Open-Circuit Fault Diagnosis of Voltage Source Inverters for PMSM Drive System using Sine-Wave Injection Method

This paper proposes a novel high-frequency sine-wave injection-based IGBT open-circuit fault diagnosis method for permanent magnet synchronous machine (PMSM) drive system. The open-circuit fault features are analyzed as the research basis. Unlike the normal current signal-based method, a high-frequency sine-wave voltage is injected into the stationary frame for the open-circuit fault detection. The extraction of high-frequency current is proposed, which is robust against the rotor speed and load variation. As the high-frequency injection voltage is injected positive and negative in one PWM cycle, the interference to the closed-loop current controller is avoided. The fault detection variable based on high-frequency current and the fault localization variable based on current error is proposed. Fault diagnosis thresholds are derived, and the fault table is constructed. The simulation results verify the feasibility and effectiveness of the proposed open-circuit fault diagnosis method.