Reducing tower fatigue through blade back twist and active pitch-to-stall control strategy for a semi-submersible floating offshore wind turbine

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dc.contributor.author Ward, Dawn
dc.contributor.author Collu, Maurizio
dc.contributor.author Sumner, Joy
dc.date.accessioned 2019-07-12T09:08:46Z
dc.date.available 2019-07-12T09:08:46Z
dc.date.issued 2019-05-18
dc.identifier.citation Ward D, Collu M, Sumner J. Reducing tower fatigue through blade back twist and active pitch-to-stall control strategy for a semi-submersible floating offshore wind turbine. Energies, 2019, Volume 12, Issue 10, Article number 1897 en_UK
dc.identifier.issn 1996-1073
dc.identifier.uri https://doi.org/10.3390/en12101897
dc.identifier.uri http://dspace.lib.cranfield.ac.uk/handle/1826/14333
dc.description.abstract The necessity of producing more electricity from renewable sources has been driven predominantly by the need to prevent irreversible climate chance. Currently, industry is looking towards floating offshore wind turbine solutions to form part of their future renewable portfolio. However, wind turbine loads are often increased when mounted on a floating rather than fixed platform. Negative damping must also be avoided to prevent tower oscillations. By presenting a turbine actively pitching-to-stall, the impact on the tower fore–aft bending moment of a blade with back twist towards feather as it approaches the tip was explored, utilizing the time domain FAST v8 simulation tool. The turbine was coupled to a floating semisubmersible platform, as this type of floater suffers from increased fore–aft oscillations of the tower, and therefore could benefit from this alternative control approach. Correlation between the responses of the blade’s flapwise bending moment and the tower base’s fore–aft moment was observed with this back-twisted pitch-to-stall blade. Negative damping was also avoided by utilizing a pitch-to-stall control strategy. At 13 and 18 m/s mean turbulent winds, a 20% and 5.8% increase in the tower axial fatigue life was achieved, respectively. Overall, it was shown that the proposed approach seems to be effective in diminishing detrimental oscillations of the power output and in enhancing the tower axial fatigue life. en_UK
dc.language.iso en en_UK
dc.publisher MDPI en_UK
dc.rights Attribution 4.0 International *
dc.rights.uri http://creativecommons.org/licenses/by/4.0/ *
dc.subject floating offshore wind turbine (FOWT) en_UK
dc.subject pitch-to-stall en_UK
dc.subject blade back twist en_UK
dc.subject tower fore–aft moments en_UK
dc.subject negative damping en_UK
dc.subject blade flapwise moment en_UK
dc.subject tower axial fatigue life en_UK
dc.title Reducing tower fatigue through blade back twist and active pitch-to-stall control strategy for a semi-submersible floating offshore wind turbine en_UK
dc.type Article en_UK


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