ANALISIS OPERASI GENERATOR BERDASARKAN VARIASI TEGANGAN GRID DAN TINGKAT PEMBANGKITAN PADA SISTEM KELISTRIKAN PLTP X BERBASIS STUDI ALIRAN DAYA

Liemalasintasari, . (2026) ANALISIS OPERASI GENERATOR BERDASARKAN VARIASI TEGANGAN GRID DAN TINGKAT PEMBANGKITAN PADA SISTEM KELISTRIKAN PLTP X BERBASIS STUDI ALIRAN DAYA. Skripsi thesis, Universitas Pembangunan Nasional Veteran Jakarta.

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Abstract

The generator at Geothermal Power Plant (PLTP) X operates in parallel with a 150 kV transmission network, making its operating conditions susceptible to grid voltage variations. This study analyzes the effect of grid voltage variation and generation levels on generator reactive power output (Qgen), terminal voltage, power factor, the operating point position relative to the Generator Capability Curve (GCC), and the effectiveness of Automatic Voltage Regulator (AVR) setpoint adjustment as an operational mitigation measure. Power flow simulations were conducted using ETAP software with the Newton-Raphson method across 16 initial operating scenarios combining four grid voltage levels (135, 142.5, 150, and 157.5 kV) and four generation levels (25%, 50%, 75%, and 100%), supplemented by 8 AVR setpoint mitigation scenarios. Results show that all scenarios at a grid voltage of 135 kV produced a GCC margin of 0.000 MVAr across all generation levels, with the operating point located exactly at the Over Excitation Limiter boundary. Increasing generation levels reduced the maximum reactive power capability from 39.158 MVAr at 25% to 28.078 MVAr at 100%, indicating that higher active power output narrows the available operating region on the GCC. Increasing the AVR setpoint by +3% proved ineffective in altering the generator operating condition, whereas reducing the AVR setpoint by −5% successfully increased the GCC margin to 16.285, 14.216, 10.272, and 4.252 MVAr at generation levels of 25%, 50%, 75%, and 100%, respectively. Adjusting the Unit Auxiliary Transformer (UAT) tap position to −2.5% restored the auxiliary bus voltage profile to normal condition. This study demonstrates that grid voltage is the dominant variable influencing reactive power demand and generator operating margin, while generation level determines the maximum reactive power capability boundary in the PLTP X electrical system.

Item Type: Thesis (Skripsi)
Additional Information: [No.Panggil: 2210314040] [Pembimbing: Luh Krisnawati] [Penguji 1: Henry Binsar Hamonangan Sitorus] [Penguji 2: Nur Fauziyah]
Uncontrolled Keywords: Active Power, Automatic Voltage Regulator, Generation Level, Generator Capability Curve, Geothermal Power Plant, Grid Voltage, Power Flow Study, Reactive Power, Synchronous Generator
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Fakultas Teknik > Program Studi Teknik Elektro (S1)
Depositing User: LIEMALASINTASARI
Date Deposited: 28 Aug 2026 02:56
Last Modified: 28 Aug 2026 02:56
URI: http://repository.upnvj.ac.id/id/eprint/53649

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