Power Quality Improvement Using Dynamic Voltage Restorer (DVR)

Abstract

Now a day power quality problem has become a major issue to deal with, in order to maintain quality supply. Modern generation greatly depends on electrical energy for improving their life style. Modern equipment like computers, electric motors etc. cannot run without electricity. In order to improve the performance, the equipment demands quality supply The power quality is affected by various factors of the electrical network. Power quality problems such as voltage and frequency variation, harmonic contents affect the performance of electrical utility and shorten its life time. Such problem has to be compensated to ensure the quality supply. One of the most frequently occurring power quality problems in transmission network is voltage sag/swell. Such problems can cause heavy flow of current reduces the life time of the equipment or can cause over voltage affecting the insulation level of the equipment. Many modern custom devices are present in order to mitigate such problems. Among them, Dynamic Voltage Restorer (DVR) is efficient and cost effective. In this paper, an overview of DVR and control scheme used to control the DVR is presented. The simulation result with the proposed control scheme is also shown.