Past seminars at IEA in 2022
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Wednesday 23/2, kl 10:15, KC M:IEA and Zoom (see below)
"Solar Energy Harvesting for Outdoor Applications"
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)
Thursday 17/2 kl 10:30, KC M:IEA and Zoom (see below)
"Integrated DC fast charger in an electric vehicle"
Axel von Keyserlingk
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
Tisdag 9/2 kl 15:00, on Zoom (see below) and in KC M:IEA, Presentation av examensarbete.
"Smart charging and ancillary services in the Malmö region"
To meet Sweden's national environmental goal of 70% emissions reduction by 2030 compared to 2010 from domestic transport, electrification is considered key. However, as more chargeable vehicles are integrated into the market, shortage of capacity for charging infrastructure may arise. To remedy this, flexibility within charging infrastructure is proposed. The aim for this thesis is to estimate the progress of electrification in Sweden, as well as evaluate the potential and need for different types of flexibility concerning electric vehicle charging. A MATLAB model for a future scenario for electrification of transport is developed to assess the future need and potential for various strategies of smart charging solutions. Results indicate that a 90% reduction in peak power consumption, compared to the base case, may be obtained using solutions such as scheduling and signals from flexibility markets. Also as part of the thesis, a smart charging demonstration project performed by E.ON and Parkering Malmö is evaluated in terms of delivered power reduction and ease of operation. Assessment shows that reduction in power did take place, with varying effect. Influenced by the number of charging sessions meeting conditions for participation, relative reduction varies between 14% and 82%. The manual nature of the evaluation performed in this thesis might not be desirable for future development of the project and may induce some inaccuracy. A more automatic method using the VPP control software is proposed, but may require further studies for verification.
Handledare: Mats Alaküla (IEA), Alice Jansson (IEA), Peder Berne (E.ON Energiinfrastruktur)
Examinator: Olof Samuelsson (IEA)
LU Zoom meeting: https://lu-se.zoom.us/j/69260625569
Friday February 4, Lecture hall KC:A, Chemical Engineering building (Kemicentrum), Sölvegatan 39, Lund
Licentiate Thesis Seminar:
"Modeling of electric power systems in electric vehicles"
The market for partly or fully electrified vehicles is expanding fast. The number of sources and loads that are connected to the vehicles traction voltage systems (TVS) increase and thus also the ElectroMagnetic Compatibility (EMC) requirements on these sources and loads. These requirements should make sure that neither function nor lifetime of any source or load is severely affected by another. The EMC requirements include both Common Mode (CM) and Differential Mode (DM) voltages and currents created by the modulation of the various power electronic converters involved as well as intentional and parasitic impedances of the TVS and reach up to at least 10MHz for CM and 100kHz for DM. This paper presents a theory for the dimensioning of CM-capacitances in an Electric Machine Drive (EMD) that is confirmed by measurements on a commercial electrical Volvo truck. The conclusions point out a recommendation for selection of the CM-capacitances of the EMD vs. the CM capacitance of the Electrical traction Machine (EM). As a rule of thumb the recommendation is that the CM-capacitance of the EMD is around 50 times the CM-capacitance of the EM and mounted inside the EMD to avoid big loops of CM currents in the vehicle.
Prof. Mats Alaküla (Lund University, Lund, Sweden)
Prof. em. Hans Bangtsson (Lund University, Lund, Sweden)
Dr. Urban Lundgren (RISE - Research Institute of Sweden)
Prof. Olof Samuelsson (Lund University, Lund, Sweden)
Past seminars at IEA in previous years