Improved two-steps voltage-commutation strategy under non-1 input power factor in matrix converter

Matrix converter is a new power electronic topology with many advantages, such as high power density and adjustable input power factor. But in its industrial application, short-circuit is prone to happen due to the faulty commutation method. Even the phenomenon is worse under the non-1 input power factor. To solve above problem, this paper presented an improved two-steps voltage-commutation strategy which is based on the conventional commutation with transitional intervals. By introducing the “rearrangement of switching states” of space vector modulation, the proposed method changes the phase having high differential voltage with the others in mid of modulation sequence, ensuring the commutations can not occur between the phases with adjacent voltage value. The simulation and experimental results verify the feasibility of the method under various input power factor.