Utvärdering av möjligheterna för ett mikronät : En förstudie åt AirSon Engineering AB

• Main Authors: Graneskog, Gustav, Kuusijärvi, Anton
• Format: Others
• Language: Swedish
• Published: Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap 2020
• Subjects: Microgrid; energy; renewable; Mikronät; energi; förnybar; Energy Engineering; Energiteknik
• Online Access: http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-42105

This report aims to evaluate if and how a microgrid could be constructed on AirSon Engineering AB:s estate. The main focus of the report is legislation, benefits with energy storage, different energy storage systems, system control and energy and power balances. A literature study and processing of data are used to answer the reports questions. The goal with this study is that the microgrid can be constructed without the need of concession. If certain exceptions are met Swedish legislation approves construction of a microgrid without concession. Additionally, the microgrid needs to fulfill the law about micro producers to get tax reduction. If possible, the current through the main fuse will not exceed 63 amperes. By reducing the production, the current can be limited to 63 amperes. Further, three energy storage systems are evaluated, lithium-ion battery, nickel metal hydride battery and hydrogen fuel cell. Lithium-ion battery is best suited when it comes to performance. From an economic perspective the size of the energy storage and charging cycles determines which system that is preferable. Variations in electricity price from night to morning gives an economic benefit from an energy storage via buying electricity night-time and using it in the morning. Furthermore, the energy storage leads to higher self-sufficiency and self-utilization. The microgrid will consist of 104,7 kilowatt peak power solar power and 3 kilowatt wind power. By collecting data from the estate and weather data from PVGIS energy and power balances are calculated. The microgrid will be a direct current grid and will be controlled by a so called EnergyHub, which is a product from Ferroamp that also balances the phases. Moreover, self-sufficiency and self-utilization are used to determine the optimal size of the energy storage system. A larger energy storage system will conclude in higher self-sufficiency and self-utilization. However, the self-sufficiency increases exceedingly little in compared to the increasement of the energy storage size.