Abstract
The direct matrix converter is a well-accepted topology for AC/AC converters. The commutation method should be considered in the direct matrix converter topology to avoid failures caused by the input short circuit and output open circuit during commutations. The conventional three-step commutation method of input voltage not only avoids the aforementioned failures but also removes errors between actual and command output voltage. However, it increases the number of hard switching and the flow of inrush current originating from the mismatch between the turn-on and turn-off delay time of switches. This paper proposes a new three-step commutation method that eliminates inrush current and reduces the number of hard switching. In this way, the conversion efficiency is improved, and circuit hazards caused by inrush current are over. Meanwhile, the proposed commutation method keeps the advantage of canceling the voltage error of conventional three-step commutation. Noteworthy that the proposed commutation method is introduced based on a novel fixed-slope direct duty ratio PWM simplifying the practical implementation. The performance and effectiveness of the proposed method have been verified by simulation and experimental results.
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