Peningkatan Stabilitas Transien pada Jaringan Transmisi Subsistem Aceh Menggunakan Power System Stabilizer (PSS)

Abstract

Transient stability is the ability of a power system to remain synchronized after experiencing a sudden major disturbance. Such disturbances can cause oscillations in rotor angle, voltage, and frequency in generators, which if uncontrolled, will lead to system instability. This research aims to enhance transient stability in the Aceh subsystem transmission network by adding Power System Stabilizer (PSS) devices to the power system. Simulations were conducted using DIgSILENT PowerFactory software with a model of the Aceh subsystem transmission network interconnected with the North Sumatra subsystem. This study compares the system conditions without PSS and with PSS in terms of rotor angle, voltage, and frequency parameters following a three-phase short-circuit fault on the most heavily loaded line, namely the Arun-Bireun transmission line. Simulation results show that without PSS, the system experiences significant rotor angle oscillations with an overshoot of up to 1,4620 pu, busbar voltage drops by up to 0.63 kV, and frequency reaches 51.625 Hz, which is outside the safe limit. After installing STAB 1 type PSS at PLTU Nagan Raya 1, PLTMG Arun 1, and PLTD Cot Trueng, the system shows improvement: rotor angle overshoot decreases by 0,0103 – 0,2541 pu and setling time is faster by up to 6.16 seconds for most generators; steady-state frequency is within the safe emergency limit of 50.491 Hz. However, voltage drops by up to 4.79 kV but remains within grid code limits (+5%, -10%).