The Mechanism, Factors and Influence Rules of Voltage Imbalance in Wind Power Integration Areas
Liu Qihui1, Pang Simin1, Wu Linlin2, Liu Hui2, Xu Man2
1. Key Lab of Power Systems with Renewable Energy Sources North China Electric Power University Beijing 102206 China; 2. State Grid Jibei Electric Power Company Limited Research Institution Beijing 100045 China
Abstract：The centralized integration of wind power in China often shows the characteristics of weak grid structure, small local loads, and lack of local reactive power support, which easily leads to voltage unbalance. In severe cases, a large number of wind turbines can be disconnected from the grid, which can greatly impact the safe operation of the power grid. In order to analyze the forming mechanism of voltage unbalance in large-scale wind power integration area, firstly, the fundamental frequency negative-sequence (FFNS) impedance model of doubly-fed induction generator (DFIG) including grid side converter (GSC), rotor side converter (RSC) and phase locked loop (PLL) is established. In addition, the single machine FFNS impedance model is extended to the wind power cluster; Secondly, taking one actual wind power integration area as the research target, the negative sequence equivalent circuit of the wind power integration system is constructed, the voltage unbalance mechanism of the wind power integration area is proposed, and the main influencing factors from both source side and grid side, together with their affecting rules are analyzed in detail. Finally, based on the MATLAB/Simulink simulation platform, the validity of the mechanism analysis and influence law is verified.
刘其辉, 逄思敏, 吴林林, 刘辉, 徐曼. 大规模风电汇集系统电压不平衡机理、因素及影响规律[J]. 电工技术学报, 2022, 37(21): 5435-5450.
Liu Qihui, Pang Simin, Wu Linlin, Liu Hui, Xu Man. The Mechanism, Factors and Influence Rules of Voltage Imbalance in Wind Power Integration Areas. Transactions of China Electrotechnical Society, 2022, 37(21): 5435-5450.
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2022, Vol. 37 
