Research on common-mode voltage for matrix converter based on two line voltage synthesis

Based on the concept of original switch, the instantaneous value of common-mode voltage for matrix converter under the control strategy of two line voltage is analyzed in the paper and its general rules are summarized up. Two kinds of approaches are proposed by means of changing the input phase voltage corresponding with the zero-output state to reduce common-mode maximal instantaneous value of voltage. The maximal instantaneous value of common-voltage is decreased to 86.67% and 57.73% respectively. At the same time, this paper analyzes the influence on the local averaged value in duty time of output line voltage and input phase current as well as switching times due to the change of the input phase voltage corresponding with the zero-output state. The validity of the conclusions is demonstrated by simulation.