Performance Evaluation of Hybrid Power Filters under Unbalanced and Distorted Voltage Conditions

Abstract

The proliferation of non-linear loads in modern power systems has escalated power quality concerns, primarily due to harmonic currents and reactive power demands. While Hybrid Power Filters (HPF)—combining the cost-effectiveness of passive filters with the precision of active filters—offer a promising solution, their performance often degrades under non-ideal grid conditions. This paper presents a comprehensive performance evaluation of a shunt hybrid power filter specifically designed to operate under unbalanced and distorted supply voltage conditions. A robust control strategy, based on Clark Transformation [p-q Theory], is employed to ensure accurate harmonic extraction despite the presence of negative-sequence components and background harmonics in the grid. The study utilizes MATLAB/Simulink simulations and experimental validation to analyze Total Harmonic Distortion (THD) and power factor correction across varying load levels.