Vätgassystem som reservkraft och effektkompenserande medel : Modellering och ekonomisk värdering av ett potentielt vätgassystem till ett sjukhus

Sammanfattning

In this report, a hydrogen system was investigated to supply a hospital with reserve power and power compensation. Through modelling, four different configurations of hydrogen systems and five different levels of maximum power intake from the electrical grid was evaluated. The evaluation was based on the economical feasibilty and climate footprint of the four different systems. The optimal hydrogen system that was suggested in this report was consisting of Proton electrolyte membrane(PEM) electrolysers, PEM fuel cells and solar panels that powered the elctrolysers for hydrogenproduction. The optimal power intake level was 2000 kW. The suggested system (hydrogen system 3) was never profitable and was shown using the economical metrics Net presentvalue and Levelised cost analysis. Though the hydrogen system had a positive cash flow, it had a large investment cost making it never profitable during the lifetime of the project, that was set to ten years. The total investment cost for the system amounted to 133 million swedish crowns and the cost of the energy used from the PEM fuel cells amounted to 0,536 thousand swedish crowns per kWh. This was due to the fuel cells since they were dimensioned for the reserve power as well which demanded a high power output, thus increasing the investment cost. Another reason for the high investement cost was the PEM technology that was used for the electrolysers and fuel cells. It is an immature technology but it stands out as leading technology for improvements and being important to reach an energy system that is sustainable. The amount of saved carbondioxide equivalents compared to the normal case when a hydrogen system was not in use, amounted to 74 tons.