Advanced Power Quality Management Through a PID-Based Dynamic Voltage Restorer

Abstract

Voltage sags caused by faults in power systems pose a significant challenge to maintaining power quality and stability. This study investigates the performance of a Dynamic Voltage Restorer (DVR) equipped with a Proportional-Integral-Derivative (PID) controller in mitigating voltage sags. Simulations in MATLAB Simulink optimization demonstrate the effectiveness of DVR model in restoring nominal voltage levels during double-line-to-ground (DLG) faults. The DVR compensates for voltage sags by injecting corrective voltage, ensuring uninterrupted power delivery and stability. Analysis of input voltage and RMS voltage behavior shows a rapid recovery from a severe sag of ±100 V to nominal levels of ±325 V and 230 V RMS, respectively. The PID controller ensures smooth recovery without overshoots or oscillations, validating the precision level of the proposed model. The findings underscore the critical role in maintaining reliable power quality under fault conditions of DVR system, highlighting its potential as a robust solution for voltage sag mitigation in modern power systems.