一种新型限流式混合直流断路器拓扑  

A Novel Current-limiting Hybrid DC Circuit Breaker Topology

作　　者：薛士敏[1] 陈萧 刘白冰 陈硕[1] XUE Shimin;CHEN Xiao;LIU Baibing;CHEN Shuo(Key Laboratory of Smart Grid of Ministry of Education(Tianjin University),Nankai District,Tianjin 300072,China)

机构地区：[1]智能电网教育部重点实验室(天津大学),天津市南开区300072

出　　处：《中国电机工程学报》2022年第7期2508-2519,共12页Proceedings of the CSEE

基　　金：国家电网有限公司总部科技项目(KJ21-1-66)。

摘　　要：混合式直流断路器是柔性直流电网的重要组成部分,用于实现直流侧故障隔离,但现有拓扑大多不具备故障限流能力,且成本较高。对此,该文提出一种新型限流式混合直流断路器拓扑,其具备主模态、限流模态及断路模态3种工作模态,能够灵活应对直流电网不同异常状况。该拓扑主要采用晶闸管实现故障电流换路,大大减少IGBT的使用量以降低断路器成本,同时配合电容进行限流电感与避雷器的投切,以实现故障限流并提高分断速度。此外,该文针对所提出拓扑的工作过程进行详细解析和理论推导,基于PSCAD/EMTDC在单端等效和四端直流电网环境下进行仿真验证,并与现有典型拓扑进行对比分析,仿真结果证明了所提直流断路器拓扑的可行性和优越性。Hybrid DC circuit breaker(DCCB) is an important component of flexible DC grid, which is used to isolate DC side faults, but most of the existing topologies do not have fault current limiting capability and the cost is high. In this paper, a novel current-limiting hybrid DCCB topology was proposed, which had three working modes: main mode,current-limiting mode and circuit-breaking mode. And it could flexibly cope with different abnormal conditions of DC grid.This topology mainly used thyristors to realize fault current switching, which greatly reduced the use of IGBTs. At the same time, it cooperated with capacitors to realize the switching of current-limiting reactors and arresters to achieve fault current limiting and increase breaking speed. In addition, the working process of the proposed topology was analyzed and deduced in detail. Based on the PSCAD/EMTDC, the simulation was carried out in the single-terminal equivalent system and four-terminal DC grid, Compared with the existing typical topologies, the feasibility and superiority of the proposed DCCB topology can be proved.

关 键 词：柔性直流电网 混合式直流断路器 晶闸管 故障限流 多模态 

分 类 号：TM46[电气工程—电器]