Two-switches-based AC-link three-phase voltage regulator

This paper presents a topology for a PWM controlled three-phase voltage regulator which uses only two driven switches giving high reliability and making the switching stage simpler and cheaper compared with other available configurations. The proposed topology is suitable for voltage regulation on the distribution power system and able to regulate the steady state voltage and to reject voltage variations such as flicker or sags caused by big motors start, the compensator is free of energy storage elements.