Influence Mechanism and Law of Source-Side Factors on Voltage Unbalance in Wind Power Gathering Network

Wu Linlin, Liang Yunhong, Wang Xiao, Chen Can, Xu Man, Sun Dawei
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Abstract

As the penetration of new energy sources continues to increase, three-phase voltage unbalance frequently occurs in the centralized wind power integration systems in China, which threatens the stability and safety of wind turbines and power system. In order to analyze the influence mechanism and law of the source-side factors on the system voltage unbalance, this paper establishes the fundamental frequency negative sequence (FFNS) impedance models of doubly-fed induction generator (DFIG), wind farm and wind power cluster. A negative sequence equivalent circuit diagram, based on the actual network topology of wind power gathering system in North China, is derived, and the mechanism of voltage unbalance and the law of influence of source-side factors are analyzed. The mechanism and the impact law are verified based on
风电集网源侧因素对电压不平衡的影响机理及规律
随着新能源的不断普及,中国集中式风电集成系统中三相电压不平衡现象频繁发生,威胁着风电机组和电力系统的稳定与安全。为了分析源侧因素对系统电压不平衡的影响机理和规律,建立了双馈感应发电机(DFIG)、风电场和风电集群的基频负序(FFNS)阻抗模型。根据华北风电集电系统的实际网络拓扑,导出了负序等效电路图,分析了电压不平衡的机理和源侧因素的影响规律。在此基础上验证了其机理和冲击规律
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