具备自适应重合闸能力的多端口混合式直流断路器  

Multi-port Hybrid DC Circuit Breaker with Adaptive Reclosing Capability

作　　者：陈晓龙[1] 冯永涛 周宁[1] 韩小文 李永丽[1] 李斌[1] CHEN Xiaolong;FENG Yongtao;ZHOU Ning;HAN Xiaowen;LI Yongli;LI Bin(Key Laboratory of Smart Grid of Ministry of Education,Tianjin University,Tianjin 300072,China;Chengxi Electric Power Supply Branch,State Grid Tianjin Electric Power Company,Tianjin 300190,China)

机构地区：[1]天津大学智能电网教育部重点实验室,天津300072 [2]国网天津市电力公司城西供电分公司,天津300190

出　　处：《高电压技术》2024年第6期2601-2613,I0010-I0014,共18页High Voltage Engineering

基　　金：国家自然科学基金委员会-国家电网公司智能电网联合基金(U2066210)。

摘　　要：为解决柔性直流电网中混合式直流断路器成本高以及盲目重合闸的问题,提出了一种具备自适应重合闸能力的多端口混合式直流断路器。所提断路器能够在能量耗散期间旁路故障线路中的限流电抗器,配合电容充电回路的导通,将本应经避雷器耗散的限流电抗器能量转移到电容中,从而有效减少了故障隔离时间与避雷器能量耗散压力,并为故障性质的判别提供了能量支持。同时,该断路器通过共享主断路器的方式实现故障隔离,结合避雷器泄能需求的下降,大大降低了断路器的制造成本,在经济性方面优势明显。此外,该断路器利用故障识别电流与电容电压在永久性故障与瞬时性故障下的幅值差异来识别故障性质,实现了自适应重合闸,操作简单且易于控制。最后,利用PSCAD/EMTDC在三端MMC柔性直流系统环境下对所提方案的有效性进行了仿真验证,并通过与其他方案的对比分析,证明了所提方案的优越性。To tackle the issues of costly and unselective reclosing of hybrid DC circuit breakers in flexible DC grids,this paper proposes a multi-port hybrid DC circuit breaker with adaptive reclosing capability.The proposed circuit breaker can bypass the current-limiting reactor in the fault line during energy dissipation,working with the capacitor charging circuit.The circuit breaker transfers the energy,which is initially meant for dissipation through the arrester,to the capacitor.This effectively reduces the fault isolation time and the energy dissipation pressure on the arrester,while also providing energy support for fault nature identification.Moreover,this circuit breaker achieves fault isolation by sharing the main circuit breaker.Combined with the reduction in energy discharge requirements of the arrester,the manufacturing cost can be greatly reduced,having obvious economic advantages.Additionally,the circuit breaker utilizes the amplitude difference in fault identification current and capacitor voltage between permanent and transient faults to identify the fault nature,enabling adaptive reclosing,thus making it simple and easy to control.Finally,the effectiveness of the proposed scheme is simulated and verified using PSCAD/EMTDC in the environment of a three-terminal flexible DC system,and its superiority is proved through comparative analysis with other schemes.

关 键 词：柔性直流电网 多端口混合式直流断路器 直流故障隔离 经济性 自适应重合闸 

分 类 号：TM561[电气工程—电器]