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Sofyan Sofyan
Balai Riset dan Standardisasi Industri Padang
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Journal : Jurnal Teknologi Elekterika

 1 
GENETIC ALGORITHM-BASED OPTIMIZATION OF DISTRIBUTED GENERATOR PLACEMENT IN DISTRIBUTION NETWORKS TO MINIMIZE POWER LOSSES An-Nizha, Nurul; Sofyan, Sofyan; Sultan, Ahmad Rizal; Bachtiar, Muh. Imran; Muhammad, Umar; Arni, Sitti
Jurnal Teknologi Elekterika Vol. 21 No. 2 (2024)
Publisher : Jurusan Teknik Elektro Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/elekterika.v21i2.5101

Abstract

An increase in electrical energy can lead to an increase in power losses and a decrease in voltage in the system. One of the efforts made to reduce power losses that occur in the distribution network is by placing the optimal Distributed Generation (DG) in the right location. Installation of DGs with suboptimal capacity and placement location can result in greater active power losses and further reduce voltage stability. This study discusses the optimization of DG placement in the electric power distribution network using genetic algorithm methods that are known to be effective in solving complex optimization problems. The IEEE 33 bus distribution system, which is a standard system frequently employed in power flow research, was the subject of the case study. The Newton-Raphson method is a commonly used iterative method for power flow analysis due to its accuracy in calculating power flow in electrical networks. The research findings indicate that the most suitable location for two DG units with an injection power of 6,626 MW is on buses 3 and 4. The placement of this DG has the potential to substantially mitigate power losses within the distribution network. The placement of two DG units on buses 3 and 4 results in a more significant improvement in system power losses than the placement of DG units on other buses. Power losses of buses 3 and 4 experienced power losses of 67724.69 MW, while system losses were reduced by 1137621.21 MW, or 5.61 percent.
Assessment of wind power plant performance using turbine performance and power curves: a case study of PLTB TOLO I Jeneponto Sofyan, Sofyan; Idris, Ahmad Rosyid; Latif, Muh. Ardiansyah; Thaha, Sarma; Asri, Andarini; Thahir, Muhammad; Sidehabi, Sitti Wetenriajeng
Jurnal Teknologi Elekterika Vol. 21 No. 2 (2024)
Publisher : Jurusan Teknik Elektro Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/elekterika.v21i2.5116

Abstract

Jeneponto Regency in South Sulawesi possesses significant wind potential, making it an ideal location for the development of Wind Power Plants (WPP). However, these WPPs are intermittent due to the inconsistent nature of wind energy, presenting challenges that affect the performance and efficiency of turbines in generating electricity. Therefore, this study aims to evaluate the performance of the SWT-3.6-130 wind turbines at the Tolo 1 WPP in Jeneponto to determine their capability in converting wind energy into electrical energy at specific wind speeds. The evaluation results indicate that the performance of the SWT-3.6-130 wind turbines at the Tolo WPP in February 2022 was not optimal. The maximum output power generated by these turbines approached the maximum capacity of 3.6 MW, with Turbine 06 producing 3.57 MW at a wind speed of 13.07 m/s, Turbine 09 producing 3.57 MW at a wind speed of 12.27 m/s, and Turbine 013 producing 3.58 MW at a wind speed of 12.11 m/s. Although the power generated was close to the maximum capacity, the performance variation among turbines indicates the need for further evaluation to address factors reducing efficiency. Power coefficient analysis shows that Turbine T13 exhibited the best performance, with the fewest instances of power coefficient values not meeting standards. This study provides crucial insights for improving performance and preventing failures at the Tolo WPP in the future.
MEDIUM VOLTAGE INSULATOR CRACK DETECTION USING MOBILENetV2 AND TENSORFLOW Yani, Ahmad; Sofyan, Sofyan; Lukman, Musfirah Putri; Usman, Usman; Junaidi, Apri
Jurnal Teknologi Elekterika Vol. 22 No. 1 (2025)
Publisher : Jurusan Teknik Elektro Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/elekterika.v22i1.5420

Abstract

This study discusses the detection of medium voltage insulator cracks using object detection technology. This study uses medium voltage ceramic insulator image data at the ULP Daya Waste Material Warehouse. Ceramic insulator image data is categorized into good and damaged conditions. Preprocessing involves labeling, dividing train data, validation, and testing, and exporting data to Pascal VOC format. MobileNetV2 is implemented on Google Collab to train the object detection model. The evaluation of the model accuracy is in the COCO matrix, while the performance graph shows that the model can read objects well because the reading curve is in line with the smooth curve. Furthermore, this model is applied in creating an Android application that uses the device's camera to detect objects in real-time. This application processes images, converts from YUV to RGB, and performs object detection using the trained model. The detection results are displayed with bounding boxes and labels on the camera reviewer, namely the good class with a reading value of 1.0, the damaged class with a reading value of 0.67 and the background 1.0. This application also tracks detected objects and updates the display according to the detection results.
OPTIMIZATION OF SLACK BUS PLACEMENT DURING PEAK LOAD BY CONSIDERING THE VOLTAGE PROFILE OF THE GENERATION BUS IN THE SULSELRABAR ELECTRICITY SYSTEM Hamzah, Muhammad Aqmal Muslimin; Sofyan, Sofyan; Sultan, Ahmad Rizal; Bachtiar , Muhammad Imran
Jurnal Teknologi Elekterika Vol. 22 No. 1 (2025)
Publisher : Jurusan Teknik Elektro Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/elekterika.v22i1.5425

Abstract

This study was carried out to determine the best slack bus placement during peak loads by considering the voltage profile of the generator buses in the South Sulawesi electricity system. Analysis was performed to determine the optimal slack bus placement and its impact on the bus voltage profile. South Sulawesi's electric power system is made up of 29 power-generating units, including PLTA, PLTU, PLTG, PLTGU, PLTMH, PLTD, and PLTB, that operate at a voltage of 150 kV. In addition, 56 substations are linked via a 150 kV transmission network. This study relies on daily operational data from the South Sulawesi system at peak load on September 16, 2022. Using Matlab's Newton-Raphson method to simulate power flow, five scenarios are used to alternately change the generator bus (PV bus) into a slack bus; the generators are PLTA Bakaru, Punagaya PLTU, Jeneponto PLTU, Sengkang PLTU, and Poso PLTA. After running simulations for each generator, it was discovered that Poso PLTA had the voltage profile closest to the standard set by the Minister of Energy and Mineral Resources Regulation number 20 of 2020, which ranges between 0.90 and 1.05 pu. In comparison to the other four slack buses, it had the lowest total power loss of 120,743 MW and 593,764 MW MVAR.
ESTIMATION AND MINIMIZATION OF HARMONICS IN IEEE 13 BUS DISTRIBUTION SYSTEM WITH ADJUSTABLE SPEED DRIVE LOADS USING PASSIVE FILTERS Nureni, Nureni; Sofyan, Sofyan; Akhmad, Satriani Said; Naim, Kurniawati; Fitiati, Andi; Sanjaya, Lari Andres
Jurnal Teknologi Elekterika Vol. 22 No. 1 (2025)
Publisher : Jurusan Teknik Elektro Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/elekterika.v22i1.5424

Abstract

Improving power quality in electrical distribution systems is increasingly important with the increasing use of nonlinear loads, such as Adjustable Speed Drive (ASD), which can produce harmonies. This harmonic has the potential to damage equipment, reduce system efficiency, and interfere with power quality. Distribution systems such as IEEE 13 Bus are often used for power quality management analysis. Through simulation, researchers can identify the source and impact of harmonics and evaluate solutions, such as the application of passive filters that absorb or divert harmonic currents, to reduce their negative effects in the distribution system. In this study, two power sources, several transformers, static loads, and nonlinear loads in the form of Adjustable Speed Drive (ASD) were used. The simulation was carried out using Simulink R2019b to model the distribution network, generators, transformers, and loads. The simulation results show that the Adjustable Speed Drive (ASD) load can produce a total harmonic current distortion (THDi) of 24.62% in bus 7, while the total harmonic voltage distortion (THDv) is 0.97%. To minimize harmonic values, passive filters with variations of RL, RC, LC, and RLC are used. The results show that the use of RL passive filters is more effective in reducing THDi and THDv values in bus 7 by 24.47% and 0.97%.
Co-Authors A Hadi Arifin Abdi Wijaya, Abdi Abdul Rahman Abdul Rosyid Abdul Wahab Achmad, Alamsyah Adibrata, Sudirman Adoma, Prince Owusu Adriyansyah, Nico Agung Febrianto, Agung Agung Nugroho Agus Widyantoro Ahamad Rizal Sultan Ahmad Afiif, Ahmad Ahmad Fudholi Ahmad Humam Hamid Ahmad Nayan Ahmad Rosyid ahmad yani Akbar, Arham Hafidh Akhmad Habibi Akhmad Habibi, Akhmad Akhmad, Satriani Said Akhyari, Azki Al Haditzy, Ihzurt Aldia, Dia Alfit, Muh Ali Sadikin Ali, Raden Alimron, Alimron aljufri aljufri, aljufri Alqodri, Muhammad Faris Alvianingsih, Salma Amin, Syahril Amirul Mukminin Amrial, Amrial An-Nizha, Nurul Andi Sahri Alam Andre Mustofa Meihan Angelia, Fera Anggita, Tiara Angriyani, Silma Animah Animah Anizar Anizar Annisa, Syarifa Anugrah, Abdi Apri Junaidi, Apri Aprillitzavivayarti, Aprillitzavivayarti AR, Marzuki Arif Firmanyah Aris Triwiyatno Arman Maiwa Arni, Sitti Asia, Siti Nur asri, andarini Aulia, Zuriatul Auri, Christina Tyas Justipava Awaludin , Dipa Teruna Bachtiar , Muhammad Imran Bachtiar, Muh. Imran Baids, Fajrin Bakar, Bakar Bashir, Ashadi Baso Akib Bau Toknok Bayu Prasetyo, Bayu Boby Syefrinando Boymau, Inyel Suhadertia Budi Setiawan Catherine, Yustiana Citra Ayu, Citra Citra Rosalyn Anwar Connery B, Irene Jane Danola Padang, Astri Daulay, Hermalina David Sarana Deassy Siska Dedi Dedi Dedy Afrizal Denny Denmar Dewi Tamara Dewi, Leolita Clara Puspita Dhiaul, Asyraf Dila Erlianti Dimas Agung Saputra Dyah Erti Idawati, Dyah Erti Eddy Haryanto Efendi, Muhammad Ichsan Eko Kuntarto Ervan, Ervan Erviana, Evi Evitulistiono, Rizki Failisnur, Failisnur Faiz Muqorrir Kaaffah Fajar Sidik Fasmadhy Satiadharmanto, Deddi fatimah Fatimah Febrianto Febrianto, Febrianto Ferizal, Jemi Firman Aziz Firman Firman Firmansah, Firmansah Fitiati, Andi Fitriana, Afriani Fridiyanto, Fridiyanto Fuad, Zakiul Ginting, Ledy Mahara Giyai, Nomensen Gunawan, Muhammad Safaat Gunawan, Robi Hadi Sirad, Mochammad Apriyadi Hafizah, Adisti Hamka Hamka, Hamka Hamzah, Muhammad Aqmal Muslimin Hansein Arif Wijaya Hartini, Dewi Sri Hary Soedarto Harjono Haryanto , Eddy Hasibuan, Indiriyani Haykal, Muhammad Hendra Pribadi Hendra Raza Hendra, Robi Hendri Hendri Herdiansah, Arief Heritawati, Ayunia Herman Fithra Hidaya, Fathul Hijeriah, E Maznah Hulu, Amati Eltriman Idrus, Muhammad Izzdin Ikhsan Darmawan Ilham Ilham Indra Indra Indra Mawardi Indrayani, Lilis Irwan Irwan Iskandar, Imran Ismail Ismail Istiqamah, Nurul Istiqomah, Heni Jamaludin . Juanda Juanda Judijanto, Loso Kartika Megawati Khaidil, Khaidil Khairullah, Khairullah Khairunnisa, Fitri Khurota'ayun, Khusna Komarullah, Umam Krismo, Alan La Wungo, Supriyadi Ladiva, Ladiva Lareke, Amir A Lari Andres Sanjaya Latif, Adam Latif, Muh. Ardiansyah Leni Maulinda, Leni Leppang, Irmawati Lestari , Agus Lestari, Agus Lisa, R Litna Nurjannah Ginting Lolita, Ristiani Lubis, Hendarman Lukman Hakim Lukman, Musfirah Putri M. Kurniawan, M. Mahdianto, Mahdianto Maizuar Maizuar Malik, Rahmalia Mamlukah , Mamlukah Mardewi, Mardewi Maulana, Eka Mawa, Daefitul Mayatopani, Hendra Megawati, Merti Meriatna Meriatna MILASARI, LISA ASTRIA Mirzania, Ira Misrah Misrah Muh. Rapi Muhammad Adam, Muhammad Muhammad Ikhwan Mardin MUHAMMAD MAHATIR Muhammad Nuzan Rizki Muhammad Safri, Muhammad Muhammad Sofwan Muhammad Syaifullah, Muhammad Muhammad Thahir Muhammad Yusuf Muhtadin Muhtadin Mujahidah, Nurul Mukhlis Mukhlis Mukhlish Hidayat Muliansyah, Dadah Mulya A, Muh Alyan Muslem Muslem, Muslem Mustanir, Ahmad Naim, Kurniawati Nasrun Nasrun Nasution, Fahrizal Nathania, F Nita, Nur Noor Fuad, M Nur Asia, Siti Nur Azizah Nurdiansyah, Muh. Nureni, Nureni Nurhidayah, Rika Nurmalita Nurmalita Nurrachmah, Elly Ode, Wahyuni L. Parulian, Pahala Pasaribu, Munawir Patmisari, Patmisari Pratama, Robin Priyadi, Catur Priyadi, Catur Puspita, Veny Puteh, Anwar Putra M, Hilton Tarnama Putra, Reza Putra, Riqky Ananda Qamal Qamal Rahman, KA Rahmatullah, Andi Muhammad Ridha Rahmawati, Nur Fitri Rahmi, Ulfa Rayandra Ashyar Reza Muttaqin, Reza Muttaqin Rizky, Sarvina Fitri Robi Soma Roeslan, Akhyar Rukmana, Siti Rusman, Ismaun Safira, Nadila Saiba, Derki Dibor Saleh, Husna Sandri, Sandri Sangka, Yuliana Sapari, Norazliani MD Sapriyadi, Wandi Saputra, Jumadil Sari, Dyan Prawita Sari, Helvi Mei Sari, Nur Intan Komala SAUDAGAR, FERDIAZ Sella Mawarni Serlly, Serlly Shafwan, Muhammad Shaliza, Fara Sirajuddin Sirajuddin Siregar, Nasyariah Siti Nandiroh Sitti Wetenriajeng Sidehabi Sodikin, Nur Solle, Muchtar Salam Sopialena . Sudirman, Feby Dehmi Sugesti, Nadzua Widya Sukarna, Ayuni Sukma, Melati Sulfianah Sulistiyo, Urip Suryadi, Andi Suryana, Edy Susanto, Agung Susianto Susianto SYAHRIAL SYAHRIAL Syatar, Abdul Syukur Umar Takahashi, Makoto Tangdibiri, Yakub Taufik, Muh Bambang Tersta, Friscilla Wulan Thaha, Sarma Tonapa, Jennis Towansiba, Esau Ulfa, Raudhatul Umar Muhammad Umar, Kusnadi Usman Usman Usman Usman Wahyu Adi Wardy Putra, Trisno Wesli Wesli Wibowo Heru Prasetiyo Widiati, Bibiana Rini Wilyanti, Liza Septa WINDA TRISNAWATI Wulandari, Bunga Ayu Yammes J. Batkunde Yani, Firda Tirta Yarkuran, Nuru Yesy Afrillia Yusuf, Nuraini Yuwarti, Harti Yuwarti, Harti Zahra, Puji Febrian Zikri, Irfan Zulkarnain Zulkarnain Zurweni Zurweni