Generalised double line voltage synthesis strategy for three‐to‐ N phase matrix converter

Abstract

This study proposes a generalised double line voltage synthesis strategy for 3 × N matrix converter. This strategy is simple without segment partitions and combinations, and it can be easily extended to any number of output phases. In order to gain the maximum VTR, the input line-to-line voltages and the `source key' are selected reasonably, according to the polarity of the input and output phase voltages which have maximum absolute value. The relationships between input and output voltages are obtained and the general expressions of duty ratios are derived. Further, input currents are analysed when input voltages are balanced or unbalanced. In addition, this study also proposes an innovative arrangement of switching sequence, which makes the relationship of duty ratios only one fixed case. This strategy reduces the complexity of control algorithm and inherits the advantage of traditional method. Desired output voltages are realised under both balanced and unbalanced input voltages. The feasibility and effectiveness of the proposed strategy are validated through the experimental results of 3 × 3 MC and 3 × 5 MC.