基于综合电流幅值比的永磁直驱风力发电机送出线路纵联保护  

Pilot protection based on comprehensive current amplitude ratio for outgoing transmission line with permanent magnet synchronous wind power generator

作　　者：颜琬滢 段建东[1] 陈童 侯泽权 蒋劲轩 YAN Wanying;DUAN Jiandong;CHEN Tong;HOU Zequan;JIANG Jinxuan(Xi'an University of Technology,Xi'an 710048,China;State Grid Xianyang Electric Power Supply Company,Xianyang 712000,China)

机构地区：[1]西安理工大学,陕西西安710048 [2]国网咸阳供电公司,陕西咸阳712000

出　　处：《供用电》2023年第4期47-54,共8页Distribution & Utilization

基　　金：国家自然科学基金项目(51877174);国网陕西省电力有限公司科技项目(5226KY200079)。

摘　　要：随着能源转型不断深入,配电网结构向电力电子化的多端网络转变。受逆变器型电源控制策略的影响,接入高比例逆变器型电源的送出线路电流保护方法容易失效。依据永磁直驱风力发电机接入配电网的故障限流特性,研究了一种基于综合电流幅值比的风机送出线路纵联保护方法。根据被保护线路两侧电流故障前后的比值差异,提出了全电流幅值比判据;同时,为提高保护的耐过渡电阻能力,构建了负序电流幅值比判据。在不同故障场景下,通过PSCAD仿真,验证了所提方法的可行性。With the energy transition in progress,the distribution network structure is changing to a multi-terminal network with various power electronic equipment.Affected by the control strategy of inverter-interfaced distributed generators,the traditional current protection method of distribution network feeder is susceptible to failure after the high proportion of inverter-interfaced distributed generation is connected.Based on the fault current limiting characteristics of the permanent magnet direct-drive wind turbine connected to the distribution network,a pilot protection method based on comprehensive current amplitude ratio for outgoing transmission line with PMSG is studied.According to the ratio difference before and after the fault on both sides of the protected zone,the full current amplitude ratio criterion is proposed.And the negative sequence current amplitude ratio criterion is constructed to improve the ability of the protection to cover fault resistance.The feasibility of the proposed method is verified by PSCAD simulations under different fault scenarios.

关 键 词：逆变器型电源 永磁直驱风力发电机 限流特性 负序抑制 综合电流幅值比 

分 类 号：TM721[电气工程—电力系统及自动化]