Abstract：In order to reduce the commutation time,improve the converter reliability,an improved two-step safe commutation strategy is presented on the basis of analyzing the characteristics of the existing traditional converter through the direction of the output current and input line voltage amplitude detection.For cutting down,the number of switch reduces convert time and solves the influence of load current direction with effective combination of two-way switch tube conduction state by dividing sector in the input voltage; introducing the intermediate sector and combined with zero vector modulation avoid the short circuit when voltage amplitude are close,amd it can improve waveform quality.Executed experiment in the prototype controlled by the DSP + FPGA,experimental data verified the feasibility of the new commutation strategy.

Keyword：matrix converter;voltage controlled;two-step commutation;intermediate sector;