An integrated series active power filter combined with a PV-battery system based on a fuzzy logic controller to enhance power quality for various linear and non-linear loads

Introduction. Rapid capacity development and the incorporation of new loads are adding complexity to the distribution power system. As a result, the distribution system faces additional power quality issues, particularly with increasingly sensitive equipment and distributed generation. Problem. Modern power systems face escalating power quality degradation due to non-linear loads. Voltage disturbances (sags, swells) and harmonic distortions directly affect the sensitive equipment, causing significant economic losses. The goal of this work is to design, model, and evaluate series active power filters (SAPFs) integrated with energy management for an independent solar storage system, using a multi-stage DC-DC converter. The objective focuses on mitigating voltage harmonics and grid disturbances resulting from diverse loads (linear, non-linear, and combined) and integrating renewable energy (PV). Control is achieved through an intelligent fuzzy logic controller (FLC) and a PI controller to ensure a stable DC voltage and reduce the total harmonic distortion (THD) of the voltage to less than 5 %. Methodology. This study models and analyzes a unique SAPF configuration integrated with a PV-battery storage system utilizing MATLAB/Simulink. Outcomes of the proposed control, wherever the FLC regulates the DC-link voltage reference signals utilize the instantaneous reactive power theory. The suggested methodology entails simulation studies across four scenarios: an analysis of performance to keep voltage components and a comparison of the proposed SAPF performance with existing research on linear, non-linear, and combined loads. Results. Simulation results show the effectiveness of the control approach in mitigating the voltage THD level to less than 5 % under various operating conditions that included the main supply voltage and loads, which satisfies the international PQ standards (IEEE Std. 519). The scientific novelty lies in the combination of a new 3-phase SAPF with a PV-battery system by FLC and a cascaded DC/DC converter. This allows effective voltage disturbance and harmonic compensation in various load situations without conventional transformers. Practical value. This research offers a robust solution for power quality problems in modern grids, reducing losses by ensuring stable, no-distortion power for sensitive industrial loads across varied operating conditions. References 46, tables 3, figures 19.