Paper Title
Modified Dynamic Voltage Restorer used for Power Quality Issues at Distribution Side of Electrical Sectors

Abstract
This paper presents a review on power quality issues which affecting the performance of electrical distribution scenario either through voltage distortions or because of critical loads. The control of power quality issues is highly required to reduce total harmonic distortion, voltage sag or swell with proper investigation of their behavior to provide a better solution for power quality problems. In this research review Dynamic Voltage restorer (DVR) is proposed with a modified version which proposes better control and improved performance with respect to designed electrical distribution system. For transformation of voltages, the synchronous reference frame is used and reference load is assessed through unit vectors. A new controller technique is developed to reduce the error between the reference and actual DVR voltages which is regulated by using proportional– integral (PI) and fuzzy based controllers. Using MATLAB/SIMULINK platform the prosed modelled is reviewed for 3-phase supply and 3-phase critical loads in addition to series injected transformers. Keywords - Power Quality, DVR, SRF Theory, BESS, Electrical Distribution System.