Solceller på Västergårdsgymnasiet : En förstudie för att implementera solceller och energilagring ur ett ekonomiskt perspektiv

The purpose of the project was to carry out a study of a potential solar cell facility at Västergårdsgymnasiet. Previous studies have established that there is the greatest potential for electricity production during the summer period, which coincides with the load at its lowest. The aim of the project was therefore to investigate a solar cell plant with energy storage and how the surplus of the electricity produced can be stored.The modeling was performed with an installed capacity of 1231 kW solar panels and evaluated with the software Homer Pro, which is designed to simulate and optimize local energy systems. The execution of the project was divided into four main steps, the first being to check the solar-power plant's potential by calculating the theoretical electricity production against the property load. From this, the theoretical surplus could also be calculated, which is the cornerstone of the other main elements. The simulation resulted in the annual electricity production level being approximately 1.2 GWh and the theoretical surplus was estimated to be 0.5 GWh. The surplus in the system is sold to the electricity grid with a financial compensation based on Nordpool's spot prices. The financial result showed that it was not profitable with the conditions that the facility has and sensitivity analysis depending on the spot price was performed. The remaining three main steps are based on different types of energy storage methods, these are storage with lithium-ion batteries, flow batteries and hydrogen storage. The purpose of these energy storage methods was to reduce the proportion of electricity sold to increase the economic profitability and contribute to a higher degree of self-sufficiency.The systems with battery storage resulted in an increased degree of self-sufficiency but did not contribute to any increased economic profitability. The last storage method that was investigated was hydrogen storage, this was done with three different applications. The first application was based on the surplus of the produced solar energy being used to produce hydrogen. The produced hydrogen gas was then stored until the system has a shortage of energy and was then supplied to the fuel cell that produces both electricity and heat that were used in the property. The study showed that the method would not contribute to any economic profitability. The second application that was investigated was of the same basic structure as before but has been supplemented with a flow battery. The simulation of the system showed an increased degree of self-sufficiency but with a higher cost. The last method of application that was investigated was that the surplus energy is used to produce hydrogen, which was then used for an internal vehicle fleet or alternatively sold. The application gave promising results with the possibility of financial profitability