Carrier-based modulation schemes for various three-level matrix converters

Abstract

Matrix converters with three-level phase switching and five-level line switching characteristics have recently been proposed as improved ldquoall semiconductorrdquo ac-ac power processors. For their control, different modulation schemes have also been developed with different researchers claiming different performance merits. To avoid confusion and hence fasten the converter applications in the industry, it would surely be better for modulation schemes to be developed from a common set of modulation principles that unfortunately has not yet been thoroughly defined. Contributing to that area of investigation, this paper now presents a scheme for controlling a three-level indirect matrix converter, which then serves as the conceptual platform for extending the principles to other matrix topologies including the newly described 4times3 matrix converter and a third type of matrix converter that uses a limited set of switching vectors because of its lower semiconductor count. Through simulation and experimental testing, all the evaluated matrix converters are shown to produce satisfactory sinusoidal input and output quantities using the same set of generic modulation principles, which can conveniently be implemented on a single common hardware platform.