High Performance of Three-Phase Four-Leg Inverter Based on Repetitive Control Strategy

In the paper, three-phase four-leg inverter based on improved repetitive control strategy is proposed to improve the quality of output voltage waveform. First, the three-dimensional space vector modulation (3-D SVM) method based on ABC rectangular coordinate system is adopted. Meanwhile, due to the independence of each phase under the topology structure, double closed-loop controller is performed on each phase considering the nonlinear loads or unbalance loads to simplify the control process. At last, Matlab / Simulink simulation model is built to verify the correctness and the feasibility of the proposed improved repetitive method, and high performance can be achieved under three-phase balanced or imbalanced load conditions.