Space vector modulation for a single phase to three phase converter using an active buffer

Abstract

This paper proposes a space vector modulation scheme for a new single phase to three phase power converter that using an active buffer. The proposed circuit is based on the control theory of an indirect matrix converter which can successfully reduce the volume of the smoothing capacitor in the DC link part. The proposed circuit needs to control the output voltage and the buffer current at the same time. In order to reduce the output voltage and the input current harmonics, a space vector modulation scheme is proposed. In this paper, the basic operation of the proposed method is confirmed by experimental results. The input current THD and the output current THD around the fundamental component frequency are 3.34% and 6.65%, respectively. Moreover the capacitor current THD in the input filter and the output voltage THD that is below than 15 kHz switching frequency are improved by 10% and 17% because the switching waveforms becomes symmetrical shape. The validity of the proposed method is confirmed with these results.