Coordinated regulation of ball valves in pumped storage power stations for extreme conditions
HUANG Wei1,2, YANG Kailin2, GUO Xinlei2, MA Jiming3, LI Jiazhen2
1. School of Civil Engineering and Architecture, Nanchang University, Nanchang 330031, China; 2. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China; 3. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China
Abstract：For some pumped storage power stations, the maximum pressures at the spiral case inlet and the draft tube inlet cannot be limited to their allowable ranges by simply optimizing the guide vane closing law for extreme conditions. This paper presents a control strategy using coordinated regulation of the intake ball valve and the guide vane for such cases. A one-dimensional simulation is used to analyze the influence of the guide vane closing law, pump-turbine characteristics and ball valve closing law on the pump-turbine rotational speed and the pressures at the spiral case inlet and the draft tube inlet. A case study shows that this cooperative control mode has little effect on the first stage of the speed and the pressures at the ball valve inlet and the draft tube inlet, but significantly reduces the secondary peaks in the speed and ball valve inlet pressure and improves the second minimum draft tube inlet pressure. Moreover, this control mode also effectively prevents the units from entering the "S" shaped unstable area for small guide vane openings, so the system reduces the water hammer and pressure pulsations in pumped storage power stations.
黄伟, 杨开林, 郭新蕾, 马吉明, 李甲振. 抽水蓄能电站极端甩负荷工况球阀协同调节[J]. 清华大学学报（自然科学版）, 2019, 59(8): 635-644.
HUANG Wei, YANG Kailin, GUO Xinlei, MA Jiming, LI Jiazhen. Coordinated regulation of ball valves in pumped storage power stations for extreme conditions. Journal of Tsinghua University(Science and Technology), 2019, 59(8): 635-644.
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2019, Vol. 59 
