Abstract
An on-grid solar power plant will distribute electric power to the grid in normal conditions. But when the supply of grid outages (islanding), on-grid solar power plant also can’t operate because the loss of the reference signal that is used as a reference for the inverter in the synchronization process. So there is potential loss of power when solar power plant can be used as a substitute source of electrical energy while PLN can’t serve consumers. In this research developed a simulation model that refers to the off grid solar power plant 500 Wp in the Department of Electrical Engineering, University of Udayana and can operate on-grid and off grid when islanding in matlab simulink. In this model made operation scenario where solar power plant operates on grid at the beginning of the simulation and after that operate off-grid (not connected to the grid and supply the local load). The simulation results show the model off grid solar power plant has been able to generate a voltage of 220 V and a frequency of 50 Hz in accordance with the solar power plant at the research site. The simulation results also show model of on grid solar power plant has been able to synchronize to the low voltage grid of PLN not loaded and loaded. On/off grid solar power plant model can operate on-grid or off-grid that corresponds to the operation scenario and produce the same output. Thus solar power plant can supply.
Highlights
Intisari — Suatu PLTS on-grid akan menyalurkan daya listrik ke jaringan PLN pada kondisi normal
Saat PLTS off grid, LBS1 dan LBS2 dalam kondisi OFF untuk memutus aliran daya dari PLTS ke Jaringan Tegangan Rendah (JTR) dan dari JTR ke beban
Blok ATS memegang peranan penting dalam memindahkan inputan sinyal on grid menjadi off grid ke inverter
Summary
PLTS yang terhubung dengan jaringan (on-grid) menggunakan inverter yang dapat melakukan sinkronisasi dengan jaringan PLN terhadap parameter-parameter berupa tegangan, frekuensi dan beda fasa. Penelitian yang membahas tentang PLTS on grid sudah cukup banyak dilakukan seperti penelitian oleh Bambang Sujanarko, tentang suatu metode baru pada proses sinkronisasi inverter dengan jaringan listrik PLN satu fasa. Proses tersebut dilakukan dengan mengontrol inverter menggunakan metode algoritma digital Phase Locked Loop (PLL) sehingga diperoleh tegangan, frekuensi dan sudut fasa yang sesuai dengan jaringan PLN [2]. Hasil yang diperoleh adalah dengan menggunakan perangkat Uninterruptible Power Supply (UPS) pada sistem jaringan listrik mikro dapat memperbaiki unjuk kerja GTI, dengan UPS sebagai acuan kerja GTI sehingga saat kondisi islanding perangkat GTI masih dapat beroperasi [4]. Oleh sebab itu dalam penelitian ini disimulasikan melalui Simulink Matlab tentang sistem kontrol pengoperasian PLTS saat sinkronisasi ke jaringan PLN (on grid) disertai saat kondisi islanding yang megacu pada PLTS off grid 500 Wp di Jurusan Teknik Elektro, Universitas Udayana.
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