Displacement angle control of matrix converter

The authors previously proposed and discussed a control method for matrix power converters in which instantaneous input voltages are used. The method can generate output voltages of 0.866 times the supply voltage. Control input current and output voltage of sinusoidal waveform can be obtained and can compensate the effect of fluctuation, asymmetry or harmonics in both the output voltage and the input current. In the method described in this paper, a combination of offline and online computation is used to enable input power factor control in order to realize real unity input power factor. The authors discuss a switching sequence during one carrier period by which the input current waveforms can be greatly improved without increasing switching losses.