Reconfiguration of Voltage Source Inverter for Field-Oriented Controlled Induction Motor Drive druing Open-Circuit and Short-Circuit Faults

In this paper, a strategy for reconfiguration of two-level voltage source inverter during open-circuit or short-circuit of power devices in any one of the inverter legs in a field-orient controlled (FOC) three-phase induction motor drive is proposed to obtain its performance during post-fault operation close to normal operation. Capacitor voltage balance issue in split capacitor at DC link of inverter is eliminated by a single capacitor and an additional capacitor is used to connect the motor terminal of the faulty leg of an inviter. The proposed reconfiguration of inverter operates the drive in full rated operating condition during post-fault operation. Simulation results of drive system before and after fault operation at various operating conditions are presented and are found to be satisfactory and also close to each other.