Analysis of Fuzzy Based AC-AC Dynamic Voltage Restorer for Mitigation Sag

Abstract

A Dynamic Voltage Restorer (DVR) based on a matrix converter without energy storage devices is proposed to cope with voltage fluctuations. The ac/ac power converter takes energy from the grid during voltage sag/swell. By connecting the matrix converter’s input terminals on the load side and injecting the compensation voltages on the supply-side, it is possible to hold a constant input voltage, resulting in an efficient solution for compensating deep voltage sags and swells. Different solutions have been developed to protect sensitive loads against such disturbances but the DVR is considered to be the most efficient and effective solution. Its appeal includes lower cost, smaller size and its dynamic response to the disturbance. This research described DVR principles and voltage restoration methods for balanced and/or unbalanced voltage sags and swells in a distribution system.
Index Terms– Dynamic Voltage Restorer (DVR); Single Phase Matrix Converter (SPMC)