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- Alfredsson, Hampus, et al.
(författare)
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Transportation Goes Electric – Exploring the Potential of Smart Charging Strategies for Airports
- 2023
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Konferensbidrag (refereegranskat)abstract
- Transport electrification continuously increases globally and propagates to new, even-larger vehicle applications due to decreased costs, battery technology improvements, and charging infrastructure rollout. This work highlights the importance of strategic planning for large electric vehicle charging nodes, like depots, terminals, airports and ports. Specifically from the perspective of predicting future power requirements and how to satisfy energy demand using a combination of smart charging algorithms, local photovoltaic electricity production and battery energy storage systems. A case study is presented where developed tools and models are applied to an airport for high-power charging of future electric aircraft.
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- Andersson, Fredrik N G, et al.
(författare)
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The Euro and the Nation-State That Never Disappeared: Would Europe Benefit from the Return of National Currencies?
- 2020
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Ingår i: The European Union and the Return of the Nation State. - Cham : Springer International Publishing. - 9783030350048 ; , s. 165-189
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- This chapter discusses the current problems and future prospects of the euro area. The author argues that the problem for the euro area is not the return of the nation-state, but that the nation-states never disappeared. A common currency requires common economic policies, which is largely lacking in the euro area. As a result, large economic and social imbalances have emerged. The chapter examines proposals from the European Commission to increase the level of co-operation to reduce the imbalances. He finds the proposals backward-looking and insufficient. Towards the end of the chapter, the author explores possibility of some countries leaving the euro area. He finds that a friendly divorce is costly in the short term, but likely needed to restore economic balance in the long run. According to the author, a smaller euro area may mean more European co-operation down the line.
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- Apelfrojd, Senad, et al.
(författare)
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A Back-to-Back 2L-3L Grid Integration of a Marine Current Energy Converter
- 2015
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Ingår i: Energies. - : MDPI AG. - 1996-1073. ; 8:2, s. 808-820
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Tidskriftsartikel (refereegranskat)abstract
- The paper proposes a back-to-back 2L-3L grid connection topology for a marine current energy converter. A prototype marine current energy converter has been deployed by a research group at Uppsala University. The concept behind the prototype revolves around a fixed pitch vertical axis turbine directly connected to a permanent magnet synchronous generator (PMSG). The proposed grid connection system utilizes a well known and proven two level voltage source converter generator-side combined with a three-level cascaded H-bridge (CHB) multilevel converter grid-side. The multilevel converter brings benefits in terms of efficiency, power quality and DC-link utilization. The system is here presented for a single marine current energy converter but can easily be scaled up for clusters of marine current energy converters. Control schemes for both grid-side and generator-side voltage source converters are presented. The start-up, steady state and dynamic performance of the marine current energy converter are investigated and simulation results are presented in this paper.
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- Apelfröjd, Senad, et al.
(författare)
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Experimental Verification of a Back-to-Back 2L-3L Grid Connection System for a Marine Current Energy Converter
- 2016
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Konferensbidrag (refereegranskat)abstract
- Rivers, tides and other ocean currents are renewable energy sources with great potential across the globe.A research group at Uppsala University is working on converting the power in rivers and ocean tidesusing a vertical axis turbine with a directly driven permanent magnet generator. The concept in focususes an omnidirectional, fixed pitch vertical axis turbine directly connected to a permanent magnetgenerator. Few moving parts and an overall low mechanical complexity is the main idea behind theconcept. A first full prototype was deployed in 2013 in the river Dalälven in the town of Söderfors. Thework presented here is a step towards grid connection of the marine current energy converter prototype.A back-to-back 2L-3L grid connection topology has been proposed. The system is adapted to the scaledprototype but is intended for larger turbines. The proposed grid connection system utilizes a three-levelcascaded H-Bridge voltage source converter (3L-CHBVSC) on the grid side together with a well knowtwo-level voltage source converter on the generator side. The use of a multilevel converter brings severaladvantages such as higher efficiency, more sinusoidal voltages and currents and smaller grid filtersamong other advantages. The proposed grid connection system has been constructed in the laboratory.The work presented here aims to evaluate the system in the laboratory. A synchronous generator with avery similar design to the on-site generator is used for the tests. The generator, driven by an inductionmotor, is connected to the system and power is successfully transferred to the grid. The conducted testsare used to verify the functionality of the system before installation at the research site.
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- Bakardjieva Engelbrekt, Antonina, 1963-, et al.
(författare)
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What Does the Technological Shift Have in Store for the EU? Opportunities and Pitfalls for European Societies
- 2021
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Ingår i: The European Union and the Technology Shift. - Cham : Palgrave Macmillan. - 9783030636715 - 9783030636722 ; , s. 1-25
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Bokkapitel (refereegranskat)abstract
- This introductory chapter sheds light on the opportunities and challenges that the digital era has in store for the European Union (EU) at a time when its fundamental values are being called into question by prominent political currents. The chapter sets the scene by an account of how previous periods of technological transformation affected European societies and considers the financial and regulatory resources at the disposal of the EU to manage the technological shift of the 2020s. The chapter introduces the book’s interdisciplinary approach, which offers various disciplinary perspectives on how the technological mega-shift impacts the EU’s ability to meet the multifaceted challenges it is facing. The chapter concludes that decision-makers at the national as well as European levels must be prepared to take a holistic perspective when addressing technological trends and seeking solutions to the problems that arise in the wake of changing economic and political conditions in society.
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