A novel control method for direct interface converters used for DC and AC power supplies

This paper proposes a novel control method for a direct interface converter for management of the energy flow in either an AC or DC supply. The proposed converter is constructed based on an indirect matrix converter. Therefore a proposed control strategy is based on an indirect control method with a triangular carrier wave. This paper proposes two control methods, using a boost up and a step down type DC/DC converter. The basic operation of the proposed control method is confirmed by simulation and experimental results. In addition, this paper also proposes a commutation error compensation method for an output voltage error and an input current error for an indirect matrix converter. In the proposed method, the output voltage and input current error by the commutation can be compensated at the same time, because the PWM pulse of each switch is directly compensated. The validity of the proposed method is confirmed by experimental results. Those results prove that the proposed compensation method can decrease total harmonic distortion (THD) of the input and output current.