南方电网技术2024，Vol.18Issue(6)：10-19,10.DOI:10.13648/j.cnki.issn1674-0629.2024.06.002
MMC子模块开关器件开路故障诊断策略
Diagnosis Strategy for Open Circuit Faults of MMC Sub-Module Switching Device
摘要
Abstract
When an open circuit fault occurs in the internal switching components of a modular multilevel converter(MMC),it can cause distortion of the output current,increase inter phase circulating current,and seriously endanger the safe and stable operation of the equipment.Accurately identifying the submodules where open circuit faults occur in switch devices is crucial for the stable operation of MMC systems.The fault characteristics of IGBT and freewheeling diode open circuit faults are analyzed,and an IGBT open circuit fault diagnosis method based on the ratio of capacitance voltage increment is proposed to accurately identify the submodules where IGBT open circuit faults occur.An open circuit fault diagnosis method for freewheeling diodes is proposed based on the cumulative analysis of periodic fault characteristics,utilizing the relationship between bridge arm current and switching func-tion when an open circuit fault occurs in a diode.This method accurately identifies the submodule where the diode open circuit fault occurs.And a redundant control scheme is designed.An MMC rectifier stage model is built based on the RTDS simulation platform,and the proposed fault diagnosis strategy can accurately determine the faulty components and submodules,solving the problem of dif-ficult diagnosis of open circuit faults in switch devices.关键词
模块化多电平换流器/故障诊断/IGBT开路/二极管开路/冗余Key words
modular multilevel converter/fault diagnosis/IGBT open circuit/diode open circuit/redundant分类
动力与电气工程引用本文复制引用
刘宗沛,吕世轩,郑丽君,刘琛..MMC子模块开关器件开路故障诊断策略[J].南方电网技术,2024,18(6):10-19,10.基金项目
国家自然科学基金资助项目(51977137) （51977137）
山西省"1331工程"提质增效建设计划(晋教科[2021]4号). Supported by the National Natural Science Foundation of China(51977137) （晋教科[2021]4号）
the Construction Plan for Improving Quality and Efficiency of"1331 Project"in Shanxi Province(Jin Jiao Ke[2021]No.4). （Jin Jiao Ke[2021]No.4）
