Pulse width modulation control of fifteen-switch inverter for four AC loads

Abstract

: In many studies in the literature, various topologies with reduced switch count are proposed. With the useof these topologies, a lower number of semiconductor switches are required to produce a desired set of voltage. This inturn reduces the size and cost of the inverter. This paper proposes a new reduced switch count topology named “fifteenswitch inverter (FSI)”, which is experimentally verified. The FSI has five switches in one leg and have three legs for threephases. It is capable of controlling four three-phase ac loads. In this proposed inverter topology, fifteen switches areused against the twenty four switches in conventional two-level inverter to control four ac loads. The proposed control isimplemented using modified sinusoidal and space vector pulse width modulation techniques. A comparative performanceof FSI with conventional sinusoidal pulse width modulation and space vector pulse width modulation are presented inlinear operating region. The structure and the principle of operation of the proposed inverter are introduced and verifiedusing simulation. The inverter prototype was built and the proposed inverter has been verified experimentally usingdigital signal controller. The experimental results verify the applicability of the proposed inverter and the employedpulse generation technique.