中国电机工程学报2017，Vol.37Issue(20)：6004-6013,10.DOI:10.13334/j.0258-8013.pcsee.171497
集成直流断路器功能的模块化多电平换流器
An MMC Topology Integrated With DC Circuit Breaker
摘要
Abstract
The DC fault blocking capability of modular multilevel converter (MMC) is a key issue for overhead line applications of voltage source converter based high voltage DC (VSC-HVDC) transmission system.An MMC integrated with DC circuit breaker (IDCB-MMC) was proposed.The IDCB-MMC employed submodules with double bypass thyristors.A fast mechanical switch and a commutation switch were series connected as the DC circuit breaker (DCB) part of IDCB-MMC.Through coordinating the operation of the converter part and DCB part,the DC fault current can be forced to transfer to the converter-side and line-side energy absorbing branches,respectively.Therefore,the bulky and costly transfer branch using semiconductor devices can be eliminated.The DC fault blocking capability of the IDCB-MMC was verified by the simulation results for one pole of a two-terminal 1000MW/±320kV MMC-HVDC system.Compared with conventional MMC using half-bridge submodules,the IDCB-MMC only requires minor additional capacitors and switching devices and an additional simple mechanical switch,resulting in the advantages such as low cost and low footprint requirements.The additional on-state loss of IDCB-MMC is far less than that of other MMC topologies with dc fault blocking capability.关键词
柔性直流输电/模块化多电平换流器/直流断路器/直流短路故障/直流故障阻断Key words
voltage source converter based high voltage DC (VSC-HVDC)/modular multilevel converter (MMC)/DC circuit breaker/DC short-circuit fault/DC fault blocking分类
信息技术与安全科学引用本文复制引用
宋强,杨文博,李笑倩,李建国,曾嵘,黄瑜珑,余占清,刘文华..集成直流断路器功能的模块化多电平换流器[J].中国电机工程学报,2017,37(20):6004-6013,10.基金项目
国家重点研发计划(2016YFB0901002) （2016YFB0901002）
国家电网公司科技项目(52100116003D).Project Supported by National Key R&D Program (2016YFB0901002) （52100116003D）
Science and Technology Foundation of the State Grid Corporation of China(52100116003D). （52100116003D）
