Study on The Implementation of Overfrequency Generation Shedding (OFGS) In Improving The System Defense Scheme of Sulutgo at The Amurang Power Plant

Abstract

The North Sulawesi and Gorontalo (Sulutgo) power system comprises three subsystems or islands: Tanggari Island, Amurang Island, and Gorontalo Island. Each island has an imbalanced composition of generation and load. Consequently, if an island operation scheme is implemented, each island will experience either underfrequency or overfrequency issues. Amurang Island hosts the Amurang coal-fired power plant with a capacity of 2x21.5 MW and 2x27 MW, making it one of the largest power plants in Sulutgo. Therefore, if island operation occurs, Amurang Island's frequency will be affected, necessitating the implementation of an Overfrequency Generation Shedding (OFGS) scheme at the Amurang power plant. In the event of island operation, without an OFGS scheme, the frequency of Amurang Island would reach 54.89 Hz, but with the OFGS scheme in place, the frequency would improve to 50.13 Hz..