ANALISIS KONTINGENSI N-1 PADA SISTEM DISTRIBUSI 20 kV PT PLN (PERSERO) SEBATIK
Abstract
Penelitian ini mengevaluasi keamanan N-1 pada sistem distribusi 20 kV PT PLN (Persero) Sebatik akibat lepasnya pembangkit dan saluran penyulang. Sistem dimodelkan pada ETAP PowerStation 19.0.1 dan dihitung menggunakan aliran daya Newton–Raphson pada kondisi beban puncak. Lima kontingensi sisi sumber (Mitsubishi 1, Mitsubishi 2, Mitsubishi 3, MAN 8, dan interkoneksi GH Nunukan) serta lima kontingensi penyulang disimulasikan. Pada kondisi normal, beban sistem sebesar sekitar 4,061 MW dan 2,620 MVAr dengan rugi-rugi yang dilaporkan sebesar 0,050 MW dan 0,170 MVAr. Pelepasan Mitsubishi 1, Mitsubishi 2, dan Mitsubishi 3 menimbulkan pembebanan generator masing-masing 154%, 164%, dan 377%, sedangkan pelepasan MAN 8 tidak menimbulkan overload generator yang dilaporkan. Kondisi tegangan paling kritis terjadi ketika GH Nunukan dilepas dengan tegangan minimum 17,86 kV (0,8934 p.u.). Kontingensi penyulang tidak menurunkan secara signifikan tegangan pada bagian sistem yang tetap bertegangan, tetapi memutus beban pada konfigurasi radial. Kehilangan beban terbesar terjadi pada feeder 1 (kabel 28) sebesar 575,2 kW. Hasil ini menunjukkan bahwa kerentanan N-1 sistem Sebatik terutama ditentukan oleh keterbatasan cadangan pembangkitan dan topologi penyulang radial, sehingga penguatan cadangan sumber, kemampuan transfer penyulang kritis, dan jalur suplai alternatif perlu diprioritaskan.
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DOI: https://doi.org/10.35334/eb.v12i2.7645
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