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All Journal CYCLOTRON Jurnal Teknologi Electrices : Jurnal Otomasi Kelistrikan dan Energi Terbarukan International Journal of Electrical, Computer, and Biomedical Engineering (IJECBE)
Fitri, Ismi Rosyiana
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Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Medicine & Pharmacology

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Formulation of the Optimization Problem for Unit Commitment with Price Elasticity-Based Demand Response Sijabat, Monika Leonita Srikarina; Fitri, Ismi Rosyiana
International Journal of Electrical, Computer, and Biomedical Engineering Vol. 2 No. 3 (2024)
Publisher : Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62146/ijecbe.v2i3.78

Abstract

Integrating Demand Response (DR) programs into the Unit Commitment (UC) problem is a promising method to enhance the efficiency and reliability of power systems. This work introduces a new formulation that incorporates price elasticity into the UC problem using a relaxed optimization approach. Our objective is to maximize overall system performance by reducing generation costs and maximizing the utility function while accounting for how demand changes in response to electricity prices, i.e., price elasticity-based DR. The proposed model employs Mixed-Integer Linear Programming (MILP) techniques to efficiently solve the UC problem, using a linear function to model price elasticity-based DR. Our approach has demonstrated its effectiveness in achieving substantial cost reductions and improved load management, as shown through numerical simulations.
Optimisasi Integrasi Economic Dispatch dan Dynamic Automatic Generation Control Tambun, Laura Agnes; Fitri, Ismi Rosyiana; Ardita, I Made; Hudaya, Chairul
Jurnal Teknologi Vol. 12 No. 1 (2024): Jurnal Teknologi
Publisher : Universitas Jayabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31479/jtek.v12i1.352

Abstract

Abstrak Dengan penetrasi Energi Terbarukan (ET) yang besar dalam era transisi energi, ada potensi tantangan teknis terkait frekuensi sistem kelistrikan. Oleh karena itu, diperlukan mekanisme kontrol yang dapat memastikan bahwa frekuensi sistem tetap berada dalam batas operasional yang aman. Terkait hal tersebut dibutuhkan model hierarkis ED-AGC guna menjaga performa kerja sistem dengan tetap mempertahankan sisi ekonomis dari operasi sistem. Economic Dispatch (ED) digunakan untuk meminimalkan biaya pembangkitan dan cadangan sistem, sedangkan Automatic Generation Control (AGC) untuk menjaga frekuensi sistem tetap pada nilai sinkron dan menjaga keseimbangan energi di setiap area kontrol. Penelitian ini berfokus pada modifikasi optimasi AGC dari sudut pandang ekonomi dengan menggabungkan ED ke dalam AGC secara. Dibandingkan dengan penelitian sebelumnya, model yang diusulkan telah memasukkan Generation Rate Control (GRC) pada governor. Keywords: Economic dispatch, dynamic automatic generation control, generation rate control, multisource
Economic Optimality of Automatic Generation Control in a Multi-Source Power System Using an Optimization Problem Approach Tambun, Laura Agnes; Fitri, Ismi Rosyiana
International Journal of Electrical, Computer, and Biomedical Engineering Vol. 3 No. 1 (2025)
Publisher : Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62146/ijecbe.v3i1.79

Abstract

Due to the incorporation of a high penetration of renewable energy resources into power generation, recent power system control strategies have combined economic dispatch (ED) and automatic generation control (AGC) to achieve economic operation. To this end, AGC parameters and control laws have been designed to optimize operation through the use of optimization approaches. Although existing studies indicate that the proposed AGC optimal control strategy offers superior performance compared to traditional AGC, the models used in these theoretical frameworks are typically dominated by a single energy source, such as a steam-turbine generator. Additionally, the models in existing studies do not consider the ramp generation constraints present in practical implementations. In this paper, we propose an algorithm to obtain the optimal AGC parameters to consider a more realistic power system with diverse sources. Numerical simulations are used to demonstrate the effectiveness of the proposed method.
Lightning Performance Design Review of 150kV Overhead Transmission Line Hakim, Fakhri; Fitri, Ismi Rosyiana; Widyanto, Aji Nur
International Journal of Electrical, Computer, and Biomedical Engineering Vol. 3 No. 2 (2025)
Publisher : Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62146/ijecbe.v3i2.122

Abstract

Lightning overvoltage constitutes the predominant cause of transmission line interruptions in Indonesia, significantly compromising system safety and reliability. This paper presents comprehensive simulations of lightning performance on 150kV overhead transmission lines using ATP-EMTP software, with particular focus on evaluating shielding failure and back flashover occurrences on one of the standard tower designs used by PT PLN (Persero). The transmission line model incorporates shielding wires, phase conductors, tower surge impedance, current-dependent footing resistance behavior, and arcing horns. Simulations were conducted to investigate three key aspects: maximum shielding failure current based on various Electrogeometric Model (EGM) constants, the impact of footing resistance on critical flashover current, and the effect of arcing horn length variations on critical flashover current. The analysis also accounts for phase angle variations in system voltage. Results highlight the significant influence of these variables on the Lightning Flashover Rate (LFR) of existing tower designs. Increasing footing resistance from 10Ω to 20Ω elevates Back Flashover Rate (BFOR) by 16.39%, while further increases to 30Ω and 40Ω yield only marginal increases of 17.33% and 17.76%, respectively. Notably, arcing horn gap length modifications demonstrate substantial performance improvements, with 1.4m and 1.5m gaps reducing LFR by 17.37% and 30.87%, respectively, compared to the 1.3m reference configuration. Analysis of maximum shielding-failure currents across varying EGM coefficient sets indicates that shield wires fail to intercept currents in the range of 2.53 kA to 52.81 kA.
Optimisasi Parameter AGC (Automatic Generation Control) Pada Sistem Tenaga Listrik Fitri, Ismi Rosyiana; Aryani, Dwi Riana
Electrices Vol 7 No 1 (2025): Volume 7 Nomor 1 Tahun 2025
Publisher : Jurusan Teknik Elektro, Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/ees.v7i1.7440

Abstract

Dengan meningkatnya integrasi sumber energi terbarukan dalam sistem pembangkitan listrik, strategi kontrol sistem tenaga kini semakin berkembang dengan menggabungkan masalah economic dispatch (EDP) dan automatic generation control (AGC) guna mencapai operasi yang lebih efisien secara ekonomi. Dalam studi ini, kami mengusulkan suatu algoritma baru yang dapat menentukan parameter AGC yang optimal dalam segi biaya pembangkitan. Untuk mengevaluasi efektivitas pendekatan ini, simulasi numerik menggunakan MATLAB diterapkan guna menganalisis performa metode yang diusulkan dalam berbagai skenario operasional dan jenis sumber energi. Simulasi numerik menunjukkan bahwa algoritma baru yang diusulkan dapat menghasilkan operasi yang handal dalam meregulasi deviasi frekuensi. Selain itu, biaya operasi yang dihasilkan lebih kecil rata-rata 0,3% dibandingkan dengan biaya yang dihasilkan dengan parameter AGC pada sistem.
Reliability Assessment of Interconnected Substations Using the Reliability Block Diagram Approach Hermoyo, Ganis; Fitri, Ismi Rosyiana; Widyanto, Aji Nur
International Journal of Electrical, Computer, and Biomedical Engineering Vol. 3 No. 3 (2025)
Publisher : Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62146/ijecbe.v3i3.123

Abstract

The reliability of substations plays a crucial role in maintaining the continuity and stability of power supply in transmission systems. This study evaluates the reliability level of two interconnected 150 kV substations using the Reliability Block Diagram (RBD) approach. The RBD model is applied to map the actual component configuration, from major component levels to the system level, based on operational age and component failure rate data. Simulation results show that System1 has a reliability value of 0.907735, while System2 reaches 0.979424. This discrepancy indicates a potential for reliability improvement through component rejuvenation strategies. A scenario simulating the replacement of critical equipment successfully increased the reliability of system1 to 0.980168 and raised the overall reliability of the interconnected system to 0.959989. These findings suggest that a prioritized maintenance or renewal of component strategy targeting critical component can significantly enhance the overall reliability of the transmission system.
Evaluasi Sistem Proteksi Petir Eksternal pada Bangunan Pusat Perbelanjaan Studi Kasus Gedung XYZ Mahira, Athaya; Widyanto, Aji Nur; Husnayain, Faiz; Fitri, Ismi Rosyiana
CYCLOTRON Vol 7 No 02 (2024): CYCLOTRON
Publisher : Universitas Muhammadiyah Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30651/cl.v7i02.23283

Abstract

Sustainable Development Goals (SDGs) adalah 17 tujuan global yang disusun oleh Perserikatan Bangsa-Bangsa untuk mengatasi berbagai tantangan global seperti kemiskinan, degradasi lingkungan, perdamaian, dan perubahan iklim. Salah satu tujuannya adalah poin 11, "sustainable cities and communities," yang bertujuan membuat kota dan pemukiman manusia inklusif, aman, tangguh, dan berkelanjutan. Indonesia, dengan iklim tropisnya, rentan terhadap hujan petir yang bisa menyebabkan kerusakan elektronik, cedera, kematian, dan kebakaran. Dengan Indeks Kerawanan Petir (IKL) 45%, Jakarta adalah salah satu kota dengan risiko tinggi terhadap petir, sehingga penting untuk mengevaluasi sistem proteksi petir pada bangunan perkotaan. Salah satu bangunan yang banyak di Jakarta merupakan bangunan pusat perbelanjaan. Penelitian ini menganalisis risiko pada salah satu bangunan pusat perbelanjaan di Jakarta, Gedung XYZ, yang dilakukan berdasarkan standar nasional dan internasional. Sistem proteksi petir eksternal yang terpasang adalah Early Streamer Emission (ESE). Evaluasi dilakukan berdasarkan standar NF C 17-102 dengan fokus pada terminal udara, konduktor penyalur, dan sistem pentanahan. Empat skenario perbaikan area proteksi terminal udara ditawarkan: penggeseran, penambahan, penggantian batang penangkal, dan aplikasi sistem konvensional. Perbaikan sistem grounding melibatkan pemasangan ground ring electrode atau penambahan elektroda pentanahan di setiap sistem terminasi tanah.
Co-Authors Ardita, I Made Aryani, Dwi Riana Hakim, Fakhri Hermoyo, Ganis Hudaya, Chairul Husnayain, Faiz Mahira, Athaya Sijabat, Monika Leonita Srikarina Tambun, Laura Agnes Widyanto, Aji Nur