计及低穿控制的混合型风电场短路电流特性与故障分析方法研究  

Study on Short-circuit Current and Fault Analysis Method of Hybrid Wind Farm with Low Voltage Ride-through Control Strategy

作　　者：尹俊 毕天姝 薛安成 杨奇逊 

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京102206

出　　处：《电工技术学报》2015年第21期99-110,共12页Transactions of China Electrotechnical Society

基　　金：国家重点基础研究发展(973)计划(2012CB215206)资助项目

摘　　要：不精确的短路电流计算会影响故障分析的结果,进而使保护动作特性的评估产生误差。针对以往研究中未考虑风电场中风机类型多样性、无法准确等效风电场的故障暂态过程等问题,考虑了故障期间控制策略对风力发电机组暂态过程的影响,建立了双馈风力发电机组与永磁风力发电机组的单机等效模型,采用分群聚合等效的方法,提出了含多类型风力发电机组的风电场简化等效模型。进一步分析了故障期间短路电流的变化机理,给出了混合型风电场的短路电流计算方法。采用实时数字仿真器(RTDS)建立含多类型风机的物理实验平台,验证了所提风电场短路电流计算方法的准确性,并在此基础上对风电场接入的电网故障分析方法进行了探讨与分析。The result of the fault analysis and the evaluation of protection action characteristic would be affected by imprecise short-circuit current calculations. The previous studies did not consider the type diversity of the wind turbines and eouldn＇ t accurately describe the fault transient process of the wind farm. In this paper, the influence of the control strategy to the fault transient process is considered. The equivalent models of the doubly- fed induction generator （DFIG） and the permanent magnet synchronous generator （PMSG） are established. By the aggregation equivalent method, the wind farm equivalent model with multi-type wind turbines is put forward. Then the change law of the short circuit current during the fault is analyzed and the short-circuit current calculation method of the hybrid wind farm is given. Based on RTDS （ real time digital simulator） the experiment platform with multi-type wind turbines is set up and the proposed short-circuit current calculation method is validated. Moreover the fault analysis method of the power grid with wind farm is analyzed.

关 键 词：风电场 双馈风力发电机组 永磁风力发电机组 短路电流计算 故障分析 

分 类 号：TM711[电气工程—电力系统及自动化]