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All Journal International Journal of Electrical and Computer Engineering International Journal of Applied Power Engineering (IJAPE) Singuda ENSIKOM Bulletin of Electrical Engineering and Informatics Teknika: Jurnal Sains dan Teknologi ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Science and Technology Indonesia Jurnal Teknika Jurnal Media Elektro : Journal of Electrical Power, Informatics, Telecommunication, Electronics, Computer and Control System Indonesian Journal of Electrical Engineering and Computer Science
Yulianta Siregar
Jurusan Teknik Elektro, Fakultas Teknik, Universitas Sumatera Utara
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Physics

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Daya Output Optimal pada Jenis Solar Cell Monocrystalline dan Plycrystalline Yehzekiel, .; Siregar, Yulianta; Helmi, Hasdari; Syahrawardi, .; Afron, .
TEKNIKA Vol 11, No 2 (2015): Desember
Publisher : Fakultas Teknik Universitas Sultan Ageng Tirtayasa

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Abstract

Penelitian ini membahas penggunaan solar cell yang optimal dengan menggunakan 2 Jenis solar cell 100 Wp yaitu Monocrystalline dan Polycrystalline dan dilakukan di gedung Departement Teknik Elektro, Universitas Sumatera Utara, pada bulan oktober 2015. Jenis Monocrystalline menggunakan sudut kemiringan solar cell 0°-60°, sementara jenis Polycrystalline menggunakan reflektor (Cermin) dengan sudut reflektor 50°, 60°, 70°. Hasil daya output optimal yang diperoleh untuk Monocrystalline adalah sebesar 100 Watt, pada jam 12.00 WIB dengan sudut kemiringan reflektor 60° dan sudut kemiringan solar cell 10°.
Daya Output Optimal Pada Jenis Solar Gell Monocrystalline dan Polycrystalline Yulianta Siregar; Hasdari Helmi; Syahrawardi Syahrawardi; Afron Afron; Yehezkiel Yehezkiel
Jurnal Teknika Vol 11, No 2 (2015): Edisi November 2015
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/tjst.v11i2.6647

Abstract

Penelitian ini membahas penggunaan solar cell yang optimal dengan menggunakan 2 jenis solar cell 100 Wp yaitu Monocrystalline dan Polycrystalline dan di lakukan di gedung Departement Teknik Elekltro, Universitas Sumatera Utara, pada bulan Oktober 2015. Jenis Monocrystalline menggunakan sudut kemiringan solar cell 0o60", sementara jenis Polycrystalline menggunakan reflektor (Cermin) dengan sudut reflektor 50', 60' dan 70'. Hasil daya output optimal yang di peroleh untuk Monocrystalline adalah sebesar 100 Watt, pada Jam 12.00 WIB dengan sudut kemiringan solar cell 10'dan berada pada posisi sudut azimuth matahari, sedangkan unfuk Polycrystalline daya output optimal sebesar 100 Watt , pada jam 12.00 WIB dengan sudut kemiringan reflektor 60" dan sudut kemiringan solar cel 10".
OPTIMAL POWER FLOW JARINGAN SUMATERA BAGIAN UTARA 150 kV Ribet Michael Simorangkir; Yulianta Siregar
Singuda ENSIKOM Vol 13, No 37 (2015)
Publisher : Singuda ENSIKOM

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Abstract

Sistem interkoneksi tenaga listrik memerlukan pola operasi pengaturan pembangkitan daya pada unit-unit generator dan penyaluran daya menuju titik-titik beban. Pengoperasian unit-unit pembangkit tersebut diusahakan agar bekerja dengan biaya operasi yang murah tanpa mengabaikan aspek keamanan dan kualitas pada sistem tersebut. Biaya Pembangkitan  yang murah dapat diperoleh dengan melakukan economic dispatch pada unit-unit pembangkit tersebut. Aspek keamanan dan kualitas sistem ketenaga listrikan dipenuhi dengan menggunakan metode Optimal Power Flow. Aspek keamanan tersebut meliputi batasan besar daya yang dapat dibangkitkan masing-masing pembangkit dan kapasitas pembebanan pada saluran. Sedangkan aspek kualitas meliputi batasan tegangan pada tiap-tiap bus. Pada tulisan ini metode Optimal Power Flow diaplikasikan pada sistem kelistrikan PT. PLN (Persero) Sumatera Bagian Utara 150 kV. Studi OPF dilakukan melalui simulasi dengan menggunakan Power Sistem Analisis Toolbox (PSAT) yang menggunakan primal dual interior point method (PDIPM). Hasil pengoptimalan aliran daya yang dilakukan pada sistem kelistrikan PT. PLN (Persero) Sumatera Bagian Utara adalah turunnya biaya pembangkitan sistem sebesar Rp. 342.152.567,37 per jam atau 15,42% dari biaya pembangkitan pada pola pengoperasian PT. PLN Sumatera Bagian Utara dan pola pengoperasian yang tidak keluar dari batasan-batasan yang diizinkan.
Design of solar cell using mirror, cooling, double axis, and solar tracking Yulianta Siregar; Mai Kai Suan Tial; Yopi Fernando Soarez Purba; Suherman Suherman; Soeharwinto Soeharwinto
Indonesian Journal of Electrical Engineering and Computer Science Vol 28, No 3: December 2022
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v28.i3.pp1297-1308

Abstract

Fossil energy sources are dwindling. It is necessary to develop alternative energy sources for future energy. The solar cell is an alternative energy that can be used in Indonesia. The current challenge is utilizing solar panels for the best possible power production. This research gives the solution to design an increase in solar cell output power by using mirrors, cooling, and a double-axis solar tracking control system. The results show that using a mirror, cooling, and double-axis solar tracking produces optimal output power with a current and power are 2.43 amperes and 40.3 watts, respectively. Meanwhile, several factors can affect this solar panel's efficiency. Specifically, the amount of solar radiation that the solar panel can receive depends on the climate on the day and location of the research and the solar panel's dimensions.
Protection coordination analysis applied at biogas power generation plant Yulianta Siregar; Wiwanto Tjumar; Naemah Mubarakah; Riswan Dinzi
Indonesian Journal of Electrical Engineering and Computer Science Vol 30, No 1: April 2023
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v30.i1.pp1-13

Abstract

Biogas from liquid waste from palm oil processing, palm oil mill effluent (POME), can be utilized in biogas power plants as a source of renewable energy (PLTBg). The PLTBg electrical system is equipped with a coordinated protection system. Then, the protection system must also maintain the continuity of electrical service in parts that are not affected by disturbances. Coordination of the protection system is essential. In this research, the electrical transient analysis program (ETAP) carries out the short circuit current analysis, and the coordination of overcurrent protection is constructed from its inverse-definite minimum time characteristics. The analyzed data contributed to selecting the right protection devices. A combination of overcurrent protection, directional protection, and frequency protection change rate supported a reliable electrical power system for a biogas power generation plant as distributed generation. The result shows that modern microprocessor-based protection relays support several protection features in one device and can be integrated into a supervisory control and data acquisition (SCADA)-controlled protection system to enhance their capabilities.
Analysis of interference methods on transformers based on the results of dissolved gas analysis tests Yulianta Siregar; Timothy Juan Hartanto Lumbanraja
International Journal of Electrical and Computer Engineering (IJECE) Vol 13, No 4: August 2023
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijece.v13i4.pp3672-3685

Abstract

In the operation of the power transformer, several maintenance efforts must be made to ensure the condition of the transformer is in good condition. The problems that usually arise are a thermal failure and electrical failure. The use of insulating media such as transformer oil and transformer insulation paper can be disrupted by this failure. Dissolved gas analysis, which identifies the types and concentrations of dissolved gas in transformer oil, can reveal details on fault indicators in power transformers (DGA). In this study, we used the interpretation of the IEEE std 2008-C57.104 (total dissolved combustible gas (TDCG), key gas, Rogers ratio method), the interpretation of IEC 2015-60599 (Duval triangle and basic gas ratio method), and the IEEE Std 2019-C57.104 interpretation (Duval pentagon method). The outcome of the DGA test is used to determine the conditions and indications of disturbances in the transformer for power. Using various gas analysis techniques also impacts the outcome of the fault indication. This variation has affected the types of gas used in the computation and the gas concentration limit value estimation. After the gas analysis, it was found that the oil purification process was also proven to reduce the concentration of combustible gases.
Numerical analysis in Ar-H2 coupled-coil inductively coupled thermal plasma with Si feedstock for stable operation Yulianta Siregar; Yasunori Tanaka
International Journal of Electrical and Computer Engineering (IJECE) Vol 13, No 4: August 2023
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijece.v13i4.pp3695-3705

Abstract

In nanopowder synthesis, the starting powder to be evaporated is infused in a plasma torch through the upper coil and the lower coil in the coupled model of inductively coupled thermal plasma (coupled-coil inductively coupled thermal plasma (ICTP)). Mixing these evaporated materials to form the coupled ICTP significantly influences the thermodynamic and transport properties. It is essential to understand these complex interactions between coupled ICTP and feedstock evaporation. This research investigated the thermal interactions between silicon raw material powder (Si) with ICTP in coupled 99%Ar/1%H2 through the numerical model developed for the synthesis of Si nanopowder. The feed rate of the Si raw material was set at 0.05, 0.1, and 0.5 g/min. This implies that the increased Si feed is too heavy to vaporize all the injected feed.
Electromigration Effects in Overcurrent PVC-Insulated Copper Wire: Failure and Deformation Impacts Akbar, Muhammad Ali; Tarigan, Kerista; Humaidi, Syahrul; Ramdan, Dadan; Siregar, Yulianta
Science and Technology Indonesia Vol. 9 No. 3 (2024): July
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2024.9.3.735-744

Abstract

Electromigration is a critical issue in materials science and electrical engineering, significantly impacting the reliability and efficiency of electrical systems. This study investigates the electromigration behavior of PVC-insulated copper wires under various overcurrent conditions, focusing on material degradation and electrical performance. Copper cables, identified as 046620.3 Eterna CU/PVC 1.5 mm2, were subjected to currents ranging from 0 to 110 A. The mean time to failure (MTTF) was calculated using Black’s equation, revealing a sharp decline in MTTF with increasing current density. Surface morphology analysis using SEM showed the formation of voids and hillocks at higher currents, indicating severe electromigration damage. XRF analysis demonstrated significant changes in the elemental composition, particularly a reduction in copper content and an increase in chlorine and other elements, suggesting degradation of the PVC insulation. FTIR spectroscopy revealed substantial chemical changes in the PVC material, especially under extreme overcurrent conditions, highlighting dehydrochlorination and carbonyl group formation. There is a clear relationship between overcurrent conditions and electromigration phenomena, as evidenced by the observed damage to surface morphology, changes in elemental composition, and alterations in the chemical structure of PVC. The mechanisms and causes of electromigration are explained comprehensively in this work, illustrating how increased overcurrent accelerates the electromigration process, leading to the formation of voids and hillocks in the copper conductor. This damage is accompanied by a significant reduction in copper content and an increase in chlorine levels, indicating the degradation of PVC insulation. FTIR spectra further confirmed these findings by showing chemical changes such as dehydrochlorination and carbonyl group formation under high current stress. The MTTF values reflect the severity of these impacts, with samples exposed to higher currents showing drastically reduced lifespans. For instance, samples subjected to 100 A and 110 A currents exhibited MTTF values of 0.2 minutes and 0.004 minutes, respectively.
Comparative design of harmonic current reduction in variable speed drive using space vector pulse width modulation and hybrid pulse width modulation Siregar, Yulianta; Situmeang, Farel; Mohamed, Nur Nabila
International Journal of Electrical and Computer Engineering (IJECE) Vol 14, No 5: October 2024
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijece.v14i5.pp4907-4920

Abstract

In industry and commerce, three-phase induction motors are frequently utilized as the primary power source for machinery. However, to increase motor performance efficiency, induction motors also need a tool for speed control. The variable speed drive (VSD) is one tool used to control the rotation speed of three-phase induction motors. Since VSD is a non-linear load, harmonic distortion will result from it. The space vector pulse width modulation (SVPWM) injection method and the hybrid pulse width modulation method were the two techniques employed by the author in this study to lower the current in the VSD. With the SVPWM injection approach, the variable speed drive's current total harmonic distortion (THD) values in the R, S, and T phases dropped to 3.77%, 3.53%, and 2.19% from 7.14%, 7.17%, and 7.58%.
Dynamic voltage restorer quality improvement analysis using particle swarm optimization and artificial neural networks for voltage sag mitigation Siregar, Yulianta; Muhammad, Maulaya; Arief, Yanuar Zulardiansyah; Mubarakah, Naemah; Soeharwinto, Soeharwinto; Dinzi, Riswan
International Journal of Electrical and Computer Engineering (IJECE) Vol 13, No 6: December 2023
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijece.v13i6.pp6079-6091

Abstract

Power quality is one of the problems in power systems, caused by increased nonlinear loads and short circuit faults. Short circuits often occur in power systems and generally cause voltage sags that can damage sensitive loads. Dynamic voltage restorer (DVR) is an efficient and flexible solution for overcoming voltage sag problems. The control system on the DVR plays an important role in improving the quality of voltage injection applied to the network. DVR control systems based on particle swarm optimization (PSO) and artificial neural networks (ANN) were proposed in this study to assess better controllers applied to DVRs. In this study, a simulation of voltage sag due to a 3-phase short-circuit fault was carried out based on a load of 70% of the total load and a fault location point of 75% of the feeder’s length. The simulation was carried out on the SB 02 Sibolga feeder. Modeling and simulation results are carried out with MATLAB-Simulink. The simulation results show that DVR-PSO and DVR-ANN successfully recover voltage sag by supplying voltage at each phase. Based on the results of the analysis shows that DVR-ANN outperforms DVR-PSO in quality and voltage injection into the network.
Co-Authors . Afron, . . Syahrawardi, . . Yehzekiel, . Afron Afron Aliakbar, Muhammad Azhari Nasution, Azrial Aziz Azhari, Naomi Candra Riawan, Dedet Dadan Ramdan Debataraja, Bio Erna Frida Hasdari Helmi Hasdari Helmi, Hasdari Jaya Tambun, Tomi Saputra Kasmir Tanjung, Kasmir Mai Kai Suan Tial Mohamed, Nur Nabila Mubarok, Syahrun Muhammad Ali Akbar, Muhammad Ali Muhammad, Maulaya Muldi Yuhendri Nabila Binti Mohamed, Nur Naemah Mubarakah Naemah Mubarakah PAMBUDI, YOGA WAHYU Ribet Michael Simorangkir Riswan Dinzi Riswan Dinzi Rotua Oktaviana Siahaan, Yosephine Sihar Parlinggoman Panjaitan Sihotang, Wahyu Franciscus Siregar, Melinda Zubara Situmeang, Farel Soeharwinto Soeharwinto Soeharwinto Soeharwinto, Soeharwinto Suan Tial, Mai Kai Suherman Suherman Syahrawardi Syahrawardi Syahrul Humaidi, Syahrul Syiska Yana Tarigan, Kerista Timothy Juan Hartanto Lumbanraja Wiwanto Tjumar Yanuar Zulardiansyah Arief Yasunori Tanaka Yehezkiel Yehezkiel Yopi Fernando Soarez Purba Zulkarnaen Pane