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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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Dynamic voltage restorer performance analysis using fuzzy logic controller and battery energy storage system for voltage sagging Siregar, Yulianta; Azhari Nasution, Azrial Aziz; Suan Tial, Mai Kai; Mubarakah, Naemah; Soeharwinto, Soeharwinto
International Journal of Electrical and Computer Engineering (IJECE) Vol 14, No 2: April 2024
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijece.v14i2.pp1215-1227

Abstract

Power quality is a major issue in the power transfer process. This is caused by disturbances such as voltage sags, voltage spikes, and harmonics. Voltage sag is the most common disturbance in the electric power system. However, the dynamic voltage restorer (DVR) is the most effective device for voltage sags. This research uses the DVR to overcome voltage sags using fuzzy logic controller (FLC) and battery energy storage system (BESS) to improve the performance of the DVR. The results showed that DVR using FLC improved the quality of voltage recovery compared to BESS because FLC injected a greater voltage of 0.0991 pu than BESS.
Distribution network reconfiguration utilizing the particle swarm optimization algorithm and exhaustive search methods Siregar, Yulianta; Jaya Tambun, Tomi Saputra; Panjaitan, Sihar Parlinggoman; Tanjung, Kasmir; Yana, Syiska
Bulletin of Electrical Engineering and Informatics Vol 13, No 2: April 2024
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/eei.v13i2.6206

Abstract

The load level for each period in the distribution network can be considered non-identical due to the increasing demand for loads and the bigger distribution network. The main problem in the transmission and distribution network system is power losses and voltage profiles, affecting the quality of service and operating costs. This study compares the reconfiguration of the network using exhaustive search techniques and particle swarm optimization (PSO) algorithms on the IEEE 33 bus distribution network system. The study’s results compare the study of power flow before and after network reconfiguration, which is a decrease in the value of power losses from 202.7 kW to 139.6 kW. Then voltage profile improved from 91.309% to 93.782%. The simulation results also found that this reconfiguration can improve the system voltage profile, which initially contained 21 buses outside the standard limits of IEEE Std 1159-1995 to 7 buses.
PERBANDINGAN METODA DIFFERENTIAL EVOLUTIONARY ALGORITHM DENGAN LAGRANGE MULTIPLIER PADA OPTIMISASI ECONOMIC DISPATCH Dinzi, Riswan; Siregar, Yulianta; Siregar, Melinda Zubara
Jurnal Media Elektro Vol 12 No 2 (2023): Oktober 2023
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/jme.v12i2.12317

Abstract

In power plant operation, the highest cost is the cost of fuel, so it is necessary to optimize the Economic Dispatch (ED), which aims to analyze the economic operation of the thermal generator by performing simulation calculations to obtain optimal power and more economical generator operating costs. In this thesis, ED optimization is carried out using the Differential Evolutionary Algorithm (DEA) method at the Pangkalan Susu PLTU. The DEA method is validated with the Lagrange Multiplier method. DEA simulation results are not much different from the Lagrange Multiplier method. The results of the fuel cost comparison using the DEA method are more economical than the fuel costs for the Pangkalan Susu PLTU. In this thesis, the author takes a sample load data of 4 units of Pangkalan Susu PLTU in February 2021. The simulation results of the DEA method for load data for February 2021 produce an average cost savings of 3,111.64 US$/h with a saving percentage of 14, 01%. The lowest average fee is on February 1, 2021, for 17,108.68 US$/d, while the highest average fee is on February 21, 2021, for 20,478.61 US$/h..
Optimization Placement and Sizing of Static Synchronous Compensator SIREGAR, YULIANTA; PAMBUDI, YOGA WAHYU; PANE, ZULKARNAEN
ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Vol 10, No 4: Published October 2022
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 starting a three phase induction motor using direct on-line, variable frequency drive, soft starting, and auto transformer methods Siregar, Yulianta; Rotua Oktaviana Siahaan, Yosephine; Nabila Binti Mohamed, Nur; Candra Riawan, Dedet; Yuhendri, Muldi
Indonesian Journal of Electrical Engineering and Computer Science Vol 37, No 2: February 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v37.i2.pp700-714

Abstract

The problem with 3-phase induction motors is that when starting the motor, the motor starting current can reach five to seven times the nominal current. This research compares slip, starting current, bus voltage, acceleration torque, motor torque, energy savings, and kVAR from the direct on-line (DOL), variable frequency drive (VFD), soft starting, and autotransformer starting methods in the electrical transient analyzer program (ETAP) software. This research result shows that the fastest VFD slip reaches a steady state, namely at 11+ seconds. The lowest starting/starting current is owned by the VFD method, namely <20% full load amps (FLA) in the first 2 seconds. The lowest decrease in bus voltage at steady state was experienced by the VFD method, namely 0.8152%. The quickest acceleration torque reaches a steady state in the VFD method, namely in 11+ seconds. The soft starting method owns the lowest starting torque, namely 20.75%. The soft starting method has the largest energy savings, namely 148.02 kW. Of the several variables observed, the best starting method is the VFD method.
Overcurrent effects on copper insulated PVC cables and fire resistance via thermal imaging and macrostructure analysis Ali Akbar, Muhammad; Humaidi, Syahrul; Tarigan, Kerista; Ramdan, Dadan; Frida, Erna; Siregar, Yulianta
Bulletin of Electrical Engineering and Informatics Vol 14, No 2: April 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/eei.v14i2.8628

Abstract

This study investigates the effects of overcurrent on copper (Cu) insulated polyvinyl chloride (PVC) cables, focusing on their thermal behavior and fire resistance. We utilized thermal imaging, macrostructural analysis, and Joule heating calculations to evaluate six cable samples subjected to various currents. Results showed that with increasing current, the temperature of the cables rose significantly. For example, the CC0 sample, with no current, had a temperature of 36 °C, while the CC110 sample, subjected to 110 A, reached 1,091 °C. Joule heating calculations indicated energy values ranging from 0 J for the CC0 sample to 7,260,000 J for the CC110 sample. Physical observations included minor deformations at 253 °C and complete insulation loss at 1,091 °C. These findings emphasize the critical need for managing overcurrent to prevent severe cable damage and enhance system safety. This research provides practical insights for optimizing cable design and improving thermal management, offering valuable contributions to electrical engineering practices.
Comparison design of dynamic voltage restorers, distribution static compensators and unified power quality conditioner series shunts on voltage sag, and voltage swell Siregar, Yulianta; Mubarok, Syahrun; Mohamed, Nur Nabila
International Journal of Electrical and Computer Engineering (IJECE) Vol 15, No 2: April 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijece.v15i2.pp1396-1410

Abstract

One issue with the power system is electrical power quality, which is brought on by short circuit disruptions and growing nonlinear loads. Power systems frequently have short circuits, resulting in voltage sags that can harm delicate loads. Voltage sage and swell issues can be resolved using unified power quality conditioner series shunts (UPQC-S), distribution static compensators (DSTATCOM), and dynamic voltage restorers (DVR). Custom power devices are very useful in overcoming problems with electrical networks. In this research, due to 3-phase short circuit faults, voltage sag and swell simulations were conducted using a load equal to 70% of the total load and a fault location point of 75% of the feeder length, from the results of research conducted with the case study PT. PLN (Persero) UP3 Sibolga Feeder SB 02 shows that DVR performs better than DSTATCOM and UPQC-S in handling voltage sag and voltage swell due to 3-phase short circuit disturbances. The DVR succeeded in providing the largest voltage sag recovery in phase C, increasing the voltage from 0.2481 pu to 0.9776 pu. The DVR is also effective in overcoming voltage swell on phase A, reducing it from 1.724 pu to 0.9969 pu.
Comparative analysis of active filters, inductor-capacitor and inductor-capacitor-inductor passive filters in reducing harmonics Siregar, Yulianta; Azhari, Naomi; Mohamed, Nur Nabila
International Journal of Electrical and Computer Engineering (IJECE) Vol 15, No 3: June 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijece.v15i3.pp2567-2582

Abstract

Control equipment at substations requires a rectifier to convert alternative current (AC)-direct current (DC) electric current to provide DC power for relays, motors for disconnector switches and power breaker switches, and telecommunications equipment. Rectifiers have non-linear load characteristics, which can result in a waveform that is not pure sinusoidal due to the interaction of fundamental frequency sinusoidal waves with other waves known as harmonics. Therefore, to not interfere with the equipment's work, a filter is needed to reduce the harmonics produced by the rectifier. In this research, using MATLAB/Simulink, prevention was carried out using active filters, inductor-capacitor (LC), and inductor-capacitor-inductor (LCL) passive filters (Ta, Tc, and Td designs) separately. After the research was carried out, it was found that the amount of harmonics before installing the filter was 49.61%. Then, after installing the active filter, the harmonics were reduced to 0.29%, the installation of the passive LC filter was reduced to 9.29%, and the installation of the LCL filter (Ta, Tc, and Td) became 1.44%, 0.29%, and 1.44%.
Generator analysis and comparison of working fluids in the organic Rankine cycle for biomass power plants using Aspen Plus software Siregar, Yulianta; Sihotang, Wahyu Franciscus; Mohamed, Nur Nabila
International Journal of Applied Power Engineering (IJAPE) Vol 14, No 2: June 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijape.v14.i2.pp467-478

Abstract

The organic Rankine cycle utilizes low-temperature heat (flue heat) in power plants to produce electrical power. Several factors, including the working fluid's temperature and pressure, influence the efficiency of an organic Rankine cycle. This research method includes calculations using the gasification method in calculating electrical energy in PLTBM and calculating the experimental results of a series of organic Rankine cycles by taking into account the temperature and pressure of the working fluid using Aspen Plus Software, which is analyzed using statistical methods. The results of research using the gasification method in PLTBM fuel produced power of 27,279.38 MW/year for coconut shells, 6,489.66 MW/year for rice husks, and 532.62 MW/year for corn cobs. For the organic Rankine cycle series, rice husk waste produces the largest power of 8,336.67 kW, for coconut shells of 569,723.95 kW. For corn cobs of 358,639.63 with an efficiency value of organic working fluid in R-22 of 25.37% and the R-32 organic working fluid of 11.92% at a temperature of 125 °C in coconut shell waste, it can be concluded that the temperature of the working fluid has more influence on the efficiency of the organic Rankine cycle than the pressure of the working fluid.
Electrostatic precipitator design with wire-cylinder electrodes as a particulate matter reduction Siregar, Yulianta; Debataraja, Bio; Soeharwinto, Soeharwinto; Mubarakah, Naemah; Dinzi, Riswan
Indonesian Journal of Electrical Engineering and Computer Science Vol 32, No 1: October 2023
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v32.i1.pp21-32

Abstract

Small industries are inseparable from the production of gaseous pollutants. One of the contents of exhaust gases produced from small industrial activities is particulate matter. The consequences of exposure to particulate matter for too long are coughing, cancer, blood coagulation, and death. For this reason, a tool is needed to capture particulate matter in small industrial exhaust gases. Based on the problems described, this research proposes using the electrostatic precipitator with the cockroft-walton method because this method is very effective in capturing particulate matter. The research results on electrostatic precipitator (ESP) with a pair of electrodes will achieve an efficiency of 25.4% when the voltage regulator is 20 V, while the efficiency is 98.7% when the voltage regulator is 35 V. The ESP with two pairs of electrodes will achieve 99.5% efficiency when the voltage regulator is 30 volts. Installing a vibrator as a particle thresher at the electrode is unsuitable for low-temperature exhaust gases because it produces a liquid and sticky residue that makes it difficult to fall off.
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 Kivander Saragi, Agus 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 Ngamroo, Issarachai 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