A Scalar Decoupled PWM Technique for a Three-Level Symmetrical Dual Inverter Fed OEWIM Drive for Electric Vehicle

Abstract

Induction motor is employed in electric vehicle to control the speed. Dual inverter fed drives are used for this purpose. Even though it finds application in many applications, high common-mode voltage (CMV) becomes a major problem and it results in EMI problems. Hence, to overcome this problem, this work introduced a novel PWM generation technique named scalar decoupled PWM topology to control a three-level symmetrical DI fed OEWIM.  In this proposed topology, switching signals of the inverter 1 and 2 can be generated and controlled separately. To examine the efficiency of the proposed topology, its operation is examined under both continuous and discontinuous modes of operation and is carried out in both simulation and experimental set up. From the acquired results, it is concluded that this proposed topology exhibits reduced CMV and harmonics when compared to traditional PWM topology.