A NEW MODULATION TECHNIQUE FOR REDUCING THE INPUT CURRENT HARMONICS OF A 3-PHASE DIODE RECTIFIER WITH CAPACITIVE LOAD

In this paper, a new technique for shaping the line current and reduci ng the total harmonic distortion in a three-phase bridge rectifier, fe eding a capacitive load, is presented, Using the topology of a three-l evel three-switch pulsewidth modulated (PWM) rectifier, a new control technique has been implemented, The main objective here is to minimize the total harmonic distortion (THD) of the line current under differe nt load conditions (20%-100% of full load), A review of the problems i nherent in a bridge rectifier feeding a capacitive load and the possib le solutions are first presented, Subsequently, the analysis of the ne w circuit and the control technique used are described, along with sim ulation results, Finally, the experimental results on a 1.6-kW prototy pe are presented.