SVM Strategy for Mitigating Low-Order Harmonics in Isolated AC-DC Matrix Converter

Isolated ac-dc matrix converter features bidirectional power conversion, galvanic isolation, and high power density. However, the conventional pulsewidth modulation methods in the literature can lead to the input ac distortions in the isolated ac-dc matrix converter with excessive low-order harmonics. To improve the current quality and maintain a low number of switching actions, an improved space vector modulation (SVM) strategy is proposed in this article. The SVM switching sequence and the distribution of zero vectors are designed to mitigate the low-order harmonics. To verify the performance, an in-depth study of the harmonics generation mechanism in the converter is conducted based on a developed mathematical converter model. The performances of the conventional SVM strategy and the proposed SVM strategy are compared, and simulation and experimental results are provided.