Modeling and Simulation of Dynamic Voltage Restorer (DVR) Based on Hysteresis Voltage Control

Dynamic Voltage Restorers are utilized to protect sensitive loads from voltage sags and swells which take place in the distribution systems. In this paper, a Dynamic Voltage Restorer (DVR) based on hysteresis voltage control is proposed. The DVR is modeled using Simulink´SimPowerSystem Toolbox. Discrete Fourier Transform (DFT) is used to detect the magnitude and phase jump of the voltage sag and swell. The influence of the band of the hysteresis voltage controller on the quality of the load voltage and DVR voltage is studied. The DVR is tested for three- phase voltage sag and swell with phase jump to validate the proposed control scheme.