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Interaction between large wind farms and the atmospheric boundary layer

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Volumetric LiDAR Scanning of a Wind Turbine Wake and Comparison with a 3D Analytical Wake Model

Fernando Porté Agel, Fernando Carbajo Fuertes

A correct estimation of the future power production is of capital importance whenever the feasibility of a future wind farm is being studied. This power estimation relies mostly on three aspects: (1) a reliable measurement of the wind resource in the area, ...

2016

Hub vortex instability within wind turbine wakes: Effects of wind turbulence, loading conditions, and blade aerodynamics

François Gallaire, Giacomo Valerio Iungo, Francesco Viola

The near wake of wind turbines is characterized by the presence of the hub vortex, which is a coherent vorticity structure generated from the interaction between the root vortices and the boundary layer evolving over the turbine nacelle. Bymoving downstrea ...

Amer Physical Soc2016

On the Wake Behind a Vertical Axis Wind Turbine in a Boundary Layer

Vincent François-Charles Rolin

Systematic dependence on fossil fuels has led to high levels of carbon emissions. These emissions play a key role in exacerbating climate change. As the negative effects of climate change become more apparent, more resources are being invested into finding ...

2016

Flow adjustment in a finite size wind farm in a neutral ABL

Varun Sharma, Marc Parlange, Marc Calaf Bracons

It is now well-recognized that in the presence of an asymptotically large wind farm, the ABL adjusts to this ‘enhanced’ roughness to form a fully developed ‘wind turbine array boundary layer’ (WTABL), where the driving force of the ABL is in balance with t ...

2016

Increasing wind energy production has become a unanimous plan for virtually all the developed countries. In addition to constructing new wind farms, this goal can be achieved by making wind farms more efficient. Control strategies in wind farms, such as ma ...

2016

Effect of Large Finite-Size Wind Farms and Their Wakes on Atmospheric Boundary Layer Dynamics

Fernando Porté Agel, Ka Ling Wu

Through the use of large-eddy simulation, the effect of large finite-size wind farms and their wakes on conventionally-neutral atmospheric boundary layer (ABL) dynamics and power extraction is investigated. Specifi- cally, this study focuses on a wind farm ...

2016

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A nonlinear adaptive path following controller for a kite based airborne wind energy system is presented. For a given desired geometric path, we provide necessary conditions for closed-loop convergence of the kite to a tube centered around the desired path ...

Ieee2016

In this article, a new model is developed to parameterize the effect of wind farms in large-scale atmospheric models such as weather models. In the new model, wind turbines in a wind farm are parameterized as elevated sinks of momentum and sources of turbu ...

Amer Inst Physics2015

A modeling framework is proposed and validated to simulate turbine wakes and associated power losses in wind farms. It combines the large-eddy simulation (LES) technique with blade element theory and a turbine-model-specific relationship between shaft torq ...

Pergamon-Elsevier Science Ltd2015

Optimization of an Airborne Wind Energy System using Constrained Gaussian Processes with Transient Measurements

Colin Neil Jones, Ioannis Lymperopoulos, Sanket Sanjay Diwale

Airborne wind energy systems are built to exploit the stronger and more consistent wind available at high altitudes that conventional wind turbines cannot reach. This however requires a reliable controller design that can keep the airborne system flying fo ...

2015