Hybrid Modulation-based Harmonic Suppression Method for a Matrix Converter

In the process of synthesizing output voltage through high-frequency modulation of input voltage, matrix converters inevitably encounter high-frequency harmonics, which not only affect output performance but also reduce input performance through bidirectional switching of matrix converters. A hybrid modulation method is proposed to improve the output side performance of matrix converters in response to the above issues. Firstly, the working principle of the modulation method for suppressing the frequent switching of the maximum amplitude phase and its shortcomings in suppressing the high-frequency harmonics at the output side are analyzed in detail. Secondly, a hybrid modulation method for reducing the switching times of the switch tube while avoiding the frequent switching of the maximum amplitude phase in different sectors is proposed by identifying the input and output sectors, and the distribution law and action time expression of the switch sequence under this modulation method are analyzed and deduced. Finally, a laboratory prototype is built for experimental verification, and the results validate that the proposed hybrid modulation method is feasible and effective to further suppress high-frequency harmonic at the output side.