Dear all,
This is to inform you about two Master thesis presentations at IEA as per the
following details.
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Thursday 17/2 kl 10:30, KC M:IEA and Zoom (see below)
"Integrated DC fast charger in an electric vehicle"
Axel von Keyserlingk
Christoffer Johansson
Abstract:
More and more electric vehicles are emerging with a nominal battery voltage
higher than what most older DC fast chargers are capable of charging. This
requires the vehicle manufacturers to include a high power DC to DC converter
in order to be able to charge at these stations, adding cost and complexity.
Instead, with only minor modifications of the traction system, the motor and
inverter can be used as three parallel DC to DC converters, removing the need
for an extra converter. The aim is to develop, assemble and test a low voltage
system that can run at about the same current level as existing charging
stations. Its performance is assessed and the measured efficiency is compared
to a theoretically derived one. The results are then extrapolated to a higher
voltage in order to investigate its feasibility. The system is proven to work
satisfactorily at the low voltage, although with quite poor efficiency of about
80% at around 5kW charging. When increasing the voltage the efficiency seems
promising.
Supervisors: Mats Alaküla (IEA), Gabriel Domingues (BorgWarner)
Examiner: Francisco Marquez (IEA)
LU Zoom meeting: https://lu-se.zoom.us/j/66694226249
Meeting ID: 666 9422 6249
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Wednesday 23/2, kl 10:15, KC M:IEA and Zoom (see below)
Master’s thesis presentation
"Solar Energy Harvesting for Outdoor Applications"
Jonatan Andersson
Kristoffer Kjaerran
The use of solar cells as a solution for different energy harvesting
applications has seen a significant growth during the last few years. With the
recent advances in the power conversion efficiency and manufacturability of
organic photovoltaic cells these systems can be made even cheaper and more
available for consumers, opening up new ways for solar technology to be
implemented into products. This report investigates how an energy harvesting
system suitable for low power applications can be constructed with the use of
an organic photovoltaic cell as the energy harvesting source. It also explains
how this energy is sampled via a regulatory IC chip and how this all is
connected via a PCB. All components were carefully evaluated, tested and
assembled to form a final energy harvesting system. The report also resulted in
a simulation tool that can simulate the performance of the energy harvesting
system as implemented in a specific battery charging application. From these
simulations it is concluded that the system is very dependent on the OPV
azimuth angle. It performs well in south facing harvesting, allowing for a
substantial battery charging potential, but struggles to provide charging power
for a north facing OPV. However, depending on the magnitude of draining current
of the battery, a north facing OPV can still provide enough charging current to
be considered feasible for implementation. The report concludes that from a
performance point of view, an OPV based energy harvesting system can extract
enough energy to provide real value for potential future Verisure products.
The work has been carried out at Verisure AB, Malmö.
Supervisors: Nick Hackett (Verisure), Gunnar Lindstedt (IEA)
Examiner: Ulf Jeppsson (IEA)
LU Zoom meeting: https://lu-se.zoom.us/j/64583772754
Meeting ID: 645 8377 2754 (Waiting room enabled)
<https://lu-se.zoom.us/j/69260625569>
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Information about our seminars can also be found on our webpage:
http://www.iea.lth.se/seminars/index.html
