Effect of the Coupling Between Hydraulic Turbine Set and Power Grid on Power Grid Dynamic Stability
Han Zhiyong1, 2, Xu Yanhui1, Xin Jianbo3, He Renmu1, Bo Bo1
1. Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University, Ministry of Education Beijing 102206 China 2. China Electric Power Research Institute Beijing 100192 China 3. Jiangxi Provincial Electric Power Research Institute Nanchang 330200 China
Abstract：Low frequency ocillation phenomenon in which the hydraulic turbine sets participate occurred on power system many times. They have unknown mechanism, which has seriously affected the security and stability operation of power grid. In this paper, taking the Zhelin hydropower plant of Jiangxi Power Grid as the example, the states of water tail pressure pulsation and the influences for the output mechanical power are analyzed firstly. Then the hydraulic turbine set model considering the water tail pressure dynamic is established based on the physical characteristics of the draft tube hydraulic system. The effect of water tail pressure pulsation on the power grid dynamic security and stability is studied and the coupling between the hydraulic turbine set and power grid was investigated. The simulation results indicate that power oscillation in power grid might be caused by the water tail pressure pulsation because of resonance, when the water pressure pulse frequency is consistent with or close to power system natural oscillation frequency. Power oscillation causes the dynamic instability of power grid. The conclusion can provide reference to research into the causes of power system low frequency oscillations.
韩志勇, 徐衍会, 辛建波, 贺仁睦, 薄博. 水轮机组与电网耦合对电网动态稳定的影响[J]. 电工技术学报, 2009, 24(9): 166-170.
Han Zhiyong, Xu Yanhui, Xin Jianbo, He Renmu, Bo Bo. Effect of the Coupling Between Hydraulic Turbine Set and Power Grid on Power Grid Dynamic Stability. Transactions of China Electrotechnical Society, 2009, 24(9): 166-170.
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2009, Vol. 24 
