Static capacitor control for hybrid type power quality conditioner

Abstract

In recent years, the voltage rise at the end of distribution line and the increase of harmonic voltages has become to be greatly concerned because of extreme expansion of distributed generation (DG) systems and excessive amount of static capacitors (SCs) for improving power factor. For compensating leading current and harmonic currents from consumers, the hybrid type of power quality conditioner was proposed. The proposed system consists of a LC series circuit, a series transformer and a self-commutated converter in order to reduce the capacity of the converter than the conventional type of static synchronous compensators (STATCOMs) and active filters (AFs). This paper presents SC bank quantity control to expand the range of the compensating current and DC bus voltage control of the converter in the hybrid type power quality conditioner. In this study, the performance evaluations for the proposed conditioner in terms of the control of the harmful currents are presented by the various simulations.