plants

    NARCIS (Netherlands)

    Bogmans, Christian W.J.; Dijkema, Gerard P.J.; Vliet, van Michelle T.H.

    2017-01-01

    When does climate change information lead to adaptation? We analyze thermal power plant adaptation by means of investing in water-saving (cooling) technology to prevent a decrease in plant efficiency and load reduction. A comprehensive power plant investment model, forced with downscaled climate

  15. Adaptation of thermal power plants

    NARCIS (Netherlands)

    Bogmans, Christian W.J.; Dijkema, Gerard P.J.; Vliet, van Michelle T.H.

    2017-01-01

    When does climate change information lead to adaptation? We analyze thermal power plant adaptation by means of investing in water-saving (cooling) technology to prevent a decrease in plant efficiency and load reduction. A comprehensive power plant investment model, forced with downscaled climate

  16. Power Plant Replacement Study

    Energy Technology Data Exchange (ETDEWEB)

    Reed, Gary

    2010-09-30

    This report represents the final report for the Eastern Illinois University power plant replacement study. It contains all related documentation from consideration of possible solutions to the final recommended option. Included are the economic justifications associated with the chosen solution along with application for environmental permitting for the selected project for construction. This final report will summarize the results of execution of an EPC (energy performance contract) investment grade audit (IGA) which lead to an energy services agreement (ESA). The project includes scope of work to design and install energy conservation measures which are guaranteed by the contractor to be self‐funding over its twenty year contract duration. The cost recovery is derived from systems performance improvements leading to energy savings. The prime focus of this EPC effort is to provide a replacement solution for Eastern Illinois University’s aging and failing circa 1925 central steam production plant. Twenty‐three ECMs were considered viable whose net impact will provide sufficient savings to successfully support the overall project objectives.

  17. Power Plant Replacement Study

    Energy Technology Data Exchange (ETDEWEB)

    Reed, Gary

    2010-09-30

    This report represents the final report for the Eastern Illinois University power plant replacement study. It contains all related documentation from consideration of possible solutions to the final recommended option. Included are the economic justifications associated with the chosen solution along with application for environmental permitting for the selected project for construction. This final report will summarize the results of execution of an EPC (energy performance contract) investment grade audit (IGA) which lead to an energy services agreement (ESA). The project includes scope of work to design and install energy conservation measures which are guaranteed by the contractor to be self-funding over its twenty year contract duration. The cost recovery is derived from systems performance improvements leading to energy savings. The prime focus of this EPC effort is to provide a replacement solution for Eastern Illinois University's aging and failing circa 1925 central steam production plant. Twenty-three ECMs were considered viable whose net impact will provide sufficient savings to successfully support the overall project objectives.

  18. Power Plant Replacement Study

    Energy Technology Data Exchange (ETDEWEB)

    Reed, Gary

    2010-09-30

    This report represents the final report for the Eastern Illinois University power plant replacement study. It contains all related documentation from consideration of possible solutions to the final recommended option. Included are the economic justifications associated with the chosen solution along with application for environmental permitting for the selected project for construction. This final report will summarize the results of execution of an EPC (energy performance contract) investment grade audit (IGA) which lead to an energy services agreement (ESA). The project includes scope of work to design and install energy conservation measures which are guaranteed by the contractor to be self-funding over its twenty year contract duration. The cost recovery is derived from systems performance improvements leading to energy savings. The prime focus of this EPC effort is to provide a replacement solution for Eastern Illinois University’s aging and failing circa 1925 central steam production plant. Twenty-three ECMs were considered viable whose net impact will provide sufficient savings to successfully support the overall project objectives.

  19. Power plant technology 2014. Strategies, systems engineering and operation; Kraftwerkstechnik 2014. Strategien, Anlagentechnik und Betrieb

    Energy Technology Data Exchange (ETDEWEB)

    Beckmann, Michael; Hurtado, Antonio

    2014-07-01

    The book on power plant technology 2014 (strategies, systems engineering and operation) covers the following issues: Climate, politics and economy; wind power; fossil-fuel power plants, flexible power plants - plant operation, flexible power plants- materials, materials for energy technology, fuel feed and incineration, modeling of the water-vapor-circuit, corrosion, deposits and cleaning, vapor turbines, GUD power plants, fluidized bed combustion, energetic biomass use, combined heat and power generation and decentralized units, storage facilities, emissions - mitigation and measuring techniques.

  20. Understanding Biomass Ignition in Power Plant Mills

    DEFF Research Database (Denmark)

    Schwarzer, Lars; Jensen, Peter Arendt; Glarborg, Peter

    2017-01-01

    Converting existing coal fired power plants to biomass is a readily implemented strategy to increase the share of renewable energy. However, changing from one fuel to another is not straightforward: Experience shows that wood pellets ignite more readily than coal in power plant mills or storages....... This is not very well explained by apply-ing conventional thermal ignition theory. An experimental study at lab scale, using pinewood as an example fuel, was conducted to examine self-heating and self-ignition. Supplemental experiments were performed with bituminous coal. Instead of characterizing ignition...

  1. System curves for 100-K water plant expansion pump analysis

    Energy Technology Data Exchange (ETDEWEB)

    Rudock, E.R.

    1958-06-05

    Modifications to the 100-K water plant will be made, under Project CG-775, to increase total process water flow rates to 175,000 gpm or greater. Included in the modifications will be the installation of new pump impellers for the primary and secondary process water pumps located in the 190-K Buildings.

  2. THERMOCHEMICAL HEAT STORAGE FOR CONCENTRATED SOLAR POWER

    Energy Technology Data Exchange (ETDEWEB)

    PROJECT STAFF

    2011-10-31

    Thermal energy storage (TES) is an integral part of a concentrated solar power (CSP) system. It enables plant operators to generate electricity beyond on sun hours and supply power to the grid to meet peak demand. Current CSP sensible heat storage systems employ molten salts as both the heat transfer fluid and the heat storage media. These systems have an upper operating temperature limit of around 400 C. Future TES systems are expected to operate at temperatures between 600 C to 1000 C for higher thermal efficiencies which should result in lower electricity cost. To meet future operating temperature and electricity cost requirements, a TES concept utilizing thermochemical cycles (TCs) based on multivalent solid oxides was proposed. The system employs a pair of reduction and oxidation (REDOX) reactions to store and release heat. In the storage step, hot air from the solar receiver is used to reduce the oxidation state of an oxide cation, e.g. Fe3+ to Fe2+. Heat energy is thus stored as chemical bonds and the oxide is charged. To discharge the stored energy, the reduced oxide is re-oxidized in air and heat is released. Air is used as both the heat transfer fluid and reactant and no storage of fluid is needed. This project investigated the engineering and economic feasibility of this proposed TES concept. The DOE storage cost and LCOE targets are $15/kWh and $0.09/kWh respectively. Sixteen pure oxide cycles were identified through thermodynamic calculations and literature information. Data showed the kinetics of re-oxidation of the various oxides to be a key barrier to implementing the proposed concept. A down selection was carried out based on operating temperature, materials costs and preliminary laboratory measurements. Cobalt oxide, manganese oxide and barium oxide were selected for developmental studies to improve their REDOX reaction kinetics. A novel approach utilizing mixed oxides to improve the REDOX kinetics of the selected oxides was proposed. It partially

  3. Design & development fo a 20-MW flywheel-based frequency regulation power plant : a study for the DOE Energy Storage Systems program.

    Energy Technology Data Exchange (ETDEWEB)

    Rounds, Robert (Beacon Power, Tyngsboro, MA); Peek, Georgianne Huff

    2009-01-01

    This report describes the successful efforts of Beacon Power to design and develop a 20-MW frequency regulation power plant based solely on flywheels. Beacon's Smart Matrix (Flywheel) Systems regulation power plant, unlike coal or natural gas generators, will not burn fossil fuel or directly produce particulates or other air emissions and will have the ability to ramp up or down in a matter of seconds. The report describes how data from the scaled Beacon system, deployed in California and New York, proved that the flywheel-based systems provided faster responding regulation services in terms of cost-performance and environmental impact. Included in the report is a description of Beacon's design package for a generic, multi-MW flywheel-based regulation power plant that allows accurate bids from a design/build contractor and Beacon's recommendations for site requirements that would ensure the fastest possible construction. The paper concludes with a statement about Beacon's plans for a lower cost, modular-style substation based on the 20-MW design.

  4. Liquid-metal pumps for large-scale breeder-reactor plant (prototype pump)

    Energy Technology Data Exchange (ETDEWEB)

    Lindsay, M. (comp.)

    1976-07-01

    This report presents the recommended pump design for use in Large Scale Liquid Metal Fast Breeder Reactor plants. The base design for the pump will circulate 127,000 GPM of liquid sodium at temperatures up to 850/sup 0/F and with a total discharge head at the design point of 500 feet Na with an impeller that is 40 feet below the sodium seal. The pump design is predicated on developing an impeller design which will have a suction specific speed (S/sub n/) of about 20,000 with 20 feet NPSH available, which will result in a pump speed of 530 RPM at design conditions. The design is based on the technology developed in the design and fabrication of FFTF pumps, the design efforts for the Clinch River Breeder Reactor Pump design study and other technology.

  5. Simulation of hybrid solar power plants

    Science.gov (United States)

    Dieckmann, Simon; Dersch, Jürgen

    2017-06-01

    Hybrid solar power plants have the potential to combine advantages of two different technologies at the cost of increased complexity. The present paper shows the potential of the software greenius for the techno-economic evaluation of hybrid solar power plants and discusses two exemplary scenarios. Depreciated Concentrated Solar Power (CSP) plants based on trough technology can be retrofitted with solar towers in order to reach higher steam cycle temperatures and hence efficiencies. Compared to a newly built tower plant the hybridization of a depreciated trough plant causes about 30% lower LCOE reaching 104 /MWh. The second hybrid scenario combines cost-efficient photovoltaics with dispatchable CSP technology. This hybrid plant offers very high capacity factors up to 69% based on 100% load from 8am to 11pm. The LCOE of the hybrid plant are only slightly lower (174 vs. 186 /MWh) compared to the pure CSP plant because the capital expenditure for thermal storage and power block remains the same while the electricity output is much lower.

  6. 75 FR 78984 - South Run Pumped Storage, LLC; Notice of Preliminary Permit Application Accepted for Filing and...

    Science.gov (United States)

    2010-12-17

    ... Energy Regulatory Commission South Run Pumped Storage, LLC; Notice of Preliminary Permit Application..., 2010. On October 26, 2010, South Run Pumped Storage, LLC, Massachusetts, filed an application for a... feasibility of the South Run Pumped Storage Project (South Run Project or project) to be located on South...

  7. 76 FR 28025 - East Maui Pumped Storage Water Supply LCC; Notice of Preliminary Permit Application Accepted for...

    Science.gov (United States)

    2011-05-13

    ... Energy Regulatory Commission Project No. 14142-000 East Maui Pumped Storage Water Supply LCC; Notice of... Competing Applications On April 1, 2011, East Maui Pumped Storage Water Supply LCC filed an application for... the feasibility of the East Maui Pumped Storage Water Supply Project to be located on the Miliko...

  8. Impact of mechanical- and maintenance-induced failures of main reactor coolant pump seals on plant safety

    Energy Technology Data Exchange (ETDEWEB)

    Azarm, M A; Boccio, J L; Mitra, S

    1985-12-01

    This document presents an investigation of the safety impact resulting from mechanical- and maintenance-induced reactor coolant pump (RCP) seal failures in nuclear power plants. A data survey of the pump seal failures for existing nuclear power plants in the US from several available sources was performed. The annual frequency of pump seal failures in a nuclear power plant was estimated based on the concept of hazard rate and dependency evaluation. The conditional probability of various sizes of leak rates given seal failures was then evaluated. The safety impact of RCP seal failures, in terms of contribution to plant core-melt frequency, was also evaluated for three nuclear power plants. For leak rates below the normal makeup capacity and the impact of plant safety were discussed qualitatively, whereas for leak rates beyond the normal make up capacity, formal PRA methodologies were applied. 22 refs., 17 figs., 19 tabs.

  9. Ferritins and iron storage in plants.

    Science.gov (United States)

    Briat, Jean-François; Duc, Céline; Ravet, Karl; Gaymard, Frédéric

    2010-08-01

    Iron is essential for both plant productivity and nutritional quality. Improving plant iron content was attempted through genetic engineering of plants overexpressing ferritins. However, both the roles of these proteins in the plant physiology, and the mechanisms involved in the regulation of their expression are largely unknown. Although the structure of ferritins is highly conserved between plants and animals, their cellular localization differ. Furthermore, regulation of ferritin gene expression in response to iron excess occurs at the transcriptional level in plants, in contrast to animals which regulate ferritin expression at the translational level. In this review, our knowledge of the specific features of plant ferritins is presented, at the level of their (i) structure/function relationships, (ii) cellular localization, and (iii) synthesis regulation during development and in response to various environmental cues. A special emphasis is given to their function in plant physiology, in particular concerning their respective roles in iron storage and in protection against oxidative stress. Indeed, the use of reverse genetics in Arabidopsis recently enabled to produce various knock-out ferritin mutants, revealing strong links between these proteins and protection against oxidative stress. In contrast, their putative iron storage function to furnish iron during various development processes is unlikely to be essential. Ferritins, by buffering iron, exert a fine tuning of the quantity of metal required for metabolic purposes, and help plants to cope with adverse situations, the deleterious effects of which would be amplified if no system had evolved to take care of free reactive iron.

  10. Preliminary design study of underground pumped hydro and compressed-air energy storage in hard rock. Volume 8: Design approaches - UPH. Appendix B: Shafts

    Science.gov (United States)

    1981-04-01

    An assessment of shaft requirements for an underground pumped hydroelectric (UPH) facility is documented. Shaft requirements for both the construction and the permanent operation phases of the facility are outlined. Possible shaft arrangements are developed and the design of shaft linings is discussed. Methods of shaft sinking are reviewed. Alternative schedules for the sinking of the shafts are described and a preferred schedule selected. The material presented and also the cost estimates are based on the requirements for a 2000 MW plant providing 20,000 MWh of storage with a nominal head of 4600 ft. Studies subsequently carried out, including power plant design, head optimization analyses for the overall UPH surface and underground configuration, and further refinement of selected designs, have modified some of the material given.

  11. Potential Coastal Pumped Hydroelectric Energy Storage Locations Identified using GIS-based Topographic Analysis

    Science.gov (United States)

    Parsons, R.; Barnhart, C. J.; Benson, S. M.

    2013-12-01

    Large-scale electrical energy storage could accommodate variable, weather dependent energy resources such as wind and solar. Pumped hydroelectric energy storage (PHS) and compressed energy storage area (CAES) have life cycle energy and financial costs that are an order of magnitude lower than conventional electrochemical storage technologies. However PHS and CAES storage technologies require specific geologic conditions. Conventional PHS requires an upper and lower reservoir separated by at least 100 m of head, but no more than 10 km in horizontal distance. Conventional PHS also impacts fresh water supplies, riparian ecosystems, and hydrologic environments. A PHS facility that uses the ocean as the lower reservoir benefits from a smaller footprint, minimal freshwater impact, and the potential to be located near off shore wind resources and population centers. Although technologically nascent, today one coastal PHS facility exists. The storage potential for coastal PHS is unknown. Can coastal PHS play a significant role in augmenting future power grids with a high faction of renewable energy supply? In this study we employ GIS-based topographic analysis to quantify the coastal PHS potential of several geographic locations, including California, Chile and Peru. We developed automated techniques that seek local topographic minima in 90 m spatial resolution shuttle radar topography mission (SRTM) digital elevation models (DEM) that satisfy the following criteria conducive to PHS: within 10 km from the sea; minimum elevation 150 m; maximum elevation 1000 m. Preliminary results suggest the global potential for coastal PHS could be very significant. For example, in northern Chile we have identified over 60 locations that satisfy the above criteria. Two of these locations could store over 10 million cubic meters of water or several GWh of energy. We plan to report a global database of candidate coastal PHS locations and to estimate their energy storage capacity.

  12. A concept of an electricity storage system with 50 MWh storage capacity

    Directory of Open Access Journals (Sweden)

    Józef Paska

    2012-06-01

    Full Text Available Electricity storage devices can be divided into indirect storage technology devices (involving electricity conversion into another form of energy, and direct storage (in an electric or magnetic fi eld. Electricity storage technologies include: pumped-storage power plants, BES Battery Energy Storage, CAES Compressed Air Energy Storage, Supercapacitors, FES Flywheel Energy Storage, SMES Superconducting Magnetic Energy Storage, FC Fuel Cells reverse or operated in systems with electrolysers and hydrogen storage. These technologies have diff erent technical characteristics and economic parameters that determine their usability. This paper presents two concepts of an electricity storage tank with a storage capacity of at least 50 MWh, using the BES battery energy storage and CAES compressed air energy storage technologies.

  13. New fuel cell plants and power sources for submarines

    Energy Technology Data Exchange (ETDEWEB)

    Nikiforov, B.; Sokolov, V. [CDB ME ' ' Rubin' ' (Russian Federation)

    2000-07-01

    The existing storage batteries for submarines have been analyzed, the quality of their design has been estimated and a power plant with electrochemical generators (fuel cells) has been suggested as an electric energy source. The history and the status of power plant design in Russia have been reflected. (authors)

  14. Water cooling thermal power measurement in a vacuum diffusion pump

    Directory of Open Access Journals (Sweden)

    Luís Henrique Cardozo Amorin

    2012-04-01

    Full Text Available Diffusion vacuum pumps are used both in industry and in laboratory science for high vacuum production. For its operation they must be refrigerated, and it is done by circulating water in open circuit. Considering that, vacuum systems stays operating by hours, the water consumption may be avoided if the diffusion vacuum pumps refrigeration were done in closed circuit. However, it is necessary to know the diffusion vacuum pump thermal power (the heat transferred to circulate water by time units to implement one of these and get in the refrigeration system dimension. In this paper the diffusion vacuum pump thermal power was obtained by measuring water flow and temperature variation and was calculated through the heat quantity variation equation time function. The thermal power value was 935,6 W, that is 397 W smaller and 35 W bigger than, respectively, the maximum and minimum diffusion pump thermal power suggested by its operation manual. This procedure have been shown useful to precisely determine the diffusion pump thermal power or of any other system that needs to be refrigerated in water closed circuit.

  15. 储能参与风电场惯性响应的容量配置方法%Capacity Configuration Method for Wind Power Plant Inertia Response Considering Energy Storage

    Institute of Scientific and Technical Information of China (English)

    苗福丰; 唐西胜; 齐智平

    2015-01-01

    With the high penetration level of wind power,technical requirements of wind plant inertia response have been put forward by power system.The control of wind turbine rotor can provide certain energy instantaneously for system inertia. However,it is not effective for all working conditions,such as low wind speed or high wind speed.In order to solve this problem,a solution to fulfil the performance of wind power plant inertia response is presented,which combines the control of wind turbines and energy storage.Furthermore,the demand of energy storage capacity with different wind speeds is analyzed, and the method based on non-parametric kernel density estimation is proposed to determine the storage allocation capacity with different confidence levels,which effectively avoid the disadvantages of the traditional parameter estimation method that depends on the distribution characteristics of wind speed.In the end,analysis of calculation examples proves the effectiveness of the proposed method in reducing the storage capacity as well as improving the economic efficiency of energy storage on participating in wind power plant inertia response.%在当前风电高渗透率的背景下,电力系统对风电场的惯性响应能力提出了相应的技术要求。风电机组通过转子惯性控制可以提供一定的支撑,但受转子转速限制,风电机组难以在全风况下满足惯性响应需求。针对该问题,文中提出储能参与风电场惯性响应,将风电机组的转子惯性控制和储能控制相结合,使风电场具备类似于传统电源的惯性响应能力,并分析了不同风况下的储能容量需求,提出了基于非参数核密度估计的储能容量配置方法,摆脱了传统参数估计法对风速分布特性的依赖。算例分析表明,所提方法可有效降低储能配置容量,提高储能参与风电场惯性响应的技术经济性。

  16. Optimization of maintenance scheduling with genetic algorithms regarding the storage behavior during the availability prognosis of power plants; Optimierung der Instandhaltungsplanung mit genetischen Algorithmen unter Beruecksichtigung des Speicherverhaltens bei der Verfuegbarkeitsprognose von Kraftwerksanlagen

    Energy Technology Data Exchange (ETDEWEB)

    Warnecke, Martin

    2008-12-19

    In the age of the liberalized energy market the power plant raisers and operators have to consider several factors when choosing the fuel type and dimensioning their power plants, e.g. emissions, erection cost and last but not least operating cost. Simulations assuming different scenarios are required. The rivaling aspects of erection cost, partially dependant availability, maintenance philosophy and operating cost are motivating the optimization of maintenance scheduling and the availability prognosis which are the topic of this thesis. The focus of this thesis is on the scheduling of the time based maintenance strategy. This strategy defines the time spans between the repeating inspections of each component. This is based on the experience of operators and manufacturers. The mathematic problem itself is especially challenging because of strong interdependencies between the single components due to synergy effects. Each component has its own theoretically optimal lifetime and maintenance period. Yet as part of a compound it might be more cost efficient in the long run to maintain some components together shifting some of them forward or backward. The thereby caused interdependencies constitute a non-linear, mixed-whole-numbered calculation of the cost approximation. For the optimization of this maintenance scheduling a new approach was developed. It was realized that the problem couldn't be solved satisfyingly with classic optimization algorithms. Afterwards a solution based on ''genetic algorithms'' was developed. In the meantime the methods for the availability prognosis of complex power plant facilities were enhanced. Especially a new component with storage behavior (with optional losses) was added to the prognosis tool. This storage model integrates the behavior of a storage into the computing time reduced Monte-Carlo-Method. (orig.)

  17. Power Ramp Limitation capabilities of Large PV Power Plants with Active Power Reserves

    DEFF Research Database (Denmark)

    Bogdan, Craciun; Kerekes, Tamas; Sera, Dezso

    2017-01-01

    Power Ramp Limitation (PRL) is likely to become a requirement for large scale photovoltaic power plants (LPVPPs) in order to allow the increase of PV penetration levels. Especially in islands with reduced inertia capability, this problem is more stringent: high power ramp can be caused by either...... fast irradiance changes or other participant generators for example wind power, or loads. In order to compensate for the power mismatch, LPVPPs must use Active Power Reserve (APR), by either curtailment or auxiliary storage. The paper proposes a PRL control structure for dynamic APR sizing...... area of LPVPPs acts as filter against fast irradiance changes, the study reveals also the required plant size for which auxiliary storage is no longer needed in order to comply with PRL requirements – an important economical aspect....

  18. Energy Optimization for Transcritical CO2 Heat Pump for Combined Heating and Cooling and Thermal Storage Applications

    DEFF Research Database (Denmark)

    Do Carmo, Carolina Madeira Ramos; Blarke, Morten; Yazawa, Kazuaki

    2012-01-01

    A transcritical heat pump (THP) cycle using carbon dioxide (CO2) as the refrigerant is known to feature an excellent coefficient of performance (COP) as a thermodynamic system. Using this feature, we are designing and building a system that combines a water-to-water CO2 heat pump with both hot...... and cold thermal storages know as Thermal Battery (TB) (Blarke, 2012). Smart and effective use of intermittent renewable energy resources (for example solar and wind power) is obtained supplying water heating (>70 oC) and cooling services (

  19. AND THERMAL POWER PLANTS

    Directory of Open Access Journals (Sweden)

    Alduhov Oleg Aleksandrovich

    2012-10-01

    Full Text Available Investigation of the atmospheric dispersion as part of the process of selection of sites to accommodate nuclear and thermal power plants is performed to identify concentration fields of emissions and to assess the anthropogenic impact produced on the landscape components and human beings. Scattering properties of the atmospheric boundary layer are mainly determined by the turbulence intensity and the wind field. In its turn, the turbulence intensity is associated with the thermal stratification of the boundary layer. Therefore, research of the atmospheric dispersion is reduced to the study of temperature and wind patterns of the boundary layer. Statistical processing and analysis of the upper-air data involves the input of the data collected by upper-air stations. Until recently, the upper-air data covering the standard period between 1961 and 1970 were applied for these purposes, although these data cannot assure sufficient reliability of assessments in terms of the properties of the atmospheric dispersion. However, recent scientific and technological developments make it possible to substantially increase the data coverage by adding the upper-air data collected within the period between 1964 and 2010. The article has a brief overview of BL_PROGS, a specialized software package designated for the processing of the above data. The software package analyzes the principal properties of the atmospheric dispersion. The use of the proposed software package requires preliminary development of a database that has the information collected by an upper-air station. The software package is noteworthy for the absence of any substantial limitations imposed onto the amount of the input data that may go up in proportion to the amount of the upper-air data collected by upper-air stations.

  20. Simulating solar power plant variability :

    Energy Technology Data Exchange (ETDEWEB)

    Lave, Matthew Samuel; Ellis, Abraham; Stein, Joshua.

    2013-06-01

    It is important to be able to accurately simulate the variability of solar PV power plants for grid integration studies. We aim to inform integration studies of the ease of implementation and application-specific accuracy of current PV power plant output simulation methods. This report reviews methods for producing simulated high-resolution (sub-hour or even sub-minute) PV power plant output profiles for variability studies and describes their implementation. Two steps are involved in the simulations: estimation of average irradiance over the footprint of a PV plant and conversion of average irradiance to plant power output. Six models are described for simulating plant-average irradiance based on inputs of ground-measured irradiance, satellite-derived irradiance, or proxy plant measurements. The steps for converting plant-average irradiance to plant power output are detailed to understand the contributions to plant variability. A forthcoming report will quantify the accuracy of each method using application-specific validation metrics.

  1. Multifunctional Heat Pump Installation for Dairy Plants

    Directory of Open Access Journals (Sweden)

    Sit M.L.

    2015-08-01

    Full Text Available The article presents the installation based on the approach using the integration of the carbon dioxide heat pump in pasteurization and cooling installation for milk and in installations for preparing of hot and "icy" water. The scheme differs from the prototype by the use of additional heat exchangers and of their connection to the main elements of the installation. A proposed technique of elements connection in the heat pump installation permits to compensate the effect of temperature of cold water supply source, which is low-grade heat source for the heat pump, on the quality the work of the installation. The design of the installation enables to compensate the impact of seasonal variation of water temperature. The installation ensures the COP = 5.3.

  2. A Review of Hazardous Chemical Species Associated with CO2 Capturefrom Coal-Fired Power Plants and Their Potential Fate in CO2 GeologicStorage

    Energy Technology Data Exchange (ETDEWEB)

    Apps, J.A.

    2006-02-23

    Conventional coal-burning power plants are major contributors of excess CO2 to the atmospheric inventory. Because such plants are stationary, they are particularly amenable to CO2 capture and disposal by deep injection into confined geologic formations. However, the energy penalty for CO2 separation and compression is steep, and could lead to a 30-40 percent reduction in useable power output. Integrated gas combined cycle (IGCC) plants are thermodynamically more efficient, i.e.,produce less CO2 for a given power output, and are more suitable for CO2 capture. Therefore, if CO2 capture and deep subsurface disposal were to be considered seriously, the preferred approach would be to build replacement IGCC plants with integrated CO2 capture, rather than retrofit existing conventional plants. Coal contains minor quantities of sulfur and nitrogen compounds, which are of concern, as their release into the atmosphere leads to the formation of urban ozone and acid rain, the destruction of stratospheric ozone, and global warming. Coal also contains many trace elements that are potentially hazardous to human health and the environment. During CO2 separation and capture, these constituents could inadvertently contaminate the separated CO2 and be co-injected. The concentrations and speciation of the co-injected contaminants would differ markedly, depending on whether CO2 is captured during the operation of a conventional or an IGCC plant, and the specific nature of the plant design and CO2 separation technology. However, regardless of plant design or separation procedures, most of the hazardous constituents effectively partition into the solid waste residue. This would lead to an approximately two order of magnitude reduction in contaminant concentration compared with that present in the coal. Potential exceptions are Hg in conventional plants, and Hg and possibly Cd, Mo and Pb in IGCC plants. CO2 capture and injection disposal could afford an opportunity to deliberately capture

  3. Value of Concentrating Solar Power and Thermal Energy Storage

    Energy Technology Data Exchange (ETDEWEB)

    Sioshansi, R.; Denholm, P.

    2010-02-01

    This paper examines the value of concentrating solar power (CSP) and thermal energy storage (TES) in four regions in the southwestern United States. Our analysis shows that TES can increase the value of CSP by allowing more thermal energy from a CSP plant?s solar field to be used, by allowing a CSP plant to accommodate a larger solar field, and by allowing CSP generation to be shifted to hours with higher energy prices. We analyze the sensitivity of CSP value to a number of factors, including the optimization period, price and solar forecasting, ancillary service sales, capacity value and dry cooling of the CSP plant. We also discuss the value of CSP plants and TES net of capital costs.

  4. 78 FR 60273 - Granby Pumping Plant Switchyard-Windy Gap Substation Transmission Line Rebuild, Grand County...

    Science.gov (United States)

    2013-10-01

    ... Area Power Administration Granby Pumping Plant Switchyard-Windy Gap Substation Transmission Line... Substation (Project) transmission line in Grand County, Colorado. The transmission line is 13.6 miles long... Western's existing transmission line between the Windy Gap Substation and Stillwater Tap and provide a...

  5. 核电厂电动主给水泵调速系统研究及改进%Research and Improvement of the Speed Regulation System of Motor Driven Main Feed Water Pump in Nuclear Power Plant

    Institute of Scientific and Technical Information of China (English)

    张冲; 王旭峰

    2015-01-01

    对核电厂电动主给水泵( APA)的调速系统进行了研究,并针对手动调速模式下给水泵转速调节幅度过大的工程问题进行了研究及验证. 研究及验证采用理论研究结合现场试验的方式. 理论研究主要集中在手动调速和自动调速两个可编程逻辑控制器( PLC)程序,再经过现场的实际操作进行结果验证,最终及时解决了以上问题.%The research on speed regulation system of motor driven main feed water pump in nuclear power plant is conducted, and the engineering problem of excessive adjusting amplitude for the speed in manual operating mode is researched and validated. The way of research and validation is theoretical research combining with field tests;theoretic research is mainly focused on controlling the PLC programs for manual regulation and automatic regulation of the speed, and then the results are validated through practical operation on site, finally above problem is resolved promptly.

  6. Preliminary design study of underground pumped hydro and compressed-air energy storage in hard rock. Volume 4: System planning studies

    Science.gov (United States)

    1981-04-01

    Preliminary design and planning studies of water compensated compressed air energy storage (CAES) and underground pumped hydroelectric (UPH) power plants are presented. The costs of the CAES and UPH plant designs, and the results of economic evaluations performed for the PEPCO system are presented. The PEPCO system planning analysis was performed in parallel stages with plant design development. Analyses performed early in the project indicated a requirement for 1000 MW/10,000 MWH of energy storage on a daily operating schedule, with economic installation in two segments of 500 MW in 1990 and 1997. The analysis was updated eighteen months later near the end of the project to reflect the impact of new growth projections and revised plant costs. The revised results indicated economic installations for either UPH or CAES of approximately 675 MW/6750 MWH on a daily cycle, installed in blocks of approximately 225 MW in 1990, 1993 and 1995. Significant savings in revenue requirements and oil fuel over the combustion turbine alternative were identified for both CAES and UPH.

  7. Water pumps generate power efficiently; Wasserpumpen erzeugen wirtschaftlich Strom

    Energy Technology Data Exchange (ETDEWEB)

    Orchard, Bryan [KSB Aktiengesellschaft, Frankenthal (Germany)

    2010-09-15

    The water supply utility of Baden-Wuerttemberg and Bavaria (Zweckverband Landeswasserversorgung - ZV-LW) intended to construct another power generation stage in the Geislingen station. A longitudinally divided, single-stage spiral casing pump with a capacity of 600 kW was used as turbine; the investment cost and installation cost was only one fourth of the cost of a Francis turbine. Further, it is an advantage that the pump can also be used conventionally, i.e. in pump operation, to support drinking water transport. (orig.)

  8. Enzyme-Powered Pumps: From Fundamentals to Applications

    Science.gov (United States)

    Ortiz-Rivera, Isamar

    Non-mechanical nano and microfluidic devices that function without the aid of an external power source, and can be tailored to meet specific needs, represent the next generation of smart devices. Recently, we have shown that surface-bound enzymes can act as pumps driving large-scale fluid flows in the presence of any substance that triggers the enzymatic reaction (e.g. substrate, co-factor, or biomarker). The fluid velocities attained in such systems depend directly on the enzymatic reaction rate and the concentration of the substance that initiates enzymatic catalysis. The use of biochemical reactions to power a micropump offers the advantages of specificity, sensitivity, and selectively, eliminating at the same time the need of an external power source, while providing biocompatibility. More importantly, these self-powered pumps overcome a significant obstacle in nano- and micro-fluidics: the need to use external pressure-driven pumps to push fluids through devices. Certainly, the development of enzyme-powered devices opens up new venues in biochemical engineering, particularly in the biomedical field. The work highlighted in this dissertation covers all the studies performed with enzyme-powered pumps, from the development of the micropump design, to the efforts invested in understanding the enzyme pump concept as a whole. The data collected to date, aims to expand our knowledge about enzyme-powered micropumps from the inside out: not only by exploring the different applications of these devices at the macroscale, but also by investigating in depth the mechanism of pump activation behind these systems. Specifically, we have focused on: (1) The general features that characterize the pumping behavior observed in enzyme-powered pumps, as well as the optimization of the device, (2) the possible mechanisms behind fluid motion, including the role of enzyme coverage and/or activity on the transduction of chemical energy into mechanical fluid flow in these devices

  9. Temporary storage in dry of the spent nuclear fuel in the Nuclear Power Plant of Laguna Verde; Almacenamiento temporal en seco del combustible nuclear gastado en la Central Nuclear Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez M, N.; Vargas A, A., E-mail: natividad.hernandez@cfe.gob.mx [Comision Federal de Electricidad, Gerencia de Centrales Nucleoelectricas, Carretera Veracruz-Medellin Km. 7.5, 94270 Dos Bocas, Veracruz (Mexico)

    2013-10-15

    To guarantee the continuity in the operation of the two nuclear reactors of the nuclear power plant of Laguna Verde (NPP-L V) is an activity of high priority of the Comision Federal de Electricidad (CFE) in Mexico. At the present time, the CFE is working in the storage project in dry of the spent fuel with the purpose of to liberate space of the pools and to have the enlarged capacity of storage of the spent fuel that is discharged of the reactors. This work presents the storage option in dry of the spent fuel, considering that the original capacity of the spent fuel pools of the NPP-L V was of 1242 spaces each one and that in 1991, through a modification of the original design, the storage capacity was increased to 3177 spaces by pool. At present, the cells occupied by unit are of 2165 (68%) for the Unit-I and 1839 (58%) for the Unit-2, however, in 2017 and 2022 the capacity to discharge the complete core will be limited by what is required of a retirement option of spent fuel assemblies to liberate spaces. (author)

  10. Asbury power plant, Asbury, Missouri

    Energy Technology Data Exchange (ETDEWEB)

    Wicker, K.

    2005-08-01

    The Asbury power plant in rural southwest Missouri is off the beaten path in more ways than one. Three years ago, Empire District Electric Co., the plant's owner/operator, began mixing pieces of discarded tires into its coal fuel supply. Each ensuing year, without compromising local air quality, the plant has rid the area of millions of tires that otherwise would have ended up in a landfill. For demonstrating that a blight can be made right, Asbury is one of Power's 2005 top plants. 2 figs., 1 tab.

  11. Short Term Energy Storage for Grid Support in Wind Power Applications

    DEFF Research Database (Denmark)

    Stroe, Daniel Ioan; Stan, Ana-Irina; Diosi, Robert

    2012-01-01

    to increase the power system stability and the energy quality, is to integrate energy storage devices into wind power plants. This paper gives an overview of the state-of-the-art short-term energy storage devices and presents several applications which can be provided by the energy storage device - wind power......The penetration of wind power into the power system has been increasing in the recent years. Therefore, a lot of concerns related to the reliable operation of the power system have been addressed. An attractive solution to minimize the limitations faced by the wind power grid integration, and thus...... plant combined system. Moreover, two methods for estimating the remaining useful lifetime of the energy storage devices are presented....

  12. Pumps used as turbines power recovery, energy efficiency, CFD analysis

    Directory of Open Access Journals (Sweden)

    Bogdanović-Jovanović Jasmina B.

    2014-01-01

    Full Text Available As the global demand for energy grows, numerous studies in the field of energy efficiency are stimulated, and one of them is certainly the use of pumps in turbine operating mode. In order to reduce time necessary to determine pump characteristic in turbine operating mode problem was studied by computational fluid dynamics approach. The paper describes various problems faced during modeling (pump and turbine mode and the approaches used to resolve the problems. Since in the majority of applications, the turbine is a pump running in reverse, many attempts have been made to predict the turbine performance from the known pump performance, but only for best efficiency point. This approach does not provide reliable data for the design of the system with maximum energy efficiency and does not allow the determination of the head for a wide range of flow rates. This paper presents an example of centrifugal norm pump operating in both (pump and turbine regime and comparison of experimentally obtained results and computational fluid dynamics simulations. [Projekat Ministarstva nauke Republike Srbije, br. TR33040: Revitalization of existing and designing new micro and mini hydropower plants (from 100 to 1000 kW in the territory of South and Southeast Serbia

  13. Nuclear Power Plant Simulation Game.

    Science.gov (United States)

    Weiss, Fran

    1979-01-01

    Presents a nuclear power plant simulation game which is designed to involve a class of 30 junior or senior high school students. Scientific, ecological, and social issues covered in the game are also presented. (HM)

  14. Power Plant Water Intake Assessment.

    Science.gov (United States)

    Zeitoun, Ibrahim H.; And Others

    1980-01-01

    In order to adequately assess the impact of power plant cooling water intake on an aquatic ecosystem, total ecosystem effects must be considered, rather than merely numbers of impinged or entrained organisms. (Author/RE)

  15. International Conference on Underground Pumped Hydro and Compressed Air Energy Storage, San Francisco, CA, September 20-22, 1982, Collection of Technical Papers

    Science.gov (United States)

    1982-08-01

    Topics discussed include an assessment of the market potential of compressed air energy storage (CAES) systems, turbocompressor considerations in CAES plants, subsurface geological considerations in siting an underground pumped hydro (UPH) project, and the preliminary assessment of waste heat recovery system for CAES plants. Also considered are CAES caverns design for leakage, simulation of the champagne effect in CAES plants, design of wells and piping for an aquifer CAES plant, various aspects of the Huntor CAES facility, low-pressure CAES, subsurface instrumentation plan for the Pittsfield CAES field test facility, and the feasibility of UPH storage in the Netherlands.

  16. 76 FR 77963 - Oglethorpe Power Corporation; Proposed Biomass Power Plant

    Science.gov (United States)

    2011-12-15

    ...; ] DEPARTMENT OF AGRICULTURE Rural Utilities Service Oglethorpe Power Corporation; Proposed Biomass Power Plant... (Oglethorpe) for the construction of a 100 megawatt (MW) biomass plant and related facilities (Proposal)...

  17. PV power plants

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2012-07-01

    Within the international seminar of the Ostbayerisches Technologie-Transfer-Institut e.V. (OTTI) at 11th June, 2012 in Munich (Federal Republic of Germany), the following lectures were held: (1) Technical due diligence (Dietmar Obst); (2) Certification / rating system for large PV plants (Robert Pfatischer); (3) O and M requirements (Lars Rulf); (4) IR photography for large scale systems (Bernhard Weinreich); (5) New market models for PV systems - direct marketing and sales of PV electricity (Martin Schneider); (6) Needs and benefits for plant certification for grid connection and operation (Christoph Luetke-Lengerich); (7) Lare volume module testing / Screening in the field and workshop (Semir Merzoug); (8) Dismantling costs of large scale PV plants (Siegfried Schimpf).

  18. 广州蓄能水电厂B厂机组导叶轴套密封漏水故障分析与处理%Analysis and Solution about the Gate Stem Seal Leakage Fault of Guangzhou Pumped Storage Power Station B Unit

    Institute of Scientific and Technical Information of China (English)

    袁丰江

    2011-01-01

    With the unit in Guangzhou Pumped Storage Power Station B as an example,the water guide vane bushings and gate stem seal structure were introduced, the guide vane bushings seal leakage failures were analyzed to find the specific cause of the fault, and appropriate solution and preventive measures were implemented.%以广州蓄能水电厂B厂机组为例,介绍导水机构中导叶轴套及轴套密封的结构构成,对导叶轴套密封漏水故障进行分析,找到了故障的具体原因,并实施了相应的处理和预防措施.

  19. Operate a Nuclear Power Plant.

    Science.gov (United States)

    Frimpter, Bonnie J.; And Others

    1983-01-01

    Describes classroom use of a computer program originally published in Creative Computing magazine. "The Nuclear Power Plant" (runs on Apple II with 48K memory) simulates the operating of a nuclear generating station, requiring students to make decisions as they assume the task of managing the plant. (JN)

  20. Potential for a Danish power system using wind energy generators, solar cells and storage

    Science.gov (United States)

    Blegaa, S.; Christiansen, G.

    1981-10-01

    Performance characteristics of a combined solar/wind power system equipped with storage and an unspecified back-up power source are studied on the basis of meteorological data in Denmark from 1959-1972. A model for annual production and storage from wind/solar installations is presented, assuming 12% efficiency for the solar cells and various power coefficients of the windmills, in addition to long and short-term storage. Noting that no correlation between wind and solar energy availability was found, and a constant ratio of 60% wind/40% solar was determined to be the optimum mix for large scale power production without taking into consideration the variations among years. It is concluded that 80-90% of the total Danish electrical load can be covered by solar/wind systems, and 100% may be possible with the addition of pumped hydroelectric storage.

  1. Self-Powered Magnetothermal Fluid Pump Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Advances in the capabilities of electronics have enabled high power density devices. However, even in light of advances in electronics efficiency figures, the...

  2. Solar Pilot Plant, Phase I. Preliminary design report. Volume V. Thermal storage subsystem. CDRL item 2

    Energy Technology Data Exchange (ETDEWEB)

    None

    1977-05-01

    Design, specifications, and diagrams for the thermal storage subsystem for the 10-MW pilot tower focus power plant are presented in detail. The Honeywell thermal storage subsystem design features a sensible heat storage arrangement using proven equipment and materials. The subsystem consists of a main storage containing oil and rock, two buried superheater tanks containing inorganic salts (Hitec), and the necessary piping, instrumentation, controls, and safety devices. The subsystem can provide 7 MW(e) for three hours after twenty hours of hold. It can be charged in approximately four hours. Storage for the commercial-scale plant consists of the same elements appropriately scaled up. Performance analysis and tradeoff studies are included.

  3. Expertise on the Goesgen-Daeniken nuclear power plant on the granting of a licence for the construction and operation of a water storage pool for fuel assemblies at the site of the power plant; Gutachten zum Gesuch der Kernkraftwerk Goesgen-Daeniken AG um Erteilung der Bewilligung fuer den Bau und Betrieb eines Brennelement-Nasslagers auf dem Areal des Kernkraftwerks

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2003-04-15

    On June 26, 2002, the Goesgen-Daeniken AG nuclear power plant (KKG) delivered a request to the Swiss Federal Council for the granting of a licence for the construction and operation of a water storage pool for the on-site storage of the power plant's fuel assemblies. The present report contains the results of the examination of the request by the Federal Agency for the Safety of Nuclear Installations (HSK), to check that the projected storage pool satisfies the legal requirements from the point of view of nuclear safety and protection against radioactivity. A water storage pool already exists in the reactor building of KKG. It was conceived for a fuel cycle based on the reprocessing of the spent fuel assemblies. Its capacity is not sufficient when the spent fuel assemblies are no longer reprocessed but have to be transferred and stored in the Central Intermediate Storage Facility (ZWILAG) in Wuerenlingen because their heat production is too high. The capacity of the actual water pool allows a maximum cooling time of 5-6 years, while 7-10 years are required before transfer to ZWILAG. The projected new water storage pool has to be aircraft crash and earthquake proof, in the same way that the reactor building itself has to be. It can store a maximum of 1008 fuel assemblies. The water in the pool as well as the pool walls shield the radiation from of the fuel assemblies almost completely. Each fuel assembly is put into a square steel channel. The channel walls are lined with 6.11 mg/cm{sup 2} of the neutron absorbing nuclide B-10, which guaranties the subcriticality of the water pool even if the storage pool would be entirely filled with non-irradiated fuel assemblies with the maximal allowed enrichment or the maximal allowed content of Plutonium in case of MOX fuel assemblies, which is a very conservative assumption. The heat released by decay in the spent fuel assemblies is transferred to the pool water. Storage pool cooling is carried out by natural circulation

  4. Introducing a computer program devoted to renewable integration assessment of multi-field solar photovoltaic power plants

    Energy Technology Data Exchange (ETDEWEB)

    Gil, M.A.C.; Arroba, J.P.; Ibanez, J.C.; Criado, J.A.R. [Ciudad Univ., Madrid (Spain)

    1996-11-01

    The objectives of this paper are to present a computer program devoted to the simulation of solar photovoltaic power plants, namely the assessment of their power generation technical potential. The most general configuration of a former program devoted to single-field photovoltaic generators has been extended and updated to multi-field systems. This program is also intended to provide capabilities in order to assess the integration of renewable energy resources. Mainly solar and wind energy systems will be considered, as well as pumped-storage stations, of which an example is included.

  5. Renewable power needs smart storage solutions

    Energy Technology Data Exchange (ETDEWEB)

    Madison, Alison L.

    2010-10-24

    Ancient Greek philosopher Heraclitus claimed that the only thing constant in life is change, a truth we must accept and even celebrate. Another truth we face today is a growing demand for more energy to help us power the kind and pace of change we’ve become accustomed to, while minimizing environmental consequences. Renewable energy--two words that often find themselves woven into environmentally conscious dialogue. And according to Dave Lucero, director of alternative energy storage at EaglePicher Technologies LLC, the Tri-Cities should be thinking about two more: energy storage. Lucero recently addressed the Tri-Cities Research District about tackling the persistent challenge of maximizing renewable energy, which is inherently variable due to changing weather patterns. Capturing that energy and making it available for later use is vital.

  6. Operational flexibility and economics of power plants in future low-carbon power systems

    NARCIS (Netherlands)

    Brouwer, Anne Sjoerd|info:eu-repo/dai/nl/330822748; van den Broek, Machteld|info:eu-repo/dai/nl/092946895; Seebregts, Ad; Faaij, André

    2015-01-01

    Future power systems will require large shares of low-carbon generators such as renewables and power plants with Carbon Capture and Storage (CCS) to keep global warming below 2. °C. Intermittent renewables increase the system-wide demand for flexibility and affect the operation of thermal power plan

  7. Operational flexibility and economics of power plants in future low-carbon power systems

    NARCIS (Netherlands)

    Brouwer, Anne Sjoerd|info:eu-repo/dai/nl/330822748; van den Broek, Machteld|info:eu-repo/dai/nl/092946895; Seebregts, Ad; Faaij, André

    2015-01-01

    Future power systems will require large shares of low-carbon generators such as renewables and power plants with Carbon Capture and Storage (CCS) to keep global warming below 2. °C. Intermittent renewables increase the system-wide demand for flexibility and affect the operation of thermal power

  8. Cost estimation 2012 for the electrical and mechanical equipment of the power house in hydropower projects and pumped storage projects. Equipment with Pelton turbines, Francis turbines, Kaplan Turbines, Kaplan tube turbines, bulb turbines and Francis pump-turbines; Kostenschaetzung 2012 fuer die elektrische und mechanische Ausruestung des Krafthauses in Wasserkraft- und Pumpspeicher-Projekten. Ausruestung mit Pelton-, Francis-, Kaplan-, Kaplan-Rohr-, Bulb-Turbinen oder Francis-Pumpturbinen

    Energy Technology Data Exchange (ETDEWEB)

    Alvarado-Ancieta, Cesar Adolfo

    2012-07-01

    The compilation of statistical data on costs for the electrical and mechanical equipment of approximately 140 selected hydropower projects and pumped storage projects in 46 countries in America, Europe, Asia and Africa provides helpful diagrams with which the cost of the electrical and mechanical equipment of Pelton turbines, Francis turbines, Kaplan Turbines, Kaplan tube turbines, bulb turbines and Francis pump-turbines can be determined.

  9. Energy system investment model incorporating heat pumps with thermal storage in buildings and buffer tanks

    DEFF Research Database (Denmark)

    Hedegaard, Karsten; Balyk, Olexandr

    2013-01-01

    options: passive heat storage in the building structure via radiator heating, active heat storage in concrete floors via floor heating, and use of thermal storage tanks for space heating and hot water. It is shown that the model is well qualified for analysing possibilities and system benefits...... be taken into account. In this study, we present a model that facilitates analysing individual heat pumps and complementing heat storages in integration with the energy system, while optimising both investments and operation. The model incorporates thermal building dynamics and covers various heat storage...

  10. Hybrid power plants; Thermische Hybridkraftwerke

    Energy Technology Data Exchange (ETDEWEB)

    Tuschy, I. [ALSTOM Power Support, Mannheim (Germany). Bereiche Forschung und Entwicklung/Ingenieurdienstleistungen; Franke, U. [Fachhochschule Flensburg (Germany). Thermodynamik

    2002-07-01

    New German laws concerning the use of biomass and other renewable energy sources have improved the conditions for power generation with renewable energies. A promising alternative to common small-scale (combined-heat-and-) power plants could be found in so-called hybrid power plants which use renewable energies and fossil fuels in combination. A thermodynamic process analysis shows how to determine the renewable energies' portion of a hybrid power plant's total output. [German] Mit den veraenderten gesetzlichen Rahmenbedingungen erhoeht sich die Motivation, regenerative Energiequellen zur Stromerzeugung zu nutzen. Neben dem exklusiven Einsatz in kleineren (Heiz-) Kraftwerken bietet sich die gemeinsame Nutzung mit fossilen Energietraegern in sogenannten Hybridkraftwerken an. Hier stellt sich die Frage, wie der Anteil der regenerativen Energien an der Gesamt-Stromproduktion des Hybridkraftwerkes zu ermitteln ist. Eine thermodynamische Prozessanalyse kann darueber Aufschluss geben.

  11. Comparative life cycle assessment of biomass co-firing plants with carbon capture and storage

    NARCIS (Netherlands)

    Schakel, Wouter; Meerman, Hans; Talaei, Alireza; Ramírez, Andrea; Faaij, André

    2014-01-01

    Combining co-firing biomass and carbon capture and storage (CCS) in power plants offers attractive potential for net removal of carbon dioxide (CO2) from the atmosphere. In this study, the impact of co-firing biomass (wood pellets and straw pellets) on the emission profile of power plants with carbo

  12. Comparative life cycle assessment of biomass co-firing plants with carbon capture and storage

    NARCIS (Netherlands)

    Schakel, Wouter; Meerman, Hans; Talaei, Alireza; Ramírez, Andrea; Faaij, André

    2014-01-01

    Combining co-firing biomass and carbon capture and storage (CCS) in power plants offers attractive potential for net removal of carbon dioxide (CO2) from the atmosphere. In this study, the impact of co-firing biomass (wood pellets and straw pellets) on the emission profile of power plants with

  13. ALARA at nuclear power plants

    Energy Technology Data Exchange (ETDEWEB)

    Baum, J.W.

    1990-01-01

    Implementation of the As Low As Reasonably Achievable (ALARA) principle at nuclear power plants presents a continuing challenge for health physicists at utility corporate and plant levels, for plant designers, and for regulatory agencies. The relatively large collective doses at some plants are being addressed though a variety of dose reduction techniques. It is planned that this report will include material on historical aspects, management, valuation of dose reduction, quantitative and qualitative aspects of optimization, design, operational considerations, and training. The status of this work is summarized in this report. 30 refs., 1 fig., 6 tabs.

  14. Development of nonmetallic solar collector and solar-powered pump

    Science.gov (United States)

    Parker, J. C.

    1979-01-01

    Design and building of two unique components for solar heating (1. flatplate solar collector using no metal components, and 2. solar powered pump for heating and cooling systems are outlined in report. Report also discusses hardware, deliverable end items, problems encountered during fabrication and testing, and performance certification.

  15. High-power optically pumped semiconductor laser apllications

    Science.gov (United States)

    Morioka, S. Brandon

    2011-03-01

    OPS lasers have found applications in various industrial and scientific laser applications due to their power scaling capability, their wide range of emission wavelengths, physical size and their superior reliability. This paper provides an overview of commercially available OPS lasers and the applications in which they are used including biotechnology, medical, holography, Titanium-Sapphire laser pumping, non-lethal defense, forensics, and entertainment.

  16. Power Factor Improvement for Pumping Stations using Capacitor Banks

    Science.gov (United States)

    Mohamad, M. M.; Abd El-gawad, Amal F.; Ramadan, H. S.

    2016-10-01

    One of the fundamental problems affects the performance of pumping stations is its relative high operational cost. As three-phase induction motors are the main prime mover of pumping stations and considered the most widely used electrical motors due to their reliability, ease of maintenance. However, its major problem is the low power factor which results in high electric energy consumption. Energy will be saved when power factor is improved. The main objective of this paper is studying the power factor improvement in El sadaa Pumping Station because of its low operating efficiency which goes from 20 % to 25 %and calculating penalty, ponus and savings in each cases. The correction is achieved by the addition of capacitor banks in parallel with the connected motor circuits and can be applied to the starter, applied at the switchboard or the distribution panel. A model of this station is created using MatlabTM Simulink. Then the determination of induction motor parameters is performed. The station model is discussed. From the simulation results, the power factor enhancement of the pumping station is highlighted.

  17. The Lifetime of the LiFePO4/C Battery Energy Storage System When Used For Smoothing of the Wind Power Plant Variations

    DEFF Research Database (Denmark)

    Swierczynski, Maciej Jozef; Stroe, Daniel Ioan; Stan, Ana-Irina

    2013-01-01

    Fulfilling ambitious goals of the full transition from the centralized, fossil fuel-based conventional generation units into distributed and eco-friendly renewables can be difficult to achieve without energy storage systems due to technical and economical challenges. Energy storage system additio...

  18. STARFIRE: a commercial tokamak fusion power plant study

    Energy Technology Data Exchange (ETDEWEB)

    1980-09-01

    This volume contains chapters on each of the following topics: (1) radioactivity, (2) heat transport and energy conversion, (3) tritium systems, (4) electrical storage and power supplies, (5) support structure, (6) cryogenics, (7) instrumentation and control, (8) maintenance and operation, (9) balance of plant design, (10) safety and environmental analysis, (11) economic analysis, and (12) plant construction.

  19. Thermal Power Plant Performance Analysis

    CERN Document Server

    2012-01-01

    The analysis of the reliability and availability of power plants is frequently based on simple indexes that do not take into account the criticality of some failures used for availability analysis. This criticality should be evaluated based on concepts of reliability which consider the effect of a component failure on the performance of the entire plant. System reliability analysis tools provide a root-cause analysis leading to the improvement of the plant maintenance plan.   Taking in view that the power plant performance can be evaluated not only based on  thermodynamic related indexes, such as heat-rate, Thermal Power Plant Performance Analysis focuses on the presentation of reliability-based tools used to define performance of complex systems and introduces the basic concepts of reliability, maintainability and risk analysis aiming at their application as tools for power plant performance improvement, including: ·         selection of critical equipment and components, ·         defini...

  20. 可门电厂2A汽动给水泵振动故障的分析和处理%Analysis and Treatment of Vibration Fault in 2A Turbine-driven Feed Water Pump from Kemen Power Plant

    Institute of Scientific and Technical Information of China (English)

    周金顺

    2011-01-01

    可门电厂2A汽动给水泵在运行过程中发生了周期性突振的故障.通过对给水泵振动的测试和分析,得出可门电厂2号机2A汽动给水泵振动大的原因.并针对该振动,提出了有效的解决方法.%A cyclical abrupt vibration fault occurred during 2A turbine-driven feed water pump from kemen power plant running.Based on the feed water pump vibration testing and analysis,this paper come to the reason of turbine-driven feed water pump vibration.And for the vibration, we made effective solution.

  1. Central solar heating plants with seasonal storage

    Energy Technology Data Exchange (ETDEWEB)

    Breger, D.S.; Sunderland, J.E.

    1989-03-01

    The University of Massachusetts has recently started a two year effort to identify and design a significant Central Solar Heating Plant with Seasonal Storage (CSHPSS) in Massachusetts. The work is closely associated with the U.S. participation in the International Energy Agency (IEA) Task on CSHPSS. The University is working closely with the Commonwealth of Massachusetts to assist in identifying State facilities as potential sites and to explore and secure State support which will be essential for product development after the design phase. Currently, the primary site is the University of Massachusetts, Amherst campus with particular interest in several large buildings which are funded for construction over the next 4-5 years. Seasonal thermal energy storage will utilize one of several geological formations.

  2. High power diode lasers for solid-state laser pumps

    Science.gov (United States)

    Linden, Kurt J.; McDonnell, Patrick N.

    1994-02-01

    The development and commercial application of high power diode laser arrays for use as solid-state laser pumps is described. Such solid-state laser pumps are significantly more efficient and reliable than conventional flash-lamps. This paper describes the design and fabrication of diode lasers emitting in the 780 - 900 nm spectral region, and discusses their performance and reliability. Typical measured performance parameters include electrical-to-optical power conversion efficiencies of 50 percent, narrow-band spectral emission of 2 to 3 nm FWHM, pulsed output power levels of 50 watts/bar with reliability values of over 2 billion shots to date (tests to be terminated after 10 billion shots), and reliable operation to pulse lengths of 1 ms. Pulse lengths up to 5 ms have been demonstrated at derated power levels, and CW performance at various power levels has been evaluated in a 'bar-in-groove' laser package. These high-power 1-cm stacked-bar arrays are now being manufactured for OEM use. Individual diode laser bars, ready for package-mounting by OEM customers, are being sold as commodity items. Commercial and medical applications of these laser arrays include solid-state laser pumping for metal-working, cutting, industrial measurement and control, ranging, wind-shear/atmospheric turbulence detection, X-ray generation, materials surface cleaning, microsurgery, ophthalmology, dermatology, and dental procedures.

  3. State of the art on high-temperature thermal energy storage for power generation. Part 2. Case studies

    Energy Technology Data Exchange (ETDEWEB)

    Medrano, Marc; Gil, Antoni; Martorell, Ingrid; Potau, Xavi; Cabeza, Luisa F. [GREA Innovacio Concurrent, Universitat de Lleida, Pere de Cabrera s/n, 25001 Lleida (Spain)

    2010-01-15

    Power generation systems are attracting a lot of interest from researchers and companies. Storage is becoming a component with high importance to ensure system reliability and economic profitability. A few experiences of storage components have taken place until the moment in solar power plants, most of them as research initiatives. In this paper, real experiences with active storage systems and passive storage systems are compiled, giving detailed information of advantages and disadvantages of each one. Also, a summary of different technologies and materials used in solar power plants with thermal storage systems existing in the world is presented. (author)

  4. Design of Shaft Inlet/Outlet in Upper Reservoir of Liyang Pumped-storage Power Station%溧阳抽水蓄能电站上水库竖井式进/出水口设计

    Institute of Scientific and Technical Information of China (English)

    胡旺兴; 杨亚军; 李冲; 谭永华

    2013-01-01

    溧阳抽水蓄能电站上水库进/出水口为竖井式,具有结构复杂、规模庞大、地质条件较差等特点.采用数值分析方法对各设计方案进行了分析比较,并对选定的方案进行了水力模型试验验证,设计选用的体形具有较好的水力条件;进/出水口塔体上部采用框架结构,并采用无拦污栅的设计方案;通过扩大基础直径,增强结构抗倾覆稳定及地基应力的要求,解决了水力学、结构设计和基础处理等方面存在一系列的技术难题.%The inlet/outlet of upper reservoir in Liyang Pumped—storage Power Station is shaft—type with complex structure, large scale and poor foundation geological condition. Different design options of inlet/outlet are compared by numerical analysis method and the selected design option is tested by hydraulic model. The final design option has better hydraulic structure. The frame structure is chosen for the upper body of inlet/outlet tower and there is no trashrack in design. The stability against overturning and the requirements on foundation stress are met by expanding base diameter of inlet/outlet. These measures solve a series of technical problems in hydraulic design, structure design and foundation treatment of inlet/outlet.

  5. Wind power integration in Aalborg Municipality using compression heat pumps and geothermal absorption heat pumps

    DEFF Research Database (Denmark)

    Østergaard, Poul Alberg

    2013-01-01

    -temperature geothermal resources. The analyses have also demonstrated that the municipality will still rely heavily on surrounding areas for electric load balancing assistance. With a departure in a previously elaborated 100% renewable energy scenario, this article investigates how absorption heat pumps (AHP......) and compression heat pumps (HP) for the supply of DH impact the integration of wind power. Hourly scenario-analyses made using the EnergyPLAN model reveal a boiler production and electricity excess which is higher with AHPs than with HPs whereas condensing mode power generation is increased by the application......Aalborg Municipality, Denmark is investigating ways of switching to 100% renewable energy supply over the next 40 years. Analyses so far have demonstrated a potential for such a transition through energy savings, district heating (DH) and the use of locally available biomass, wind power and low...

  6. Reliability Characteristics of Power Plants

    Directory of Open Access Journals (Sweden)

    Zbynek Martinek

    2017-01-01

    Full Text Available This paper describes the phenomenon of reliability of power plants. It gives an explanation of the terms connected with this topic as their proper understanding is important for understanding the relations and equations which model the possible real situations. The reliability phenomenon is analysed using both the exponential distribution and the Weibull distribution. The results of our analysis are specific equations giving information about the characteristics of the power plants, the mean time of operations and the probability of failure-free operation. Equations solved for the Weibull distribution respect the failures as well as the actual operating hours. Thanks to our results, we are able to create a model of dynamic reliability for prediction of future states. It can be useful for improving the current situation of the unit as well as for creating the optimal plan of maintenance and thus have an impact on the overall economics of the operation of these power plants.

  7. A criticality analysis of the GBC-32 dry storage cask with Hanbit nuclear power plant unit 3 fuel assemblies from the viewpoint of burnup credit

    Energy Technology Data Exchange (ETDEWEB)

    Yun, Hyung Ju; Kim, Do Yeon; Park, Kwang Heon; Hong, Ser Gi [Dept. of Nuclear Engineering, Kyung Hee University, Seoul (Korea, Republic of)

    2016-06-15

    Nuclear criticality safety analyses (NCSAs) considering burnup credit were performed for the GBC-32 cask. The used nuclear fuel assemblies (UNFAs) discharged from Hanbit Nuclear Power Plant Unit 3 Cycle 6 were loaded into the cask. Their axial burnup distributions and average discharge burnups were evaluated using the DeCART and Multi-purpose Analyzer for Static and Transient Effects of Reactors (MASTER) codes, and NCSAs were performed using SCALE 6.1/STandardized Analysis of Reactivity for Burnup Credit using SCALE (STARBUCS) and Monte Carlo N-Particle transport code, version 6 (MCNP 6). The axial burnup distributions were determined for 20 UNFAs with various initial enrichments and burnups, which were applied to the criticality analysis for the cask system. The UNFAs for 20- and 30-year cooling times were assumed to be stored in the cask. The criticality analyses indicated that keff values for UNFAs with nonuniform axial burnup distributions were larger than those with a uniform distribution, that is, the end effects were positive but much smaller than those with the reference distribution. The axial burnup distributions for 20 UNFAs had shapes that were more symmetrical with a less steep gradient in the upper region than the reference ones of the United States Department of Energy. These differences in the axial burnup distributions resulted in a significant reduction in end effects compared with the reference.

  8. State power plant productivity programs

    Energy Technology Data Exchange (ETDEWEB)

    1981-02-01

    The findings of a working group formed to review the status of efforts by utilities and utility regulators to increase the availability and reliability of generating units are presented. Representatives from nine state regulatory agencies, NRRI, and DOE, participated on the Working Group. The Federal government has been working cooperatively with utilities, utility organizations, and with regulators to encourage and facilitate improvements in power plant productivity. Cooperative projects undertaken with regulatory and energy commissions in California, Illinois, New York, Ohio, Texas, North Carolina and Mighigan are described. Following initiation of these cooperative projects, DOE funded a survey to determine which states were explicitly addressing power plant productivity through the regulatory process. The Working Group was formed following completion of this survey. The Working Group emphasized the need for those power plant productivity improvements which are cost effective. The cost effectiveness of proposed availability improvement projects should be determined within the context of opportunities for operating and capital improvements available to an entire utility. The Working Group also identified the need for: allowing for plant designs that have a higher construction cost, but are also more reliable; allowing for recovery and reducing recovery lags for productivity-related capital expenditures; identifying and reducing disincentives in the regulatory process; ascertaining that utilities have sufficient money available to undertake timely maintenance; and support of EPRI and NERC to develop a relevant and accurate national data base. The DOE views these as extremely important aspects of any regulatory program to improve power plant productivity.

  9. Research and Development for Novel Thermal Energy Storage Systems (TES) for Concentrating Solar Power (CSP)

    Energy Technology Data Exchange (ETDEWEB)

    Faghri, Amir; Bergman, Theodore L; Pitchumani, Ranga

    2013-09-26

    The overall objective was to develop innovative heat transfer devices and methodologies for novel thermal energy storage systems for concentrating solar power generation involving phase change materials (PCMs). Specific objectives included embedding thermosyphons and/or heat pipes (TS/HPs) within appropriate phase change materials to significantly reduce thermal resistances within the thermal energy storage system of a large-scale concentrating solar power plant and, in turn, improve performance of the plant. Experimental, system level and detailed comprehensive modeling approaches were taken to investigate the effect of adding TS/HPs on the performance of latent heat thermal energy storage (LHTES) systems.

  10. 风电场中抽水蓄能电站的优化配置%The optimal allocation of pumped storage station in wind farm

    Institute of Scientific and Technical Information of China (English)

    任增; 邱晓燕; 林伟; 江东林; 王松; 魏宏芬

    2012-01-01

    为解决电力系统接入风电容量超过一定比例后引起的调峰及弃风问题,改善风电场功率输出特性,可采用与风电场配套建设抽水蓄能电站的模式.在建立风电场及抽水蓄能电站运行模型的基础上,以风电—抽水蓄能电站经济效益为目标,采用一种新的自适应遗传算法对风电—抽水蓄能电站的最佳容量配比进行求解.通过对一实际算例的仿真,表明配置适当容量的抽水蓄能电站可提高风电场的综合效益.%To solve the peak shaving and the abandoning problems caused by the wind generation installed capacity which is more than certain percentage,and to improve the output characteristics of wind power,the mode of constructing a pumped storage power station supported by wind farm can be adopted.This paper is based on modeling the wind farm and pumped storage power station operation, targets at the hybrid wind power and pumped hydro storage systems economic benefitsA new adaptive genetic algorithm is adopted to solve the best capacity ratio of pumped storage power station to wind generation.Finally,a practical example simulation result shows the combined revenues of wind farm can be improved by the proper capacity allocation of pumped storage power station.

  11. Conceptual design of advanced central receiver power systems sodium-cooled receiver concept. Volume 2, Book 1. Commercial plant conceptual design. Final report

    Energy Technology Data Exchange (ETDEWEB)

    1979-03-01

    The conceptual design of the 100-MW solar tower focus commercial power plant is described in detail. Sodium is pumped up to the top of a tall tower where the receiver is located. The sodium is heated in the receiver and then flows down the tower, through a pressure reducing device, and thence into a large, hot storage tank which is located at ground level and whose size is made to meet a specific thermal energy storage capacity requirement. From this tank, the sodium is pumped by a separate pump, through a system of sodium-to-water steam generators. The steam generator system consists of a separate superheater and reheater operating in parallel and an evaporator unit operating in series with the other two units. The sodium flowing from the evaporator unit is piped to a cold storage tank. From the cold storage tank, sodium is then pumped up to the tip of the tower to complete the cycle. The steam generated in the steam generators is fed to a conventional off-the-shelf, high-efficiency turbine. The steam loop operates in a conventional rankine cycle with the steam generators serving the same purpose as a conventional boiler and water being fed to the evaporator with conventional feedwater pumps. The pressure reducing device (a standard drag valve, for example) serves to mitigate the pressure caused by the static head of sodium and thus allows the large tanks to operate at ambient pressure conditions. (WHK)

  12. Solar-powered Rankine heat pump for heating and cooling

    Science.gov (United States)

    Rousseau, J.

    1978-01-01

    The design, operation and performance of a familyy of solar heating and cooling systems are discussed. The systems feature a reversible heat pump operating with R-11 as the working fluid and using a motor-driven centrifugal compressor. In the cooling mode, solar energy provides the heat source for a Rankine power loop. The system is operational with heat source temperatures ranging from 155 to 220 F; the estimated coefficient of performance is 0.7. In the heating mode, the vapor-cycle heat pump processes solar energy collected at low temperatures (40 to 80 F). The speed of the compressor can be adjusted so that the heat pump capacity matches the load, allowing a seasonal coefficient of performance of about 8 to be attained.

  13. Power System Transformation toward Renewables: Investment Scenarios for Germany

    OpenAIRE

    2014-01-01

    We analyze distinctive investment scenarios for the integration of fluctuating renewables in the German power system. Using a combined model for dispatch, transmission, and investment, three different investment options are considered, including gas-fired power plants, pumped hydro storage, and transmission lines. We find that geographically optimized power plant investments dominate in the reference scenarios for 2024 and 2034. In scenarios with decreasedrenewable curtailment, storage and tr...

  14. Energy storage for improvement of wind power characteristics

    DEFF Research Database (Denmark)

    Rasmussen, Claus Nygaard

    2011-01-01

    Results from simulation of the influence of energy storage on the variability and availability of wind energy are presented here. Simulations have been done using a mathematical model of energy storage implemented in MATLAB. The obtained results show the quality improvement, of energy delivered...... by a combination of wind and energy storage, in relation to the size of the energy storage. The introduction of storage enables suppression of wind power fluctuations up to a timescale proportional to the storage energy capacity. Energy storage cannot provide availability of wind power at all times, but it can...... guarantee that a certain fraction of average wind power will be available within a given timeframe. The amount of storage energy capacity necessary for significant improvement of wind power availability, within a given period, is found to be approximately 20% of the energy produced in that period...

  15. The potential role of natural gas power plants with carbon capture and storage as a bridge to a low-carbon future

    Science.gov (United States)

    The CO2 intensity of electricity produced by state-of-the-art natural gas combined-cycle turbines (NGCC) is approximately one-third that of the U.S. fleet of existing coal plants. Compared to new nuclear plants and coal plants with integrated carbon capture, NGCC has a lower inve...

  16. The potential role of natural gas power plants with carbon capture and storage as a bridge to a low-carbon future

    Science.gov (United States)

    The CO2 intensity of electricity produced by state-of-the-art natural gas combined-cycle turbines (NGCC) is approximately one-third that of the U.S. fleet of existing coal plants. Compared to new nuclear plants and coal plants with integrated carbon capture, NGCC has a lower inve...

  17. Energy storage system control strategies for power distribution systems

    OpenAIRE

    Areewan Kajorndech; Dulpichet Rerkpreedapong

    2015-01-01

    Energy storage systems have been widely employed to attain several benefits, such as reliability improvement, stabilization of power systems connected with renewable energy resources, economic benefits and etc. To achieve the above objectives, the appropriate and effective control strategies for energy storage systems are needed to be developed. This research proposes energy storage system control strategies for power distribution systems equipped with a limited size of energy storage system ...

  18. Modelling and controlling hydropower plants

    CERN Document Server

    Munoz-Hernandez, German Ardul; Jones, Dewi Ieuan

    2013-01-01

    Hydroelectric power stations are a major source of electricity around the world; understanding their dynamics is crucial to achieving good performance.  Modelling and Controlling Hydropower Plants discusses practical and well-documented cases of modelling and controlling hydropower station modelling and control, focussing on a pumped storage scheme based in Dinorwig, North Wales.  Single-input-single-output and multiple-input-multiple-output models, which cover the linear and nonlinear characteristics of pump-storage hydroelectric power stations, are reviewed. The most important dynamic features are discussed, and the verification of these models by hardware in the loop simulation is described. To show how the performance of a pump-storage hydroelectric power station can be improved, classical and modern controllers are applied to simulated models of the Dinorwig power plant. These include PID, fuzzy approximation, feed-forward and model-based predictive control with linear and hybrid prediction models. Mod...

  19. A Simple Data Analysis Method for a Pumping Test with Skin and Wellbore Storage Effects

    Directory of Open Access Journals (Sweden)

    Chia-Shyun Chen and Chuan-Gui Lan

    2009-01-01

    Full Text Available In a pumping test conducted in a con fined aquifer in northern Taiwan, drawdown in the observation well was subject to wellbore storage of its own and the combined effect of wellbore storage and skin of the nearby pumping well. For such a complicated pumping test condition, the appropriate well hydraulics solutions are complicated in mathematics and involve five unknown a priori parameters; namely, the aquifer transmissivity, the aquifer storage coefficient, the skin factor of the pumping well, and the wellbore storage co efficients of the pumping and observation wells. The conventional trial-and-er ror procedure for a simul taneous determination of these five parameters is not easy to apply. Here, a simple data analysis method is de veloped, which takes advantage of the late-time characteristics of drawdown data and the late-time asymptotic behavior of the appropriate wellhy draulics solutions. As a re sult, some currently available graphic techniques are proven us ful for the determination of these parameters. Validity of this approach is verified by the excellent agree ment between the calculated drawdown using the appropriate well hydraulics solutions with the parameter estimates obtained from the field drawdown data.

  20. Energy storage system control strategies for power distribution systems

    Directory of Open Access Journals (Sweden)

    Areewan Kajorndech

    2015-03-01

    Full Text Available Energy storage systems have been widely employed to attain several benefits, such as reliability improvement, stabilization of power systems connected with renewable energy resources, economic benefits and etc. To achieve the above objectives, the appropriate and effective control strategies for energy storage systems are needed to be developed. This research proposes energy storage system control strategies for power distribution systems equipped with a limited size of energy storage system in order to improve reliability and save energy costs by determining an optimal charging schedule of the energy storage system. Simulation results demonstrate the benefits of energy storage system applications under the different control strategies.

  1. Incorporating the Variability of Wind Power with Electric Heat Pumps

    Directory of Open Access Journals (Sweden)

    Hongyu Long

    2011-10-01

    Full Text Available With the mass introduction of wind power in Northern China, wind power variability has appeared. In this article, both existing electric heat pumps (EHPs and coal-fired combined heat and power (CHP facilities, which are generally equipped with extraction-condensing steam turbines coupled with district heating for space heating purposes, are proposed to incorporate the variability of wind power equivalently. The authors’ proposal arises from the facts that: (1 EHPs can provide space heating in the domestic sector with little thermal comfort change (e.g., energy carriers for space heating purposes can be switched from heating water to electricity; (2 coal-fired CHP units in Northern China can usually generate more electrical power corresponding to a shaved thermal power production. Thus, it is suggested that heating water from CHP units be shaved when the wind generation is low due to the variability of wind power, so as to enable more electrical power production and compensate for the corresponding insufficient wind generation. Following this, in the future and for some space heating loads at appropriate distances, electricity used as energy carrier should be converted by electric heat pumps for space heating. Thus, more electricity consumption will be achieved so as to avoid wasting wind power when the wind generation it is high. A numerical simulation is performed in order to illustrate the authors’ proposal. It is shown that the impact of variability of wind generation can be equivalently reduced to a great extent, which enable more wind power integration instead of curtailment and potential energy conservation. Moreover, in contrast to before, both the thermal and electrical power of coal-fired CHP units are no longer constants. In addition, the ratio of electrical to thermal power of CHP units is no longer constant either, and results in less energy consumption compared with fixed ratio. Finally, electricity consumed by end users’ EHPs

  2. Reducing Raman noise in parametric frequency conversion by varying the input pump power

    DEFF Research Database (Denmark)

    Friis, Søren Michael Mørk; Andersen, Lasse Mejling; Rottwitt, Karsten

    2014-01-01

    The phase-matching condition of parametric frequency conversion and the impact of Raman scattering depend on the power of two separate pumps. We show that Raman noise is reduced by asymmetrically varying the pump powers.......The phase-matching condition of parametric frequency conversion and the impact of Raman scattering depend on the power of two separate pumps. We show that Raman noise is reduced by asymmetrically varying the pump powers....

  3. Power-reduction techniques for data-center storage systems

    NARCIS (Netherlands)

    Bostoen, Tom; Mullender, Sape; Berbers, Yolande

    2013-01-01

    As data-intensive, network-based applications proliferate, the power consumed by the data-center storage subsystem surges. This survey summarizes, organizes, and integrates a decade of research on power-aware enterprise storage systems. All of the existing power-reduction techniques are classified a

  4. Reliability-oriented energy storage sizing in wind power systems

    DEFF Research Database (Denmark)

    Qin, Zian; Liserre, Marco; Blaabjerg, Frede;

    2014-01-01

    Energy storage can be used to suppress the power fluctuations in wind power systems, and thereby reduce the thermal excursion and improve the reliability. Since the cost of the energy storage in large power application is high, it is crucial to have a better understanding of the relationship...... between the size of the energy storage and the reliability benefit it can generate. Therefore, a reliability-oriented energy storage sizing approach is proposed for the wind power systems, where the power, energy, cost and the control strategy of the energy storage are all taken into account....... With the proposed approach, the computational effort is reduced and the impact of the energy storage system on the reliability of the wind power converter can be quantified....

  5. Two proposals for pumping calculations of non–newtonian fluids, water treatment plants disposal sludges case

    OpenAIRE

    H. Gardea–Villegas

    2008-01-01

    This paper presents two ways to calculate the pumping power of non Newtonian fluids and especially yield pseudoplastics which are the kind of disposal fluids from Water Treatment Plants. Fluids called sludges. The proposals included here, are based in methods suggested by Levenspiel (1986) applicable to determine the performance of Bingham plastics and pseudoplastic fluids using a graphical approximation of the rheological behavior of these materials. This approach has the advantage that is a...

  6. Battery Energy Storage Technology for power systems-An overview

    DEFF Research Database (Denmark)

    Chandrashekhara, Divya K; Østergaard, Jacob

    2009-01-01

    the present status of battery energy storage technology and methods of assessing their economic viability and impact on power system operation. Further, a discussion on the role of battery storage systems of electric hybrid vehicles in power system storage technologies had been made. Finally, the paper...... suggests a likely future outlook for the battery technologies and the electric hybrid vehicles in the context of power system applications....

  7. Coordinated control of wind power and energy storage

    OpenAIRE

    Zhao, Haoran; Wu, Qiuwei; Rasmussen, Claus Nygaard; Xu, Honghua

    2014-01-01

    Nowadays, wind power has become one of the fastest growing sources of electricity in the world. Due to the inherent variability and uncertainty, wind power integration into the grid brings challenges for power systems, particularly when the wind power penetration level is high. The challenges exist in many aspects, such as reliability, power quality and stability. With the rapid development of energy storage technology, the application of Energy Storage System (ESS) is considered as an effect...

  8. Customized electric power storage device for inclusion in a microgrid

    Energy Technology Data Exchange (ETDEWEB)

    Goldsmith, Steven Y.; Wilson, David; Robinett, III, Rush D.

    2017-08-01

    An electric power storage device included in a microgrid is described herein. The electric power storage device has at least one of a charge rate, a discharge rate, or a power retention capacity that has been customized for the microgrid. The at least one of the charge rate, the discharge rate, or the power retention capacity of the electric power storage device is computed based at least in part upon specified power source parameters in the microgrid and specified load parameters in the microgrid.

  9. Proceedings of a Topical Meeting On Small Scale Geothermal Power Plants and Geothermal Power Plant Projects

    Energy Technology Data Exchange (ETDEWEB)

    None

    1986-02-12

    These proceedings describe the workshop of the Topical Meeting on Small Scale Geothermal Power Plants and Geothermal Power Plant Projects. The projects covered include binary power plants, rotary separator, screw expander power plants, modular wellhead power plants, inflow turbines, and the EPRI hybrid power system. Active projects versus geothermal power projects were described. In addition, a simple approach to estimating effects of fluid deliverability on geothermal power cost is described starting on page 119. (DJE-2005)

  10. An Inertial-Fusion Z-Pinch Power Plant Concept

    Energy Technology Data Exchange (ETDEWEB)

    DERZON,MARK S.; ROCHAU,GARY E.; DEGROOT,J.; OLSON,CRAIG L.; PETERSON,P.; PETERSON,R.R.; SLUTZ,STEPHEN A.; ZAMORA,ANTONIO J.

    2000-12-15

    With the promising new results of fast z-pinch technology developed at Sandia National Laboratories, we are investigating using z-pinch driven high-yield Inertial Confinement Fusion (ICF) as a fusion power plant energy source. These investigations have led to a novel fusion system concept based on an attempt to separate many of the difficult fusion engineering issues and a strict reliance on existing technology, or a reasonable extrapolation of existing technology, wherever possible. In this paper, we describe the main components of such a system with a focus on the fusion chamber dynamics. The concept works with all of the electrically-coupled ICF proposed fusion designs. It is proposed that a z-pinch driven ICF power system can be feasibly operated at high yields (1 to 30 GJ) with a relatively low pulse rate (0.01-0.1 Hz). To deliver the required current from the rep-rated pulse power driver to the z-pinch diode, a Recyclable Transmission Line (RTL) and the integrated target hardware are fabricated, vacuum pumped, and aligned prior to loading for each power pulse. In this z-pinch driven system, no laser or ion beams propagate in the chamber such that the portion of the chamber outside the RTL does not need to be under vacuum. Additionally, by utilizing a graded-density solid lithium or fluorine/lithium/beryllium eutectic (FLiBe) blanket between the source and the first-wall the system can breed its own fuel absorb a large majority of the fusion energy released from each capsule and shield the first-wall from a damaging neutron flux. This neutron shielding significantly reduces the neutron energy fluence at the first-wall such that radiation damage should be minimal and will not limit the first-wall lifetime. Assuming a 4 m radius, 8 m tall cylindrical chamber design with an 80 cm thick spherical FLiBe blanket, our calculations suggest that a 20 cm thick 6061-T6 Al chamber wall will reach the equivalent uranium ore radioactivity level within 100 years after a 30

  11. An Inertial-Fusion Z-Pinch Power Plant Concept

    Energy Technology Data Exchange (ETDEWEB)

    DERZON,MARK S.; ROCHAU,GARY E.; DEGROOT,J.; OLSON,CRAIG L.; PETERSON,P.; PETERSON,R.R.; SLUTZ,STEPHEN A.; ZAMORA,ANTONIO J.

    2000-12-15

    With the promising new results of fast z-pinch technology developed at Sandia National Laboratories, we are investigating using z-pinch driven high-yield Inertial Confinement Fusion (ICF) as a fusion power plant energy source. These investigations have led to a novel fusion system concept based on an attempt to separate many of the difficult fusion engineering issues and a strict reliance on existing technology, or a reasonable extrapolation of existing technology, wherever possible. In this paper, we describe the main components of such a system with a focus on the fusion chamber dynamics. The concept works with all of the electrically-coupled ICF proposed fusion designs. It is proposed that a z-pinch driven ICF power system can be feasibly operated at high yields (1 to 30 GJ) with a relatively low pulse rate (0.01-0.1 Hz). To deliver the required current from the rep-rated pulse power driver to the z-pinch diode, a Recyclable Transmission Line (RTL) and the integrated target hardware are fabricated, vacuum pumped, and aligned prior to loading for each power pulse. In this z-pinch driven system, no laser or ion beams propagate in the chamber such that the portion of the chamber outside the RTL does not need to be under vacuum. Additionally, by utilizing a graded-density solid lithium or fluorine/lithium/beryllium eutectic (FLiBe) blanket between the source and the first-wall the system can breed its own fuel absorb a large majority of the fusion energy released from each capsule and shield the first-wall from a damaging neutron flux. This neutron shielding significantly reduces the neutron energy fluence at the first-wall such that radiation damage should be minimal and will not limit the first-wall lifetime. Assuming a 4 m radius, 8 m tall cylindrical chamber design with an 80 cm thick spherical FLiBe blanket, our calculations suggest that a 20 cm thick 6061-T6 Al chamber wall will reach the equivalent uranium ore radioactivity level within 100 years after a 30

  12. 1MW塔式太阳能电站蓄热系统模拟分析%SIMULATION OF THERMAL STORAGE SYSTEM FOR 1MW SOLAR POWER TOWER PLANT

    Institute of Scientific and Technical Information of China (English)

    李显; 朱天宇; 徐小韵; 黄燎原

    2011-01-01

    以1MW塔式太阳能电站蓄热系统为研究对象,通过理论分析,建立了管壳式换热器、热罐、冷罐以及蒸汽蓄热器的动态数学模型,经验证模型具有合理性.在此基础上对蓄热系统的充、放热过程进行了模拟计算,分析研究了换热器A和C的动态特性、冷热罐内油温的动态变化以及蒸汽蓄热器的充、放热特性.模拟结果为双级蓄热系统的过程控制提供了理论依据.%Through theoretical analysis, the dynamic numerical models were established to research the thermal storage system for 1MW solar power tower plant, such as shell-and-tube heat exchangers, hot tank, coid tank, and steam accumulator. The dynamic numerical models were proved correct. On that basis, the dynamic behavior of thermal storage system was simulated including charge mode and discharge mode. The dynamic characteristics of heat exchanger network A and C, the oil temperature of hot tank and cold tank, charge and discharge behavior of steam accumulator were studied.Results of simulation provide a theoretical foundation for control of double-stage thermal storage system.

  13. Optimisation of a storage facility used to effect power control in the PBMR power cycle

    OpenAIRE

    Mathews, Edward A; Pelzer, Ruaan; Matimba, A

    2008-01-01

    This article presents the optimization of a gas storage facility used to effect power control in South Africa's PBMR power cycle. It was shown in the article, a multitank storage facility to affect power control in the PBMR power cyclel, that a multi tank design with heat capacitance improves storage effictiveness, which could make the system cheaper. This storage facility is known as the Inventory Control System (ICS). The focus in this article is to determine an optimum numbe...

  14. 76 FR 30936 - West Maui Pumped Storage Water Supply, LLC; Notice of Preliminary Permit Application Accepted for...

    Science.gov (United States)

    2011-05-27

    ... Energy Regulatory Commission West Maui Pumped Storage Water Supply, LLC; Notice of Preliminary Permit... April 1, 2011, West Maui Pumped Storage Water Supply, LLC, filed an application for a preliminary permit... supply project effluent water to an existing irrigation system; (5) a powerhouse with two...

  15. Mobile hydraulic power supply. Liquid piston Stirling engine pump

    Energy Technology Data Exchange (ETDEWEB)

    Ven, James D. van de [100 Institute Road, Department of Mechanical Engineering, Worcester Polytechnic Institute, Worcester, MA 01609 (United States)

    2009-11-15

    Conventional mobile hydraulic power supplies involve numerous kinematic connections and are limited by the efficiency, noise, and emissions of internal combustion engines. The Stirling cycle possesses numerous benefits such as the ability to operate from any heat source, quiet operation, and high theoretical efficiency. The Stirling engine has seen limited success due to poor heat transfer in the working chambers, difficulty sealing low-molecular weight gases at high pressure, and non-ideal piston displacement profiles. As a solution to these limitations, a liquid piston Stirling engine pump is proposed. The liquid pistons conform to irregular volumes, allowing increased heat transfer through geometry features on the interior of the working chambers. Creating near-isothermal operation eliminates the costly external heat exchangers and increases the engine efficiency through decreasing the engine dead space. The liquid pistons provide a positive gas seal and thermal transport to the working chambers. Controlling the flow of the liquid pistons with valves enables matching the ideal Stirling cycle and creates a direct hydraulic power supply. Using liquid hydrogen as a fuel source allows cooling the compression side of the engine before expanded the fuel into a gas and combusting it to heat the expansion side of the engine. Cooling the compression side not only increases the engine power, but also significantly increases the potential thermal efficiency of the engine. A high efficiency Stirling engine makes energy regeneration through reversing the Stirling cycle practical. When used for regeneration, the captured energy can be stored in thermal batteries, such as a molten salt. The liquid piston Stirling engine pump requires further research in numerous areas such as understanding the behavior of the liquid pistons, modeling and optimization of a full engine pump, and careful selection of materials for the extreme operating temperatures. Addressing these obtainable

  16. Design of power control system using SMES and SVC for fusion power plant

    Science.gov (United States)

    Niiyama, K.; Yagai, T.; Tsuda, M.; Hamajima, T.

    2008-02-01

    A SMES (Superconducting Magnetic Energy Storage System) system with converter composed of self-commutated valve devices such as GTO and IGBT is available to control active and reactive power simultaneously. A SVC (Static Var Compensators) or STATCOM (Static Synchronous Compensator) is widely employed to reduce reactive power in power plants and substations. Owing to progress of power electronics technology using GTO and IGBT devices, power converters in the SMES system and the SVC can easily control power flow in few milliseconds. Moreover, since the valve devices for the SMES are equivalent to those for the SVC, the device cost must be reduced. In this paper the basic control system combined with the SMES and SVC is designed for large pulsed loads of a nuclear fusion power plant. This combined system largely expands the reactive power control region as well as the active one. The simulation results show that the combined system is effective and prospective for the nuclear fusion power plant.

  17. 76 FR 15971 - Eagle Mountain Pumped Storage Hydroelectric Project; Eagle Crest Energy; Notice of Teleconference

    Science.gov (United States)

    2011-03-22

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Eagle Mountain Pumped Storage Hydroelectric Project; Eagle Crest Energy... Eagle Crest Energy as part of its on-going Section 7 Endangered Species Act consultation efforts. e....

  18. 76 FR 22699 - Eagle Mountain Pumped Storage Hydroelectric Project, Eagle Crest Energy; Notice of Teleconference

    Science.gov (United States)

    2011-04-22

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Eagle Mountain Pumped Storage Hydroelectric Project, Eagle Crest Energy... Eagle Crest Energy as part of its on-going Section 7 Endangered Species Act consultation efforts. e....

  19. A predictive model for smart control of a domestic heat pump and thermal storage

    NARCIS (Netherlands)

    van Leeuwen, Richard Pieter; Gebhardt, I.; de Wit, J.B.; Smit, Gerardus Johannes Maria

    The purpose of this paper is to develop and validate a predictive model of a thermal storage which is charged by a heat pump and used for domestic hot water supply. The model is used for smart grid control purposes and requires measurement signals of flow and temperature at the inlet and outlet of

  20. A predictive model for smart control of a domestic heat pump and thermal storage

    NARCIS (Netherlands)

    Leeuwen, van R.P.; Gebhardt, I.; Wit, de J.B.; Smit, G.J.M.

    2016-01-01

    The purpose of this paper is to develop and validate a predictive model of a thermal storage which is charged by a heat pump and used for domestic hot water supply. The model is used for smart grid control purposes and requires measurement signals of flow and temperature at the inlet and outlet of t

  1. 30 CFR 57.4262 - Underground transformer stations, combustible liquid storage and dispensing areas, pump rooms...

    Science.gov (United States)

    2010-07-01

    ... 30 Mineral Resources 1 2010-07-01 2010-07-01 false Underground transformer stations, combustible... and Control Firefighting Equipment § 57.4262 Underground transformer stations, combustible liquid storage and dispensing areas, pump rooms, compressor rooms, and hoist rooms. Transformer stations,...

  2. 76 FR 20624 - Oglethorpe Power Corporation: Proposed Biomass Power Plant

    Science.gov (United States)

    2011-04-13

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF AGRICULTURE Rural Utilities Service Oglethorpe Power Corporation: Proposed Biomass Power Plant AGENCY: Rural... Corporation (Oglethorpe) for the construction of a 100 megawatt (MW) biomass plant and related...

  3. Optimal Power Flow in Microgrids with Energy Storage

    DEFF Research Database (Denmark)

    Levron, Yoash; Guerrero, Josep M.; Beck, Yuval

    2013-01-01

    , these works assume flat, highly simplified network models, which overlook the physical connectivity. This work proposes an optimal power flow solution that considers the entire system: the storage device limits, voltages limits, currents limits, and power limits. The power network may be arbitrarily complex......Energy storage may improve power management in microgrids that include renewable energy sources. The storage devices match energy generation to consumption, facilitating a smooth and robust energy balance within the microgrid. This paper addresses the optimal control of the microgrid’s energy...... storage devices. Stored energy is controlled to balance power generation of renewable sources to optimize overall power consumption at the microgrid point of common coupling. Recent works emphasize constraints imposed by the storage device itself, such as limited capacity and internal losses. However...

  4. Development of Discrete Power Supply with Charge Pump Method for High Powered Sonar System

    Directory of Open Access Journals (Sweden)

    Kristian Ismail

    2012-07-01

    Full Text Available Power supply is one of the electronic devices that can provide electric energy for electronic systems or other systems. There are several types of power supplies that can be applied depend on the requirement and functions. One example is the use of power supply for sonar systems. Sonar system is a device which can be used to detect a target under water. The sonar system is an electronic circuit that requires a power supply with specific characteristics when the sonar functions as a transmitter and a receiver in the specific span time (when on and the specific lag time (when off. This paper discusses the design of power supply for high-powered sonar systems with discrete methods in which high power supply is only applied when the acoustic waves radiated under water. Charge pump was used to get the appropriate output voltage from lower input voltage. Charge pump utilized a combination of series and parallel connections of capacitors. The working mode of this power supply used the lag time as the calculation of time to charge charge pump capacitors in parallel while the span time was used for the calculation of discharging the charge pump capacitors in series.

  5. Computer simulation of ground coupled storage in a series solar assisted heat pump system

    Energy Technology Data Exchange (ETDEWEB)

    Andrews, John W.; Metz, Philip D.

    1979-01-01

    A quantitative study of the effect of thermal coupling between the ground and the heat storage element of a series solar assisted heat pump system is presented. The transient simulation computer program TRNSYS is used to simulate the solar portion of this system. A program to simulate the thermal interaction of the storage element with the ground is incorporated into TRNSYS as a sub-routine. This program calculates heat flow through the ground in discrete steps over space and time. Boundary conditions are established. The ground coupled storage is driven by thermal inputs from the solar portion of the system and from the changing ambient and ground temperatures.

  6. Reducing Pumping Power in Hydronic Heating and Cooling Systems with Microencapsulated Phase Change Material Slurries

    Science.gov (United States)

    Karas, Kristoffer Jason

    Phase change materials (PCMs) are being used increasingly in a variety of thermal transfer and thermal storage applications. This thesis presents the results of a laboratory study into the feasibility of improving the performance of hydronic heating and cooling systems by adding microcapsules filled with a PCM to the water used as heat transport media in these systems. Microencapsulated PCMs (MPCMs) increase the heat carrying capacity of heat transport liquids by absorbing or releasing heat at a constant temperature through a change of phase. Three sequences of tests and their results are presented: 1) Thermal cycling tests conducted to determine the melting temperatures and extent of supercooling associated with the MPCMs tested. 2) Hydronic performance tests in which MPCM slurries were pumped through a fin-and-tube, air-to-liquid heat exchanger and their thermal transfer performance compared against that of ordinary water. 3) Mechanical stability tests in which MPCM slurries were pumped in a continuous loop in order to gauge the extent of rupture due to pumping. It is shown that slurries consisting of water and MPCMs ˜ 14-24 mum in diameter improve thermal performance and offer the potential for power savings in the form of reduced pumping requirements. In addition, it is shown that while slurries of MPCMs 2-5 mum in diameter appear to exhibit better mechanical stability than slurries of larger diameter MPCMs, the smaller MPCMs appear to reduce the thermal performance of air-to-liquid heat exchangers.

  7. Short-Term Planning of Hybrid Power System

    Science.gov (United States)

    Knežević, Goran; Baus, Zoran; Nikolovski, Srete

    2016-07-01

    In this paper short-term planning algorithm for hybrid power system consist of different types of cascade hydropower plants (run-of-the river, pumped storage, conventional), thermal power plants (coal-fired power plants, combined cycle gas-fired power plants) and wind farms is presented. The optimization process provides a joint bid of the hybrid system, and thus making the operation schedule of hydro and thermal power plants, the operation condition of pumped-storage hydropower plants with the aim of maximizing profits on day ahead market, according to expected hourly electricity prices, the expected local water inflow in certain hydropower plants, and the expected production of electrical energy from the wind farm, taking into account previously contracted bilateral agreement for electricity generation. Optimization process is formulated as hourly-discretized mixed integer linear optimization problem. Optimization model is applied on the case study in order to show general features of the developed model.

  8. Comparison of different side-pumping configurations for high power laser diode pumped solid-state laser

    Institute of Scientific and Technical Information of China (English)

    Junqing Meng(孟俊清); Weibiao Chen(陈卫标); Xia Hou(侯霞); Qiquan Hu(胡企铨)

    2003-01-01

    Ray-tracing method is used to simulate the distribution of absorption in crystal rod for different sidepumping configuration. The distribution of pumping power and absorption efficiency is compared, and the numerical results are presented. The results show that the more uniform pumping and the higher absorption coefficient are obtained with a diffuse cavity. And the method of the slow axis of laser diode stack perpendicular to the axis of lasing gives the higher central pumping density.

  9. Underground pumped storage hydroelectricity using abandoned works (deep mines or open pits) and the impact on groundwater flow

    Science.gov (United States)

    Pujades, Estanislao; Willems, Thibault; Bodeux, Sarah; Orban, Philippe; Dassargues, Alain

    2016-09-01

    Underground pumped storage hydroelectricity (UPSH) plants using open-pit or deep mines can be used in flat regions to store the excess of electricity produced during low-demand energy periods. It is essential to consider the interaction between UPSH plants and the surrounding geological media. There has been little work on the assessment of associated groundwater flow impacts. The impacts on groundwater flow are determined numerically using a simplified numerical model which is assumed to be representative of open-pit and deep mines. The main impact consists of oscillation of the piezometric head, and its magnitude depends on the characteristics of the aquifer/geological medium, the mine and the pumping and injection intervals. If an average piezometric head is considered, it drops at early times after the start of the UPSH plant activity and then recovers progressively. The most favorable hydrogeological conditions to minimize impacts are evaluated by comparing several scenarios. The impact magnitude will be lower in geological media with low hydraulic diffusivity; however, the parameter that plays the more important role is the volume of water stored in the mine. Its variation modifies considerably the groundwater flow impacts. Finally, the problem is studied analytically and some solutions are proposed to approximate the impacts, allowing a quick screening of favorable locations for future UPSH plants.

  10. Seismic hazard mitigation for nuclear power plant

    Institute of Scientific and Technical Information of China (English)

    Frieder Seible

    2013-01-01

    The seismic safety of nuclear power plant(NPP) has always been a major consideration in the site selection,design,operation,and more recently recertification of existing installations.In addition to the actual NPP and all their operational and safety related support systems,the storage of spent fuel in temporary or permanent storage facilities also poses a seismic risk.This seismic risk is typically assessed with state-of-the-art modeling and analytical tools that capture everything from the ground rupture or source of the earthquake to the site specific ground shaking,taking geotechnical parameters and soil-foundation-structure-interaction (SFSI) into account to the non-linear structural response of the reactor core,the containment structure,the core cooling system and the emergency cooling system(s),to support systems,piping systems and non-structural components,and finally the performance of spent fuel storage in the probabilistically determined operational basis earthquake (OBE) or the safe shutdown earthquake (SSE) scenario.The best and most meaningful validation and verification of these advanced analytical tools is in the form of full or very large scale experimental testing,designed and conducted in direct support of model and analysis tool calibration.This paper outlines the principles under which such calibration testing should be conducted and illustrates with examples the kind of testing and parameter evaluation required.

  11. The potential of renewables versus natural gas with CO2 capture and storage for power generation under CO2 constraints

    NARCIS (Netherlands)

    Van Den Broek, Machteld|info:eu-repo/dai/nl/092946895; Berghout, Niels|info:eu-repo/dai/nl/328201057; Rubin, Edward S.

    2015-01-01

    The costs of intermittent renewable energy systems (IRES) and power storage technologies are compared on a level playing field to those of natural gas combined cycle power plants with CO2 capture and storage (NGCC-CCS). To account for technological progress over time, an "experience curve

  12. The potential of renewables versus natural gas with CO2 capture and storage for power generation under CO2 constraints

    NARCIS (Netherlands)

    Van Den Broek, Machteld; Berghout, Niels; Rubin, Edward S.

    2015-01-01

    The costs of intermittent renewable energy systems (IRES) and power storage technologies are compared on a level playing field to those of natural gas combined cycle power plants with CO2 capture and storage (NGCC-CCS). To account for technological progress over time, an "experience curve

  13. The potential of renewables versus natural gas with CO2 capture and storage for power generation under CO2 constraints

    NARCIS (Netherlands)

    Van Den Broek, Machteld; Berghout, Niels; Rubin, Edward S.

    2015-01-01

    The costs of intermittent renewable energy systems (IRES) and power storage technologies are compared on a level playing field to those of natural gas combined cycle power plants with CO2 capture and storage (NGCC-CCS). To account for technological progress over time, an "experience

  14. High-power diode-pumped Tm:YLF slab laser

    CSIR Research Space (South Africa)

    Schellhorn, M

    2009-06-01

    Full Text Available The aim is to develop a high-power Tm:YLF slab laser which can be utilized to pump a Ho slab laser. A 68 W Tm:YLF slab laser was recently presented in [1] pumped from one end by a single 6-bar stack delivering ~300 W of pump power. In this work, we...

  15. Annual Energy Production (AEP) optimization for tidal power plants based on Evolutionary Algorithms - Swansea Bay Tidal Power Plant AEP optimization

    Science.gov (United States)

    Kontoleontos, E.; Weissenberger, S.

    2016-11-01

    In order to be able to predict the maximum Annual Energy Production (AEP) for tidal power plants, an advanced AEP optimization procedure is required for solving the optimization problem which consists of a high number of design variables and constraints. This efficient AEP optimization procedure requires an advanced optimization tool (EASY software) and an AEP calculation tool that can simulate all different operating modes of the units (bidirectional turbine, pump and sluicing mode). The EASY optimization software is a metamodel-assisted Evolutionary Algorithm (MAEA) that can be used in both single- and multi-objective optimization problems. The AEP calculation tool, developed by ANDRITZ HYDRO, in combination with EASY is used to maximize the tidal annual energy produced by optimizing the plant operation throughout the year. For the Swansea Bay Tidal Power Plant project, the AEP optimization along with the hydraulic design optimization and the model testing was used to evaluate all different hydraulic and operating concepts and define the optimal concept that led to a significant increase of the AEP value. This new concept of a triple regulated “bi-directional bulb pump turbine” for Swansea Bay Tidal Power Plant (16 units, nominal power above 320 MW) along with its AEP optimization scheme will be presented in detail in the paper. Furthermore, the use of an online AEP optimization during operation of the power plant, that will provide the optimal operating points to the control system, will be also presented.

  16. Low-power communication with a photonic heat pump.

    Science.gov (United States)

    Huang, Duanni; Santhanam, Parthiban; Ram, Rajeev J

    2014-12-15

    An optical communication channel is constructed using a heated thermo-electrically pumped, high efficiency infrared light-emitting diode (LED). In these devices, electro-luminescent cooling is observed, resulting in greater than unity (> 100%) efficiency in converting electrical power to optical power. The average amount of electrical energy required to generate a photon (4.3 meV) is much less than the optical energy in that photon (520 meV). Such a light source can serve as a test-bed for fundamental studies of energy-efficient bosonic communication channels. In this low energy consumption mode, we demonstrate data transmission at 3 kilobits per second (kbps) with only 120 picowatts of input electric power. Although the channel employs a mid-infrared source with limited quantum efficiency, a binary digit can be communicated using 40 femtojoules with a bit error rate of 3 x 10-3.

  17. Determination of Main Noise Sources in a Thermal Power plant

    Directory of Open Access Journals (Sweden)

    M. Jahangiri

    2014-09-01

    Full Text Available Introduction: The Power plants are as the major industries that have a large number of workers, providing they health is important. Exposure to occupational noise is the pervasive physical agent in industries like power plants and may impact health and for safety status for people. Determination of the sources of noise in workplaces is important step in noise control plans. This study aimed to assess noise pollution and determine the main sources of noise in a power plant for. .Material and Method: This descriptive cross-sectional study was conducted on the ground floor of the turbine unit of a thermal power plant. Measurements was done based on the ISO-9612 and ISO-11200 standard using by the calibrated sound level meter model TES-1389 on “A” frequency weighting and “Slow” mode for time response. Surfer V.10 software was used for interpolation and noise maps producing. Based on grid method measuring for indicating of noise propagation, we set buffer of danger areas to determine main sources of noise. Also, we used the minimized grid method for measuring and study of noise denotation in vertical surface in each main sources. .Result: The results showed that the measured indoor sound pressure level in all areas where at the risk category of the units. The highest average sound pressure level was belonged to the unit 2, with 93.1 dB(A. We find the feed water pumps were the main sources in all of the studied units. Among the four main components of the main sources, the highest noise levels associated with the main pump and the gearbox section with about 100 9B(L and dominant frequency of 2000 Hz. .Conclusion: Considering that feed water pumps had major sources in indoor power plant noise pollution, engineering noise control such as providing enclosures is necessary to reduce noise pollution to safe levels in the studied plant it is necessary.

  18. Intelligent Energy Management System for Virtual Power Plants

    DEFF Research Database (Denmark)

    Braun, Philipp

    . Once the BESS is purchased and grid connected: When should the VPP submit bids to which power market and in what quantity? 3. Once the awards on the power market are announced and the latest wind power production forecast is available: How should the VPP be operated in order to face minimum penalty...... power plants (VPPs). In this work, VPPs refer to wind power plants (WPPs) connected to an electrical battery energy storage system (BESS) which is in close proximity to the WPP, and both plants are able to participate in the Danish power market (ancillary service markets and day-ahead market). BESSs...... questions depending on the input parameters provided to the model. The model focuses on the BESS including capacity fade which is a battery specific property. It determines the performance, live-time, and - most important - the annualized costs of the BESS. Modeling capacity fade opens up the possibility...

  19. Advanced Coordinating Control System for Power Plant

    Institute of Scientific and Technical Information of China (English)

    WU Peng; WEI Shuangying

    2006-01-01

    The coordinating control system is popular used in power plant. This paper describes the advanced coordinating control by control methods and optimal operation, introduces their principals and features by using the examples of power plant operation. It is wealthy for automation application in optimal power plant operation.

  20. Investigation of Hg/sub 2/ as a discharge pumped optical storage medium

    Energy Technology Data Exchange (ETDEWEB)

    Ehrlich, D J; Osgood, Jr, R M

    1978-12-01

    The report describes work performed in the period 1 October 1977 to 30 September 1978 on the extraction of energy from metastable Hg/sub 2/ by optical techniques. The major accomplishments have included: (1) assessment of optical extraction techniques for laser fusion applications; (2) demonstration of 20X enhancements in the population of the UV-radiating level by optical pumping with mid-IR lasers; (3) analysis of the IR optical pumping process through the induced emission spectrum; (4) parametric studies of the excitation wavelength, temperature and pressure dependences of extraction by optical pumping; (5) studies of the saturation of mid-IR optical pumping; (6) modeling of large-scale extraction for laser fusion applications; (7) studies of optical pumping of Hg/sub 2/ by high power ArF laser (193 nm) radiation; and (8) studies of Hg/sub 2/ excimer structure and collisional destruction rates.

  1. An Evaluation of Energy Storage Options for Nuclear Power

    Energy Technology Data Exchange (ETDEWEB)

    Coleman, Justin L. [Idaho National Lab. (INL), Idaho Falls, ID (United States); Bragg-Sitton, Shannon M. [Idaho National Lab. (INL), Idaho Falls, ID (United States); Dufek, Eric J. [Idaho National Lab. (INL), Idaho Falls, ID (United States)

    2017-06-01

    Energy supply, distribution, and demand are continuing to evolve as new generation sources come online and new appliances are installed. A larger percentage of the United States (U.S.) energy mix is provided by variable energy sources such as wind and solar each year, and distributed generation is becoming more common. In parallel, an evolution in consumer products such as electrical vehicles, information technology devices for residential and industrial applications, and appliances is changing how energy is consumed. As a result of these trends, nuclear power plants (NPPs) are being called upon to operate more flexibly than ever before. Furthermore, advanced nuclear power plants (A-NPPs) might operate as part of an electricity system that looks very different than when the current NPP fleet was constructed. A-NPPs face the possibility that they will need to operate in an environment where flexibility (e.g., fast ramping) is more highly valued than stability (e.g., baseload generation for conventional demand curves). The current fleet of NPPs is struggling to remain economical in competitive markets in an era of historically low natural gas prices and renewable sources with very low marginal costs. These factors, overlaid with an ambiguous national policy related to nuclear energy and a decision-making context that struggles with multi-decade capital investments, raise key questions and present significant challenges to the economics of nuclear power in the evolving grid. Multiple factors could improve the economics of A-NPPs, including: (1) minimizing the need for active safety systems, (2) minimizing adoption of one-off reactor designs, (3) establishing policies that credit low carbon emitting technologies, and (4) integrating energy storage technologies that increase revenue and reduce costs through a combination of ancillary services, market hedging, and reduced costs via stable operation. This report focuses on Item (4), containing an overview, synthesis, and

  2. The hydrodynamic instability of powerful cylindrical magnetohydrodynamic pumps

    Energy Technology Data Exchange (ETDEWEB)

    Valdmane, R.A.; Ulmanis, L.Ya.; Valdamanis, Ya.Ya.

    1984-01-01

    A numerical calculation is the basis for analyzing the issues of stability of the speed profile in channels of powerful cylindrical magnetohydrodynamic (MGD) pumps. A one dimensional hydraulic model is used in the calculations. The questions about stability of movement relative to transverse perturbations in speed are discussed. It is shown that at high values of the parameter epsilon and the radius of the channel the movement is unstable with respect to the transverse shifts. The results are of interest for studies of liquid metal magnetohydrodynamic generators.

  3. Water Storage Instead of Energy Storage for Desalination Powered by Renewable Energy—King Island Case Study

    Directory of Open Access Journals (Sweden)

    Aya Tafech

    2016-10-01

    Full Text Available In this paper, we scrutinized the energy storage options used in mitigation of the intermittent nature of renewable energy resources for desalination process. In off-grid islands and remote areas, renewable energy is often combined with appropriate energy storage technologies (ESTs to provide a consistent and reliable electric power source. We demonstrated that in developing a renewable energy scheme for desalination purposes, product (water storage is a more reliable and techno-economic solution. For a King Island (Southeast Australia case-study, electric power production from renewable energy sources was sized under transient conditions to meet the dynamic demand of freshwater throughout the year. Among four proposed scenarios, we found the most economic option by sizing a 13 MW solar photovoltaic (PV field to instantly run a proportional RO desalination plant and generate immediate freshwater in diurnal times without the need for energy storage. The excess generated water was stored in 4 × 50 ML (mega liter storage tanks to meet the load in those solar deficit times. It was also demonstrated that integrating well-sized solar PV with wind power production shows more consistent energy/water profiles that harmonize the transient nature of energy sources with the water consumption dynamics, but that would have trivial economic penalties caused by larger desalination and water storage capacities.

  4. Optimizing the pumping configuration for the power scaling of in-band pumped erbium doped fiber amplifiers.

    Science.gov (United States)

    Lim, Ee-Leong; Alam, Shaif-ul; Richardson, David J

    2012-06-18

    A highly efficient (~80%), high power (18.45 W) in-band, core pumped erbium/ytterbium co-doped fiber laser is demonstrated. To the best of our knowledge, this is the highest reported efficiency from an in-band pumped 1.5 µm fiber laser operating in the tens of watts regime. Using a fitted simulation model, we show that the significantly sub-quantum limit conversion efficiency of in-band pumped erbium doped fiber amplifiers observed experimentally can be explained by concentration quenching. We then numerically study and experimentally validate the optimum pumping configuration for power scaling of in-band, cladding pumped erbium doped fiber amplifiers. Our simulation results indicate that a ~77% power conversion efficiency with high output power should be possible through cladding pumping of current commercially available pure Erbium doped active fibers providing the loss experienced by the cladding guided 1535 nm pump due to the coating absorption can be reduced to an acceptable level by better coating material choice. The power conversion efficiency has the potential to exceed 90% if concentration quenching of erbium ions can be reduced via improvements in fiber design and fabrication.

  5. Gain and noise penalty for detuned 980 nm pumping or erbium-doped fiber power amplifiers

    DEFF Research Database (Denmark)

    Pedersen, B.; Chirravuri, J.; Miniscalco, W. J.

    1992-01-01

    The impact of altering the fiber length and pump wavelength on the gain and noise performance of erbium-doped fiber power amplifiers pumped in the 980-nm band is examined. A gain penalty of......The impact of altering the fiber length and pump wavelength on the gain and noise performance of erbium-doped fiber power amplifiers pumped in the 980-nm band is examined. A gain penalty of...

  6. Modelling of nuclear power plant decommissioning financing.

    Science.gov (United States)

    Bemš, J; Knápek, J; Králík, T; Hejhal, M; Kubančák, J; Vašíček, J

    2015-06-01

    Costs related to the decommissioning of nuclear power plants create a significant financial burden for nuclear power plant operators. This article discusses the various methodologies employed by selected European countries for financing of the liabilities related to the nuclear power plant decommissioning. The article also presents methodology of allocation of future decommissioning costs to the running costs of nuclear power plant in the form of fee imposed on each megawatt hour generated. The application of the methodology is presented in the form of a case study on a new nuclear power plant with installed capacity 1000 MW.

  7. Transportation and storage of foreign spent power reactor fuel

    Energy Technology Data Exchange (ETDEWEB)

    1979-09-30

    This report describes the generic actions to be taken by the Department of Energy, in cooperation with other US government agencies, foreign governments, and international organizations, in support of the implementation of Administration policies with respect to the following international spent fuel management activities: bilateral cooperation related to expansion of foreign national storage capacities; multilateral and international cooperation related to development of multinational and international spent fuel storage regimes; fee-based transfer of foreign spent power reactor fuel to the US for storage; and emergency transfer of foreign spent power reactor fuel to the US for storage.

  8. Modelling and simulation of thermal power plants

    Energy Technology Data Exchange (ETDEWEB)

    Eborn, J.

    1998-02-01

    Mathematical modelling and simulation are important tools when dealing with engineering systems that today are becoming increasingly more complex. Integrated production and recycling of materials are trends that give rise to heterogenous systems, which are difficult to handle within one area of expertise. Model libraries are an excellent way to package engineering knowledge of systems and units to be reused by those who are not experts in modelling. Many commercial packages provide good model libraries, but they are usually domain-specific and closed. Heterogenous, multi-domain systems requires open model libraries written in general purpose modelling languages. This thesis describes a model database for thermal power plants written in the object-oriented modelling language OMOLA. The models are based on first principles. Subunits describe volumes with pressure and enthalpy dynamics and flows of heat or different media. The subunits are used to build basic units such as pumps, valves and heat exchangers which can be used to build system models. Several applications are described; a heat recovery steam generator, equipment for juice blending, steam generation in a sulphuric acid plant and a condensing steam plate heat exchanger. Model libraries for industrial use must be validated against measured data. The thesis describes how parameter estimation methods can be used for model validation. Results from a case-study on parameter optimization of a non-linear drum boiler model show how the technique can be used 32 refs, 21 figs

  9. High power resonant pumping of Tm-doped fiber amplifiers in core- and cladding-pumped configurations.

    Science.gov (United States)

    Creeden, Daniel; Johnson, Benjamin R; Rines, Glen A; Setzler, Scott D

    2014-11-17

    We have demonstrated ultra-high efficiency amplification in Tm-doped fiber with both core- and cladding-pumped configurations using a resonant tandem-pumping approach. These Tm-doped fiber amplifiers are pumped in-band with a 1908 nm Tm-doped fiber laser and operate at 1993 nm with >90% slope efficiency. In a core-pumped configuration, we have achieved 92.1% slope efficiency and 88.4% optical efficiency at 41 W output power. In a cladding-pumped configuration, we have achieved 123.1 W of output power with 90.4% optical efficiency and a 91.6% slope efficiency. We believe these are the highest optical efficiencies achieved in a Tm-doped fiber amplifier operating in the 2-micron spectral region.

  10. Sabotage at Nuclear Power Plants

    Energy Technology Data Exchange (ETDEWEB)

    Purvis, James W.

    1999-07-21

    Recently there has been a noted worldwide increase in violent actions including attempted sabotage at nuclear power plants. Several organizations, such as the International Atomic Energy Agency and the US Nuclear Regulatory Commission, have guidelines, recommendations, and formal threat- and risk-assessment processes for the protection of nuclear assets. Other examples are the former Defense Special Weapons Agency, which used a risk-assessment model to evaluate force-protection security requirements for terrorist incidents at DOD military bases. The US DOE uses a graded approach to protect its assets based on risk and vulnerability assessments. The Federal Aviation Administration and Federal Bureau of Investigation conduct joint threat and vulnerability assessments on high-risk US airports. Several private companies under contract to government agencies use formal risk-assessment models and methods to identify security requirements. The purpose of this paper is to survey these methods and present an overview of all potential types of sabotage at nuclear power plants. The paper discusses emerging threats and current methods of choice for sabotage--especially vehicle bombs and chemical attacks. Potential consequences of sabotage acts, including economic and political; not just those that may result in unacceptable radiological exposure to the public, are also discussed. Applicability of risk-assessment methods and mitigation techniques are also presented.

  11. Performance analysis of a soil-based thermal energy storage system using solar-driven air-source heat pump for Danish buildings sector

    DEFF Research Database (Denmark)

    Jradi, M.; Veje, C.; Jørgensen, B. N.

    2017-01-01

    source. Employing a PV system of 30 kW capacity, it was found that a storage medium of 900 m3 of soil is capable of providing the heating needs for a housing project of 1000 m2 internal floor area. The year round transient behaviour of the thermal energy storage medium is reported in addition to the heat...... and evaluation of the performance of an underground soil-based thermal energy storage system for solar energy storage, coupled with a combined heat and power generation system. A combined PV-Air Source Heat Pump (ASHP) system is utilized to fulfil heating and electricity needs of a housing project in Odense.......2% for the combined PV-ASHP system employing a seasonal underground thermal energy storage block....

  12. Synthesis of Model Based Robust Stabilizing Reactor Power Controller for Nuclear Power Plant

    Directory of Open Access Journals (Sweden)

    Arshad Habib Malik

    2011-04-01

    Full Text Available In this paper, a nominal SISO (Single Input Single Output model of PHWR (Pressurized Heavy Water Reactor type nuclear power plant is developed based on normal moderator pump-up rate capturing the moderator level dynamics using system identification technique. As the plant model is not exact, therefore additive and multiplicative uncertainty modeling is required. A robust perturbed plant model is derived based on worst case model capturing slowest moderator pump-up rate dynamics and moderator control valve opening delay. Both nominal and worst case models of PHWR-type nuclear power plant have ARX (An Autoregressive Exogenous structures and the parameters of both models are estimated using recursive LMS (Least Mean Square optimization algorithm. Nominal and worst case discrete plant models are transformed into frequency domain for robust controller design purpose. The closed loop system is configured into two port model form and H? robust controller is synthesized. The H?controller is designed based on singular value loop shaping and desired magnitude of control input. The selection of desired disturbance attenuation factor and size of the largest anticipated multiplicative plant perturbation for loop shaping of H? robust controller form a constrained multi-objective optimization problem. The performance and robustness of the proposed controller is tested under transient condition of a nuclear power plant in Pakistan and found satisfactory.

  13. Efficiency of Modern Power Plants of Thermal Power Stations

    Directory of Open Access Journals (Sweden)

    B. V. Yakovlev

    2007-01-01

    Full Text Available The paper considers efficiency and prospects in development of different types of fossil-fuel power plants – gas turbine, steam turbine and combined (gas and steam cycles.The paper provides information on plant selection, fuel consumption, specific output cost. It describes main advantages of various power plants.

  14. Hybrid wind-power-distillation plant

    OpenAIRE

    Ninić Neven; Klarin Branko; Tolj Ivan

    2012-01-01

    This paper reports and elaborates on the idea of a solar distiller and an offshore wind power plant operating together. The subject under discussion is a single-stage solar distillation plant with vaporization, using adiabatic expansion in the gravitational field inside a wind power plant supporting column. This scheme divides investment costs for electric power and distillate production. In the region of the Adriatic Sea, all electric power produced could be “converted” to hydrogen usi...

  15. Hydrodynamic Analysis of the Flow in an Axial Rotor and Impeller for Large Storage Pump

    Science.gov (United States)

    Bosioc, A. I.; Muntean, S.; Draghici, I.; Anton, L. E.

    2016-11-01

    In hydropower systems among hydropower plants there are integrated pumping stations (PS). In order to ensure higher flow rate, the pumps have constructive differences besides regular. Consequently, the complex shape of the suction-elbow with symmetric inlet generates an unsteady flow which is ingested by impeller. These phenomena's also generate stronger unsteady flow conditions, such as stall, wakes, turbulence and pressure fluctuations, which affect the overall mechanical behaviour of the pump with vibration, noise and radial and axial forces on the rotor. Alternatively, an axial rotor can be installed in front of the impeller. In this case, the flow non-uniformity will be decreased and the static pressure will be increased at the impeller inlet. Consequently, the efficiency behaviour practically remains unchanged while the cavitational behaviour is improved. From the assembly between axial rotor and centrifugal impeller, the axial rotor usually works in cavitation and is often replaced. The paper investigates experimentally and numerically the comparison between pump impeller without and with axial rotor hydrodynamics taking into account the flow given by the symmetrical suction elbow. Full three-dimensional turbulent numerical investigation of the symmetrical suction elbow, with axial rotor and without, pump impeller and volute are performed. The hydrodynamic analysis confirms that once the axial rotor is mounted in front of the pump impeller increase the static pressure and the incidence angle is improved at the inlet of the pump impeller.

  16. Valuing hydrological forecasts for a pumped storage assisted hydro facility

    Science.gov (United States)

    Zhao, Guangzhi; Davison, Matt

    2009-07-01

    SummaryThis paper estimates the value of a perfectly accurate short-term hydrological forecast to the operator of a hydro electricity generating facility which can sell its power at time varying but predictable prices. The expected value of a less accurate forecast will be smaller. We assume a simple random model for water inflows and that the costs of operating the facility, including water charges, will be the same whether or not its operator has inflow forecasts. Thus, the improvement in value from better hydrological prediction results from the increased ability of the forecast using facility to sell its power at high prices. The value of the forecast is therefore the difference between the sales of a facility operated over some time horizon with a perfect forecast, and the sales of a similar facility operated over the same time horizon with similar water inflows which, though governed by the same random model, cannot be forecast. This paper shows that the value of the forecast is an increasing function of the inflow process variance and quantifies how much the value of this perfect forecast increases with the variance of the water inflow process. Because the lifetime of hydroelectric facilities is long, the small increase observed here can lead to an increase in the profitability of hydropower investments.

  17. New power-conditioning systems for superconducting magnetic energy storage

    Science.gov (United States)

    Han, Byung Moon

    1992-06-01

    This dissertation presents the development of new power-conditioning systems for superconducting magnetic energy storage (SMES), which can regulate fast and independently the active and reactive powers demanded in the ac network. Three new power-conditioning systems were developed through a systematic approach to match the requirements of the superconducting coil and the ac power network. Each of these new systems is composed of ten 100-MW modules connected in parallel to handle the large current through the superconducting coil. The first system, which was published in the IEEE Transactions on Energy Conversion, consists of line-commutated 24-pulse converter, a thyristor-switched tap-changing transformer, and a thyristor-switched capacitor bank. The second system, which was accepted for publication in the IEEE Transactions on Energy Conversion, consists of a 12-pulse GTO (gate turn-off thyristor) converter and a thyristor-switched tap-changing transformer. The third system, which was submitted to the International Journal of Energy System, consists of a dc chopper and a voltage-source PWM (pulse width modulation) converter. The operational concept of each new system is verified through mathematical analyses and computer simulations. The dynamic interaction of each new system with the ac network and the superconducting coil is analyzed using a simulation model with EMTP (electro-magnetic transients program). The analysis results prove that each new system is feasible and realizable. Each system can regulate the active and reactive powers of the utility network rapidly and independently, and each offer a significant reduction of the system rating by reducing the reactive power demand in the converter. Feasible design for each new system was introduced using a modular design approach based on the 1000 MW/5000 MWH plant, incorporating commercially available components and proven technologies.

  18. Intelligent Power Management of hybrid Wind/ Fuel Cell/ Energy Storage Power Generation System

    Directory of Open Access Journals (Sweden)

    A. Hajizadeh

    2013-12-01

    Full Text Available This paper presents an intelligent power management strategy for hybrid wind/ fuel cell/ energy storage power generation system. The dynamic models of wind turbine, fuel cell and energy storage have been used for simulation of hybrid power system. In order to design power flow control strategy, a fuzzy logic control has been implemented to manage the power between power sources. The optimal operation of the hybrid power system is a main goal of designing power management strategy. The hybrid power system is simulated in MATLAB/ SIMIULINK environment and different operating conditions have been considered to evaluate the response of power management strategy.

  19. Significance of the non-aceotropic binary refrigerants, when used in heat pumps and refrigeration plants

    Energy Technology Data Exchange (ETDEWEB)

    Jakobs, R. (Technische Univ. Hannover (Germany, F.R.). Abt. Kaeltetechnik); Kruse, H.

    1977-07-01

    For heat pumps, peak energy economy and heat control are important factors for a successful competition with the traditional heating methods. It is demonstrated that non-aceotropic refrigerant mixtures provide considerable advantages for heat pump applications. For this reason, it is proposed to give careful consideration to such mixtures when using heat pump installations. A pilot refrigeration plant designed for technical studies on the plant was mounted at the Technical University of Hannover (FRG). This plant is briefly described.

  20. Numerical Investigation of Stratified Thermal Storage Tank Applied in Adsorption Heat Pump Cycle

    OpenAIRE

    Taheri, Hadi

    2014-01-01

    With the aid of the TES (Thermal Energy Storage) in the adsorption heat pump cycle, the COP of the system can be improved. Different geometrical variations of the TES with stratification device, have been investigated numerically. Furthermore,The effective thermal conductivity has been analyzed. The simulation results of a reference CFD model have been compared with experimental results. Additionally, the porous medium impact on the mixing process and turbulence has been studied numerically.

  1. Project PAT (Pumps Working as Turbines)/IG (Induction Generators): a new concept for generation of electric power through micro scale hydroelectric power plants; Projeto BFT (Bombas Funcionado como Turbinas)/GI (Geradores de Inducao): um novo conceito para geracao de energia eletrica atraves de microcentrais hidreletricas

    Energy Technology Data Exchange (ETDEWEB)

    Viana, Augusto Nelson Carvalho [Universidade Federal de Itajuba (UNIFEI), Itajuba, MG (Brazil). Inst. de Recursos Naturais. Programa de Pos-graduacao em Engenharia da Energia; Medeiros, Daniel de Macedo; Ricardo, Mateus [Universidade Federal de Itajuba (UNIFEI), Itajuba, MG (Brazil). Inst. de Recursos Naturais], Emails: augusto@unifei.edu.br, macedo@unifei.edu.br, mathidr@yahoo.com.br

    2006-07-01

    The present work has as objective to present the main bases of 'PAT/IG Project', accomplished in Boa Esperanca Farm (Delfim Moreira - MG), by an accord between Itajuba's Federal University and Mines and Energy Ministry. In a moment that the look for sustainable development is the law in Brazil, low costs and environmental impact alternatives must be prioritized. By this way, the PAT/IG Project continuous the Viana's (1987) works, that developed all Brazilian theoretical bases for using Pumps Working as Turbine (PAT). Besides that, the application of induction motors operating as induction generators will be evaluated, as the velocity control system of the PAT/IG group will be developed. The existing Boa Esperanca Farm's micro power plant will be rebuild ed, to receive a new generating group formed for a PAT and a IG, that will be used as natural sized test workbench of Itajuba's Federal University. At the ending of the project, there will be enough subsidies to prove, in practice, the feasibility presented in laboratorial tests by PAT/IG groups as conventional turbines replacer in micro powerplants. (author)

  2. 建设蓄能电站解决风电消纳经济性分析%Economic Analysis on Constructing Storage Stations for Consuming Wind Power

    Institute of Scientific and Technical Information of China (English)

    靳亚东; 董化宏; 马登清

    2011-01-01

    用电市场对风电消纳能力不足已经成为制约风电发展的“瓶颈”,建设抽水蓄能电站被认为是水电缺乏地区调整电源结构、解决风电消纳能力问题的有效途径,但建设抽水蓄能电站解决风电消纳的经济性问题一直是个疑问,通过详细的方案测算认为在一定的条件下,电网企业或发电公司建设抽水蓄能电站解决风电消纳是经济可行的.%The capacity shortage of electricity market for consuming wind power has been regarded as the "bottleneck" of wind power development, and the construction of pumped-storage power stations has been also considered to be an effective way to adjust power source structure and solve wind power consumption for the areas without sufficient hydropower sources, but the economy of constructing pumped -storage power stations has been a question. The economy is analyzed for constructing pumped-storage power stations to consume wind power, and the case study shows that, in certain conditions, constructing pumped-storage power stations to consume wind power by power grid and generation enterprises is feasible in economy.

  3. Electric power processing, distribution, management and energy storage

    Science.gov (United States)

    Giudici, R. J.

    1980-01-01

    Power distribution subsystems are required for three elements of the SPS program: (1) orbiting satellite, (2) ground rectenna, and (3) Electric Orbiting Transfer Vehicle (EOTV). Power distribution subsystems receive electrical power from the energy conversion subsystem and provide the power busses rotary power transfer devices, switchgear, power processing, energy storage, and power management required to deliver control, high voltage plasma interactions, electric thruster interactions, and spacecraft charging of the SPS and the EOTV are also included as part of the power distribution subsystem design.

  4. Thermal power plant design and operation

    CERN Document Server

    Sarkar, Dipak

    2015-01-01

    Thermal Power Plant: Design and Operation deals with various aspects of a thermal power plant, providing a new dimension to the subject, with focus on operating practices and troubleshooting, as well as technology and design. Its author has a 40-long association with thermal power plants in design as well as field engineering, sharing his experience with professional engineers under various training capacities, such as training programs for graduate engineers and operating personnel. Thermal Power Plant presents practical content on coal-, gas-, oil-, peat- and biomass-fueled thermal power

  5. Nuclear power plant operation 2016. Pt. 1

    Energy Technology Data Exchange (ETDEWEB)

    Anon.

    2017-05-15

    A report is given on the operating results achieved in 2016, events important to plant safety, special and relevant repair, and retrofit measures from nuclear power plants in Germany. Reports about nuclear power plants in Belgium, Finland, the Netherlands, Switzerland, and Spain will be published in a further issue.

  6. SLUDGE TREATMENT PROJECT PHASE 1 SLUDGE STORAGE OPTIONS ASSESSMENT OF T PLANT VERSUS ALTERNATE STORAGE FACILITY

    Energy Technology Data Exchange (ETDEWEB)

    RUTHERFORD WW; GEUTHER WJ; STRANKMAN MR; CONRAD EA; RHOADARMER DD; BLACK DM; POTTMEYER JA

    2009-04-29

    The CH2M HILL Plateau Remediation Company (CHPRC) has recommended to the U.S. Department of Energy (DOE) a two phase approach for removal and storage (Phase 1) and treatment and packaging for offsite shipment (Phase 2) of the sludge currently stored within the 105-K West Basin. This two phased strategy enables early removal of sludge from the 105-K West Basin by 2015, allowing remediation of historical unplanned releases of waste and closure of the 100-K Area. In Phase 1, the sludge currently stored in the Engineered Containers and Settler Tanks within the 105-K West Basin will be transferred into sludge transport and storage containers (STSCs). The STSCs will be transported to an interim storage facility. In Phase 2, sludge will be processed (treated) to meet shipping and disposal requirements and the sludge will be packaged for final disposal at a geologic repository. The purpose of this study is to evaluate two alternatives for interim Phase 1 storage of K Basin sludge. The cost, schedule, and risks for sludge storage at a newly-constructed Alternate Storage Facility (ASF) are compared to those at T Plant, which has been used previously for sludge storage. Based on the results of the assessment, T Plant is recommended for Phase 1 interim storage of sludge. Key elements that support this recommendation are the following: (1) T Plant has a proven process for storing sludge; (2) T Plant storage can be implemented at a lower incremental cost than the ASF; and (3) T Plant storage has a more favorable schedule profile, which provides more float, than the ASF. Underpinning the recommendation of T Plant for sludge storage is the assumption that T Plant has a durable, extended mission independent of the K Basin sludge interim storage mission. If this assumption cannot be validated and the operating costs of T Plant are borne by the Sludge Treatment Project, the conclusions and recommendations of this study would change. The following decision-making strategy, which is

  7. Optimal combination of energy storages for prospective power supply systems based on Renewable Energy Sources

    CERN Document Server

    Weitemeyer, Stefan; Siemer, Lars; Agert, Carsten

    2016-01-01

    Prospective power supply systems based on Renewable Energy Sources require measures to balance power generation and load at all times. The utilisation of storage devices and backup power plants is widely suggested for this purpose, whereas the best combination is still to be found. In this work, we present a modelling approach to systematically study scenarios of future power supply systems with a high share of electricity originating from wind and solar resources. By considering backup as a subordinate source of electricity with energy-only costs, the approach is independent of the actual full-load hours of the backup power plants. Applying the approach to multi-year meteorological data for Germany, cost-optimised combinations of storage devices and backup power are identified. We find that even in scenarios with significant excess generation capacities there is a need for storage devices or backup power plants with discharging power on the same order as the average load to balance the system at all times. F...

  8. Emission trade can finance CO2-storage. Capture and storage of carbon dioxide in power plants; Emissiehandel kan CO2-opslag financieren. Opvang en opslag van kooldioxide bij energiecentrales

    Energy Technology Data Exchange (ETDEWEB)

    Cozijnsen, J.

    2007-10-15

    CO2 capture and storage (CCS) is referred to in all policy documents as the solution in the transition towards a sustainable energy system. The march of CCS is held up, however, by the fact that it is a costly technique. The European Commission and the Member States are in doubt: subsidize or oblige. According to the author this choice does not have to be made if better use is made of CO2 emission trading. [mk]. [Dutch] C02-opvang en opslag (CCS) staat vermeld in alle beleidsdocumenten als de oplossing in de transitie naar een duurzame energiehuishouding. De opmars van CCS wordt echter gestuit doordat het een dure techniek is. De Europese Commissie en lidstaten twijfelen: subsidieren of verplichten? Volgens de auteur hoeft die keuze niet gemaakt te worden als er beter gebruik wordt gemaakt van CO2-emissiehandel.

  9. Battery energy storage technologies

    Science.gov (United States)

    Anderson, Max D.; Carr, Dodd S.

    1993-03-01

    Battery energy storage systems, comprising lead-acid batteries, power conversion systems, and control systems, are used by three main groups: power generating utilities, power distributing utilities, and major power consumers (such as electric furnace foundries). The principal advantages of battery energy storage systems to generating utilities include load leveling, frequency control, spinning reserve, modular construction, convenient siting, no emissions, and investment deferral for new generation and transmission equipment. Power distributing utilities and major power consumers can avoid costly demand changes by discharging their batteries at peak periods and then recharging with lower cost off-peak power (say, at night). Battery energy storage systems are most cost effective when designed for discharge periods of less than 5 h; other systems (for example, pumped water storage) are better suited for longer discharges. It is estimated that by the year 2000 there will be a potential need for 4000 MW of battery energy storage. New construction of five plants totaling 100 MW is presently scheduled for completion by the Puerto Rico Electric Power Authority between 1992 and 1995.

  10. Day-Ahead Scheduling of a Photovoltaic Plant by the Energy Management of a Storage System

    DEFF Research Database (Denmark)

    Marinelli, Mattia; Sossan, Fabrizio; Isleifsson, Fridrik Rafn

    2013-01-01

    by a proper management of the storage. Due to forecast inaccuracies, the energy manager controls the storage in order to ensure that the plan for hourly energy production is respected, minimizing the storage itself usage. The experimental study is carried out in SYSLAB, a distributed power system test......The paper discusses and describes a system for energy management of a 10 kW PV plant coupled with a 15 kW - 190 kWh storage system. The overall idea is, by knowing the meteorological forecast for the next 24h, to dispatch the PV system and to be able to grant the scheduled hourly energy profile...... facility at DTU Risø Campus and part of PowerLabDK. Both the PV and the storage are connected to the local network and are fully controllable through the SCADA system. The control management and the models are implemented in Matlab-Simulink, which can be interfaced with SYSLAB....

  11. Mercury emissions from geothermal power plants.

    Science.gov (United States)

    Robertson, D E; Crecelius, E A; Fruchter, J S; Ludwick, J D

    1977-06-03

    Geothermal steam used for power production contains significant quantities of volatile mercury. Much of this mercury escapes to the atmosphere as elemental mercury vapor in cooling tower exhausts. Mercury emissions from geothermal power plants, on a per megawatt (electric) basis, are comparable to releases from coal-fired power plants.

  12. `Power storage system` dealing with leveling of electric power use; Denryoku riyo no heijunka ni kotaeru `denryoku chozo system`

    Energy Technology Data Exchange (ETDEWEB)

    Igarashi, M. [Meidensha Corp., Tokyo (Japan)

    1996-06-28

    An overview is given on the development situation of a Zn-Br battery as a power storage system. The system is aimed at storing excess power at night and supplying the on-load demand during daytime. The power storage technology requires a large output and capacity of MWh level, long term stability and durability, and cost as low as pumped storage power generation. Four kinds of batteries have been examined to cope with the conditions, in which development of Zn-Br batteries along with Na-S batteries is in progress towards practicability. As a power conversion method for this system, GTO has been employed for a large capacity unit and IGBT for a medium/small capacity unit. The reliability of the Zn-Br batteries against leakage was improved by laminating each cell by hot plate welding. The service life was improved by using a material with a high bromine resistance in place of the conventional electrode constituent material. Although the battery efficiency was influenced by each resistance of electrode, film and electrolytic solution, distance between electrodes, temperature, etc., these correlations were clarified so as to establish the simulation technology. At present, the system realizes 50kW and 40kWh/m{sup 3}. 1 ref., 8 figs.

  13. Optimal Operation of Energy Storage in Power Transmission and Distribution

    OpenAIRE

    2015-01-01

    In this thesis, we investigate optimal operation of energy storage units in power transmission and distribution grids. At transmission level, we investigate the problem where an investor-owned independently-operated energy storage system seeks to offer energy and ancillary services in the day-ahead and real-time markets. We specifically consider the case where a significant portion of the power generated in the grid is from renewable energy resources and there exists significant uncertainty i...

  14. Simulators predict power plant operation

    Energy Technology Data Exchange (ETDEWEB)

    Peltier, R.

    2002-07-01

    Mix the complexity of a new construction or major retrofit project with today's 'do more with less', a pinch of 'personnel inexperience,' and a dash of 'unintended consequences', and you have got a recipe for insomnia. Advanced simulation tools, however, can help you wring out your design train your operators before the first wire is terminated and just may be get a good night's rest. The article describes several examples of uses of simulation tools. Esscor recently completed a simulation project for a major US utility exploring the potential for furnace/duct implosion that could result from adding higher volumetric flow induced-draft fans and selective catalytic reduction to a 650-MW coal-fired plant. CAF Electronics Inc. provided a full-scope simulator for Alstom's KA24-1 combined-cycle power plant in Paris, France. Computational fluid dynamics (CFD) tools are being used by the Gas Technology Institute to simulate the performance of the next generation of pulverized coal combustors. 5 figs.

  15. 用于抽水蓄能电站大坝不稳定温度场仿真的水平分区异步长解法%A Method Using Different Time Steps in Different Horizontal Regions for Simulation of Unsteady Temperature Field of Pumped Storage Power Station Dam

    Institute of Scientific and Technical Information of China (English)

    孙伟; 何蕴龙; 王南; 熊堃

    2015-01-01

    Because of the cyclical fluctuation of the water level of the reservoir,the upstream boundary of the pumped storage power station(PSPS)dam would encounter alternate contact with water,gas and other different me-dia. The upstream dam boundary with this kind of characteristics is called the special boundary. These alternating boundary conditions have a big impact on the distribution of the temperature fieldof special boundary surface and its impact range,and cannot be ignored in the temperature simulation analysis. This paper proposes a method of solving unsteady temperature field of pumped storage power station dam with different time steps in different horizontal re-gions,and analyzes in detail the characteristics of special boundary and gives the formula derivation of the basic principle of the method with different time steps in different horizontal regions. The concept of equivalent heat transfer coefficient is also put forward to averagely and approximately consider thevariation of heat transfer coefficient when the surface concrete contacting with different media and the position of horizontal partitioning boundary is given as well. The method is used in the simulation analysis of unsteady temperature field of Hohhot PSPS reservoir dam. The results show that the proposed method is effective and provides the possibility of calculating the temperature stress field which is more complex and time-consuming. Finally,the paper tentatively discusses the problem of freezing and thawing at the special boundary in cold regions.%对于抽水蓄能电站(PSPS)的拦河大坝上游迎水面,由于水库水位周期性升降变化,会出现与水、气等不同介质接触的交替变化现象. 将具有这种现象的迎水坝面边界称之为特殊边界. 这种交替变化的边界条件对特殊边界表面及其影响范围内的温度场分布将产生较大的影响,在温度仿真分析中不能忽略. 提出了考虑特殊边界影响的抽水蓄能电站大坝

  16. Study on the Performance of a Ground Source Heat Pump System Assisted by Solar Thermal Storage

    Directory of Open Access Journals (Sweden)

    Yu Jin Nam

    2015-11-01

    Full Text Available A ground source heat pump system (GSHPS utilizes a relatively stable underground temperature to achieve energy-saving for heating and cooling in buildings. However, continuous long-term operation will reduce the soil temperature in winter, resulting in a decline in system performance. In this research, in order to improve the system performance of a GSHPS, a ground heat pump system integrated with solar thermal storage was developed. This solar-assisted ground heat pump system (SAGHPS can both maintain the balance of the soil temperature effectively and achieve higher system performance than the conventional system. In this paper, in order to examine the characteristics of the system, a dynamic simulation was conducted under various conditions. The results of our case study provide specific operation data such as heat exchange rate, heat source temperature, and heat pump COP. As a result, the heat pump COP of SAGHPS was 4.7%, 9.3% higher than that of the GSHPS.

  17. 火力发电厂水源热泵空调系统与传统空调系统的技术经济性比较%Technical and Economic Comparison between Water-Source Heat Pump Air-Conditioning System and Classical Air-Conditioning System in Fossil Fuel Power Plants

    Institute of Scientific and Technical Information of China (English)

    王明国; 毛永东; 卢柏春; 谢网度

    2013-01-01

    Water-source heat pump air-conditioning as an energy-efficient, environmentally friendly air-conditioning system is gained more attention, and has a broad development prospects. According to Huarun Lianyuan power plant project, this paper has discussed the advantages about water-source heat pump air-conditioning system through the theoretical and economic comparison. The Water source heat pump air-conditioning system has a broad application value.%  水源热泵空调作为一种高效节能,环保型的空调系统正日益受到人们的重视,有着广阔的发展前景。介绍了华润电力涟源坑口电厂工程,通过与传统空调系统的技术经济比较论述其优越性,具有推广应用的价值。

  18. Cost and size estimates for an electrochemical bulk energy storage concept

    Science.gov (United States)

    Warshay, M.; Wright, L. O.

    1975-01-01

    Preliminary capital cost and size estimates were made for an electrochemical bulk energy storage concept for a redox-flow-cell system. Preliminary calculations showed that the redox-flow-cell system has great promise as a bulk energy storage system for power load leveling. The size of the system was estimated to be less than 2 percent of the size of a comparable pumped hydroelectric storage plant.

  19. Power consumption of circulation pumps - Much too high; Viel zu gross

    Energy Technology Data Exchange (ETDEWEB)

    Nipkow, J.

    2010-07-01

    This short article takes a look at the European Union 'Ecodesign' directive and, in particular, the situation with respect to circulation pumps as used in heating systems. These pumps account for around three per cent of Swiss electricity consumption, or as the author quotes, is equivalent to the power consumption of all domestic refrigerators. The very low efficiency of older pumps is commented on and improvements in newer models are noted. The European guidelines on the energy-efficiency of these circulation pumps are looked at and the future effects on pump power consumption are discussed.

  20. Evaluation of a sulfur oxide chemical heat storage process for a steam solar electric plant

    Energy Technology Data Exchange (ETDEWEB)

    Dayan, J.; Lynn, S.; Foss, A.

    1979-07-01

    The purpose of this study was to develop and evaluate technically feasible process configurations for the use of the sulfur oxide system, 2 SO/sub 3/ reversible 2 SO/sub 2/ + O/sub 2/, in energy storage. The storage system is coupled with a conventional steam-cycle power plant. Heat for both the power plant and the storage system is supplied during sunlit hours by a field of heliostats focussed on a central solar receiver. When sunlight is not available, the storage system supplies the heat to operate the power plant. A technically feasible, relatively efficient configuration is proposed for incorporating this type of energy storage system into a solar power plant. Complete material and energy balances are presented for a base case that represents a middle range of expected operating conditions. Equipment sizes and costs were estimated for the base case to obtain an approximate value for the cost of the electricity that would be produced from such an installation. In addition, the sensitivity of the efficiency of the system to variations in design and operating conditions was determined for the most important parameters and design details. In the base case the solar tower receives heat at a net rate of 230 MW(t) for a period of eight hours. Daytime electricity is about 30 MW(e). Nighttime generation is at a rate of about 15 MW(e) for a period of sixteen hours. The overall efficiency of converting heat into electricity is about 26%. The total capital cost for the base case is estimated at about $68 million, of which about 67% is for the tower and heliostats, 11% is for the daytime power plant, and 22% is for the storage system. The average cost of the electricity produced for the base case is estimated to be about 11 cents/kW(e)-hr.