Control design of matrix converter system

The presented paper deals with matrix converter induction motor drive with emphasis on the PWM modulation strategy design. The special digital control system was used. This system consists of two personal computers. The first one serves for monitoring purposes only, the second one is equipped with a common interface card and works in real time. The most of the contemporary modulation strategies are able to provide practically sinusoidal waveforms of the input and output currents with negligible low order harmonics, and to control the input displacement factor. Sophisticated pulse width modulation strategies in terms of various optimization criteria are known in case of indirect frequency converters, whereas both the inverter and the rectifier can be operated with pulse width modulation. The instantaneous state of both the output and the input converter waveforms depends at any time on the switch state of the converter power switches. Suitable switch states sequence of the nine matrix converter switches can be indirectly derived from the given switch states sequence of the twelve switchers of the indirect frequency converter. Attention is paid to overmodulation possibilities, too.