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All Journal International Journal of Electrical and Computer Engineering Singuda ENSIKOM ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Indonesian Journal of Electrical Engineering and Computer Science
Yulianta Siregar
UNIVERSITAS SUMATERA UTARA
Computer Science & IT Electrical & Electronics Engineering Engineering

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OPTIMAL POWER FLOW JARINGAN SUMATERA BAGIAN UTARA 150 kV Ribet Michael Simorangkir; Yulianta Siregar
Singuda ENSIKOM Vol 13, No 37 (2015)
Publisher : Singuda ENSIKOM

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (389.013 KB)

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.
Optimization Placement and Sizing of Static Synchronous Compensator YULIANTA SIREGAR; YOGA WAHYU PAMBUDI; ZULKARNAEN PANE
Jurnal Elkomika Vol 10, No 4 (2022): ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektr
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/elkomika.v10i4.846

Abstract

ABSTRAKPertumbuhan ekonomi di indonesia berbanding lurus dengan permintaan energi listrik di masyarakat yang terus meningkat. Dampaknya adalah sistem tenaga listrik akan menimbulkan berbagai masalah dalam penyaluran energi listrik, seperti drop tegangan diluar batas yang diijinkan, dan rugi rugi daya bertambah besar pada saluran. Salah satu solusi yang dapat dilaksankan untuk mengurangi masalah rugi rugi daya pada saluran dan memperbaiki profil tegangan adalah menggunakan Flexible AC Transmission System (FACTS) devices. Penelitian ini melakukan analisis Static Synchronous Compensator (STATCOM) sebagai salah satu jenis FACTS yang akan diimplementasikan pada sistem tenaga listrik Sumatera Bagian Utara (SUMBAGUT) 150 kV tahun 2020 untuk memperbaruhi profil tegangan dan meminimalisir rugi daya dengan menggunakan metode optimasi Artificial Bee Colony Hasil simulasi diperoleh bahwa pemasangan satu buah STATCOM dapat memperbaiki profil tegangan sistem yang awalnya terdapat 18 bus diluar batas yang diijinkan SPLN menjadi 5 bus. Selain itu, terjadi penurunan rugi daya aktif dari 131,40 MW menjadi 121,56 MW.Kata kunci: ABC algorithm, STATCOM, SUMBAGUT, FACTS, rugi-rugi daya, profil tegangan ABSTRACTIndonesia's economic growth is directly proportional to the increasing demand for electrical energy in society. The electric power system causes various electrical energy distribution problems, such as voltage drops outside the allowable limits, greater power losses on the line, and even unbalanced loads. One solution to the problem of power losses and improving the voltage profile is to use Flexible AC Transmission System (FACTS) devices. In this research, an analysis of Static Synchronous Compensator (STATCOM) is implemented in the 150 kV North Sumatera (SUMBAGUT) electric power system to improve the voltage profile and minimize power loss by using the Artificial Bee Colony optimization method (ABC) Algorithm. The simulation results show that installing one STATCOM can improve the system voltage profile. In addition, there was a decrease in active power loss from 131.40 MW to 121.56 MW.Keywords: ABC algorithm, STATCOM, SUMBAGUT, FACTS, power losses, voltage profile.
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.
Dynamic voltage restorer quality improvement analysis using particle swarm optimization and artificial neural networks for voltage sag mitigation Yulianta Siregar; Maulaya Muhammad; Yanuar Zulardiansyah Arief; Naemah Mubarakah; Soeharwinto Soeharwinto; Riswan Dinzi
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 Mai Kai Suan Tial Maulaya Muhammad Naemah Mubarakah Ribet Michael Simorangkir Riswan Dinzi Soeharwinto Soeharwinto Suherman Suherman Timothy Juan Hartanto Lumbanraja Wiwanto Tjumar Yanuar Zulardiansyah Arief Yasunori Tanaka YOGA WAHYU PAMBUDI Yopi Fernando Soarez Purba Zulkarnaen Pane