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In this paper, a method to diagnose and identify the open-circuit faults of IGBT for a six-level hybrid inverter (6L-HI) is proposed, which is based on the signals of the inner device voltages, the flying capacitor voltages and the phase currents of the inverter. Since the flying capacitor voltage sensors and the output current sensors are already employed for the inverter operation, only one additional...
In this paper, a fault diagnosis scheme of three-phase PWM inverters is proposed, which is based on a discrete wavelet transform (DWT) and a pattern recognition algorithm called support vector machine (SVM). First, a discontinuity of current signal, which is usually caused by switch open-circuit faults, is detected by the DWT, and then fault detection and isolation are processed by the SVM. The proposed...
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