一种具有重合闸功能的限流式直流断路器

Current Limiting High Voltage DC Circuit Breaker with Re-closing Function

为提高柔性直流输电系统发生短路故障后高压直流断路器的故障隔离、限流及重合闸恢复能力,在现有直流断路器结构基础上提出一种具有重合闸功能的限流式直流断路器(RCL-HDCB)。RCL-HDCB方案改进了断路器的限流支路,使其能够快速重合闸,依据动作过程及原理进行了参数设计,在PSCAD/EMTDC仿真软件中搭建了基于模块化多电平换流器(modular multilevel converter,MMC)的双端直流输电系统,对RCLHDCB的运行状态进行仿真验证,结果表明该设备在发生短路故障后能够快速有效开断,故障电流也得到了较好的抑制,同时重合闸运行稳定,因此该RCL-HDCB方案对柔直输电系统具有一定的指导意义。

In order to improve the fault isolation,current limiting and re-closing operation recovery ability of high voltage DC(HVDC)circuit breaker after the short circuit fault in flexible HVDC transmission system,a kind of HVDC circuit breaker with re-closing function(RCL-HDCB)is proposed based on the structural base of existing DC circuit breaker.The current limiting branch of circuit breaker is improved by the RCL-HDCB proposal,which can make it quickly for re-closing operation.The parameters are designed by the operation process and principle and,based on PSCAD/EMTDC simulation software,the dual-terminal DC transmission system by modular Multilevel Converter(MMC)is set up to simulate and verify the operating state of RCL-HDCB.The results show that the device can quickly and effectively break after short circuit fault,the fault current is suppressed better and,at the same time,the re-closing operation is stable.Therefore,the RCL-HDCB proposal has certain guiding significance for the flexible HVDC transmission system.