Dynamic Voltage Restorer for Enhancing Distribution Systems Power Quality

This paper introduces modeling and analysis of dynamic voltage restorer DVR to enhance the distribution system power quality in terms of mitigation of voltage sag and swell that occurs due to power system faults such as three phase fault, line to line fault, single line to ground fault and double line to ground fault. The DVR device is designed for each phase instead of one DVR for three- phase to study the different faults. The DVR of each phase is controlled using PWM technique and the conventional PI controller to eliminate the voltage sag and swell. The DVR device with distribution system is simulated using Matlab/Simulink package. The simulation results of DVR prove the effectiveness and powerful of proposed DVR with each phase in sense fast response of voltage restoring after power system faults.