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Hosting capacity of the power grid for electric vehicles - A case study on a Swedish low voltage grid
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building Engineering, Energy Systems and Sustainability Science, Energy Systems and Building Technology. Högskolan Dalarna.
Högskolan Dalarna.
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building Engineering, Energy Systems and Sustainability Science, Energy Systems and Building Technology.ORCID iD: 0000-0001-9230-1596
2022 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Hosting capacity (HC) is described as the maximum amount of new production or consumption that can be added to the grid without causing a violation. In this case study, a deterministic approach is used to investigate the HC of electric vehicle (EV) charging in a low-voltage grid, containing 13 detached single-family houses. It investigates how different parameters affect the HC, and what is causing the violation in the grid. Two different performance indices (PI) are used in the study: power cable overloading and voltage drop. The local grid is simulated for one year for four cases and the HC is derived for these. The cases are distinguished by two different violation thresholds for the voltage drop and two different implementation orders of the location of the charging. The results show that the HC of the grid is 6-11 EVs charging simultaneously. The difference in HC is primarily due to variation in the baseload through the year and location of charging. The cable between the substation and the first cable cabinet was the major contributor to the fault, and the PI causing the violation differed depending on what case was used.

Place, publisher, year, edition, pages
IOP Press , 2022. Vol. 1050, no 1, article id 012008
Series
IOP Conference Series: Earth and Environmental Science
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:hig:diva-39645DOI: 10.1088/1755-1315/1050/1/012008Scopus ID: 2-s2.0-85134688555OAI: oai:DiVA.org:hig-39645DiVA, id: diva2:1685442
Conference
7th International Conference on Sustainable and Renewable Energy Engineering (ICSREE 2022) 5-7 May 2022 Online
Available from: 2022-08-02 Created: 2022-08-02 Last updated: 2024-02-09Bibliographically approved
In thesis
1. Evaluation and variability of power grid hosting capacity for electric vehicles: Case studies of residential areas in Sweden
Open this publication in new window or tab >>Evaluation and variability of power grid hosting capacity for electric vehicles: Case studies of residential areas in Sweden
2024 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Electric vehicles (EVs) are increasing in popularity and play an important role in decarbonizing the transport sector. However, a growing EV fleet can cause problems for power grids as the grids are not initially designed for EV charging. The potential of a power grid to accommodate EV loads can be assessed through hosting capacity (HC) analysis. The HC is grid specific and varies, therefore it is necessary to conduct analysis that reflects local conditions and covers uncertainties and correlations over time.

This theses aims to investigate the HC for EVs in existing residential power grids, and to gain a better understanding of how it varies based on how the EVs are implemented and charged. The work is in collaboration with a distribution system operator (DSO) and is based on two case studies using real-life data reflecting conditions in Swedish grids. Combinations of different HC assessment methods have been used and the HC is evaluated based on cable loading, transformer loading and voltage deviation. Additionally, the study investigated three distinct charging strategies: charging on arrival, evenly spread charging over whole connection period, and charging at the lowest spot price. 

The results show that decisions on acceptable voltage deviation limit can have a large influence on the HC as well as the charging strategy used. A charging strategy based on energy prices resulted in the lowest HC, as numerous EVs charging simultaneously caused high power peaks during low spot price periods. Charging on arrival was the second worst strategy, as the peak power coincided with household demand. The best strategy was to evenly spread out the charging, resulting in fewer violations for 100% EV implementation compared to the other two strategies for 25% EV implementation. 

The findings underscore the necessity for coordinated charging controls for EV fleets or diversified power tariffs to balance power on a large scale in order to use the grids efficiently.

 

Place, publisher, year, edition, pages
Gävle: Gävle University Press, 2024. p. 40
Series
Licentiate thesis ; 18
Keywords
Hosting capacity (HC), Power grid, Electric vehicle (EV), Charging strategies, Power flow simulations, Uncertainty analysis
National Category
Energy Systems
Research subject
Sustainable Urban Development; no Strategic Research Area (SFO)
Identifiers
urn:nbn:se:hig:diva-43781 (URN)978-91-89593-27-5 (ISBN)
Presentation
2024-04-18, P106, Dalarna University, Borlänge, 10:00 (English)
Opponent
Supervisors
Available from: 2024-03-04 Created: 2024-02-09 Last updated: 2024-03-12Bibliographically approved

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Sandström, MariaDotzauer, Erik

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CiteExportLink to record
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Citation style
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