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Hur dimensionerar vi framtidens elnät? Fallstudie med avseende på e-mobilitet

Ingvarsson, Oscar LU (2017) In CODEN:LUTEDX/TEIE EIE920 20171
Industrial Electrical Engineering and Automation
Abstract
During the last few years, the interest for electric vehicles has increased enormously, there are
even talk of prohibiting fossil fuels in the coming years. There is a risk that the charging of
these electric vehicles can strain the electric grid. The simulations of the grid with added power
demand from the electric vehicles concludes that there will not be a problem on the low- and
medium voltage grid. The distribution of the customers’ charging times has greater impact on
how strained the grid is becoming than the charging power of each car. It might be a problem
for transformers with a high number of connected customers since even low charging powers
will accumulate to a noticeable power.
The network must be designed to supply... (More)
During the last few years, the interest for electric vehicles has increased enormously, there are
even talk of prohibiting fossil fuels in the coming years. There is a risk that the charging of
these electric vehicles can strain the electric grid. The simulations of the grid with added power
demand from the electric vehicles concludes that there will not be a problem on the low- and
medium voltage grid. The distribution of the customers’ charging times has greater impact on
how strained the grid is becoming than the charging power of each car. It might be a problem
for transformers with a high number of connected customers since even low charging powers
will accumulate to a noticeable power.
The network must be designed to supply the customers with electricity even at peak consumption.
Over the last few years many network companies have measured hourly consumption but
this has not always been the case. Previously the peak power for a group of customers has been
estimated with help of the so called Velander formula from their yearly consumption. By comparing
this calculated power with the hourly measured values, it was concluded that the formula
still gives an indication of the amplitude of the highest power. Since electric vehicle charging
change the previous relation between power and energy with the high but seldom peaks, Velander
formula is not usable for electric vehicles. It is therefore in the net owners’ interest to be
informed when charging stations is installed.
It is of great importance to look at the sum of the power demand and not only on each customer’s
power demand. When networks are built they usually are over dimensioned, mostly because the
margin it gives of uncertainties in expected consumption. The relatively low extra cost is also a
factor. This is mainly the reason why there has been such a good margin to allow an expansion
of electric vehicles in the grid. (Less)
Please use this url to cite or link to this publication:
author
Ingvarsson, Oscar LU
supervisor
organization
course
EIE920 20171
year
type
H3 - Professional qualifications (4 Years - )
subject
keywords
Velanders formel, elbilsladdning, dimensionering
publication/series
CODEN:LUTEDX/TEIE
report number
5392
language
Swedish
id
8918727
date added to LUP
2017-09-29 10:53:34
date last changed
2017-09-29 10:53:34
@misc{8918727,
  abstract     = {During the last few years, the interest for electric vehicles has increased enormously, there are
even talk of prohibiting fossil fuels in the coming years. There is a risk that the charging of
these electric vehicles can strain the electric grid. The simulations of the grid with added power
demand from the electric vehicles concludes that there will not be a problem on the low- and
medium voltage grid. The distribution of the customers’ charging times has greater impact on
how strained the grid is becoming than the charging power of each car. It might be a problem
for transformers with a high number of connected customers since even low charging powers
will accumulate to a noticeable power.
The network must be designed to supply the customers with electricity even at peak consumption.
Over the last few years many network companies have measured hourly consumption but
this has not always been the case. Previously the peak power for a group of customers has been
estimated with help of the so called Velander formula from their yearly consumption. By comparing
this calculated power with the hourly measured values, it was concluded that the formula
still gives an indication of the amplitude of the highest power. Since electric vehicle charging
change the previous relation between power and energy with the high but seldom peaks, Velander
formula is not usable for electric vehicles. It is therefore in the net owners’ interest to be
informed when charging stations is installed.
It is of great importance to look at the sum of the power demand and not only on each customer’s
power demand. When networks are built they usually are over dimensioned, mostly because the
margin it gives of uncertainties in expected consumption. The relatively low extra cost is also a
factor. This is mainly the reason why there has been such a good margin to allow an expansion
of electric vehicles in the grid.},
  author       = {Ingvarsson, Oscar},
  keyword      = {Velanders formel,elbilsladdning,dimensionering},
  language     = {swe},
  note         = {Student Paper},
  series       = {CODEN:LUTEDX/TEIE},
  title        = {Hur dimensionerar vi framtidens elnät? Fallstudie med avseende på e-mobilitet},
  year         = {2017},
}