Fuzzy PI controller for improved voltage regulation in STATCOM based SEIG

This paper proposes a fuzzy PI based voltage control scheme of the self-excited induction generator (SEIG) using static synchronous compensator (STATCOM) for feeding balanced and unbalanced load. The main aim of SEIG discussed in this paper is to regulate voltage under balanced and unbalanced load conditions. A three-phase insulated gate-bipolar-transistor based current controlled voltage source inverter working as a static synchronous compensator (STATCOM) is considered. Performance of STATCOM depends entirely on capacitor voltage and performance of STATCOM with a PI controller provides a high DC voltage across capacitor during start up. To optimize the start-up DC voltage the proposed fuzzy PI based voltage control scheme has been developed which yields superior response under balanced and unbalanced loading case.