Studi Keamanan Pengiriman Daya Pada Sistem Interkoneksi Sumsel – Lampung Dengan Dua Tahap Optimasi

Abstract

During peak load, Lampung subsystem greatly depends on electric power supply from South Sumatra (Sumsel) subsystem through interconnection system at 150 kV. This operating mode causes critical operation of interconnecting line and may lead to unstable operation of generators connected to the system on the occurrence of fault. Hence, it is importance to study power transfer security to prevent further damage to the machines. In this research, we work on power transfer security with respect to rotor angle stability of generators connected to Sumsel-Lampung interconnection system. This problem is formulated by maximizing power transfer from Sumsel to Lampung while meeting rotor angle stability constraints and other operational constraints and solved by applying a Newtonian nonlinear programming primal-dual interior point. Simulation scenarios include power transfer maximization with and without considering rotor angle transient stability. Results on loading condition of this study reveal that maximum allowable transfer is about 230 MW. Therefore, adding new generating units within Lampung area is an alternative solution to improve the overall security operation of the interconnection system.