A Novel Multi-Source Inverter for PMSM Drives with Internal Boost Function

This paper proposes a novel multi-source inverter topology with integrated dc-bus boost function, which utilizes the neutral point of a three-phase motor to power the entire system, and employs an additional four-switch leg to achieve switching between battery and ultracapacitor power supply for power distribution. First, the average model of the proposed multi-source inverter is established, which reveals the mechanism of dc-bus boost function by multiplexing the zero-sequence channel of the motor drive system. Then, the corresponding control strategy is designed to be applied to the proposed multisource inverter. Finally, the effectiveness of the proposed topology and control strategy is verified by simulations.