Space vector alpha beta current regulator for sliding mode controlled unity power factor PWM rectifiers

A new α-β input current regulator together with a robust sliding mode output voltage controller presenting no steady-state errors, suitable for voltage sourced unity power factor three phase PWM rectifiers is described. This “just in time” switching controller controls the output voltage and the line input currents to provide bi-directional power flow near unity power factor operation low harmonic content fast dynamic response of the output voltage and minimum switching frequency due to a new α-β space current regulator. The voltage controller performances are compared with the behaviour of the conventional proportional integral (PI) output voltage control aided by PWM current mode modulators. The comparison shows that the proposed controller confers faster dynamics and performance independent of system parameters and load