Harmonic mitigation in grid-integrated renewable energy systems with nonlinear loads

Zakaria Reguieg, Ismail Bouyakoub and Fayçal Mehedi

Energy, 2025, vol. 324, issue C

Abstract: This study addresses the power quality (PQ) challenges associated with integrating renewable energy sources (RES), particularly photovoltaic and wind systems, into the electrical grid with nonlinear loads (NLs). The study focuses on the implementation and performance of the Unified Power Quality Conditioner (UPQC), which comprises series and shunt Active Power Filters connected by a DC link, to mitigate these harmonic distortions. MATLAB Simulink were used to evaluate the UPQC's effectiveness under various scenarios, including normal operation, NL variations, unbalanced NL, and unbalanced NL variations. Fault analysis was performed under 20 % unbalanced voltage sag and swell. The final test involved highly NLs with a total harmonic distortion (THD) exceeding 55 %. The results demonstrate that THD current values range from 1.66 % to 2.23 %, decreasing from more than 55 % to under 5 % in all cases. Additionally, the UPQC mitigates harmonic voltages, reducing them from 9.80 % to 1.7 %, and achieves a reduction of 77.56 % in voltage harmonics and 72.22 % in current harmonics, compared to existing methods. The system also stabilizes the load voltage during fault scenarios. This study provides a comprehensive approach to harmonic mitigation, enhancing PQ and ensuring grid stability in systems integrating RES with NL.

Keywords: Renewable energy integration; Harmonic mitigation; Unified power quality conditioner (UPQC); Nonlinear loads; Power quality; Grid stability (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:324:y:2025:i:c:s0360544225015245

DOI: 10.1016/j.energy.2025.135882

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