中国电机工程学报2017，Vol.37Issue(z1)：21-29,9.DOI:10.13334/j.0258-8013.pcsee.170993
双极MMC-HVDC系统故障限流及换流器快速重启策略研究
Research on Fault Current Limiting and Fast Restart Strategy for the Bipolar MMC-HVDC System
摘要
Abstract
With the rapid development of the modular multilevel converter based HVDC system, the HVDC system with the long distance bulk power overhead line transmission appears. Compared with the cable line transmission, the overhead line is prone to happen short circuit faults such as flashover and other transient fault. Appropriate measures must be taken to limit the fault current and avoid system outage. In this paper, the equivalent circuit model was built to analyze the single-pole-to-earth fault characteristics form the AC system and the converter respectively. The math analytic expression of fault current was derived. A new fault current limiting module has been proposed, which effectively suppress the circuit current amplitude. According to the current limiting capability of the current limiting module, a fast converter restart strategy has been designed. The simulation results show that the current limiting scheme can effectively limit the fault current, eliminate the overcurrent hazard of the AC system and the free-wheeling diode inside the converter, reduce the operation difficulty of DC breaker, accelerate the restart of the fault pole converter, reduce the system outage time.关键词
模块化多电平换流器直流输电/真双极系统/架空线/故障限流/换流站重启Key words
modular multilevel converter based HVDC (MMC-HVDC)/double bipolar MMC-HVDC system/overhead line/fault limitation/converter restart分类
信息技术与安全科学引用本文复制引用
王江天,王兴国,马静,周泽昕..双极MMC-HVDC系统故障限流及换流器快速重启策略研究[J].中国电机工程学报,2017,37(z1):21-29,9.基金项目
国家电网公司科技项目(±500kV 柔性直流电网对交流电网保护影响研究).Science and Technology Project of State Grid Corporation of China. (Research on the Influence of ±500kV MMC-HVDC on AC Power Grid Protection) （±500kV 柔性直流电网对交流电网保护影响研究）
