Contingency Analysis of the Kendari Electrical System: A Case Study of IBT II 250 MVA

Abstract

The transmission system for electrical power must operate reliably and continuously; however, disruptions often affect the reliability and stability of the system. Equipment failures during operation can have adverse effects on the power distribution system. The Kendari Subsystem, connected through IBT at the Wotu Main Substation, plays a crucial role as the backbone in the Sulselrabar electrical system with high risks due to the operation of only one IBT unit, namely IBT II with a capacity of 250 MVA, while IBT I has a different capacity. This subsystem significantly influences the distribution of electrical energy from various generators, especially the Poso Hydroelectric Power Plant. This research employs power flow simulation to analyze contingencies in the Kendari Subsystem of the 150 kV electrical system, focusing on IBT-II 275/150 kV with a capacity of 250 MVA. The research findings reveal frequency fluctuations in contingency situations that subsequently recover continuously. Almost all bus voltages experience increases above the permissible limits, and adjustments to load and VAR generator settings are made according to established load procedures. These findings can serve as a reference for enhancing the operation of the power system under similar conditions.