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Tujuan dari penelitian ini adalah untuk mengetahui besarnya nilai indeks kekuatan system (IKS) system kelistrikan Sulawesi Bagian Selatan. Untuk mencapai tujuan dari penelitian ini, simulasi sistem kelistrikan pada saat terjadi gangguan di PLTA Poso dengan menggunakan DigSilent. Simulasi dilakukan pada saat terjadi gangguan dalam dua waktu yang berbeda yaitu pada Waktu Beban Puncak (WBP) dan Luar Waktu Beban Puncak (LWBP) dengan tiga skenario gangguan yakni pada saat trip 1 unit, trip 2 unit dan trip 3 unit. Dari hasil penelitian menunjukkan bahwa besarnya nilai IKS dalam WBP sebesar 55,05 MW/Hz dan LWBP yaitu 47,19 MW/Hz.
The aim of this research to find out a value of electrical power system indeks (IKS) in South Sulawesi. To achieved this aim, simulation of the electrical system if an outage was occured in PLTA Pos under DgiSilent program. In this simulation, peak and off-peak season was chosen for the case study with three kinds of scenarious, such as: when 1 power plant was off, 2 power plant was off and 3 power plant was off, continuously. The result of research illustrated that a value of IKS for peak and off peka season were 55,05 MW/Hz and 47,19 MW/Hz.
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