Study on Switching Pattern of Matrix Converter Based on the Line-to-line Voltage Synthesis Strategy

As a new variable frequency and variable voltage control scheme,the three output phases are connected to any one of the three input phases by the bi-direction power switches.The expected output voltage of certain frequency and amplitude can be deserved by controlling the nine bi-direction switches with some kind of modulation strategy.The input and output characteristics of matrix converter depends on the modulation strategy directly and the selection of switching pattern is the key of modulation.Based on the line-to-line voltage synthesis method,the various switching patterns were discussed,as well as their influence on the switching losses,input/output characteristics and the commutation reliability of the bi-direction switches.Meanwhile,the symmetrical pattern is the best among these switching patterns.Finally,the simulation and experiment results were given to verify the correctness of the conclusions.