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首页> 外文期刊>IEEE Transactions on Industrial Electronics >Generalized Likelihood Ratio Test Based Approach for Stator-Fault Detection in a PWM Inverter-Fed Induction Motor Drive
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Generalized Likelihood Ratio Test Based Approach for Stator-Fault Detection in a PWM Inverter-Fed Induction Motor Drive

机译：PWM变频器供电的感应电动机驱动器中基于广义似然比测试的定子故障检测方法

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摘要

This paper proposes a new approach for the detection of stator faults in inverter-fed induction motor under closed-loop control. These faults, generally, start with interturn short circuit and can evolve to phase-to-phase or phase-to-ground faults, leading to stator currents unbalance. In the considered application, the stator windings are supplied by a static converter for the control of the speed and the rotor flux of the motor. The unbalance fault has been artificially created through additional resistance in series with one phase of the stator windings. The proposed diagnosis approach is based on the computation of the symmetrical components of the stator currents. The supply fundamental frequency and the three-phase phasors are estimated based on the maximum likelihood estimator. Then, the generalized likelihood ratio test is applied for unbalance fault detection. Simulation and experimental results on a 1.5-kW induction motor illustrate the effectiveness of the proposed approach, leading to an effective diagnosis procedure for stator faults in inverter-fed induction motor under steady state and closed-loop operation.
机译：本文提出了一种在闭环控制下检测逆变器感应电动机定子故障的新方法。这些故障通常从匝间短路开始，并且可能演变为相间或相接地故障，从而导致定子电流不平衡。在考虑的应用中，定子绕组由静态转换器供电，以控制电动机的速度和转子磁通。不平衡故障是通过与定子绕组的一个相串联的附加电阻人为产生的。所提出的诊断方法基于定子电流对称分量的计算。基于最大似然估计器估计电源基频和三相相量。然后，将广义似然比检验应用于不平衡故障检测。在1.5 kW感应电动机上进行的仿真和实验结果证明了该方法的有效性，从而导致了在稳态和闭环运行下对逆变器供电的感应电动机中的定子故障进行有效诊断的程序。

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