不对称短路故障下辐射状风电场电压稳定性分析方法  

Voltage Stability Analytical Method of Radial Wind Farms with Asymmetric Short-circuit Fault

作　　者：秦振涛 姚骏[1] 刘育明 陈诗玥 司萌 罗辞勇[1] QIN Zhentao;YAO Jun;LIU Yuming;CHEN Shiyue;SI Meng;LUO Ciyong(State Key Laboratory of Power Transmission Equipment&System Security and New Technology(Chongqing University),Chongqing 400044,China;Electric Power Research Institute of State Grid Chongqing Electric Power Company,Chongqing 401123,China)

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆市400044 [2]国网重庆市电力公司电力科学研究院,重庆市401123

出　　处：《电力系统自动化》2023年第10期76-83,共8页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(51977019);国网重庆市电力公司科技项目(522023220010)。

摘　　要：随着风电场规模的不断增大,电网不对称短路故障期间,风电场与电网之间的耦合作用不断增强,电压失稳风险增大。针对现有风电场接入电力系统技术规定,在电网发生不对称短路故障持续阶段,研究辐射状风电场的静态电压稳定性分析方法。建立了考虑多风电场与连接线路的阻抗模型,根据不对称故障时的动态无功支撑要求,对多风电场的电压稳定性进行分析,获得了风电场和电网正负序阻抗之间的电压相互作用关系。分析结果表明,多风电场满足现有风电并网导则时,所提方法可准确判断电网不对称短路故障持续阶段的静态电压是否稳定。最后,通过仿真验证了理论分析的正确性和所提方法的有效性。As the scale of wind farms increases,the coupling between wind farms and power grid is strengthened during asymmetric short-circuit fault in the grid,which may increase the risk of voltage instability.Aimed at the current technical specification for connecting wind farm to power system,the analysis method for static voltage stability of radial wind farms during the stage of asymmetric short-circuit fault in the grid is studied.The impedance model considering the coupling between multiple wind farms and connecting lines is established.According to the dynamic reactive power support requirements during the asymmetric fault,the voltage stability of wind farms is analyzed to obtain the voltage interaction between the positive and negative sequence impedances of wind farms and power grid.The analytical results show that the proposed method can accurately judge whether the static voltage is stable during the stage of asymmetric short-circuit fault in the grid when multiple wind farms satisfy the current guideline of wind power grid connection.Finally,the correctness of the theoretical analysis and effectiveness of the proposed method are verified by simulations.

关 键 词：风电场 短路故障 风电并网 动态无功功率 静态电压稳定性 

分 类 号：TM614[电气工程—电力系统及自动化] TM712