适应于基于MMC的直流配电网极间故障保护控制策略  

Inter Pole Fault Protection Control Strategy for DC Distribution Network Based on MMC

作　　者：李辉 陈琦[1,2] 吴海 胡国 鲍柏舟[1,2] LI Hui;CHEN Qi;WU Hai;HU Guo;BAO Baizhou(NARI Group Corporation(State Grid Electric Power Research Institute),Nanjing 211106,China;NARI Technology Development Co.,Ltd.,Nanjing 211106,China)

机构地区：[1]南瑞集团有限公司(国网电力科学研究院有限公司),江苏南京211106 [2]国电南瑞科技股份有限公司,江苏南京211106

出　　处：《电工技术》2022年第12期66-70,共5页Electric Engineering

基　　金：“双碳”目标下的微电网与直流配电网实时监测控制关键技术及终端研制(编号524609220013)。

摘　　要：对模块化多电平换流器(Modular Multilevel Converter,MMC)直流极间故障的动态特性进行了较详细的分析,并提出基于电流变化率的保护控制启动,通过电流的变化率检测投入电阻限流器实现直流双极短路无闭锁故障穿越,由直流断路器切断故障电流的保护控制策略。该方法是在故障电流识别之前,即加入限流设备,超前于故障识别的主动限流控制方法。最后使用实时仿真系统(RTDS)搭建单端柔性直流配电网模型,仿真结果验证了该保护控制策略在极间故障情况下的有效性和准确性。In this paper,the dynamic characteristics of DC inter pole fault of modular multilevel converter(MMC)are analyzed in detail,and a protection control startup based on current change rate is proposed.Through the detection of the change rate of current,the resistance current limiter is input to realize the DC bipolar short-circuit non-blocking fault crossing,and the protection control strategy of cutting off the fault current by the DC circuit breaker.This method is an active current limiting control method that adds current limiting equipment before fault current identification.Finally,a single ended flexible DC distribution network model is built by using real-time simulation system(RTDS).The simulation results verify the effectiveness and accuracy of the protection control strategy in the case of inter pole fault.

关 键 词：模块化多电平换流器 直流极间故障 故障穿越 电阻限流 无闭锁控制 主动限流控制 

分 类 号：TM721[电气工程—电力系统及自动化]