Electric vehicles charging loads in residential areas of private houses

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Journal Title
Journal ISSN
Volume Title
Sähkötekniikan korkeakoulu | Master's thesis
Date
2020-10-19
Department
Major/Subject
Sustainable energy systems and markets
Mcode
ELEC3048
Degree programme
Master's Programme in Advanced Energy Solutions
Language
en
Pages
36+2
Series
Abstract
Number of electric vehicles (EV) is increasing all over the world due to their driving performances and lower environmental impact in comparison with conventional combustion engine cars. Finland, as one of the leading countries in adopting new technologies, is interested in the development of infrastructure for battery electric ve-hicles (BEV) as the number of such automobiles is growing every year. Growth of electric vehicles inevitably causes a growth of energy demand needed for their charging. Talking about privately owned cars, it is important to ensure that their charging at home is possible. That is why it is necessary to estimate if electric grid is able to meet new electricity demands dictated by increased number of EVs. In this work charging loads of electric cars in residential areas of private houses in Finland are studied. Models represent different charging scenarios, uncontrolled and price-optimized, at four power levels – 1.84 kW, 3.68 kW, 11.1 kW, 22.2 kW. Houses were divided into groups of 5, 10, 50 and 100. Main findings indicate that highly coincident fast charging at price-optimized scenario will significantly overload the grid. Poorly dimensioned electric network can suffer even during slow charging. Most of the grid stress in uncontrolled charging happens at the same time with evening peak load of households. Also, according to results of the simulation, slow charging causes the least amount of stress to the grid, while providing enough energy to charge all the cars during night time.
Description
Supervisor
Lehtonen, Matti
Thesis advisor
Lehtonen, Matti
Keywords
electric vehicle, charging, load modelling, private house
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