Improvement of Commutation Strategy for Matrix Converter Based on Two-line Voltage Synthesis

The commutation problem of matrix converter is one of the major reasons that there are few practical applications.The process of traditional four-step commutation strategy is analyzed based on two-line voltage synthesis,which reduce the reliability of commutation and induce the distortion of input and output waveforms because of the delay of commutation moment.Then two-step commutation strategy is presented by reducing the commutation time of four-step commutation strategy.The simulation model of matrix converter is built with Matlab/Simulink software,and the experiments are held on by the platform of dSPACE hardware realtime simulation.The simulation and experiment results have verified that the commutation reliability and the quality of input and output waveforms are both improved by two-step commutation strategy.Compared with traditional four-step commutation strategy,the output current THD of two-step commutation strategy is reduced to 2.67% from 4.68%.