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| 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 |
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Abstract 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.
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Received: 09 March 2013
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