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All Journal Jurnal Fisika Unand International Journal of Eco-Innovation in Science and Engineering (IJEISE)
Permatasari, Ayunda Wulan
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics

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Optimization of Solar Energy for Control Systems and Electrical Grid Projections at Substations Permatasari, Ayunda Wulan; Fauziyah, Nur Aini; Moch.Syaifuddin; Tanjung, Riadhi Fairuz
International Journal of Eco-Innovation in Science and Engineering (IJEISE) Vol. 6 No. 2 (2025): IJEISE
Publisher : UPN Veteran Jatim

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Abstract

This research examines the utilization of solar panels as an effort to optimize solar energy in the control systems and projections of the electrical grid at substations to support the transition to renewable energy in Indonesia. Dependence on fossil fuels, which causes high carbon emissions, and Indonesia's commitment to the Paris Agreement are the main backgrounds for this innovation. The system is designed using two 12 V solar cells connected in series to produce a 24 Vdc output, and is equipped with an automatic switching mechanism between the supply from the solar panels and National Power Plant (PLN). Observations over the course of one month showed an increase in current from 0.78 A to 1.55 A and power from 18.3 W to 38.2 W, indicating an improvement in energy conversion efficiency. However, the storage capacity significantly decreased from 35.56 Ah to 7.78 Ah, due to shorter charging durations and fluctuations in ambient temperature. This system has the potential to reduce dependence on fossil fuels, support sustainable electrification, and provide environmentally friendly electricity distribution solutions in areas not yet reached by conventional networks. Further development is needed in the energy storage aspect to enhance the overall performance of the system.
Analisis Struktur Hidroksiapatit Berbasis Cangkang Telur Ayam dengan Variasi Suhu Kalsinasi Permatasari, Ayunda Wulan; Nailul Hasan; Nur Aini Fauziyah; Allif Rosyidy Hilmi
Jurnal Fisika Unand Vol 15 No 2 (2026)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.15.2.188-196.2026

Abstract

The purpose of this study is to understand how color changes occur during the calcination heating process at different temperatures in the formation of hydroxyapatite. The synthesis process began with the calcination of CaCO_3 to CaO at temperatures of 800°C, 900°C, and 1000°C for four hours, followed by the formation of hydroxyapatite thru the calcination process of eggshell samples at temperatures of 800°C and 1000°C for 3 hours. To determine the hydroxyapatite content in the sample, characterization was performed using XRD diffraction patterns to identify the phase. XRD analysis was conducted using match2 software. Morphological analysis of hydroxyapatite was performed using SEM characterization. The analysis results indicate that there are still impurities present at temperatures of 800-800°C. The higher the calcination temperature, the greater the purity of the resulting hydroxyapatite.
Co-Authors Allif Rosyidy Hilmi Moch.Syaifuddin Nailul Hasan Nur Aini Fauziyah Nur Aini Fauziyah Tanjung, Riadhi Fairuz