Dear all,
This is to inform you about presentations at IEA, as per the following
details:
Friday 5/3, 10:30-12:00 Zoom (see below)
Masters thesis presentation
Modelling and Control of Dish-Stirling Solar/Gas Hybrid System
Edvin Wallander
Abstract: The world is moving towards more sustainable energy production,
creating pressure and opportunity for the development of renewable energy
sources. The new energy system is likely to be built around renewable energy
sources like wind and solar, hydrogen and bio-methane. This project will
focus on developing a unique concentrated solar power technology (CSP). The
system is being developed by the company Stirlingversal and utilizes a
Stirling engine, a reflecting dish and a gas burner to be able to generate
power even when the sun is not shinning.
In this thesis a model of the Dish-Stirling system is developed including a
model of the Stirling engine and the generator connected to the grid. A
fixed speed squirrel-cage induction generator configuration and a variable
speed doubly-fed induction generator configuration are modelled and
compared. Power quality improvement methods are implemented in both systems.
Lastly an electrolyser is modelled and integrated with the system. Hybrid
mode operation is modelled and analysed in terms of gas consumption for
different irradiation conditions and the model results are then used to
compare the hybrid Dish-Stirling system with a photovoltaic and battery
based system of equivalent performance for two potential locations that
offer very different solar power potential: Lund (Sweden) and Johannesburg
(South Africa).
The comparison shows that given a low enough fuel price the Stirling system
can be cheaper than a comparable PV and battery based system when
electricity generation is considered. However, the Dish-Stirling system
needs not only a cheap but also environmentally sound fuel source in order
to be competitive.
The work has been carried out in collaboration with Stirlingversal AB.
Supervisors: Francisco J. Márquez-Fernández (LTH), Lars Larsson
(Stirlingversal AB), Lars Olsson (Stirlingversal AB)
Examiner: Mats Alaküla.
Opponents: Claes Kinch and Gabriella Nordquist
Link: <https://lu-se.zoom.us/j/68039010654>
https://lu-se.zoom.us/j/68039010654
You can also join the meeting by entering the following information in the
Join a meeting dialogue or in the Zoom app:
Meeting ID: 680 3901 0654
Dial into the meeting with a local number:
+46 8 5050 0828 Sweden
+46 8 5052 0017 Sweden
If your local number is not listed, look it up at:
<https://lu-se.zoom.us/u/ccF3TgcXnS> https://lu-se.zoom.us/u/ccF3TgcXnS
Friday 5/3, 13:00-14:30 Zoom (see below)
Masters thesis presentation
Automated connection for charging of agricultural machines in the field
Henrik Rosberg
Abstract: When it comes to the electrification of agriculture, one of the
most challenging problems is the energy supply to the field vehicles (mostly
tractors, but also other more specialised machines). These vehicles usually
operate in harsh environmental conditions of mud, dust and dirt, in fields
that may be several kilometres away from their base. This, together with
their high power consumption (depending on the task at hand) and long
working passes motivates the need for a portable charging solution that
enables charging in the field.
In this thesis a concept study is presented, evaluating what type of
charging solution is the most appropriate for this. The study takes into
consideration static (charging while the vehicle is at standstill at the
designated charging station) and dynamic (charging while the vehicle keeps
working) charging alternatives are considered, as well as battery swapping.
The proposed alternatives are evaluated in terms of robustness, cost
effectiveness, efficiency and portability, for different system parameters
such as the battery size on board the vehicles, the average power
consumption of the vehicles or the maximum field area (in hectares) that can
be covered in a day.
The results show that static charging is more cost effective than dynamic
charging in almost all cases, except when the considered battery cost is
higher than 200 USD/kWh and the maximum field area that can be covered in
one day is larger than 80 hectares. However, even in this cases, the lower
robustness and higher potential investment risks associated with developing
a dynamic charging solution may still favour static charging. Based on this,
a robust and portable static charging station concept has been developed and
is presented in this work.
The work has been carried out in collaboration with Volvo Construction
Equipment in Eskilstuna.
Supervisors: Francisco J. Márquez-Fernández (LTH), Bobbie Frank (Volvo CE)
and Joakim Unnebäck (Volvo CE)
Examiner: Mats Alaküla.
Opponent: Edvin Wallander
Link: https://lu-se.zoom.us/j/64501280614
You can also join the meeting by entering the following information in the
Join a meeting dialogue or in the Zoom app:
Meeting ID: 645 0128 0614
Dial into the meeting with a local number:
+46 8 5050 0828 Sweden
+46 8 5052 0017 Sweden
If your local number is not listed, look it up at:
<https://lu-se.zoom.us/u/cdpQ7dfhVp> https://lu-se.zoom.us/u/cdpQ7dfhVp
Information about our seminars can also be found on our webpage:
<http://www.iea.lth.se/seminars/index.html>
http://www.iea.lth.se/seminars/index.html
