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Medientyp:
E-Artikel
Titel:
Vertical wake deflection for floating wind turbines by differential ballast control
Beteiligte:
Nanos, Emmanouil M.;
Bottasso, Carlo L.;
Tamaro, Simone;
Manolas, Dimitris I.;
Riziotis, Vasilis A.
Erschienen:
Copernicus GmbH, 2022
Erschienen in:
Wind Energy Science, 7 (2022) 4, Seite 1641-1660
Sprache:
Englisch
DOI:
10.5194/wes-7-1641-2022
ISSN:
2366-7451
Entstehung:
Anmerkungen:
Beschreibung:
Abstract. This paper presents a feasibility analysis of vertical wake steering for floating turbines by differential ballast control. This new concept isbased 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. This study considers the application of differential ballast control to a conceptual 10 MW 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-steeringturbine and at various downstream distances in its wake; (b) the effects of tilting on fatigue and ultimate loads, limitedly to one of the twoturbine-platform layouts; and (c) for both configurations, the necessary amount of water movement, the time to achieve a desired attitude, and theassociated energy expenditure. Results indicate that – in accordance with previous research – steering the wake towards the sea surface leads to larger power gains than steeringit towards the sky. Limitedly to the structural analysis conducted on one of the turbine-platform configurations, it appears that these gains can beobtained with only minor effects on loads, assuming a cautious application of vertical steering only in benign ambient conditions. Additionally, itis found that rotor tilt can be achieved on the order of minutes for the lighter of the two configurations, with reasonable water ballast movements. 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.