Hysteresis current controlled three phase PWM converter

The paper presents hysteresis current controlled 3-phase PWM converter. The switching control is applied on three-phase bi-directional switches, to attain sinusoidal I/P current at unity power factor. The dc-link voltage is controlled by outer loop PI controller. The converter can be used for bidirectional power flow. The bi-directional switches operate at low frequency, crossover zero voltage (at turn-on) and conduct for 1/12^th of line voltage cycle. The THD analysis of the controlled input phase current shows significant reduction in the THD as compared to the uncontrolled input phase current. The dc-link voltage follows the reference value.