Research on Quick Diagnosis Method for Open Circuit Fault of Inverters in Permanent Magnet Synchronous Motor Drive Systems
Aiming at the problem that the performance of the permanent magnet synchronous motor drive system will de-crease when the open-circuit fault of the power switching element occurs,a fast diagnosis method for open-circuit fault of the inverter is proposed to improve the safety and stability of the permanent magnet synchronous motor drive system.Firstly,the vector modulus of the three-phase current output by the inverter in the stationary coordinate system is calcu-lated.Secondly,the three-phase current is normalized by vector modulus.Then,the average value and absolute average value of the normalized three-phase current are used as the fault feature quantity and the fault detection variable is ob-tained by calculating the fault feature quantity.Finally,fault diagnosis rules are formulated according to fault detection variables and thresholds.This method does not consider the problem of current mutation.Through MATLAB/Simulink simulation analysis,it is verified that this method can quickly diagnose and locate the 21 open circuit fault types of the in-verter at 2ms after the fault occurs.
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