A novel sensorless 60°-clamping vector classification PWM technique for switching losses reduction in three-phase PFC converters

Performance criteria of three-phase PFC converters improve significantly with increasing the switching frequency, and highly depend on the control strategy used. This paper introduces a novel sensorless 60°-clamping vector classification PWM technique for three-phase PFC converters. The proposed scheme needs no current sensor and extra calculation for identification the highest current carrying phase that must not be switched. In addition, classification algorithm offers exact positioning of the switching instants with less computational efforts and therefore shorter sampling period and higher switching frequency are possible, when compared with conventional SVM algorithms. In addition, to reduce the switching and conduction losses a novel switching pattern is presented in this paper. Simulation results on PSCAD/EMTDC software program, confirm the validity of the analytical work.