Analysis of a novel solid state voltage regulator for a self-excited induction generator

Abstract

An analysis of a solid state voltage regulator for a self-excited induction generator (SEIG) using a static condenser (STATCON) is presented. The power circuit of the STATCON-based voltage regulator employs a three-phase current controlled voltage source inverter (CC-VSI) with an electrolytic capacitor in its DC bus. The control scheme consists of two PI voltage controllers and one hysteresis current controller. The mathematical model of the proposed scheme is developed to simulate the improved performance of the SEIG with a STATCON-based voltage regulator. The voltage regulator provides the SEIG with the desirable feature of a synchronous condenser, and is capable of operating in capacitive and inductive modes. The use of STATCON saves the SEIG from de-excitation during the severe condition of load perturbation. It has a fast dynamic response for regulating the voltage when the SEIG faces sudden application/removal of load. The voltage regulating scheme is adaptive to the changing load condition and hence it is possible to operate the SEIG at almost constant voltage from no load to full load.