柔性直流配电网中机械式直流断路器动作时序对操作过电压的影响  

Effect of Mechanical DC Circuit Breaker Operation Timing Sequence on Operating Overvoltage in Flexible DC Distribution Network

作　　者：赵紫辉 杨昆 钱利宏 曹阳娜 史宗谦[2] ZHAO Zihui;YANG Kun;QIAN Lihong;CAO Yangna;SHI Zongqian(Zhuhai Power Supply Bureau,Guangdong Power Grid Corporation,Guangdong Zhuhai 519000,China;School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]广东电网有限责任公司珠海供电局,广东珠海519000 [2]西安交通大学电气工程学院,西安710049

出　　处：《高压电器》2024年第10期212-220,共9页High Voltage Apparatus

摘　　要：柔性直流配电网因其诸多优势成为未来配电网的重要组成部分,而直流断路器是构建柔性直流配电网的重要设备,但直流断路器动作时产生过电压危害系统的绝缘安全。文中基于Pscad/Emtdc建立±10 kV三端环网结构的柔性直流配电网仿真模型,对系统发生电缆侧双极短路故障、限流电抗器出口双极短路故障和单极接地故障时机械式直流断路器的开断策略和操作过电压特性进行理论和仿真分析,并研究线路两端机械式直流断路器动作时序对操作过电压的影响,最后对分析结果进行总结,文中的研究结果可为柔性直流配电网的保护策略和绝缘配合提供参考。Flexible DC distribution network has become an important part of future distribution network because of its many advantages.DC circuit breakers are important equipment in constructing flexible DC distribution network,whereas,the overvoltage generated during the operation of DC circuit breaker endangers the insulation safety of the system.This paper establishes a±10 kV three⁃terminal flexible DC distribution network in the Pscad/Emtdc platform,and carries out theoretical and simulation analysis of the breaking strategy and operating overvoltage of mechanical DC circuit breakers in the case of interrupting bipolar short⁃circuit fault on the cable side,bipolar short⁃circuit fault at the outlet of current⁃limiting reactor,and single⁃pole ground fault.Furthermore,the influence of operating timing sequence of mechanical DC circuit breakers at both ends of the line on operating overvoltage is investigated.Finally,the analysis results are summarized and the research in present work provides a reference for the protection strategy and insulation coordination of the flexible DC distribution network.

关 键 词：柔性直流配电网 机械式直流断路器 操作过电压 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM561