Startup process of pumped-storage units in hybrid power system
Ren Yan1, Zhou Bing2, Zheng Yuan3, Deng Congxiang4
1.Institute of Electric Power, North China University of Water Resources and Electric Power, Zhengzhou, Henan 450045, China; 2.Patent Examination Cooperation Center of the Patent Office, SIPO, Beijing 100091, China; 3.College of Energy and Electrical Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 4.Xiaolangdi Multipurpose Dam Project Management Center, Ministry of Water Resources, Zhengzhou, Henan 450000, China
For a hybrid power system with pumped-storage units, a reversible pump-turbine can be served as the energy storage unit, in that case effects of transient characteristic of the pump-turbine on operating performance of the hybrid power system should be investigated during startup period either in turbine or pump mode. In doing so, a mathematic model was established for the startup process of the reversible pump-turbine in a hybrid power system based on the transient characteristics of pump-storage unit and the performance of the pump-turbine. In the turbine mode, the startup process has been divided into three states(zero, no-load state, and end of start process)and two periods(one is between zero and no-load state, the other is between no-load state and end of start process). In the no-load state, the wicket gate opening and flow rate were decided by using the runaway characteristic curves or the head curves of the pump-turbine. In the pump mode, the characteristics of the pump-turbine were analyzed under the limit of shaft-power at shut-off point. It was shown that the wicket gate opening and flow rate at the no-load state in the turbine mode could be determined by means of the runaway characteristic curve or head curve of the unit. In the pump mode, the unit couldn′t be put into operations until the net load was equal or larger than the shaft-power at shut-off point. Once the startup process was finished, however, whether the net load was more than or equal to the rated power or not, the unit could operate at the rated condition whatever the mode was. If the net load was less than the rated power, then the output power of the unit was the net load.
REN Yan-,ZHOU Bing-,ZHENG Yuan- et al. Startup process of pumped-storage units in hybrid power system[J]. Journal of Drainage and Irrigation Machinery Engin, 2014, 32(1): 40-44.
Qian Zhijun, Abdel-Rahman Osama, Hamilton Christopher, et al. An integrated four-port converter for compact and efficient hybrid power systems[C]//Procee-dings of ISCAS 2010—2010 IEEE International Symposium on Circuits and Systems: Nano-Bio Circuit Fabrics and Systems, 2010:2207-2210.
Anagnostopoulos J S, Papantonis D E. Simulation and size optimization of a pumped-storage power plant for the recovery of wind-farms rejected energy[J]. Renewable Energy, 2008, 33(7): 1685-1694.
Kong Yigang, Xu Dalin, Gu Zhaodan, et al. Analysis and caculation of variable pitch load for horizontal axis wind turbine[J]. Journal of Jiangsu University: Natural Science Edition, 2010, 31(6):635-639.(in Chinese)
Liao Zhiling, Liu Guohai, Mei Congli. An improved non-linear engineering mathematical model for silicon solar cell[J]. Journal of Jiangsu University: Natural Science Edition, 2010,31(4):442-446.(in Chinese)
Ren Yan, Zheng Yuan, Zhou Bing, et al. Model and operation strategy of pumped-storage in hybrid power system[J].Journal of Drainage and Irrigation Machinery Engineering, 2013, 31(2): 137-141.(in Chinese)
Islam S M. Increasing wind energy penetration level using pumped hydro storage in island micro-grid system[J]. International Journal of Energy and Environmental Engineering, 2012, 3(1): 1-12.
Gollmer R, Nowak M P, Römisch W, et al. Unit commitment in power generation—a basic model and some extensions[J]. Annals of Operations Research, 2000,96(1/2/3/4):167-189.
Zhang Lanjin, Wang Zhengwei, Chang Jinshi. Flow of pump-turbine on S-shaped region of complete characteristics[J]. Transactions of the Chinese Society for Agricultural Machinery, 2011, 42(1): 39-43,73.(in Chinese)
Van Alphen Klaas, Van Sark Wilfried G J H M, Hekkert M P. Renewable energy technologies in the Maldives-determining the potential[J]. Renewable and Sustainable Energy Reviews, 2007,11(8):1650-1674.
Diaf S, Diaf D, Belhamel M, et al. A methodology for optimal sizing of autonomous hybrid PV/wind system[J]. Energy Policy, 2007,35(11):5708-5718.
Manolakos D, Papadakis G, Papantonis D, et al. A simulation-optimisation programme for designing hybrid energy systems for supplying electricity and fresh water through desalination to remote areas—Ease study: The Merssini village, Donoussa island, Aegean Sea, Greece[J]. Energy, 2001,26(7):679-704.