Towards practical dynamic induction control of wind farms: analysis of optimally controlled wind-farm boundary layers and sinusoidal induction control of first-row turbines
Wake interactions between wind turbines in wind farms lead to reduced energy extraction in downstream rows. In recent work, optimization and large-eddy simulation were combined with the optimal dynamic induction control of wind farms to study the mitigation of these effects, showing potential po...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2018-06-01
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| Series: | Wind Energy Science |
| Online Access: | https://www.wind-energ-sci.net/3/409/2018/wes-3-409-2018.pdf |
| _version_ | 1811197686951444480 |
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| author | W. Munters J. Meyers |
| author_facet | W. Munters J. Meyers |
| author_sort | W. Munters |
| collection | DOAJ |
| description | Wake interactions between wind turbines in wind
farms lead to reduced energy extraction in downstream rows. In recent work,
optimization and large-eddy simulation were combined with the optimal dynamic
induction control of wind farms to study the mitigation of these effects,
showing potential power gains of up to 20 % (Munters and Meyers, 2017, Phil. Trans.
R. Soc. A, 375, 20160100, <a href="https://doi.org/10.1098/rsta.2016.010" target="_blank">https://doi.org/10.1098/rsta.2016.010</a>). However, the computational cost associated with
these optimal control simulations impedes the practical implementation of this
approach. Furthermore, the resulting control signals optimally react to the
specific instantaneous turbulent flow realizations in the simulations so
that they cannot be simply used in general. The current work focuses on the
detailed analysis of the optimization results of Munters and Meyers, with the
aim to identify simplified control strategies that mimic the optimal control
results and can be used in practice. The analysis shows that wind-farm
controls are optimized in a parabolic manner with little upstream propagation
of information. Moreover, turbines can be classified into first-row,
intermediate-row, and last-row turbines based on their optimal control
dynamics. At the moment, the control mechanisms for intermediate-row turbines
remain unclear, but for first-row turbines we find that the optimal controls
increase wake mixing through the periodic shedding of vortex rings. This behavior can
be mimicked with a simple sinusoidal thrust control strategy for first-row
turbines, resulting in robust power gains for turbines in the entrance region
of the farm. |
| first_indexed | 2024-04-12T01:18:38Z |
| format | Article |
| id | doaj.art-4e83b6f1c1094ceaa2fa81312ddf5b21 |
| institution | Directory Open Access Journal |
| issn | 2366-7443 2366-7451 |
| language | English |
| last_indexed | 2024-04-12T01:18:38Z |
| publishDate | 2018-06-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Wind Energy Science |
| spelling | doaj.art-4e83b6f1c1094ceaa2fa81312ddf5b212022-12-22T03:53:52ZengCopernicus PublicationsWind Energy Science2366-74432366-74512018-06-01340942510.5194/wes-3-409-2018Towards practical dynamic induction control of wind farms: analysis of optimally controlled wind-farm boundary layers and sinusoidal induction control of first-row turbinesW. Munters0J. Meyers1Department of Mechanical Engineering, KU Leuven, Celestijnenlaan 300A, 3001 Leuven, BelgiumDepartment of Mechanical Engineering, KU Leuven, Celestijnenlaan 300A, 3001 Leuven, BelgiumWake interactions between wind turbines in wind farms lead to reduced energy extraction in downstream rows. In recent work, optimization and large-eddy simulation were combined with the optimal dynamic induction control of wind farms to study the mitigation of these effects, showing potential power gains of up to 20 % (Munters and Meyers, 2017, Phil. Trans. R. Soc. A, 375, 20160100, <a href="https://doi.org/10.1098/rsta.2016.010" target="_blank">https://doi.org/10.1098/rsta.2016.010</a>). However, the computational cost associated with these optimal control simulations impedes the practical implementation of this approach. Furthermore, the resulting control signals optimally react to the specific instantaneous turbulent flow realizations in the simulations so that they cannot be simply used in general. The current work focuses on the detailed analysis of the optimization results of Munters and Meyers, with the aim to identify simplified control strategies that mimic the optimal control results and can be used in practice. The analysis shows that wind-farm controls are optimized in a parabolic manner with little upstream propagation of information. Moreover, turbines can be classified into first-row, intermediate-row, and last-row turbines based on their optimal control dynamics. At the moment, the control mechanisms for intermediate-row turbines remain unclear, but for first-row turbines we find that the optimal controls increase wake mixing through the periodic shedding of vortex rings. This behavior can be mimicked with a simple sinusoidal thrust control strategy for first-row turbines, resulting in robust power gains for turbines in the entrance region of the farm.https://www.wind-energ-sci.net/3/409/2018/wes-3-409-2018.pdf |
| spellingShingle | W. Munters J. Meyers Towards practical dynamic induction control of wind farms: analysis of optimally controlled wind-farm boundary layers and sinusoidal induction control of first-row turbines Wind Energy Science |
| title | Towards practical dynamic induction control of wind farms: analysis of optimally controlled wind-farm boundary layers and sinusoidal induction control of first-row turbines |
| title_full | Towards practical dynamic induction control of wind farms: analysis of optimally controlled wind-farm boundary layers and sinusoidal induction control of first-row turbines |
| title_fullStr | Towards practical dynamic induction control of wind farms: analysis of optimally controlled wind-farm boundary layers and sinusoidal induction control of first-row turbines |
| title_full_unstemmed | Towards practical dynamic induction control of wind farms: analysis of optimally controlled wind-farm boundary layers and sinusoidal induction control of first-row turbines |
| title_short | Towards practical dynamic induction control of wind farms: analysis of optimally controlled wind-farm boundary layers and sinusoidal induction control of first-row turbines |
| title_sort | towards practical dynamic induction control of wind farms analysis of optimally controlled wind farm boundary layers and sinusoidal induction control of first row turbines |
| url | https://www.wind-energ-sci.net/3/409/2018/wes-3-409-2018.pdf |
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