A new analytical model for wind farm power prediction

Niayifar, Amin; Porté‐Agel, Fernando

doi:10.1088/1742-6596/625/1/012039

Cited by 93 publications

(102 citation statements)

References 15 publications

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“…More recently, the FLORIS model has been improved by incorporating the theoretical models of wake behavior and steering presented in Porté-Agel (2014, 2016) and Niayifar and Porté-Agel (2015). One of the improvements was the inclusion of turbulence to describe the wake recovery.…”

Section: Introductionmentioning

confidence: 99%

“…The basic conception of wake steering remains that a rotor operating in misaligned conditions creates a force perpendicular to the flow that generates the deflection in wake direction and decreases the thrust and overall velocity deficit in the wake. Further, based on Bastankhah and Porté-Agel (2014 and Niayifar and Porté-Agel (2015), the change in thrust also impacts recovery rate. Wind tunnel tests in Schottler et al (2017) and Bartl and Saetran (2017) show good agreement overall with these latest models.…”

Section: Introductionmentioning

confidence: 99%

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A simulation study demonstrating the importance of large-scale trailing vortices in wake steering

et al. 2018

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Abstract. In this paper, we investigate the role of flow structures generated in wind farm control through yaw misalignment. A pair of counter-rotating vortices is shown to be important in deforming the shape of the wake and in explaining the asymmetry of wake steering in oppositely signed yaw angles. We also demonstrate that vortices generated by an upstream turbine that is performing wake steering can deflect wakes of downstream turbines, even if they are themselves aligned.We encourage the development of improvements to control-oriented engineering models of wind farm control, to include the effects of these large-scale flow structures. Such a new model would improve the predictability of control-oriented models. Further, we demonstrate that the vortex structures created in wake steering can lead to greater impact on power generation than currently modeled in control-oriented models. We propose that wind farm controllers can be made more effective if designed to take advantage of these effects.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A simulation study demonstrating the importance of large-scale trailing vortices in wake steering

et al. 2018

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show abstract

“…More recently, the FLORIS model has been improved by incorporating the theoretical models of wake behavior and steering presented in Porté-Agel (2014, 2016); Niayifar and Porté-Agel (2015). One of the improvements was the 5 inclusion of turbulence to describe the wake recovery.…”

mentioning

confidence: 99%

“…The basic conception of wake steering remains that a rotor operating in misaligned conditions creates a force perpendicular to the flow that generates the deflection in wake direction and decreases the thrust and overall velocity deficit in the wake. Further, based on Porté-Agel (2014, 2016); Niayifar and Porté-Agel (2015), the change in thrust also impacts recovery rate. Wind tunnel tests in Schottler et al (2017) and Bartl and Saetran (2017) show good agreement overall with these latest models.…”

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confidence: 99%

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From wake steering to flow control

Fleming¹,

Annoni²,

Churchfield³

et al. 2017

Preprint

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Abstract. In this paper, we investigate the role of flow structures generated in wind farm control through yaw misalignment. A pair of counter-rotating vortices are shown to be important in deforming the shape of the wake and in explaining the asymmetry of wake steering in oppositely signed yaw angles. We motivate the development of new physics for control-oriented engineering models of wind farm control, which include the effects of these large-scale flow structures. Such a new model would improve the predictability of control-oriented models. Results presented in this paper indicate that wind farm control strategies, based 5 on new control-oriented models with new physics, that target total flow control over wake redirection may be different, and perhaps more effective, than current approaches. We propose that wind farm control and wake steering should be thought of as the generation of large-scale flow structures, which will aid in the improved performance of wind farms.

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Evaluation of Engineering Models for Large‐Scale Cluster Wakes With the Help of In Situ Airborne Measurements

zum Berge,

Centurelli,

Dörenkämper

et al. 2024

Wind Energy

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The planned expansion of wind energy in the German Bight is creating much more densely staggered wind farms and wind farm clusters. This results in a significantly greater influence of the generated wakes on energy production of neighboring wind farms. The Dornier‐128 research aircraft operated by the Technische Universität of Braunschweig was used to measure the wind field in the lee of single and multiple wind farm clusters in the German Bight on 4 days during July 2020 and July 2021. The data at 120 m aMSL (above mean sea level) were analyzed to identify wake areas and the wind speed decrease behind the wind farm clusters. The observations were then compared to a range of numerical data including the mesoscale model Weather Research and Forecasting (WRF) applying a wind farm parameterization (WRF with wind farm parameterization [WRF‐WF]) to model wake effects and an engineering model with different setups. A model calibrated on a single wind farm is established as the baseline. A modification with a lower wake recovery, the TurbOPark model, and a WRF‐coupled model make up the three additional declinations considered. Overall, the models compared well to the measurement data in the direct vicinity of the wind farms and up to 20–30 km downstream of the wind farm clusters. The accuracy in wind speed prediction of the model results decreased with distance to the wind farms, where the mesoscale model (WRF‐WF) exhibited a more consistent performance across varying distances.

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A new analytical model for wind farm power prediction

Cited by 93 publications

References 15 publications

A simulation study demonstrating the importance of large-scale trailing vortices in wake steering

A simulation study demonstrating the importance of large-scale trailing vortices in wake steering

From wake steering to flow control

Evaluation of Engineering Models for Large‐Scale Cluster Wakes With the Help of In Situ Airborne Measurements

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