The Improvement of Power Quality in an ac-ac Direct Matrix Converter by Using Hybrid Filters

The present study aims to improve the power quality of an ac-ac direct matrix converter using hybrid filters. In this paper, a direct matrix converter (without a dc capacitor) is investigated. The studied case causes current and voltage harmonics at the input and output of the converter. To improve that, in this paper, the harmonics are identified and suitable active, passive and hybrid filters are designed to remove the harmonics to improve the power quality. Finally, to evaluate the performance of the proposed strategy in a quasi-real environment, the matrix converter with the different filters is simulated in MATLAB software. The results prove that the proposed hybrid filter can improve the power quality to a large extent, almost 50%.