Enhanced Dynamic Voltage Restorer (DVR) with Fuzzy Logic Control for Voltage Regulation

Abstract

Three-phase Dynamic Voltage Restorer (DVR) utilizing a Fuzzy Logic Controller (FLC) to improve power quality in electrical distribution systems. The DVR is designed to protect sensitive loads from voltage sags, swells, and harmonics by monitoring voltage levels and injecting compensating voltages to ensure a stable and reliable power supply. The system includes a three-phase supply connected to a transformer, with the DVR placed after the transformer to mitigate voltage disturbances. The fuzzy logic controller adjusts the DVR output based on reference and load voltage measurements, providing efficient voltage compensation. The proposed DVR system achieves 95 % efficiency in correcting voltage disturbances and reduces total harmonic distortion to 2.41 %. Simulation results validate the effectiveness of the FLC-based DVR demonstrating faster response times and minimal steady-state error compared to traditional controllers. This integration enhances voltage regulation and fault resilience, making it a valuable contribution to renewable energy and power electronics fields, highlighting the potential of advanced control techniques in improving grid-connected system performance. The FLC-based DVR reduces voltage sag to 0.68 % and response time to <0.5 msec. The simulation for this research was carried out using MATLAB Simulink Optimization.