Designing of Dynamic Voltage Restorer (DVR) to Improve the Power Quality for Restructured Power Systems

Abstract

In Restructured power systems, Power quality is one of the major concerns in the present era. The problem of harmonics, voltage sags and swells and its major impact on sensitive loads are well known. To solve this problem, custom power devices are used. One of those devices is the Dynamic Voltage Restorer (DVR), which is one of the most efficient and effective modern custom power devices used in power distribution networks for the power quality improvement. Control of power quality problems involves cooperation between network operator (utility), customer and equipment manufacturer. A Dynamic Voltage Restorer (DVR) is a distribution voltage DC-to-AC solid-state switching converter that injects three single phase AC output voltages in series with the distribution feeder and in synchronism with the voltages of the distribution system. A DVR is interface equipment between utility and customer connected in series between the supply and load to mitigate the three major power quality problems, namely the harmonics, voltage sags, and swells etc. This paper concentrates on the designing of Dynamic Voltage Restorer (DVR) for the harmonics compensation so that it can improve the Power Quality (PQ).