To model the energy system of the island with fuel cells, all necessary components for electrolysis and burning hydrogen were added to the HOMER model of the islands current energy system. A 700kW AC-DC converter, 600kW electrolyser, 300 kg hydrogen tank and 250 kW fuel cell were added into the HOMER model. The size and power ratings of these components were selected based on research of fuel cell systems and judgements from the current amount of excess renewables production from the wind turbines on the island. The schematic of the HOMER model is displayed to the right. When extra electrical energy from renewable production is available after meeting the load, the electrolyser uses it to create hydrogen which is stored in the tank. The fuel cell then uses this hydrogen to create electricity during times when the renewables production cannot meet the load. The functioning of this system for an October week is shown in the graph below.
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