Reliable 3-phase PWM boost rectifiers employing a stacked dual boost converter subtopology

This paper describes circuit topologies for 3-phase pulse-width modulation (PWM) boost rectifiers that operate dth a unity fundamental power factor and a low-distortion ac line current. Overlap delays between the switching of the upper and lower devices in a PWM I rectifier leg are not critical and diodes eliminate the possibility of the de-link capacitor discharging into short circuits and shoot-through fault conditions, The rectifiers are controlled using a ''stacked dual boost converter cell'' subtopology model that can be used in two current control modes, The dual current-control mode shapes two line currents and ran achieve current distortion levels below 5 % The single current-control mode shapes one line current and can achieve current distortion levels close to 5% with the rectifier output de voltage at the standard level associated with a rectified mains voltage, The per-unit current ratings for the switches in the 3-phase PWM switch networks are around 15-20 % of the input rms line current as compared to 71 % for a standard 3-phase PWM rectifier, Circuit simulations and experimental results are used to demonstrate the performance and feasibility of the rectifiers described.