A new modulation technique for a three phase PWM buck rectifier

In this paper a novel modulation technique for a three phase buck rectifier is presented and analyzed. The proposed control technique compared to the conventional control techniques exhibits a higher true power factor while providing an equivalent dynamic response. The dynamic performance of the proposed control technique is checked experimentally in a d.c. motor drive system and the results are compared to those of the classical current space vector technique. The experimental validation illustrates that the technique introduced improves significantly the input line current THD factor and achieves a greater power factor with respect to the conventional method even in cases involving important motor torque variations.