Contents I. Introduction
Matrix converters are forced commutated converters based on a matrix of bidirectional switches. Their main feature is the absence of a DC link with the function of energy reservoir. A DC link can be present in the so-called indirect matrix, where the switches are organized in two distinct parts: a line part that operates like a rectifier, and a load part that operates like an inverter, but without the reservoir capacitor. In the direct matrix converter, an array of nine switches directly connects the line with the load. Although currently not so widespread in industrial applications, matrix converters have the desirable properties of a simple and compact circuitry, of arbitrary amplitude and frequency of load voltage, of sinusoidal input and output current and of arbitrary input power factor [1].
