A novel starting strategy for three phase voltage-fed inverter induction motor drives under inverter fault conditions

Three-phase voltage-fed inverter induction motor drives are prone to shoot-through and other inverter faults which cause the drive system to shut down. The paper describes a novel strategy for restarting the drive in variable voltage variable frequency single-phase mode in the presence of open base drive and shoot-through faults in the inverter. The proposed method requires only the motor terminal voltages and currents to be measured. Therefore, it can be applied to even low-performance open loop drives. The starting strategy described in this paper is expected to provide an economic alternative to more expensive redundancy techniques which find justification only in a few specialized applications