Comparative Study of AC Voltage Controllers

Abstract

— This paper describes a single phase AC to AC Power Electronic Converter that converts fluctuating electrical power from incoming AC mains supply into controlled value of true RMS AC voltage for the load, within the predestinated tolerance limits of line disturbances. These power electronic converters are periodic variable structure systems due to built in static semi-conductor switched operation with magnetic or electrostatics isolation interface. The present topology, Solid State AC Voltage Controller hereinafter abbreviated as SSVC, has unique power circuit design without any energy storing device like dc link capacitor. It is compact in size because main auto transformer has to handle only variable portion of the rated output power without cutting off the supply load current.