Vertical wake deflection for floating wind turbines by differential ballast control
<p>This paper presents a feasibility analysis of vertical wake steering for floating turbines by differential ballast control. This new concept is based on the idea of pitching the floater with respect to the water surface, thereby achieving a desired tilt of the turbine rotor disk. The pitch...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2022-08-01
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| Series: | Wind Energy Science |
| Online Access: | https://wes.copernicus.org/articles/7/1641/2022/wes-7-1641-2022.pdf |
| _version_ | 1811221319563345920 |
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| author | E. M. Nanos C. L. Bottasso S. Tamaro D. I. Manolas V. A. Riziotis |
| author_facet | E. M. Nanos C. L. Bottasso S. Tamaro D. I. Manolas V. A. Riziotis |
| author_sort | E. M. Nanos |
| collection | DOAJ |
| description | <p>This paper presents a feasibility analysis of vertical wake steering for floating turbines by differential ballast control. This new concept is
based on the idea of pitching the floater with respect to the water surface, thereby achieving a desired tilt of the turbine rotor disk. The pitch attitude is controlled by moving water ballast among the columns of the floater.</p>
<p>This study considers the application of differential ballast control to a conceptual 10 <span class="inline-formula">MW</span> wind turbine installed on two platforms, differing in size, weight, and geometry. The analysis considers the following: (a) the aerodynamic effects caused by rotor tilt on the power capture of the wake-steering
turbine and at various downstream distances in its wake; (b) the effects of tilting on fatigue and ultimate loads, limitedly to one of the two
turbine-platform layouts; and (c) for both configurations, the necessary amount of water movement, the time to achieve a desired attitude, and the
associated energy expenditure.</p>
<p>Results indicate that – in accordance with previous research – steering the wake towards the sea surface leads to larger power gains than steering
it towards the sky. Limitedly to the structural analysis conducted on one of the turbine-platform configurations, it appears that these gains can be
obtained with only minor effects on loads, assuming a cautious application of vertical steering only in benign ambient conditions. Additionally, it
is found that rotor tilt can be achieved on the order of minutes for the lighter of the two configurations, with reasonable water ballast movements.</p>
<p>Although the analysis is preliminary and limited to the specific cases considered here, results seem to suggest that the concept is not unrealistic and should be further investigated as a possible means to achieve variable tilt control for vertical wake steering in floating turbines.</p> |
| first_indexed | 2024-04-12T07:57:23Z |
| format | Article |
| id | doaj.art-31bd10d27ed14836b20e24ef6607b0a2 |
| institution | Directory Open Access Journal |
| issn | 2366-7443 2366-7451 |
| language | English |
| last_indexed | 2024-04-12T07:57:23Z |
| publishDate | 2022-08-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Wind Energy Science |
| spelling | doaj.art-31bd10d27ed14836b20e24ef6607b0a22022-12-22T03:41:26ZengCopernicus PublicationsWind Energy Science2366-74432366-74512022-08-0171641166010.5194/wes-7-1641-2022Vertical wake deflection for floating wind turbines by differential ballast controlE. M. Nanos0C. L. Bottasso1S. Tamaro2D. I. Manolas3V. A. Riziotis4Wind Energy Institute, Technische Universität München, 85748 Garching b. München, GermanyWind Energy Institute, Technische Universität München, 85748 Garching b. München, GermanyWind Energy Institute, Technische Universität München, 85748 Garching b. München, GermanySchool of Mechanical Engineering, National Technical University of Athens, 15780 Athens, GreeceSchool of Mechanical Engineering, National Technical University of Athens, 15780 Athens, Greece<p>This paper presents a feasibility analysis of vertical wake steering for floating turbines by differential ballast control. This new concept is based on the idea of pitching the floater with respect to the water surface, thereby achieving a desired tilt of the turbine rotor disk. The pitch attitude is controlled by moving water ballast among the columns of the floater.</p> <p>This study considers the application of differential ballast control to a conceptual 10 <span class="inline-formula">MW</span> wind turbine installed on two platforms, differing in size, weight, and geometry. The analysis considers the following: (a) the aerodynamic effects caused by rotor tilt on the power capture of the wake-steering turbine and at various downstream distances in its wake; (b) the effects of tilting on fatigue and ultimate loads, limitedly to one of the two turbine-platform layouts; and (c) for both configurations, the necessary amount of water movement, the time to achieve a desired attitude, and the associated energy expenditure.</p> <p>Results indicate that – in accordance with previous research – steering the wake towards the sea surface leads to larger power gains than steering it towards the sky. Limitedly to the structural analysis conducted on one of the turbine-platform configurations, it appears that these gains can be obtained with only minor effects on loads, assuming a cautious application of vertical steering only in benign ambient conditions. Additionally, it is found that rotor tilt can be achieved on the order of minutes for the lighter of the two configurations, with reasonable water ballast movements.</p> <p>Although the analysis is preliminary and limited to the specific cases considered here, results seem to suggest that the concept is not unrealistic and should be further investigated as a possible means to achieve variable tilt control for vertical wake steering in floating turbines.</p>https://wes.copernicus.org/articles/7/1641/2022/wes-7-1641-2022.pdf |
| spellingShingle | E. M. Nanos C. L. Bottasso S. Tamaro D. I. Manolas V. A. Riziotis Vertical wake deflection for floating wind turbines by differential ballast control Wind Energy Science |
| title | Vertical wake deflection for floating wind turbines by differential ballast control |
| title_full | Vertical wake deflection for floating wind turbines by differential ballast control |
| title_fullStr | Vertical wake deflection for floating wind turbines by differential ballast control |
| title_full_unstemmed | Vertical wake deflection for floating wind turbines by differential ballast control |
| title_short | Vertical wake deflection for floating wind turbines by differential ballast control |
| title_sort | vertical wake deflection for floating wind turbines by differential ballast control |
| url | https://wes.copernicus.org/articles/7/1641/2022/wes-7-1641-2022.pdf |
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