Power rating reduction of distribution static synchronous compensator for voltage and frequency regulation of stand-alone self-excited induction generator

Abstract

This paper deals with the development of a new hybrid topology for voltage and frequency regulation in stand-alone micro hydro generation systems based on self-excited induction generator (SEIG). As the main contribution, the new topology proposes the rating reduction of DSTATCOM to a small part of the generated power with high voltage regulation quality. The proposed hybrid topology consist of a three-phase four legs distribution static synchronous compensator (DSTATCOM) and switched capacitor banks (SCB) connected in parallel to the point of common coupling (PCC) of a three-phase four-wire system. Voltage and frequency regulation are achieved by the association of DSTATCOM, SCB and electronic load control (ELC), this last connected by means of an uncontrolled rectifier, directly to the PCC. The association of such distinguished elements with different characteristics and the employment of suitable control techniques guarantee the voltage and frequency regulation in accordance to the international standards. Simulation and experimental results are presented to demonstrate the performance of the proposed hybrid topology on the rating reduction of DSTATCOM with efficient voltage and frequency regulation of a proposed SEIG based generation system.