An improvement of power quality using nine-switch power conditioner with minimization of voltage sag

This paper presents a novel nine-switch integrated power conditioner in place of conventional twelve switch converter i.e. back-to-back converter for improving the power quality. In a nine-switch power converter, the suitable carrier-based pulse-width modulation technology is introduced and studied in detail. The proposed converter having some of advantages that is component saving feature, reduction of commutation, reduced semiconductor cost etc. The novelty of this proposed scheme is that middle switch of the converter is shared by the inverter and rectifier, thereby reduces the switching in compared with traditional twelve switch back-to-back converter. The control scheme is also incorporated with nine-switch converter, which is helpful for raising the power quality with minimization of voltage sag.