Analisis Stabilitas Frekuensi Sistem Panas Bumi PT. Geo Dipa Energi (Persero) dengan Defense Scheme Co-Optimization PFR-UFLS

Santoso, Dimas Budi (2026) Analisis Stabilitas Frekuensi Sistem Panas Bumi PT. Geo Dipa Energi (Persero) dengan Defense Scheme Co-Optimization PFR-UFLS. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penelitian ini membahas analisis stabilitas frekuensi pada sistem kelistrikan PLTP Dieng Unit 1 PT Geo Dipa Energi (Persero) yang memiliki kapasitas terpasang sebesar 60 MW dan terhubung dengan sistem interkoneksi Jawa–Madura–Bali (Jamali). Tujuan penelitian adalah menganalisis respons frekuensi sistem akibat beberapa gangguan dengan membandingkan karakteristik Primary Frequency Response (PFR) pada governor. Simulasi dilakukan menggunakan perangkat lunak DIgSILENT PowerFactory 2024 dengan metode simulasi dinamis Root Mean Square (RMS). Penelitian dilakukan pada tiga skenario gangguan, yaitu grid lepas (grid islanding), generator lepas (generator trip), dan hubung singkat tiga fasa pada terminal Hot Well Pump. Pada skenario grid lepas digunakan dua kondisi operasi generator, yaitu 48 MW sebagai kondisi operasi utama dan 24 MW sebagai analisis sensitivitas. Masing-masing kondisi dibandingkan menggunakan pengaturan governor droop 5% dan droop 4%. Hasil penelitian menunjukkan bahwa perubahan nilai droop dari 5% menjadi 4% menghasilkan respons frekuensi yang lebih baik, ditunjukkan dengan nilai steady-state yang lebih mendekati frekuensi nominal dan waktu pemulihan yang sedikit lebih cepat setelah terjadi grid lepas. Pada skenario generator lepas, frekuensi sistem turun hingga 49,48 Hz akibat hilangnya pembangkitan, sedangkan pada skenario hubung singkat tiga fasa, pelepasan beban oleh Overcurrent Relay (OCR) menyebabkan frekuensi mengalami overshoot akibat surplus daya setelah gangguan dibersihkan. Berdasarkan hasil tersebut dapat disimpulkan bahwa karakteristik governor berpengaruh terhadap respons frekuensi sistem, sedangkan sistem proteksi membantu menjaga keberlangsungan operasi setelah terjadi gangguan.
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This study analyzes the frequency stability of the electrical auxiliary power system at PLTP Dieng Unit 1, PT Geo Dipa Energi (Persero), which has an installed capacity of 60 MW and is interconnected with the 150 kV Java–Madura–Bali (Jamali) grid. The objective of this study is to evaluate the system frequency response under several disturbance conditions by comparing the performance of the Primary Frequency Response (PFR) through different governor droop settings. Dynamic simulations were carried out using DIgSILENT PowerFactory 2024 based on the Root Mean Square (RMS) simulation method. Three disturbance scenarios were investigated, namely grid disconnection (grid islanding), generator trip, and three-phase short-circuit fault at the Hot Well Pump terminal. For the grid disconnection scenario, two generator operating conditions were evaluated, namely 48 MW as the normal operating condition and 24 MW as a sensitivity analysis. Each operating condition was simulated using 5% droop as the existing governor setting and 4% droop as the tuned setting. The simulation results show that reducing the governor droop from 5% to 4% improves the frequency response by producing a steady-state frequency closer to the nominal value and a slightly shorter settling time following grid islanding. In the generator trip scenario, the system frequency decreased to 49.48 Hz due to the sudden loss of generation. Meanwhile, in the three-phase short-circuit scenario, load disconnection by the Overcurrent Relay (OCR) caused a temporary frequency overshoot due to power surplus after the fault was cleared. Overall, the results indicate that the governor characteristics significantly influence the system frequency response, while the protection system contributes to maintaining system operation following severe disturbances.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Droop Governor, Grid Lepas, Pembangkit Listrik Tenaga Panas Bumi, Respons Frekuensi Primer, Stabilitas Frekuensi. =========================================================== Frequency Stability, Geothermal Power Plant, Governor Droop, Grid Islanding, Primary Frequency Response.
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK1007 Electric power systems control T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK1010 Electric power system stability. Electric filters, Passive. T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK1318 Geothermal Power Plants
Divisions:	Faculty of Intelligent Electrical and Informatics Technology (ELECTICS) > Electrical Engineering > 20201-(S1) Undergraduate Thesis
Depositing User:	Dimas Budi Santoso
Date Deposited:	29 Jul 2026 03:18
Last Modified:	29 Jul 2026 03:18
URI:	http://repository.its.ac.id/id/eprint/139396

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