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All Journal Syntax Literate: Jurnal Ilmiah Indonesia Journal of the Civil Engineering Forum Andalas Journal of Electrical and Electronic Engineering Technology ELPOSYS: Jurnal Sistem Kelistrikan
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Sistem Monitoring Manajemen Baterai Perahu Listrik di Sayung Menggunakan Metode What If Arif Fajar Nugroho; Supari; Pinandita, Satria
Elposys: Jurnal Sistem Kelistrikan Vol. 12 No. 1 (2025): ELPOSYS vol. 12 no. 1 (2025)
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/elposys.v12i1.6638

Abstract

The price of fuel oil contributes 45% of the total operational costs of fishermen, which must be borne while operating electric passenger boats. The search for alternative sources of electrical energy, especially solar powered electric boat, is carried out as an effort to overcome this problem. In this study, monitoring using the firebase application serves as the main means of data collection. To obtain real data on the voltage and electric current in the battery, researchers used the what if approach, where the program can read the input values ​​​​from the voltage and current sensors on the battery. By using the what if method, researchers want to obtain accurate battery charging and discharging test results and a level of truth approaching 100%. From the data analysis, the results showed that when charging the battery, the highest peak point occurred from 12.00 to 13.00 with a light intensity of 168080.40 Lux, a current of 10.57 amperes and a temperature of 32.20 0 C. While when discharging the battery, the lowest voltage value occurred at minute 45 of 71.28 volts, inversely proportional to the current of 41.26 amperes. This is due to the voltage drop in the battery to supply the 4000 Watt BLDC motor.
Identifying Prolonged Zero Value Periods as Part of Quality Control on Daily Rainfall Records in East Java, Indonesia Wibawanty, Dinda Rosyia; Santikayasa, I Putu; Supari
Journal of the Civil Engineering Forum Vol. 11 No. 2 (May 2025)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.12720

Abstract

Ensuring the quality of surface rainfall records is crucial for obtaining highly representative data and facilitating further comprehensive analysis. Given that surface rainfall observations are predominantly conducted using conventional gauges, they are still susceptible to human errors that can significantly impact data quality. Among various types of errors that may arise, the issue of zero rainfall records is relatively overlooked. Prolonged zero rainfall periods may introduce uncertainty, as mistyped missing data can be erroneously replaced with zero values. The challenge in handling this issue is complicated by the absence of sufficient evidence to conclusively determine the validity or suspicion of consecutive zero rainfall periods. Therefore, we implemented the Affinity Index, altitude difference, and maximum distance approaches to detect and evaluate (validate or reject) any potential invalid sequences of prolonged zero values in the rainfall dataset. The Affinity Index quantifies the agreement of rain and non-rain events between two meteorological stations, functioning as a metric to evaluate the similarity of their rainfall patterns. Utilizing daily data from 682 rain gauge stations in East Java, Indonesia, spanning from January 2010 to December 2019, we identified two major concerns: zero rainfall accumulation during the peak of the rainy season (December/January/February) and extended dry spells lasting more than 180 days. To address the first issue, we flagged the corresponding station and excluded it from the dataset. For the second issue, we established reference stations for each target station to enable meaningful comparisons. The study found that 8.8% of stations detected zero rainfall accumulation during the peak of the rainy season. Regarding prolonged dry spells, we successfully assessed 98% of extended dry spell events in East Java. The majority of these events were considered valid, while around 3% were deemed dubious.
Pendekatan Diagnostik Dielectric Frequency Response (DFR) dan Water Content Dalam Mengidentifikasi Anomali Tan Delta yang Melebihi Standar Cigré TB 445 Pada Pengujian Transformator Daya Wijayanto, Muhammad Alvis; Supari; Nurhayati, Titik
Syntax Literate Jurnal Ilmiah Indonesia
Publisher : Syntax Corporation

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36418/syntax-literate.v10i5.58756

Abstract

Keandalan transformator daya bergantung pada kondisi isolasi, di mana tan delta >1% (CIGRE TB 445) mengindikasikan degradasi. Namun, penyebab spesifik anomali ini seringkali tidak terdiagnosis secara holistik. Tujuan dari penelitian ini adalah untuk menyelidiki penyebab tan delta tinggi melalui integrasi pengujian DFR dan water content pada transformator 80 MVA berusia 20 tahun. Pengujian tan delta (GST-g, UST), DFR, dan Karl Fischer untuk water content, diikuti analisis komparatif terhadap standar. Nilai tan delta 1,0509% disebabkan degradasi oli (water content 28,56 ppm), meskipun kertas isolasi kering (1,8%) dan konduktivitas oli optimal (4,1 pS/m). Penelitian ini menekankan pentingnya kombinasi DFR-water content untuk diagnosis akurat dan merekomendasikan purifikasi/regenerasi oli sebagai mitigasi. Temuan ini mendorong pengembangan model prediktif dan evaluasi oli alternatif dalam penelitian selanjutnya.
Optimized High-Gain DC-DC Converter for PV Applications Harmini, Harmini; Titik Nurhayati; Supari; Priyo Adi Sesotyo; Satria Pinandita; Ery Sadewa
Andalas Journal of Electrical and Electronic Engineering Technology Vol. 5 No. 2 (2025): November 2025
Publisher : Electrical Engineering Dept, Engineering Faculty, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/ajeeet.v5i2.179

Abstract

Photovoltaic (PV) systems frequently encounter low and fluctuating output voltages, which can significantly impede efficient energy utilization and necessitate more advanced power conversion solutions. Addressing this challenge, the study aims to develop a high-gain DC-DC converter topology that offers stable voltage regulation, making it suitable for PV applications. The proposed solution targets the essential need for substantial voltage boosting while maintaining reliable performance even under varying solar irradiance conditions. The core of the design is based on a Quadratic Boost Converter (QBC) integrated with Voltage Multiplier Cells (VMC), collectively referred to as QBC-VMC. This innovative configuration enhances the voltage gain capability compared to traditional converters. To ensure precise control of the output voltage, a Proportional-Integral (PI) controller is implemented. The system undergoes thorough analysis, including detailed modeling, simulation, and the design of its control structure, to optimize performance. The results demonstrate that the proposed converter can achieve a voltage gain of up to 12 times the input voltage. The PI controller effectively maintains a stable output voltage at approximately 600 V with a tolerable variation of ±0.7%. Additionally, the system exhibits an energy conversion efficiency approaching 81%, even under fluctuating irradiance conditions. This indicates a strong dynamic response and steady-state performance, essential for reliable PV operation. By integrating QBC-VMC with PI control, the proposed approach significantly enhances voltage stability and energy conversion efficiency. Overall, this system provides a promising solution for high-performance PV power systems, capable of delivering reliable power output under varying environmental conditions.
Co-Authors Arif Fajar Nugroho Ery Sadewa Harmini, Harmini Priyo Adi Sesotyo Santikayasa, I Putu Satria Pinandita Satria Pinandita Titik Nurhayati Titik Nurhayati Wibawanty, Dinda Rosyia Wijayanto, Muhammad Alvis