Research on Novel Space Vector Modulation Strategy Based on Quasi‐Z Source Three‐Phase Four‐Leg Matrix Converter

Abstract

Non-member Jian Long a , Non-member Due to the low voltage transmission (no more than 0.866) and weak anti-interference ability of the Four-leg Matrix Converter (4LMC), its application in grid-connected transformation is limited. Therefore, this paper proposes a new modulation strategy of the Four-leg Matrix Converter (4LMC) based on quasi-Z source (QZS). Firstly, the boost principle of QZS-4LMC and three-dimensional space vector modulation strategy are analyzed. Secondly, on the basis of the three-dimensional space vector modulation, the shoot-through zero vector is inserted into the three-dimensional space vector modulation by dividing the shootthrough zero vector into 16 equal parts by using the shoot-through state instead of some zero vectors, so as to obtain a new modulation strategy. Then, the simulation model of QZS-4LMC is built in MATLAB/Simulink to analyze the control strategy. Finally, the experimental results verify the correctness and effectiveness of this new modulation strategy.