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Optimal De-Centralized Smart Home-Charging: Potential Study
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.ORCID iD: 0000-0001-6292-0695
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.ORCID iD: 0000-0003-0051-4098
2018 (English)Conference paper, Published paper (Refereed)
Abstract [en]

This paper evaluates the impacts of electric vehicles’ (EVs’) smart charging algorithms on reducing the peak of the total load of households. Two smart charging schemes are proposed. The first scheme—postponed charging—is defined as reducing the charging power if the total load exceeds the fuse size, thereby sometimes postponing the charging. The second scheme—capacity-filling charging—is defined as charging the EVs with the difference between the fuse size and the house load, i.e., the available capacity. Both schemes were benchmarked to the uncontrolled charging scheme.

The study was evaluated on 10 different Swedish simulated detached houses without electric heating, and using various combinations of charging powers and fuse limits. The results show that the worst house—the house that needed smart charging the most—needed postponed charging 8 days a year to avoid breaking the fuse. Moreover, postponed charging increased the charging duration, and thus inconvenience to the EV owners, by at most 4 hours. On the other hand, the capacity-filling charging scheme could increase or decrease the charging duration—compared to the uncontrolled charging. An increase is expected if the difference between the fuse size and the house load is smaller than the uncontrolled charging power. The charging duration will be shorter if the difference between the fuse size and the house load is larger than the comparable uncontrolled charging power.

The capacity-filling scheme proved to be more convenient, as it did not increase the charging duration by more than 3 minutes. Moreover, it reduced the charging duration for at least 198 days a year.

The results indicate that charging the EVs by the available capacity—the difference between fuse size and house load—is recommended compared to constraining the charging power.

Place, publisher, year, edition, pages
Stockholm Sweden: Energynautics GmbH, 2018.
Keywords [en]
Electric vehicles, smart charging, uncontrolled charging, peak power
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering Energy Systems
Identifiers
URN: urn:nbn:se:uu:diva-363295OAI: oai:DiVA.org:uu-363295DiVA, id: diva2:1256208
Conference
2nd E-mobility integration workshop
Available from: 2018-10-16 Created: 2018-10-16 Last updated: 2018-10-18Bibliographically approved

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Shepero, MahmoudFachrizal, RezaMunkhammar, Joakim

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