A three-port interface converter by using an indirect matrix converter with the neutral point of the motor

This paper proposes a new three-phase power system that is applicable in various motor drive systems including HEV. The main circuit is based on an Indirect Matrix Converter (IMC) and the neutral point connection of a motor is utilized by connecting to an additional DC/DC converter. The DC link part of the IMC connects a boost-up type DC/DC converter and batteries to perform as a secondary power source to drive the motor. In addition, the proposed control method can utilize the leakage inductance of a motor as a boost-up reactor which will replace a common reactor in a boost-up chopper. The proposed converter has been simulated and validated experimentally using a 750 W-prototype that driven by an induction motor with V/f control. The total harmonic distortion (THD) of the input current is 4%, the THD of the output current is 3.7% and the efficiency is 96%.