Abstract
A novel single-phase AC/DC converter with two pulsewidth modulation (PWM) schemes is proposed to draw a sinusoidal line current with nearly unity power factor, achieve balanced neutral point voltage and regulate the do bus voltage. With the aid of neutral point clamped scheme, a three-level voltage pattern will be generated on the AC side of the proposed rectifier. To track the line current command derived from a voltage controller and a phase-locked loop circuit, a hysteresis current control scheme is used in the inner loop control. A capacitor voltage compensator is employed to achieve the balanced neutral point voltage. Simulation results are performed to investigate the effectiveness of the proposed control scheme.
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