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dc.contributor.authorSmilden, Emil
dc.contributor.authorBachynski, Erin Elizabeth
dc.contributor.authorSørensen, Asgeir Johan
dc.contributor.authorAmdahl, Jørgen
dc.date.accessioned2019-04-11T08:47:30Z
dc.date.available2019-04-11T08:47:30Z
dc.date.created2018-12-20T09:32:58Z
dc.date.issued2019
dc.identifier.citationWind Energy. 2019, 22 (1), 89-108.nb_NO
dc.identifier.issn1095-4244
dc.identifier.urihttp://hdl.handle.net/11250/2594168
dc.description.abstractThe dimensions of offshore wind turbine (OWT) support structures are governed by fatigue considerations. For 6‐ to 10‐MW OWTs, wave loads are often dominating in terms of fatigue utilization. The present work proposes a control scheme to reduce the wave‐induced fatigue loads in OWT support structures. The control scheme applies collective pitch control to increase both the damping and stiffness of the fore‐aft vibration modes. With conventional active tower damping, efficient wave disturbance rejection is restricted to a narrow frequency range around the first fore‐aft modal frequency. The proposed control scheme achieves efficient wave disturbance rejection across a broader frequency range. Here, tower feedback control is implemented via an auxiliary control loop. Based on a low‐fidelity model, the effect of the tower feedback loop on the stability margins of the basic controller is analysed. The results show that, within certain boundaries, the stability margins are improved by the stiffness term in the tower feedback loop. Consequently, the need to reduce the bandwidth of the basic controller to accommodate tower feedback control is relaxed. Based on time‐domain simulations carried out in an aero‐hydro‐servo‐elastic simulation tool, the lifetime effects of the proposed control scheme are analysed. Compared with conventional active tower damping, a more favourable trade‐off between adverse side effects and the support structure's fatigue damage is achieved with the proposed control scheme.nb_NO
dc.language.isoengnb_NO
dc.publisherWileynb_NO
dc.titleWave disturbance rejection for monopile offshore wind turbinesnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.source.pagenumber89-108nb_NO
dc.source.volume22nb_NO
dc.source.journalWind Energynb_NO
dc.source.issue1nb_NO
dc.identifier.doi10.1002/we.2273
dc.identifier.cristin1645993
dc.relation.projectNorges forskningsråd: 223254nb_NO
cristin.unitcode194,64,20,0
cristin.unitnameInstitutt for marin teknikk
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode2


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