Critical Contingency Assessment of a 150/275 kV Interconnected Power System

Abstract

The 150/275 kV Southern Sumatra Interconnected System (in Bahasa: Sumbagsel) is crucial for providing reliable and sustainable electricity to the region. As network complexity and energy demand grow, challenges related to dynamic security intensify. This study assesses the system's ability to maintain stability during disturbances. Analyses using DIgSILENT PowerFactory software evaluated system responses to fault scenarios, particularly large generator losses, focusing on rotor angle, system frequency, and bus voltage after disturbances. Results show that the Sumbagsel interconnection has critical points prone to dynamic instability. While the system can remain stable within safe limits if disturbances don't exceed handling capacity, mitigation measures like improved coordination between generation and transmission networks are necessary. This study aims to enhance the power system's reliability in the region and prepare it for future operational challenges.