一种具有限流功能的电容型高压直流断路器  

A capacitive high voltage DC circuit breaker incorporating a current limiting function

作　　者：屠立忠[1] 祝智祥 洪岑岑 成彦甫 李涛 TU Lizhong;ZHU Zhixiang;HONG Cencen;CHENG Yanfu;LI Tao(Nanjing Institute of Technology,Nanjing 211167,China)

机构地区：[1]南京工程学院,南京211167

出　　处：《浙江电力》2024年第8期57-65,共9页Zhejiang Electric Power

基　　金：国家自然科学基金(61873120)。

摘　　要：直流断路器作为直流电网实现故障清除的重要设备之一,其性能的优劣将直接影响系统的安全稳定运行。针对目前大部分断路器不具备故障限流能力且成本较高这一问题,提出了一种具有限流功能的电容型高压直流断路器设计方案。利用电容的充放电特性实现限流电抗和避雷器的投切,能够显著降低故障电流峰值;将传统直流断路器中大规模全控器件IGBT(绝缘栅双极晶体管)用电容来替代,在实现断流功能的同时有效降低了成本。基于PSCAD/EMTDC仿真软件搭建单端等效模型并进行仿真验证,结果表明:相较于传统高压直流断路器,所提方案降低了故障电流峰值,缩短了故障隔离时间,具有较好的性能。DC circuit breakers,as one of the vital devices for fault clearance in DC power systems,significantly in⁃fluence the secure and stable operation of the system.Given the problem that most circuit breakers lack fault current limiting capability and are comparably expensive,this paper proposes a design for a capacitive high voltage DC cir⁃cuit breaker incorporating a current limiting function.By utilizing the charging and discharging characteristics of ca⁃pacitors,current limiting reactors and lightning arresters can be switched,significantly reducing the peak value of fault current.The extensively used IGBTs in conventional DC circuit breakers are replaced by capacitors,effectively reducing the cost while retaining the current cutout capability.A single-ended equivalent model is developed using PSCAD/EMTDC software,and simulation is conducted.The simulation results show that,compared with traditional high-voltage DC circuit breakers,the proposed scheme reduces the peak value of fault current and shortens the fault isolation time.It demonstrates pleasing performance.

关 键 词：混合式断路器 故障限流 拓扑结构 预充电 

分 类 号：TM561[电气工程—电器]