An SVPWM Strategy for Power Distribution in a Three-Phase Four-Leg Three-Port Inverter

Compared with traditional inverters, the T -type three-phase three-port inverter can realize bi-directional power flow in three sources with a smaller size and lower cost. In this paper, a novel T -type three-phase four-leg (3P4L) three-port inverter with two DC ports and an AC port is proposed and its output vectors are analyzed. Correspondingly, the maximum power distribution range named maximum distribution ratio control (MDRC) between two DC ports is extended from the three-phase three-wire (3P3W) system to the three-phase four-wire (3P4W) system. A mathematically proven algorithm for simplifying the calculation of duty cycles and implementing MDRC is proposed. Finally, this paper selects a three-phase unbalanced linear load to verify the proposed power control strategy in MATLAB/Simulink.