Active power oscillation suppression method of large hydropower unit with damping sil
ZHANG Haiku1,2, CHEN Qijuan1, ZHENG Yang1, GENG Qinghua2,3, WANG Liang2
1.School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China;
2.Datang Hydropower Science & Technology Research Institute Co., Ltd., Chengdu 610074, China;
3.College of Water Conservancy & Hydropower, Sichuan University, Chengdu 610065, China
Abstract：The stability of power system is related to the security of power grid.Here, based on the principle of adding non-pressure open channel being able to increase hydraulic damping, taking a large hydropower unit as the study object, aiming at the problem of active power oscillation caused by pressure fluctuation in tailrace channel, the damping trapezoidal sill model was established.The standard k-ε model and VOF multiphase flow model were adopted, and the software FLUENT was used to do simulation calculation, and the simulation results were applied in the large hydropower unit.The field tests and analysis were performed.The results showed that the proposed suppression method can significantly reduce amplitude of active power oscillation, and meet requirements of power grid for stable operation of large hydropower unit; the study results have engineering guiding value to solve the active power oscillation problem in power system.
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