Simulation method for phase-shift controlled AC-AC converters based on switching vector

An efficient method to simulate voltage and current waveforms of phase shift controlled AC-AC converters is presented. The method is based on switching vector, which is space-vector of switching functions, and on the complex Fourier-series of it. The only constraints of our method are that the output frequency and modulation method of the converter are predefined. However, it is not necessary to describe the modulation process of the individual thyristors, because the switching vector contains the necessary information of the operation of the converter. Waveforms of sinusoidally modulated AC-AC converters and naturally commutated cycloconverters are presented, when the load is a single-phase resistive and inductive network. Output voltage calculation is based on the switching vector and output current is calculated numerically from the known voltage and load. Possible discontinuity of the output current is taken into account.