An Integrated Conversion System and Charge Balance Control Strategy for PHEV Based on MMMC

This paper proposes a plug-in hybrid electric vehicle (PHEV) integrated conversion system, which is based on modular multilevel matrix converter (MMMC). The proposed system could both realize motor drive and battery power management without additional charging circuit. To control this system, the charging control strategy from external power supply is studied. By establishing the small-signal model and analyzing the power relationship between different parts, a balanced charging control strategy by adjusting the battery states of charge (SOC) of each phase, bridge arm and the sub- module is proposed, the core of which is the MMMC bridge arm current control strategy. The experiments run on the RTLAB hardware-in-the-loop simulation experiment platform. And the results verify the feasibility and effectiveness of the proposed SOC balanced charge control strategy.

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