RESEARCH AND PARAMETER JUSTIFICATION OF AN ACTIVE HIGHER HARMONIC FILTERING SYSTEM TO IMPROVE THE ENERGY EFFICIENCY OF INDUSTRIAL ELECTROMECHANICAL COMPLEXES

Abstract

This paper addresses the analysis, mathematical modelling and parameter justification of an active power harmonic filter designed to optimise the operation of industrial electromechanical systems equipped with high-power semiconductor converters. The relevance of the study stems from the growing proportion of non-linear loads in industrial power networks, which causes voltage and current waveform distortion, additional active-power losses, transformer overheating, and premature degradation of motor insulation. Based on an analysis of non-sinusoidal operating modes, a mathematical model of a three-phase parallel-type active power filter built around a voltage-source inverter with IGBT transistors and pulse-width modulation is developed. A real-time algorithm for extracting harmonic current components, based on instantaneous power (p-q) theory, is proposed and provides high dynamic compensation accuracy. Simulation and experimental results are presented, confirming a reduction in the total harmonic distortion factor of the current from 24.6 % to 3.8 %. The technical and economic prospects of implementing active filters at industrial facilities to improve supply reliability and electromagnetic compatibility are outlined.