Wind Energy Dissertation

Showing result 1 - 5 of 128 swedish dissertations containing the words wind turbines.

  • 1. Wind-wave interaction effects on offshore wind energy

    University dissertation from Department of Energy Sciences, Lund University

    Author :Ali Al Sam; Lunds universitet.; Lund University.; [2016-11]
    Keywords :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; wind-wave; swell; atmospheric boundary layer; marine atmospheric boundary layer; atmospheric turbulence; Large-eddy simulation; actuator line; wind sea; offshore technology; wind energy; wind turbine; aerodynamic;

    Abstract : This thesis is devoted to the investigation of the impacts of fast moving ocean surface waves on the aerodynamics of offshore wind turbines. The impacts of non-locally generated waves (swell) on the Marine Atmospheric BoundaryLayer (MABL) and thereby on offshore wind turbine aerodynamics are studied numerically by using Large Eddy Simulations and the Actuator Line Method. READ MORE

  • 2. Fault Behavior of Wind Turbines

    University dissertation from Department of Energy Sciences, Lund University

    Author :Francesco Sulla; Lunds universitet.; Lund University.; [2012]
    Keywords :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Wind Turbines; Short-Circuit Currents; Doubly-Fed Induction Generator; Grid Fault Ride-Through; Voltage Support; Weak Grid;

    Abstract : Popular Abstract in Swedish Andelen vindkraft i elnätet har ständigt ökat under de senaste åren. I många länder utgör idag vindkraften en betydande del av den totala elproduktionen. READ MORE

  • 3. The Power Qualities of Wind Turbines

    University dissertation from Chalmers University of Technology

    Author :Åke Larsson; Chalmers tekniska högskola.; Chalmers University of Technology.; [2000]
    Keywords :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Elektroteknik; elektronik och fotonik; Electrical engineering; electronics and photonics; power quality; wind turbines; measurements; flicker; frequency variations;

    Abstract : The power quality of wind turbines is dealt with in this dissertation. The thesis consists of four parts. The first part describes the electrical systems used in wind turbines. The second part presents the results of measurements of different types of wind turbines connected to different types of grids. READ MORE

  • 4. Human response to wind turbine noise perception, annoyance and moderating factors

    University dissertation from Göteborg : Occupational and Environmental Medicine, Department of Public Health and Community Medicine, Institute of Medicine, The Sahlgrenska Academy, Göteborg University

    Author :Eja Pedersen; Högskolan i Halmstad.; Göteborgs universitet.; Gothenburg University.; [2007]
    Keywords :NATURVETENSKAP; NATURAL SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; NATURAL SCIENCES; NATURVETENSKAP; Noise; Environmental exposure; Wind; Audio-visual interaction; Low-level noise exposure; wind turbines; noise annoyance; sound perception; audio-visual interaction; low-level noise exposure;

    Abstract : Aims: The aims of this thesis were to describe and gain an understanding of how people who live in the vicinity of wind turbines are affected by wind turbine noise, and how individual, situational and visual factors, as well as sound properties, moderate the response.Methods: A cross-sectional study was carried out in a flat, mainly rural area in Sweden, with the objective to estimate the prevalence of noise annoyance and to examine the dose-response relationship between A-weighted sound pressure levels (SPLs) and perception of and annoyance with wind turbine noise. READ MORE

  • 5. Dynamic Models of Wind Turbines

    University dissertation from Chalmers University of Technology

    Author :Abram Perdana; Chalmers tekniska högskola.; Chalmers University of Technology.; [2008]
    Keywords :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Elkraftteknik; Electric power engineering; wind turbine; modeling; validation; fixed-speed; variable-speed; power system stability; voltage stability; frequency stability; aggregated model;

    Abstract : The impact of wind power generation in the power system is no longer negligible. Therefore, there is an urgent need for wind turbine models that are capable of accurately simulating the interaction between wind turbines or wind farms and the power system. READ MORE

  • Abstract

    The release of carbon dioxide from the burning of fossil fuels for energy is thought to be one of the main contributors to increasing greenhouse gas concentrations in the atmosphere. This increase is reported to be causing irreversible changes to the earth’s climate, giving rise to temperature increases and other consequent alterations in weather patterns. Amid growing concern about climate change and its impact on the world, targets have been set through agreements such as the Kyoto Protocol and via European Union and government legislation to force countries to work towards decreasing their greenhouse gas emissions. Increasing the contribution that renewable sources make to energy production is a major part of most countries’ strategies to meet these targets. The UK has arguably the greatest potential for wind power generation in Europe and the government is seeking to build upon this strength by exploiting the resource further. The liberalised electricity market infers a requirement for private investment in order to develop the wind portfolio and this in turn requires financial and economic feasibility. Given the changes in weather patterns that are projected to occur over the course of the coming century, the possibility that this could change the UK’s wind resource, and hence the financial viability of wind power developments, must be addressed. Other aspects of how changes in the wind resource could impact on the operation of the fragmented electricity system ought also to be considered in this context. This thesis attempts to understand how the current generation of climate models project surface wind climate to change, and seeks to make the model information relevant at a site level by using statistical and physical modelling techniques. The projected changes indicated by the models are small, and it has been assessed that potential impacts on the electricity system, from project feasibility to the potential for inclusion of wind in the generation mix, will be limited.

    URI
    http://hdl.handle.net/1842/4034

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