Review of closed-loop duty-cycle-based control algorithms applied to a three-phase current injection unity-power-factor rectifier

In this paper, a comparative analysis of feedback duty-cycle-based control laws applied to three-phase current injection rectifiers is proposed. The study concerns mainly the fixed-frequency carrier-based pulse-width-modulated (PWM) controllers. The superiority of the fixed-frequency controllers over the hysteresis-based ones is briefly emphasized. The design and performance evaluation of the considered control systems are based on a mathematical model of the converter, obtained by applying the state-space-averaging modeling technique. The performance of the controllers is analyzed through numerical results. Advantages and drawbacks of each proposed control law are discussed, and a comparative performance status in terms of input current total harmonic distortion (THD), DC voltage regulation and dynamic characteristics is established.