ABSTRACT
The three-phase AC/AC matrix converters have attracted lots of interest in the 1990s. The conventional AC/AC matrix converter is a matrix of switches that allows an independent control of frequency, amplitude, and phase of the outputs while the operation is synchronized with the input AC waveforms for operation with controllable displacement power factor. The pulse width modulation (PWM) control of the switches within the matrix converter topology must ensure always a path for the circulation of the load current. Matrix converters are a very attractive subject for academic research and development as it offers work with advanced concepts of PWM and filtering, or voltage and current source operation. The success of the conventional matrix converters is limited when trying to replace the conventional back-to-back converter solutions. The load current is reflected towards the grid through switches into a pulsed current. The bi-directional switch must be able to conduct currents of both directions, and to block voltages of both polarities.
