Finite Impulse Response Filter–Based Active Power Filter for Harmonic Reduction in a 33 KV Power Line
Year: 2026
Type: article
Abstract: This paper presents the design and implemen-tation of a finite impulse response (FIR) fil-ter–based shunt active power filter for har-monic reduction in a 33 kV distribution pow-er line supplying nonlinear industrial loads. The increasing use of power electronic–based equipment in medium-voltage networks in-troduces significant harmonic distortion, lead-ing to poor power quality and non-compliance with established standards. To address this challenge, an FIR filter–based control strategy is proposed for accurate har-monic extraction and reference current gener-ation in an active power filtering system. A detailed model of a practical 33 kV distribution network was developed in the MATLAB/Simulink environment, incorporating nonlinear load characteristics representative of industrial applications. The FIR filter was designed to suppress the fundamental frequency component and selectively ex-tract harmonic currents, which were used to generate compensating current references for a voltage source inverter–based shunt active power filter. The system performance was evaluated under both uncompensated and compensated operating conditions using time-domain and frequency-domain analyses. Simulation results demonstrate that the pro-posed FIR-based active power filter effective-ly mitigates harmonics and improves overall power quality. The source current total harmonic distortion was reduced from 17.77% in the uncompensated system to 0.87% after compensation, achieving full compliance with IEEE 519 harmonic limits. In addition, significant improvements in current wave-form quality and power factor were observed. The results confirm that FIR filter–based active power filtering provides a stable, accurate, and robust solution for harmonic mitigation in medium-voltage distribution systems.
Authors: P. C. Ene, I. G. Anyanwogor, U. H. Onwuha
Institution: Enugu State University of Science and Technology
Language: English
Topic: Power Quality and Harmonics
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W7212364764