基于三相电流检测的逆变器开路故障诊断及容错方案研究  

Inverter Open-circuit Fault Diagnosis and Its Fault-tolerant Method Based on Three-phase Current Detection

作　　者：王志远[1] 张杰[1] 王雨琦[1] 宋文胜[1] 葛兴来[1] 

机构地区：[1]西南交通大学电气工程学院,四川成都610031

出　　处：《机车电传动》2014年第2期105-109,共5页Electric Drive for Locomotives

基　　金：国家自然科学基金-高铁联合基金重点项目(U11344205)资助

摘　　要：为解决逆变器开路故障诊断问题及充分利用剩余桥臂资源,针对基于矢量控制的异步电机驱动系统中逆变器开路故障诊断及容错方案,采用逆变器输出三相电流信号作为特征参数,利用小波分析理论提取特征向量,进而通过支持向量机(SVM)判断逆变器是否故障。当SVM检测到逆变器故障时,逆变器由传统的六开关拓扑切换为四开关拓扑,采用四开关模式"七段式"空间矢量脉宽调制(SVPWM)算法调制。通过计算机仿真验证了SVM诊断逆变器开路故障及四开关容错控制的正确性和有效性。Inverter open-circuit fault diagnosis and fault-tolerant method based on vector-controlled induction machine drive system with utilization of remained bridges was proposed. Signals of inverter three-phase current were taken as characteristic parameter, and based on wavelet principle, eigenvectors were extracted, and then inverter failure was detected through the support vector machine （SVM）. When inverter fault was detected by SVM, traditional six-switch topology was changed to newly tour-switch topology with tot/r-switch mode algorithm modulation of space vector pulse width modulation （SVPWM）. Validity and effectiveness of the SVM for inventor open-circuit fault diagnosis and the control strategy for four-switch inverter was proved by simulation.

关 键 词：矢量控制 逆变器 故障诊断 小波分析 支持向量机 容错 四开关 

分 类 号：TM464[电气工程—电器] U264.372[机械工程—车辆工程]