南方电网技术2016，Vol.10Issue(11)：1-8,8.DOI:10.13648/j.cnki.issn1674-0629.2016.11.001
模块化多电平换流器桥臂不平衡运行特性及冗余保护策略
Bridge-Arm Asymmetric Operation Characteristic and Redundant Protection Strategy of Modular Multilevel Converter
徐谦 1孙黎滢 1徐晨博 1杨升峰 1刘高任 2徐政2
作者信息
- 1. 国网浙江省电力公司经济技术研究院，杭州310000
- 2. 浙江大学电气工程学院，杭州310027
- 折叠
摘要
Abstract
When there is fault in submodule of modular multilevel converter (MMC),MMC will run in the state of asymmetric bridge arm,which can cause circular current increasing of fundamental frequency,further affects the performance of MMC.Therefore,this paper considers the comprehensive effect of redundant sub-modules and bridge-arm asymmetric operation,and analyzes the mathemati-cal model of MMC and sub-module (SM)switch function and circular current in detail.On this basis,this paper proposes an opti-mized redundant protection strategy.Unlike previous strategies,the sub-modules in healthy arms need not be bypassed when SM faults occur and asymmetry degree will be reduced by regulating the base voltage of SM.A model of two-terminal MMC-HVDC system is built in PSCAD/EMTDC,the simulation result proves that the proposed strategy can ensure the system operate well under arm-asym-metric conditions and the ability of the converter to resist the sub module fault is enhanced.关键词
模块化多电平换流器/冗余保护/环流抑制/桥臂不对称运行Key words
modular multilevel converter/redundancy protection/circular current suppression/bridge-arm asymmetric operation分类
信息技术与安全科学引用本文复制引用
徐谦,孙黎滢,徐晨博,杨升峰,刘高任,徐政..模块化多电平换流器桥臂不平衡运行特性及冗余保护策略[J].南方电网技术,2016,10(11):1-8,8.
