Photovoltaic and Diesel Power Plant Optimization for Isolated Island

Photovoltaic (PV) and Diesel Generator (DG) hybrid power plant system could be one of the solutions to increase the renewable energy share and to reduce the fuel consumption in isolated Island. Especially in Indonesia, where most of the island supplied by DG. The goal of this study is to have the optimized solution of the PV Diesel system without a battery in Nusa Penida Island. It is assumed that new PV without a battery will be installed to work with six existing DG with a capacity of 1600 kW each to cover an average of 112 MWh/day load. By having the irradiance data, load data, diesel, and PV specification, the optimization can be done in HOMER Pro software. The sensitivity analysis is focused on the minimum load ratio where in this study it ranges from 25% to 80%. The result shows that the optimized PV size for the system is 6150 kW and it could cover 21% of the load, while the DG covers 79% of the total load. The sensitivity analysis indicates that different minimum load ratio affects the overall system performance. In the simple case shown, the different number of DG minimum load ratios can reduce fuel consumption by 5%.