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.authorWard, Dawn
dc.contributor.authorCollu, Maurizio
dc.contributor.authorSumner, Joy
dc.date.accessioned2019-07-12T09:08:46Z
dc.date.available2019-07-12T09:08:46Z
dc.date.issued2019-05-18
dc.description.abstractThe 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.identifier.citationWard D, Collu M, Sumner J. (2019) Reducing tower fatigue through blade back twist and active pitch-to-stall control strategy for a semi-submersible floating offshore wind turbine. Energies, Volume 12, Issue 10, 2019, Article number 1897en_UK
dc.identifier.cris23816204
dc.identifier.issn1996-1073
dc.identifier.urihttps://doi.org/10.3390/en12101897
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/14333
dc.language.isoenen_UK
dc.publisherMDPIen_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectfloating offshore wind turbine (FOWT)en_UK
dc.subjectpitch-to-stallen_UK
dc.subjectblade back twisten_UK
dc.subjecttower fore–aft momentsen_UK
dc.subjectnegative dampingen_UK
dc.subjectblade flapwise momenten_UK
dc.subjecttower axial fatigue lifeen_UK
dc.titleReducing tower fatigue through blade back twist and active pitch-to-stall control strategy for a semi-submersible floating offshore wind turbineen_UK
dc.typeArticleen_UK

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