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    Directly power system harmonics estimation using Equilibrium Optimizer
    (Elsevier Science Sa, 2024) Coban, Melih; Saka, Mustafa
    In power systems, the frequency values of current and voltage signals are expected to be at the fundamental frequency. Harmonic components may occur due to the effect of non-linear loads. Accurate estimation of harmonic components is important in determining the precautions to be taken. In this study, Equilibrium Optimizer (EO) based harmonic estimator has been proposed and applied to solve the harmonic and sub/inter-harmonic estimation problems. In addition to estimation amplitude, phase and frequency, unlike the literature, DC offset decaying values of power signals have been estimated with proposed method. Most common used synthetic stationary signals and dynamic signal with different noisy levels have been used in order to shown effectiveness. From the outputs, it has been seen that the proposed method gives high resolution results and has an impressive performance even if the parameters of the harmonics increase and/or the harmonics have high SNR levels. Moreover, obtained results indicate the EO-based estimator can robustly and accurately estimate all unknown or specified parameters of the harmonics simultaneously with high accuracy and higher resolution.
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    Extraction efficacy of newly designed electric fields on red beetroot samples
    (Elsevier, 2024) Coban, Melih; Turker, Damla Nur; Fidan, Murat; Evrendilek, Gulsun Akdemir
    A newly designed voltage treatment chamber for AC electric field application with high voltage transformer, voltage divider, over current limiter, and vacuum treatment chamber was utilized to treat red beetroot samples by 0.00 - 11.5 kV, 400 - 1013 mbar, and 18.15 - 20.00min. Applied processing parameters caused a significant increase in the total antioxidant capacity. The best-fit multiple (non-) linear regression models with response optimization revealed 4.6 kV, 400 mbar, and 30.90% moisture as the most optimal processing parameters with 0.8313 composite desirability. Application of electric fields may be utilized for the electroporation of the plant tissue without adverse effect on important properties.