适用于直流电网的多端口电容限流式直流断路器  

Multi-port Capacitor Current-Limiting DC Circuit Breaker for DC Grid

作　　者：王鹤[1] 曹占辉 罗汉松 沈冠冶 边竞[1] 胡倩慈 WANG He;CAO Zhanhui;LUO Hansong;SHEN Guanye;BIAN Jing;HU Qianci(Electrical Engineering College,Northeast Electric Power University,Jilin Jilin 132012;State Grid Jilin Electric Power Co.Ltd.,Changchun Power Supply Company,Changchun Jilin 130000)

机构地区：[1]东北电力大学电气工程学院,吉林吉林132012 [2]国网冀北电力有限公司秦皇岛供电公司,河北秦皇岛066000 [3]国网吉林省电力有限公司长春供电公司,吉林长春130000

出　　处：《东北电力大学学报》2022年第6期62-71,共10页Journal of Northeast Electric Power University

基　　金：国家自然科学基金项目(U2066208)。

摘　　要：混合式直流断路器是当前柔性直流系统最为理想的故障隔离方式,文中针对高压直流电网设计了一种多端口电容限流式直流断路器.首先,简要介绍ABB混合式直流断路器的拓扑结构和工作原理,在此基础上提出多端口电容限流式直流断路器的拓扑结构并详细论述了所提直流断路器的工作原理;其次,通过对不同时段下故障等效电路的分析,获得了直流断路器关键参数的设计方法;最后,在PSCAD/EMTDC仿真软件上搭建四端直流电网模型,分析验证了所提直流断路器的开断能力和限流效果,并与多种方案进行经济性比较,进一步验证所提直流断路器的优越性.结果表明本文所提多端口直流断路器能够在6.8 ms内切除故障,并且仅需538个IGBT元件,具备良好的开断、限流能力和经济性.Hybrid DC circuit breaker is the most ideal fault isolation method in flexible DC system.In this paper,a multi-port capacitor current-limiting DC circuit breaker is designed for high voltage DC power grid.Firstly,the topological structure and working principle of ABB hybrid DC circuit breaker are introduced briefly.Then,the topology of proposed multi-port capacitor current-limiting DC circuit breaker is given with its working principle discussed detailly.Afterwards,the design method of the key parameter of proposed DCCB is obtained by analyzing the fault equivalent circuit in different periods.Finally,a four-terminal DC power grid is built on PSCAD/EMTDC to analyze and verify the breaking capacity and current limiting effect of the proposed DCCB and the economic comparison with other DC circuit breaker schemes is carried out which further verified the advantages of the proposed DCCB.The results show that the multi-port DC circuit breaker proposed in this paper can complete fault removal within 6.8 ms and only 538 IGBTs are needed,which has good breaking ability,current-limiting capacity and economy.

关 键 词：柔性直流系统 直流断路器 混合式 多端口 电容限流 

分 类 号：TM76[电气工程—电力系统及自动化]