A Reduced Current Ripple Overmodulation Strategy for Indirect Matrix Converter

To reduce the output current distortion, this article proposes a novel space vector overmodulation strategy for indirect matrix converter (IMC) in the overmodulation region I. First, the effect of error voltage vector on current harmonics based on minimum-phase-error (MPE) overmodulation strategy is analyzed. According to the characteristics analysis of current ripple, the proposed overmodulation strategy, without changing the selection or duty ratio of the two active voltage and current vectors, rearranges the action time and position of the zero-voltage vector to make the actual current approach the reference current value and reduces the output current ripple. Moreover, the zero-voltage vector is only used under the large current vector, which can reduce the switching times. The efficiency is improved due to the reduction of output current ripple and switching times. Finally, the effectiveness of the proposed overmodulation strategy is verified through experiments.

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