PERFORMANCE OF INDIRECT MATRIX CONVERTER AS ASYNCHRONOUS LINK BETWEEN TWO AC SYSTEMS

Abstract

This paper discusses an Indirect Matrix converter(IMC) topology used to supply a three-phase load directly from three phase AC power source without using any large electrolytic capacitors in the intermediate dc link. The Indirect Matrix converter considered here, consists of an input stage and two output stages with a pair of voltage source inverters. An improved switching configurations is selected for the Inverters based on the output space vectors and its switching table is developed to minimise switching losses and output distortion. The dc link voltage for the rectifier stage is controlled by a new modulation technique to obtain maximum dc voltage with unity power factor (UPF) for the fundamental at the input side. The performance of IMC as an asynchronous link between two ac systems is proposed for different frequencies at the rectifier and inverter stages with bidirectional power flow. Also, the IMC is operated for multiple loads (active and passive loads)at variable frequencies. The performance of the IMC with the proposed modulation techniques are shown through simulation results.