基于广义似然比检验算法的IM定子故障诊断  

Fault Diagnosis of IM Stator Based on Generalized Likelihood Ratio Test Algorithm

作　　者：郭丽娜[1] 张桂香[1] GUO Lina;ZHANG Guixiang(School of Electrical Engineering,Zhengzhou Railway Vocational&Technical College,Zhengzhou 454000,Henan,China)

机构地区：[1]郑州铁路职业技术学院电气工程学院,河南郑州454000

出　　处：《电气传动》2021年第24期40-45,共6页Electric Drive

基　　金：河南省教育科学“十三五”规划2020年度一般课题(2020YB0547);河南省教育科学“十三五”规划2020年度一般课题(2020YB0690)。

摘　　要：围绕闭环控制下逆变器驱动感应电机(IM)系统的定子故障问题,设计了一种新型的基于广义似然比检验算法的定子故障诊断方法。IM定子故障通常从匝间短路开始,可演变为相间或相对地故障,从而导致定子电流不平衡。所提出的诊断方法首先进行定子电流对称分量计算,然后基于最大似然估计器估计基频和三相相量,并应用广义似然比检验实现不平衡故障诊断。在1.5 kWIM测试平台上,用与定子绕组串联的附加电阻模拟故障,并进行了故障诊断测试,实验结果验证了新方案可对IM定子故障进行有效检测。A new method of stator fault diagnosis based on generalized likelihood ratio test(GLRT)algorithm was designed around the problem of stator faults in an inverter-driven induction motor(IM)system with closed-loop control.IM stator failure usually starts with the interturn short circuit,and may evolve into phase-to-phase or phase-to ground faults,resulting in stator currents unbalance.In the proposed diagnosis method,the symmetrical components of the stator current were calculated firstly,then the fundamental frequency and the three-phase phasors based on the maximum likelihood estimator were estimated,and GLRT was applied to achieve unbalanced fault detection.On the 1.5 kW IM test platform,an additional resistance connected in series with the stator winding was used to simulate the fault and then the fault diagnostic test was performed.The experimental results verify that the new scheme can effectively diagnose the stator fault of the IM.

关 键 词：广义似然比检验 感应电机 最大似然估计 定子故障诊断 

分 类 号：TM346[电气工程—电机]