Smart Grid Power Quality Improvement Using Modified Upqc

Abstract

This paper presents a novel power quality enhancement approach utilizing a Modified Unified Power Quality Conditioner (UPQC) integrated with an intelligent Fuzzy Logic Controller (FLC). The proposed UPQC architecture features coordinated series and shunt converters, optimized to simultaneously mitigate various power quality issues, including voltage sags/swells, harmonics, and load unbalances. Designed for modern smart grid applications, the system enhances dynamic voltage regulation and harmonic suppression through improved converter configurations and control strategies. The FLC introduces adaptive, rule-based decision-making, enabling robust performance under varying grid conditions without reliance on precise mathematical modeling. Simulation studies in MATLAB/Simulink validate the effectiveness of the proposed method, showing significant improvements in voltage stability, total harmonic distortion (THD) reduction, and overall power quality compared to traditional PI-controlled UPQC systems. This work underscores the potential of intelligent control techniques in developing resilient and efficient smart grid infrastructures.