基于双曲正切函数动作特性的风电场集电线路反时限保护方法  

A Hyperbolic Tangent Function Operation Characteristic Based Inverse-time Protection Method of Wind Farm Collector Line

作　　者：喻锟[1] 林湘宁[1] 童宁[1] 李浩[1] 赵航[1] 李正天[1] 张锐 YU Kun;LIN Xiangning;TONG Ning;LI Hao;ZHAO Hang;LI Zhengtian;ZHANG Rui(State Key Laboratory of Electromagnetic Engineering（Huazhong University of Science and Technology）,Wuhan 430074,Hubei Province,China;State Power Economic Research Institute,Changping District,Beijing 102211,China)

机构地区：[1]强电磁工程与新技术国家重点实验室(华中科技大学),湖北省武汉市430074 [2]国网经济技术研究院有限公司,北京市昌平区102211

出　　处：《中国电机工程学报》2018年第13期3846-3857,共12页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51577077);国家电网公司科技项目(SGTYHT/16-JS-198)~~

摘　　要：为解决风电场集电线路保护存在的选择性失配与速动性弱化问题,分析风电场集电线路保护与箱变熔断器间的动作配合策略,理论推导双馈异步风电机（doubly-fed induction generator,DFIG）故障电流稳态工频交流分量幅值随电压跌落程度与Crowbar阻值的变化规律,揭示集电线路保护发生选择性失配的机理与速动性弱化的原因。提出一种基于双曲正切函数动作特性的风电场集电线路反时限保护方法,实现风机箱变熔断器与集电线路保护之间的反时限动作特性配合。利用PSCAD/EMTDC搭建含DFIG的规模化风电场模型模拟多种故障条件对集电线路反时限保护方法进行验证,仿真结果表明该方法能够全面优化熔断器与集电线路保护的配合特性,解决不同集电线路保护之间的选择性失配难题,同时大幅提升动作域内集电线路保护的速动性能。To solve the discoordination and the weaken speed problem of collector line protection in wind farm, the coordination strategy of collector line protection and prefabricated transformer fuse was analyzed. The characteristics of doubly-fed induction generator（DFIG） fault current steady state power frequency component amplitude with the changing of the voltage sags and crowbar resistance was derive theoretically. The mechanism of the discoordination of collector line protection and the reason of the weaken speed were revealed. A hyperbolic tangent function operation characteristic based inverse-time protection method for collector line and the inverse-time characteristic based coordination of collector line protection and prefabricated transformer fuse were proposed. A large scale wind farm model containing DFIG was established in PSCAD/EMTDC. The simulation results show that this method can fully optimize the fuse and integrated circuit protection coordination characteristics, solve the selectivity between different sets of power line protection mismatch problem, and significantly enhance the action domain integrated circuit protection quick performance

关 键 词：风电场 集电线路 反时限保护 双曲正切函数 

分 类 号：TM77[电气工程—电力系统及自动化]