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

Authors: GAURAV GOYAL, MOHAN AWARE

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

Keywords: Common frequency mode, fifteen-switch inverter, sinusoidal pulse width modulation, space vector pulse width modulation

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