基于观测器的MMC功率模块故障诊断方法  

Fault Diagnosis for Power Modules of Modular Multilevel Converter Based on Observers

作　　者：莫跃 刘明 王健[1] 林康泉 宋海彬[1] 关宇洋 MO Yue;LIU Ming;WANG Jian;LIN Kangquan;SONG Haibin;GUAN Yuyang(Tianshengqiao Bureau of CSG EHV Transmission Company,Xingyi,Guizhou 562400,China;Electrical Engineering College of Guizhou University,Guiyang,Guizhou 550025,China)

机构地区：[1]中国南方电网有限责任公司超高压输电公司天生桥局,贵州兴义562400 [2]贵州大学电气工程学院,贵州贵阳550025

出　　处：《广东电力》2021年第9期80-86,共7页Guangdong Electric Power

基　　金：中国南方电网有限责任公司超高压输电公司科技项目(CGYKJXM20180354)。

摘　　要：针对模块化多电平换流器(modular multilevel converter,MMC)功率模块故障问题,采用标称模型观测器进行故障检测与隔离。对功率模块每一种可能的结构性故障构造一个故障模式观测器,对每一个可能发生故障的参数构造一个自适应观测器。通过观察功率模块各个观测器的残差曲线,将发生的故障隔离出来,同时也实现了故障辨识。根据功率模块电容器电容值变化故障的特点,采用李雅普诺夫方法设计自适应观测器,保证状态参数联合估计的收敛性。采用功率模块硬件电路对所提方法进行实验研究,验证此方法用于功率模块故障诊断的有效性。Aiming at the problem of power module fault of the modular multilevel converter(MMC),a nominal model observer is used for fault detection and isolation.A fault mode observer is constructed for each possible structural fault of the power module,and an adaptive observer is constructed for each parameter which has possibility of occurrence of fault.By observing the residual curves of each observer,the fault can be isolated and identified.The Lyapunov method is used to design an adaptive observer for parametric fault in the power module capacitor with capacitance deviation,which guarantees the convergence of joint state-parameter estimation.The power module hardware circuit is used to carry out the experimental research,and the experimental results show that the proposed method is effective in power module fault diagnosis.

关 键 词：故障诊断 观测器 自适应观测器 模块化多电平换流器 功率模块 

分 类 号：TM46[电气工程—电器] TM744.3