Power Quality Enhancement Using a Fuzzy Logic-Based Shunt Active Power Filter with Instantaneous Power Theory
Year: 2026
Type: article
Abstract: The rapid growth of power electronic converters and other nonlinear loads has made current harmonics, poor power factor and reactive power burden the dominant power quality problems in modern distribution networks. This paper presents a three-phase shunt active power filter (SAPF) in which the reference compensating currents are extracted using the instantaneous reactive power (p-q) theory and the DC-link capacitor voltage is regulated by a Mamdani-type fuzzy logic controller (FLC) in place of the conventional proportional-integral (PI) controller. The fuzzy controller uses the DC-link voltage error and its change as inputs, with seven linguistic sets per variable and a 7 × 7 rule base of 49 rules. A hysteresis current controller generates the gating pulses of the IGBT-based voltage source inverter. The complete system, supplying a three-phase diode bridge rectifier load from a 50 Hz grid, is modelled in MATLAB/Simulink. The total harmonic distortion (THD) of the source current falls from 25.80% without compensation to 4.64% with the PI-controlled SAPF and to 1.45% with the fuzzy-controlled SAPF, well within the IEEE 519 limit of 5%. The fuzzy controller also settles the DC-link voltage at its 740 V reference without overshoot, whereas the PI controller leaves a steady offset of about 5 V.
Institution: RKDF University
Language: English
Topic: Power Quality and Harmonics
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W7223259759