This paper investigates the influence of system-level innovations on the fatigue life of jacket substructures for offshore wind turbines. The innovations consist of active control strategies as individual pitch control and individual flap control. Further the effect of a magnetic pseudo direct-drive generator (PDD) mounted upfront the rotor is investigated. Fully-coupled aeroelastic simulations are performed for 10 MW and 20 MW wind turbines, with the selected innovations, supported by jacket structures under specific met-ocean conditions at 50 m of water depth. Fatigue limit states at the jacket’ welded joints are evaluated based on S-N curves and Miner’s rule according to DNV-RP-C203 guideline. Results show the potential of advanced control systems to reduce stresses at jacket members. Few design challenges characterize PDD models, as increased tower base torsional loads and excitation of global bending modes may be critical for jacket’s members. Altogether, this study indicates the benefit of an integrated-iterative design approach for jacket substructures, where system-level parameters are iterated along with the jacket design parameters using fully-coupled models.
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ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering
June 17–22, 2018
Madrid, Spain
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-5131-9
PROCEEDINGS PAPER
Influence of System Level Parameters on the Fatigue Life of Jacket Substructures for 10 MW and 20 MW Wind Turbines
Davide Conti,
Davide Conti
Technical University of Denmark, Roskilde, Denmark
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Anand Natarajan,
Anand Natarajan
Technical University of Denmark, Roskilde, Denmark
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Asger Bech Abrahamsen
Asger Bech Abrahamsen
Technical University of Denmark, Roskilde, Denmark
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Davide Conti
Technical University of Denmark, Roskilde, Denmark
Anand Natarajan
Technical University of Denmark, Roskilde, Denmark
Asger Bech Abrahamsen
Technical University of Denmark, Roskilde, Denmark
Paper No:
OMAE2018-77568, V010T09A055; 10 pages
Published Online:
September 25, 2018
Citation
Conti, D, Natarajan, A, & Bech Abrahamsen, A. "Influence of System Level Parameters on the Fatigue Life of Jacket Substructures for 10 MW and 20 MW Wind Turbines." Proceedings of the ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. Volume 10: Ocean Renewable Energy. Madrid, Spain. June 17–22, 2018. V010T09A055. ASME. https://doi.org/10.1115/OMAE2018-77568
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