Modeling and design of a vector-controlled PWM active rectifier

This paper presents both computer model and design of a three-phase vector-controlled voltage-source pulsewidth modulated (PWM) active rectifier, rated at 32 kW. A digitally-implemented space-vector pulsewidth modulation (SVPWM) is used for generating the switching signals for the insulated-gate bipolar transistor (IGBT) switches. The signals are obtained by sensing/closed-loop processing of ac input and do output current/voltage for tight bus regulation in both transient and steady state, at near unity power factor, i.e., at nearly sinusoidal input current in phase with voltage and with minimum harmonic content. The d-q voltage vector control in the synchronous frame, preceeded by the stationary-to-synchronous Park vector transformation and followed by the synchronous-to-stationary reference frame (inverse Park) transformation and duty-cycle/switching-vector determination, as well as the SVPWM generation have been hierarchically modeled using Saber simulator and practically implemented, with simulation and experimental results verifying the theoretical concepts