Shunt based active Power Factor Correction for Direct Torque Controlled PMSM Drive

Abstract

This paper improves the power factor of the direct torque controlled inverter fed PMSM drive. The proposed circuit includes the two parallel diode bridge rectifiers capable of providing good power factor also maintains the simplicity. Generally, circuits with a single-bridge rectifier suffer from severe distortions in the phase angle of the input voltage and current, resulting in very low PF. Series connected a high-inductance inductor on ac side, through turn-on parallel-connected power switch to charge inductor. When switched off, energy stored in the inductor is added to the ac power through the rectifier to mitigate the phase angle of the input voltage, so as to improve the PF.