Harmonic Performance Assessment of a Fuzzy Controlled Grid Connected Photovoltaic Battery System

Photovoltaic System; Battery Storage; Fuzzy Logic Control; Voltage Harmonics; Total Harmonic Distortion; Power Quality.

Authors

  • Alele Jude O Department of Electrical/Electronic Engineering, Delta State University, Oleh Campus, Delta State, Nigeria.
  • Eyenubo O. J Department of Electrical/Electronic Engineering, Delta State University, Oleh Campus, Delta State, Nigeria.
  • Emmanuel E. Obuseh Department of Electrical/Electronic Engineering, Delta State University, Oleh Campus, Delta State, Nigeria.
  • Ezekiel Ebimene E Department of Electrical/Electronic Engineering, Delta State University, Oleh Campus, Delta State, Nigeria.
  • Jeffery U. Okieke Department of Electrical/Electronic Engineering, Delta State University, Oleh Campus, Delta State, Nigeria.
  • Anamonye Gabriel U Department of Electrical/Electronic Engineering, Delta State University, Oleh Campus, Delta State, Nigeria.
September 21, 2026
September 25, 2026

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This study assesses the voltage harmonic performance of a fuzzy controlled grid connected photovoltaic–battery system using harmonic results reported from a MATLAB/Simulink model. The analysis concentrates on the third, fifth, seventh and ninth harmonics and on the consistency of the reported total harmonic distortion (THD). The listed harmonic magnitudes decreased from 2.85%, 3.60%, 2.10% and 1.25% without fuzzy control to 1.20%, 1.85%, 1.10% and 0.65% with fuzzy control, respectively. Relative reductions ranged from 47.62% to 57.89%. The fifth harmonic remained the largest listed component, although its magnitude fell by 1.75 percentage points. Reported voltage THD decreased from 7.85% to 3.42%, corresponding to a 56.43% relative reduction. However, root-sum-square reconstruction from the four specified orders yielded 5.20% and 2.55%, respectively. Including the separately reported higher-order entry as an aggregate increased these estimates to 5.32% and 2.59%, leaving the reported totals unreconciled. The available evidence therefore indicates lower listed voltage harmonics with fuzzy control but does not establish a complete spectrum or standards compliance. The contribution is a focused comparison of harmonic attenuation and a transparent assessment of the spectral information required to substantiate aggregate performance.