Commutation methods of PWM rectifier section for converter without DC link components and operating characteristics for induction motor drive

摘要

Two commutation strategies for the PWM rectifier section of the converter without DC link components are described. The advantage of the systems is the snubberless circuit of the rectifier section. The first method is so commutated that the voltage vector is held during commutating the rectifier switches with sensing dc link current. Another is commutated during zero voltage vector period of the inverter. These two strategies are verified by computer simulation and compared under 0.75kW induction motor drive.