多端口电感耦合型高压直流限流断路器  

Multi-port Inductively Coupled HVDC Current Limiting Circuit Breaker

作　　者：李国庆[1] 王威儒 贺之渊 辛业春[1] 谷怀广 LI Guoqing;WANG Weiru;HE Zhiyuan;XIN Yechun;GU Huaiguang(School of Electrical Engineering,Northeast Electric Power University,Jilin 132012,Jilin Province,China;Global Energy Interconnection Research Institute Co.,Ltd.,Changping District,Beijing 102209,China)

机构地区：[1]东北电力大学电气工程学院,吉林省吉林市132012 [2]全球能源互联网研究院有限公司,北京市昌平区102209

出　　处：《电网技术》2020年第10期3866-3874,共9页Power System Technology

基　　金：国家自然科学基金资助项目(51677023)。

摘　　要：直流电网接地故障将引起换流器闭锁,进而扩大故障影响面积,配置直流限流器及直流断路器是解决上述问题的通用方案。运用了2组耦合电感,针对高压直流电网设计了多端口直流限流断路器。该设备包括初级限流器、故障隔离限流器、引流支路3个部分,其中前两者串联在同一直流母线的各条线路中,引流支路是各条直流线路所共用的部分。不同部分的开关器件通过相互配合、互相借用的方式来提高限流断路器的经济性。在PSCAD仿真软件上搭建了张北四端直流电网模型,并与其他几种已有方案进行了比较,结果表明文中所提出的限流断路器能够在6ms内完成电力电子器件相关动作,各开关组所受冲击电压较低,若将其应用于n端口直流母线,则仅需要(26n+502)个开关组,经济性较高。The grounding fault of DC power grid will lead to converter blockade,fault area expanding.The configuration of DC current limiter and DC circuit breaker is a general solution to the above problem.In this paper,a multi-port DC current limiting circuit breaker is designed for HVDC power grid with two sets of coupled inductors.This equipment consists of three parts:primary current limiter,fault isolation current limiter and drainage branch.The former two parts are connected in series in each line of the same DC bus,and the drainage branch is the common part of each DC line.The switching devices of the different parts can improve their economy by cooperating with each other and borrowing from each other.A model of Zhangbei four-terminal DC power grid is built on PSCAD simulation software and compared with several other existing schemes.The results show that the current limiting circuit breaker proposed in this paper can complete the relevant actions of power electronic devices within 6 ms with low impact voltage to each switch group.If it is applied to N-port DC bus,only(26 n+502)switch groups are needed,which has high economy.

关 键 词：多端口直流电网 耦合电感 限流断路器 经济性 

分 类 号：TM721[电气工程—电力系统及自动化]