Hybrid commutation method with current direction estimation for three-phase-to-single-phase matrix converter

摘要

This paper proposes a hybrid commutation method for a three-phase-to-single-phase matrix converter. Commutation failures in the voltage commutation method result in an increase of grid current distortion (THD), whereas the commutation failures in the current commutation method lead to an increase in snubber capacitor voltage. The proposed commutation method combines the voltage and current commutation methods in order to suppress the commutation failure effects. In particular, the current commutation is operated based on the original estimation method for the high-frequency output current. As experimental results, the proposed commutation method improves the grid current THD by 64%, whereas the snubber capacitor voltage is reduced by 13%.