含双馈风电机组的电力系统故障计算方法研究  

The Fault Calculation Method of Power Systems Including Doubly-fed Induction Generators

作　　者：肖繁[1] 张哲[1] 尹项根[1] 杨航[1] 杨增力[2] 

机构地区：[1]强电磁与新技术国家重点实验室(华中科技大学),武汉430074 [2]国网湖北省电力公司,武汉430077

出　　处：《电工技术学报》2016年第1期14-23,共10页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51177058;51277084)资助项目

摘　　要：双馈风电机组馈出的短路电流特性极其复杂,传统以交流同步电机供电电源为基础的电网故障分析方法不能适用于含双馈电源的电网短路计算。根据双馈风电机组低压穿越运行的技术要求,在电网对称故障和不对称故障条件下,建立了计及其励磁调节特性影响的短路电流计算模型。在此基础上,基于对称分量法建立了含多双馈风电机组接入的电网各序等效电路,通过对电网电动势方程、故障边界条件方程和双馈风电机组短路计算模型方程进行迭代求解,计算电网各支路的故障电流和各节点电压。与算例的仿真结果对比表明,该短路电流计算方法计算准确度高,可较好地满足工程应用要求。The complex fault current characteristics of doubly-fed induction generators（ DFIGs） cause that the conventional fault analysis method based on AC synchronous generators is not applicable for the power systems containing DFIGs. According to the low voltage ride through（ LVRT） control strategy of the DFIGs,the shortcircuit calculation models of the DFIGs are established considering their excitation regulation characteristics for the three-phase fault or the unbalanced fault. Based on this, the sequence networks of the power systems containing DFIGs are proposed using the symmetrical component method. According to the nodal voltage equations, the fault boundary conditions equation, and the short-circuit calculation models of DFIGs, the branch currents and the node voltages are calculated based on an iterative algorithm. The simulation results show that the proposed method has a high accuracy of short-circuit current calculation and can meet the requirements of engineering applications.

关 键 词：双馈风电机组 短路计算 低电压穿越 等效模型 迭代计算 

分 类 号：TM74[电气工程—电力系统及自动化]