Abstract
Java-Bali system is the biggest electricity grid in Indonesia which reaches 27.070 MW of peak load on October 17, 2018. Java island mainly interconnected by 500 kV transmission lines as the backbone and the system is chaptered onto many subsystems to 150 kV and 70 kV voltage levels. One of them is Bali which consists of 150 kV transmission lines and connected from Java island with four 150 kV underground cables supplied from Java. The Remedial Action Scheme (Defense Scheme) to maintain Island Operation is activated with under frequency relay (UFR) in case of decreased global system frequency. However, with the mentioned UFR, the simulation shows that in the contingency of four underground cables tripped, the Bali sub-subsystem will be unstable dynamically. This paper shows the study of proposed defense scheme method using rate of change of frequency (RoCoF) relay and Shunt Capacitor switching. The proposed method shows stable simulation results.
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