Investigation of the overvoltage in the inverter caused by the motor deceleration

Abstract

The overvoltage in the inverter that supplies the AC induction motor, which during the deceleration operates as a generator delivering current back into the inverter DC bus, has been investigated. The investigation was performed using a special test bench. The impact of the motor deceleration rate, motor load and initial rotation velocity, at which the deceleration starts, on the overvoltage was investigated and analyzed. The obtained results vvere employed for the development of the DC bus overvoltage fault protection of the inverter.