Examensarbeten för masterexamen

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https://odr.chalmers.se/handle/20.500.12380/53

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Wind power with hydrogen production, storage, and reconversion as flexible baseload in the Nordic energy system
(2023) Hanitio, Quinn Sarah; Zas Bustingorri, Maria; Chalmers tekniska högskola / Institutionen för rymd-, geo- och miljövetenskap; Chalmers University of Technology / Department of Space, Earth and Environment; Johnsson, Filip; Öberg, Simon
This thesis aims to investigate the techno-economical feasibility of an offshore wind farm, combined with hydrogen production, storage, and reconversion as a Green Flexible Baseload in southern Sweden in 2030. In the future, it is expected that the share of variable renewable energies (VRE) will increase considerably in Europe, including Sweden and thus, there is a need for balancing technologies in such an energy system with high penetration of VREs. To investigate a concept including hydrogen production, storage, and reconversion in order to balance the inherent variations from wind power, a linear optimization model was developed to find the optimal design of the plant which maximizes the profit by considering the investment and operation of the plant. The work is focused on maximizing the profit made by such a power plant. The hourly operation of the different components is evaluated for a five-year period with real weather data and predicted electricity prices. An inter-year comparison of the designs is then carried out to analyze the effects of wind variations on installed capacity suggestions. The results show that there are multiple profitable design options for the power plant with different designs of the reconversion technology capacity. One of the main drivers for the overall profitability of the green flexible baseload is the price of hydrogen supplied directly to an assumed industrial demand. Two final designs are suggested according to the obtained profitability and oper ational quality results. The proposed designs correspond to the combinations of minimum baseload of 10% in summer to 20% in winter (variable baseload) and min imum baseload of 15% in summer to 15% in winter (constant baseload), both with a grid connection of 72% of the total wind farm capacity.
Shaping sustainability strategies: A comprehensive analysis of greenhouse gas reporting in the oil and gas sector and its strategic implications
(2023) Santhosh Kumar, Ajay; Chalmers tekniska högskola / Institutionen för rymd-, geo- och miljövetenskap; Chalmers University of Technology / Department of Space, Earth and Environment; Yeh, Sonia; Yeh, Sonia
Variation Management Strategies for Future Construction Sites: A study to address role of an equipment rental business in the energy transition
(2023) Blanksvärd, Ellen; Svensson, Frida; Chalmers tekniska högskola / Institutionen för rymd-, geo- och miljövetenskap; Chalmers University of Technology / Department of Space, Earth and Environment; Taljegård, Maria; Lundblad, Therese; Taljegård, Maria
Construction sites are facing challenges with high power peaks due to electrification of heavy equipment where potential consequences are increased power tariffs locally and risk of limited power supply. Another development is an increased intermittent power supply due to more wind- and solar power in the electricity system, which causes price fluctuations. These two developments strengthen the incentive to look at flexibility services. This study investigates different strategies to handle these two challenges in an equipment Rental business and how they can contribute with flexibility measures at construction sites for the electricity system. The methods used in this study were an interview study and a case study where a model of the electricity demand at a construction site was created. In the case, the potential of using battery storage at a construction site for peak shaving and load shifting was evaluated. This was done by optimizing the system cost at the case to see if it is efficient to invest in a battery and be flexible with the load, or purchase electricity directly from the grid. The interviews were a part of mapping the challenges faced by the Rental business and construction sites related to power supply and a changed electricity system. Further, the purpose of the interviews was to evaluate the barriers to using different flexibility services at a construction site. Some output from the interviews was also used for making assumptions in the model about the use of equipment to estimate the power demand of electrified equipment. One outcome of the interview study was that the Rental business has a role in providing comprehensive solutions to the customer and enabling climate-neutral construction sites. Another conclusion was that the Rental business could have an educating role and recommending the most suitable option when electrifying a construction site, which in the future can include flexibility services such as battery storage. The case showed that it was efficient to invest in battery storage to shift the electricity demand. The optimal battery size was mainly affected by electricity prices during the observed time period, the magnitude of the peaks, and the recurrence of peaks. Another outcome was that critical peak loads can occur in an early phase of construction due to homogeneous charging behaviors of vehicles during breaks. This suggests a selection of batteries with high discharge capacity. Additionally, a combination with charging strategies was effective to reduce costs.
Formation of compact obscured nuclei. Uncovering the most hidden objects in the universe
(2023) Robeling, Nils-Martin; Chalmers tekniska högskola / Institutionen för rymd-, geo- och miljövetenskap; Chalmers University of Technology / Department of Space, Earth and Environment; Aalto, Susanne; Aalto, Susanne
To begin with, I would like to extend a deep thank you to my supervisor and examiner, Susanne Aalto. Through many discussions, you have provided me with guidance both in my research for this thesis as well as for my future career. I would also like to thank you for providing me with the opportunity to present my research in Italy and for sending me to the UK (where I was very well received by Dimitra Rigopoulou, thank you), for a cooperative effort on simulating CONs. Further, I would like to thank all the people on the CONquest team, Clare, Mark, Mamiko, Kyoko, Chentao, and Sabine. You have all helped me by deepening my knowledge, providing excellent company, and answering my annoying questions (especially you, Clare, and Mark). I also hold much gratitude to the Department of Space, Earth, and Environment at Chalmers for providing me with office space as well as the possibility to visit Onsala Space Observatory and work there. Finally, I would like to thank my family, who have listened to my ranting for countless hours, provided me with emotional support, and encouraged me to pursue research.
Life cycle assessment and techno-economic analysis of eFuels used in heavy-duty vehicle
(2023) Hakim, Salsabila Masitah; Chalmers tekniska högskola / Institutionen för rymd-, geo- och miljövetenskap; Chalmers University of Technology / Department of Space, Earth and Environment; Yeh, Sonia; Janssen, Matty

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