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  • 1751.
    Ågren, Olov
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Electricity. Avdelningen för elektricitetslära och åskforskning.
    Moiseyenko, Vladimir
    Savenko, Natalia
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Electricity. Avdelningen för elektricitetslära och åskforskning.
    Constants of motion in a minimum-B mirror magnetic field2005In: Physical Review E, Vol. 72, no 026408, p. 1-5Article in journal (Refereed)
  • 1752.
    Ågren, Olov
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Noack, Klaus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Moiseenko, V. E.
    Hagnestål, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Källne, Jan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Anglart, H.
    The Hybrid Reactor Project Based On The Straight Field Line Mirror Concept2012In: Fusion for Neutrons and Subcritical Nuclear Fission: Proceedings of the International Conference / [ed] Jan Källne, Dimitri Ryutov, Giuseppe Gorini, Carlo Sozzi, Marco Tardocchi, 2012, p. 173-185Conference paper (Refereed)
    Abstract [en]

    The straight field line mirror (SFLM) concept is aiming towards a steady-state compact fusion neutron source. Besides the possibility for steady state operation for a year or more, the geometry is chosen to avoid high loads on materials and plasma facing components. A comparatively small fusion hybrid device with "semi-poor" plasma confinement (with a low fusion Q factor) may be developed for industrial transmutation and energy production from spent nuclear fuel. This opportunity arises from a large fission to fusion energy multiplication ratio, Q(r) = P-fis/P-fus >> 1. The upper bound on Q(r) is primarily determined by geometry and reactor safety. For the SFLM, the upper bound is Q(r)approximate to 150, corresponding to a neutron multiplicity of k(eff) =0.97. Power production in a mirror hybrid is predicted for a substantially lower electron temperature than the requirement T-e approximate to 10 keV for a fusion reactor. Power production in the SFLM seems possible with Q approximate to 0.15, which is 10 times lower than typically anticipated for hybrids (and 100 times smaller than required for a fusion reactor). This relaxes plasma confinement demands, and broadens the range for use of plasmas with supra-thermal ions in hybrid reactors. The SFLM concept is based on a mirror machine stabilized by qudrupolar magnetic fields and large expander tanks beyond the confinement region. The purpose of the expander tanks is to distribute axial plasma loss flow over a sufficiently large area so that the receiving plates can withstand the heat. Plasma stability is not relying on a plasma flow into the expander regions. With a suppressed plasma flow into the expander tanks, a possibility arise for higher electron temperature. A brief presentation will be given on basic theory for the SFLM with plasma stability and electron temperature issues, RF heating computations with sloshing ion formation, neutron transport computations with reactor safety margins and material load estimates, magnetic coil designs as well as a discussion on the implications of the geometry for possible diagnostics. Reactor safety issues are addressed and a vertical orientation of the device could assist passive coolant circulation. Specific attention is put to a device with a 25 m long confinement region and 40 cm plasma radius in the mid-plane. In an optimal case (k(eff) = 0.97) with a fusion power of only 10 MW, such a device may be capable of producing a power of 1.5 GW(th).

  • 1753.
    Ågren, Olov
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Electricity. Avdelningen för elektricitetslära och åskforskning.
    Savenko, Natalia
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Electricity. Avdelningen för elektricitetslära och åskforskning.
    Magnetic mirror minimum B field with optimal ellipticity2004In: Physics of plasmas, Vol. 11, no 11Article in journal (Refereed)
  • 1754.
    Ågren, Olov
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Electricity. Avdelningen för elektricitetslära och åskforskning.
    Savenko, Natalia
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Electricity. Avdelningen för elektricitetslära och åskforskning.
    Minimum B field with optimal ellipticity and idea for improved axial confinement by tuned ICRH cycles2005In: Transactions of Fusion Science and Technology, ISSN 1536-1055, Vol. 47, no 1 T, p. 285-287Article in journal (Refereed)
  • 1755.
    Ågren, Olov
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Electricity. Avdelningen för elektricitetslära och åskforskning.
    Savenko, Natalia
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Electricity. Avdelningen för elektricitetslära och åskforskning.
    Rigid rotation symmetry of a marginally stable minimum B field and analytical expressions of the flux coordinates2005In: Physics of Plasmas, Vol. 12, no 042505, p. 1-5Article in journal (Refereed)
  • 1756.
    Ågren, Olov
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Electricity. Avdelningen för elektricitetslära och åskforskning.
    Savenko, Natalia
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Electricity. Avdelningen för elektricitetslära och åskforskning.
    Sloshing ion distribution function in a minimum B mirror field2005In: Physics of Plasmas, Vol. 12, no 022504, p. 1-5Article in journal (Refereed)
  • 1757.
    Ågren, Olov
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Electricity. Avdelningen för elektricitetslära och åskforskning.
    Savenko, Natalia
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Electricity. Avdelningen för elektricitetslära och åskforskning.
    Theoretical study of increased electron temperature in mirror machines by tuned ion cyclotron resonance heating cycles2005In: Physics of Plasmas, Vol. 12, no 022506, p. 1-10Article in journal (Refereed)
  • 1758.
    Ågren, Olov
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Electricity. Avdelningen för elektricitetslära och åskforskning.
    Savenko, Natalia
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Electricity. Avdelningen för elektricitetslära och åskforskning.
    Theoretical study of minimum B field with optimal ellipticity and scenario for increased electron temperature in mirror machines2004In: Annual Meeting Research Union Swedish Association - RUSA, Studsvik, Sweden, 20-21 April, 2004Conference paper (Other scientific)
  • 1759.
    Ågren, Olov
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Electricity. Avdelningen för elektricitetslära och åskforskning.
    Savenko, Natalia
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Electricity. Avdelningen för elektricitetslära och åskforskning.
    Theory of the straight field line mirror2005In: 32nd EPS Conference on Plasma Physics, 27 June - 1 July, Tarragona, Spain, 2005, p. Vol. 29 C, P-4.069Conference paper (Refereed)
  • 1760.
    Ågren, Olov
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity. elektricitetslära och åskforskning.
    Savenko, Natalja
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity. elektricitetslära och åskforskning.
    Reply to comment by Dr Kotelnikov on2006In: Physics of Plasmas, Vol. 13, p. 124701-Article in journal (Refereed)
  • 1761.
    Åhgren, Malin
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Framtidens elnät: En studie över hur olika framtidsscenarionpåverkar elnätskundens ekonomiska förutsättningar2017Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In association with Sweco Energuide, two different futurescenarios have been developed regarding how the power gridcustomers might use the power grid in 10 years. In the firstscenario, scenario high load, the customers will not use anyenergy storage or load management. As a result their power demandwill increase drastically. If the customers act as in the secondscenario, scenario low load, they will see the potential ininvesting in energy storage and load management to reduce theirpower grid costs. The study has explored the economic incentivesto invest in scenario low load, which factors will affect thechoice of scenario low load and what will push the customers tochoose between the scenarios.The purpose of the study has been fulfilled by hearing theexperts’ prognosis for the future and doing a net present valueanalysis to examine the economic incentives. Power grid companieswill charge the maximal power output and if the customer do notmake any active choices it will lead to higher electrical costs.The economic incentives are mainly dependent on which choices thecustomers make regarding how the car is charged. By choosing lowercharge power and by consuming the power during time periods withlower electrical costs the customer can find incentives to act asscenario low load. If there is a time dynamic tariff theincentives increases. Even though the battery technologies andload management techniques are constantly developed the costs aretoo high and reduce the profitability of scenario low load.

  • 1762.
    Åslund, Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Requirements on the backup discharge system of spillways2011Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Hydropower is the largest producer of

    renewable electricity in Sweden with a

    yearly mean production of 65TWh. A key

    aspect of hydropower is its’ ability to

    store energy in dams and therefore being

    able to adjust the production to the

    energy consumption. Since each river

    system in Sweden is different each dam

    is unique. The focus on dam safety

    issues has increased in Sweden during

    the last 15 years. SMHI has created more

    accurate flow models and new dam safety

    ideas have been obtained though

    international collaboration. The RIDAS

    guidelines for dam safety govern the

    hydro power companies’ dam safety work.

    Dams are rated after the consequence of

    a dam breach. The consequence class of a

    dam puts demands on the backup system. A

    consequence class 1 dam is to be

    dimensioned to withstand a 10000 year

    flow and is also required to have a

    backup system installed. In accordance

    to the demands set by RIDAS, Fortum have

    decided to do dam investigations called

    FDU on a regular basis. Due to a focus

    on dam safety Fortum are conducting dam

    safety increasing projects on several of

    their dams. Backup systems can be

    designed in many different ways and must

    be customized to fit the properties of

    the dam. By analyzing the river system,

    how the dam is designed and what the

    surroundings look like conclusions about

    what is needed in terms of backup system

    can be drawn.

  • 1763.
    Åström, Karl
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Productivity Improvements in Assembly: Vertical synchronous generators; Stator Core and Rotor Rim2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
  • 1764.
    Öberg, Jonas
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Lindeberg, Oscar
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences.
    Energikartläggning: av LKAB Logistik, samt energieffektiviseringsåtgärder2018Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This thesis concerns an energy audit of LKAB Logistics. According toswedish law a company the size of LKAB are required to make an energyaudit every four year. LKAB Logistics mainly transports refined ironore products between mines and harbours along the train track"Malmbanan". They also store iron ore products and load boats in theharbours in Narvik and Luleå. These kinds of operations have a highdemand for energy. This demand is met mostly with electricity.However, oil, gas, diesel and district heating are also consumed tomeet the energy demand. In total LKAB Logistics consume around 191GWh, where roughly 75% is of electricity. With such high demand,savings around 1-2% makes a significant difference, and there areopportunities and incentives to improve energy efficiency.Implementing staff that are responsible for energy work, makinginvestments in new electrical motors and more energy-efficient windowsare a few examples. Higher priority on energy saving and continuedprogress for a more efficient work place will most likely benefit thecompany's environmental goals and economy.

  • 1765.
    Ögren, Jim
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Simulation of a Self-bearing Cone-shaped Lorentz-type Electrical Machine2013Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Self-bearing machines for kinetic energy storage have the advantage of integrating the magnetic bearing in the stator/rotor configuration, which reduces the number of mechanical components needed compared with using separated active magnetic bearings. This master's thesis focus on building a MATLAB/Simulink simulation model for a self-bearing cone-shaped Lorenz-type electrical machine. The concept has already been verified analytically but no dynamic simulations have been made. The system was modeled as a negative feedback system with PID controllers to balance the rotor. Disturbances as signal noise, external forces and torques were added to the system to estimate system robustness. Simulations showed stability and promising dynamics, the next step would be to build a prototype. 

  • 1766.
    Örarbäck, Jonas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Självkörande fordon: En analys av energianvändning och kapacitet2015Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Self-driving cars are soon to become a reality to the commercial market. A self-driving car does not have a human operator, which enables some interesting characteristics. The main benefits are considered to be:

    • The number of accidents and traffic jams should be reduced.
    • Enhanced comfort.
    • Energy usage could be decreased while capacity could be increased.

    This study concerns the causes for improved energy efficiency. The reason for improved energy efficiency is mainly because of the variation in terms of acceleration, braking and distance holding are reduced. The vehicles are more intelligent and can work together as a unity. There are reasons to believe that self-driving cars will first operate in highway conditions. The study has therefore tried to estimate what the potential benefits could be in terms of energy usage and capacity when comparing two sets of traffic flows in such an environment. One set of traffic flow was symbolized by self-driving cars, and one set was composed by conventional vehicles. With the settings and conditions defining the simulations in this study one can expect positive effects in both in energy usage and capacity with a traffic flow symbolized by self-driving cars. When comparing the two sets, with an increasing traffic flow from non-congestion up to congestion, the results showed energy savings around 10 percent with self-driving cars. 

  • 1767.
    Örnborg, Bob
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Bussningstillverkning med industrirobot: till vågkraftverk2014Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Då värdens yta är upp till 70 % täckt av vatten finns det stor potential för energigenerering av vattnets vågrörelser. Uppsala universitet har beställt denna rapport då de har en prototyp av vågkraftgenerator för att kunna ta tillvara denna energitillgång. Då den produktionsmetod som beställaren idag använder är både dyr och tidskrävande behöver industrirobotar introduceras i produktionen.

    Rapporten kommer att undersöka om möjlighet finns att producera det två gummibaserade ändstopp som linjärgeneratorn behöver. De produktionsmetoderna som kommer att behandlas är stansning, vattenskärning och fräsning av EPDM Duro 65. Då kostnaderna har hög prioritering är den industrirobot som produktionsmetoden ska utföras med av en 23 år gammal modell.

    Rapporten kommer även att presentera ett färdigt förslag för att direkt kunna implementeras in i produktionen. Detta om resultatet uppnår de specifikationer som produktionsmetoden måste uppfylla för att kunna implementeras. Den kommer även att göra en ekonomisk beräkning för att se om projektet kan ha ett ekonomiskt intresse för beställaren. Rapporten kommer slutligen att ge förslag för fortsatta studier.

  • 1768.
    Örnkloo, Johannes
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Comparison between active and passive rectification for different types of permanent magnet synchronous machines2018Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    When using an intermittent source of energy such as wind power together with a synchronous machine a frequency converter system is needed to decouple the generator from the grid, due to the fluctuations in wind speed resulting in fluctuating electrical frequency. The aim of this master's thesis is to investigate how different types of rectification methods affect permanent magnet synchronous machines of different saliency ratios. A literature study was carried out to review the research within the area and to acquire the necessary knowledge to carry out the work. Two simulation models were created that include a permanent magnet synchronous generator driven by a wind turbine and connected to the grid via a frequency converter, where one model utilizes active rectification and one utilizes passive rectification. The simulation models were verified by carrying out an experiment on a similar setup, which showed that the simulation results coincide well with the results of the experiment. The results of the simulation study were then used to compare the rectification systems as well as investigate the affect that rotor saliency has on the system. It was shown that the active rectification provided a higher efficiency than the passive rectification system, however the saliency of the rotor had little effect on the system

  • 1769.
    Örnkloo, Matilda
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Compensating Unbalances in Synchronous Railway Traction Systems with Railway Power Conditioners2016Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The electrified railway presents significant challenges for the electrical grid. This is due to the characteristics of the constructed railway system. Trains are single-phase loads, fed by two adjacent phases from the grid. Feeding phases will change continuously at every substation. This load characteristic will lead to unbalances and poor power quality in the grid. The poor power quality is caused by the unbalance in currents, voltage drops along the line, and induced harmonics from power electronic devices used in traction.

     

    To decrease the impact of the railway traction system in the public grid, Static Var Compensators (SVCs) and Static Synchronous Compensators (STATCOMs) have been implemented. These installations offer voltage control, maintain balance and mitigate harmonics. This thesis investigates other power electronic technologies to improve the power quality in the grid for the 50 Hz railway traction system.

  • 1770.
    Österberg, David
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Multi-Body Unsteady Aerodynamics in 2D Applied to aVertical-Axis Wind Turbine Using a Vortex Method2010Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Vertical axis wind turbines (VAWT) have many advantages over traditional Horizontalaxis wind turbines (HAWT).One of the more severe problem of VAWTs are the complicated aerodynamicbehavior inherent in the concept. Incontrast to HAWTs the blades experience varying angle of attack during its orbitalmotion. The unsteady flowleads to unsteady loads, and hence, to increased risk for problems with fatigue.A tool for aerodynamic analysis of vertical axis wind turbines has been developed.The model, a Discrete vortex method, relies on conformal maps to simplify the taskto finding the flowaround cylinders. After the simplified problem has been solved with Kutta condition,using the Fast Fouriertransform, the solution is transformed back to the original geometry yielding the flowabout the turbine.The program can be used for quick predictions of the aerodynamic blade loads fordifferent turbines allowing the method to be validated by comparing the predictionsto experimental data from realvertical axis wind turbines. The agreement with experiment is good.

  • 1771.
    Östergård, Rickard
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Flywheel energy storage: a conceptucal study2011Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This master thesis was provided by ABB Cooperate Research in Västerås. This study has two major purposes: (1) to identify the characteristics of a flywheel energy storage system (FESS), (2) take the first steps in the development of a simulation model of a FESS.

    For the first part of this master thesis a literature reviews was conducted with focus on energy storage technologies in general and FESS in particular. The model was developed in the simulation environment PSCAD/EMTDC; with the main purpose to provide working model for future studies of the electrical dynamics of a flywheel energy storage system.

    The main conclusion of the literature review was that FESS is a promising energy storage solution; up to multiple megawatt scale. However, few large scale installations have so far been built and it is not a mature technology. Therefore further research and development is needed in multiple areas, including high strength composite materials, magnetic bearings and electrical machines. The model was implemented with the necessary control system and tested in a simulation case showing the operational characteristics. 

33343536 1751 - 1771 of 1771
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