The increase of variable renewable source leads to an imbalance between the electricity supply and demand of the power grid, as the solar and wind energy production is weather dependent. By implementing battery energy storage system (BESS), the balance can be improved by storing energy when the supply is high and then use when the supply is low. The aim of this study is to investigate the profitability of implementing a BESS with a photovoltaic plant to the grid connected facility of Gävle Energi AB. This by mapping the potential revenues that can benefit both the property and power grid. The aim is also to investigate the cost saving of a BESS with an optimal control and then look at the sizing of the battery. At the Swedish battery market there is two technologies, lithium ion and nickelmetal hybrid, both of which have different characteristics that affect its service life. The battery life is affected by its chemistry, state of charge, depth of discharge, charge rate, temperature, and operating conditions. One of the revenues with BESS are to take advantage of the price difference and charge the battery when the electricity price is low and discharge when it is high. The revenue is also to increase the self-use of solar power to the facility, peak shaving, and frequency control. You can also use the BESS as an emergency power due to its fast output power. The simulation was built in the program Excel containing eight different tasks, all with different battery sizes. Each task contained four control models; increase selfuse of solar power, peak shaving, frequency control and a combination of the three. This with input data from both 2018 and 2019. The result showed that the best savings in all tasks occurred with the frequency control model or the combination model. The size of battery depends on the service life. The battery lift is hard to predict and thus also the choice of battery size. As the control model affects the battery life, the ideal battery life of 20 years can be difficult to achieve. Therefore, a BESS of 100 kWh may be recommended. Except as a property revenue, the BESS may reduce some percentage of marginal electricity and thus also the carbon dioxide emissions and may also support the power grid with frequency control.
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:hig-33235 |
| Date | January 2020 |
| Creators | Johansson, Carolina |
| Publisher | Högskolan i Gävle, Energisystem och byggnadsteknik |
| Source Sets | DiVA Archive at Upsalla University |
| Language | Swedish |
| Detected Language | English |
| Type | Student thesis, info:eu-repo/semantics/bachelorThesis, text |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
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