南方电网技术2017，Vol.11Issue(7)：51-57,7.DOI:10.13648/j.cnki.issn1674-0629.2017.07.009
MMC子模块IGBT开路故障诊断策略
IGBT Open-Circuit Fault Diagnosis Strategy for MMC Sub-Module
摘要
Abstract
The fault probability of sub-modules in modular multilevel converter ( MMC) stays at a high level, fast and precise diagno-sing and isolating the faulted sub-modules are critical for MMC to improve the operation conditions of converter and avoid unnecessary outages.Based on analysis of open-circuit fault characteristics of insulated gate bipolar transistor ( IGBT) of sub-modules, a sliding mode observer is constructed to observe arm current and detect swiftly open-circuit fault in IGBT sub-module.By using the difference and changing rate between the measured value and the calculated value of arm current, fault type of the sub-module can be distinguish-ed, relevant part of the sub-modules is selected according to the types of fault, then by calculating the ratio of the actual value against the theoretical value of the current flowing through sub-modules, the faulted sub-module can be located.Simulation on an MMC-HVDC system established on PSCAD/EMTDC shows that the proposed fault diagnosis method can reduce the computation of fault lo-cation effectively, detect and locate IGBT open-circuit fault accurately and swiftly.关键词
模块化多电平换流器(MMC)/子模块故障特性/滑模观测/故障诊断Key words
modular multilevel converter ( MMC)/sub-modules fault performance/sliding mode observer/fault diagnosis分类
信息技术与安全科学引用本文复制引用
郭彦勋,李海锋,李健涛,洪潮,陈雁,王钢,钟庆..MMC子模块IGBT开路故障诊断策略[J].南方电网技术,2017,11(7):51-57,7.基金项目
国家自然科学基金资助项目(51577072).Supported by the National Natural Science Foundation of China (51577072). （51577072）
