||Charging strategies for plug-in hybrid vehicles
||Poulsen, Niels Kjølstad (Mathematical Statistics, Department of Informatics and Mathematical Modeling, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark)
||Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark
||At Risø DTU a Toyota Prius has been equipped with a battery that gives the car
a range of approximately 50 km on electricity only and thereby been converted
from a hybrid electrical vehicle, HEV, to a plug-in hybrid electrical vehicle,
Changes in supply and demand on the wholesale power market are re
in the electricity price level and if PHEV users select to charge in periods of
lower price it will affect their total cost of charging and by that the cost per
driven kilometre. This report investigates the effect of a few different charging
strategies on the charging cost to a user that faces variable electricity prices.
The traditional way of recharging a battery is to plug it in and to switch on the
charger immediately and then to dissconnect the charger when the battery is
fully charged. This scenario will be used as a reference in terms of charging cost.
For scheduled charging under a time period between plug-in and unplugging of
the vehicle to the grid the electricity prices during different time steps of this
period must be either known or forecast.
Focus in this report is on the characteristics of the components involved in a
system for automated vehicle charging and potential approaches to the charging
strategy. The numerical findings suffer from a simple and non-adaptive forecast
model and anomalous behaviour of an optimisation function. It can however be
seen that the more elaborate optimisation models that could be calculated did
produce a lower charging cost than their more simple counterparts.
Creation date: 2008-06-04
Update date: 2008-08-29