电力系统自动化2016，Vol.40Issue(21)：20-26,7.DOI:10.7500/AEPS20160727007
模块化多电平换流器子模块故障时中性点移位容错控制策略
Fault-tolerant Control Strategy of Neutral Point Shift for Sub-module Faults of Modular Multilevel Converters
摘要
Abstract
After the occurrence of fault with sub-modules of modular multilevel converter (MMC),the fault-phase voltage output capacity will be changed since the changed number of sub-modules of the fault bridge,which will make the system neutral point shift.For the fault-tolerant control problem following the sub-module fault of MMC,this paper proposes a fault-tolerant control strategy based on neutral point shift control (NPSC) to ensure the line-to-line voltage of the system symmetrical output.It controls the neutral point shift in the fault phase by correcting each phase modulation wave after the fault.It can complete the sub-module fault ride-through while reducing the complexity of the traditional neutral-offset control algorithm at the same time.The influence of MMC system operating characteristic under the NPSC fault-tolerant control is analyzed,and the distribution characteristics of fundamental frequency component and direct current component of bridge current are pointed out.Finally,simulation and experiment results verify the feasibility of the theoretical analysis and the proposed scheme.关键词
模块化多电平换流器(MMC)/中性点移位控制(NPSC)/子模块/容错控制Key words
modular multilevel converter (MMC)/neutral point shift control (NPSC)/sub-module/fault-tolerant control引用本文复制引用
武文,吴学智,荆龙,李金科,王帅,王小星..模块化多电平换流器子模块故障时中性点移位容错控制策略[J].电力系统自动化,2016,40(21):20-26,7.基金项目
国家能源应用技术研究及工程示范项目(NY20150302)。@@@@This work is supported by Application Technology Research and Engineering Demonstration Program of National Energy of China(No.NY20150302) （NY20150302）
