Compensation of Voltage Sags and Swells Using Dynamic Voltage Restorer Based on Bi-Directional H-Bridge AC/AC Converter

In this paper, the compensation of voltage sags and swells using a dynamic restorer (DVR) based on bi-directional AC/AC converter is presented for stabilizing single-phase AC line voltage. The H-bridge with switches without bulk capacitor adopted as power topology proposed system. novel DVR to compensate both sag swell conditions. Additionally, factor closed unity because not required. inner outer loop control improve response gain scaling; reduce overshoot. Finally, 2 kVA prototype has been implemented verify performance accuracy method peak efficiency system up 94%, it can 50% 25% sags.