Background: In this study, a new model-based fault detection and isolation (FDI) strategy of
IGBTs open circuit faults detection and diagnosis in voltage source inverter (VSI) is proposed for space
vector modulation direct torque control (SVM DTC) permanent magnet synchronous motors drives.
Methods: The method is based on the bridge leg pole voltage, when with an additional simple circuit,
the diagnostic method detected and effectively identified single and multiple open-circuit faults of
inverter IGBTs. Also, a fault compensation strategy is suggested by using the information of the modelbased
FDI stage composed of a four-leg inverter in which the fourth inverter leg is used as hardware
Results: The simulation results of fault detection, identification and compensation methods are included
to prove that the proposal leads to good results.