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| Most unfavorable interval time point of successive load shedding conditions |
| CHU Shanpeng1,ZHANG Jian2,HE Wei3* |
| 1. Zhejiang Flood Protection Technology Center, Hangzhou, Zhejiang 310000, China; 2. College of Water Conservancy and Hydropo-wer Engineering, Hohai University, Nanjing, Jiangsu 210000, China; 3. Zhejiang Design Institute of Water Conservancy and Hydro-electric Power Co., Ltd., Hangzhou, Zhejiang 310000, China |
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Abstract Based on the hydrodynamic and turbine momentum equation of water delivery system in pumped storage power stations with layout of two turbines sharing one main tunnel, the analytical formula for minimum pressure at draft tube inlet of the first rejection turbine was derived. Based on the formula, the most unfavorable interval time of minimum pressure at draft tube inlet in successive load shedding was analyzed and speculated. At the same time, based on the theory of transient flow theory and method of characteristics, numerical simulation calculation of transition process in the engineering example was carried out, which verified the correctness of the analysis and speculation. The results show that the track point of minimum pressure at draft tube inlet is very close to and above the low bending point of inverse S-curve whether in simultaneous or successive load shedding. When minimum pressure at draft tube inlet is in the first rejection turbine, the most unfavorable interval time for it in successive load shedding is in first Zone Ⅱ of the first rejection turbine′s running track. This conclusion provides a reference for the calculation of the minimum inlet pressure of the draft tube of the pumped storage power station unit and the selection of control conditions.
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Received: 20 March 2022
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