A new control strategy for the PWM current stiff rectifier/inverter with resonant snubbers

In this paper, a three phase current stiff type converter topology employing resonant snubbers with one auxiliary switch is reviewed. A new four quadrant control/modulation scheme is introduced for this topology leading to significant improvement on the utilization of the main devices over previously reported techniques. Voltage and current stresses on the main devices are reduced to the same levels observed in classical snubber topologies. Another benefit is the reduction of the ratings of the resonant snubber inductance and auxiliary device. Simulation results are included to illustrate the improvement introduced with the proposed control scheme