Sökning: "Wind power"

Visar resultat 16 - 20 av 405 avhandlingar innehållade orden Wind power.

  1. 16. Numerical Computations of Wakes Behind Wind Farms

    Författare :Ola Eriksson; Stefan Ivanell; Simon-Philippe Breton; Anna Rutgersson; Dan Henningson; Niels Troldborg; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Wind turbine; Wind power; Wind farm; Wakes; Long distance wakes; Farm-Farm; Farm to farm interaction; Wind farm cluster; Large Eddy simulations; LES; Actuator disc method; ACD; CFD; Ellipsys3D;

    Sammanfattning : More and larger wind farms are planned offshore. As the most suitable build sites are limited wind farms will be constructed near to each other in so called wind farm clusters. Behind the wind turbines in these farms there is a disrupted flow of air called a wake that is characterized by reduced wind speed and increased turbulence. LÄS MER

  3. 17. Numerical Computations of Wakes Behind Wind Farms : A tool to study Farm to Farm interaction

    Författare :Ola Eriksson; Stefan Ivanell; Anna Rutgersson; Simon-Philippe Breton; Philippe Chatelain; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Wind turbine; Wind power; Wind farm; Wakes; Long distance wakes; Farm-Farm; Farm to farm interaction; Wind farm cluster; Large Eddy simulations; LES; Actuator disc method; ACD; CFD; Ellipsys3D; Prescribed boundary layer; PBL; Forced boundary layer; FBL; Meteorologi; Meteorology;

    Sammanfattning : More and larger wind farms are planned offshore. As the most suitable sites to build are limited these new wind farms will be constructed near to each other in so called wind farm clusters. Behind the wind turbines in these farms there is a disrupted flow of air called a wake that is characterized by reduced wind speed and increased turbulence. LÄS MER

  4. 18. Frequency response by wind farms in power systems with high wind power penetration

    Författare :Mattias Persson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; inertia estimation; frequency control; power system stability; wind power integration; Power system; synthetic inertia;

    Sammanfattning : The integration of variable speed wind turbines (VSWT) in power systems is increasing in order to reduce the emission of green house gases. This increase of power electronic converter interfaced generation causes a decrease of power system inertia, increasing the risk of load shedding and system frequency instability. LÄS MER

  5. 19. Anteciperande förvaltning: tjänstemäns makt i kommunala policyprocesser om vindkraft

    Författare :Mats Bengtsson; Göteborgs universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Power; influence; discretion; administrator; politician; anticipation; power to; power over; public administration; local government; policy; policy process; case study; democracy; bureaucracy; wind power; Falkenberg; Halmstad; Sweden;

    Sammanfattning : .... LÄS MER

  7. 20. On Frequency Control Schemes in Power Systems with Large Amounts of Wind Power

    Författare :Camille Hamon; Lennart Söder; Magnus Perninge; Henrik Hult; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Wind power; Stochastic optimal power flows; Frequency control schemes; Tertiary frequency control; uncertainty; power systems;

    Sammanfattning : In recent years, large investments have been made in wind power, and this trend is expected to continue in the coming decades. Integrating more wind power in the production mix offers great opportunities for the society, such as reducing greenhouse gas emissions and the dependence on foreign fuel. LÄS MER