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Directional dependence of extreme load parameters for offshore wind turbines

Research output: Chapter in book/report/conference proceedingConference contributionResearchpeer review

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Original languageEnglish
Title of host publicationProceedings of the 25th International Ocean and Polar Engineering Conference, ISOPE 2015
PublisherInternational Society of Offshore and Polar Engineers
Pages489-496
Number of pages8
ISBN (electronic)9781880653890
Publication statusPublished - 2015
Event25th International Ocean and Polar Engineering Conference, ISOPE 2015 - Kona, Big Island, United States
Duration: 21 Jun 201526 Jun 2015

Publication series

NameProceedings of the International Offshore and Polar Engineering Conference
Volume2015-January
ISSN (Print)1098-6189
ISSN (electronic)1555-1792

Abstract

The correlation and direction dependence of extreme wind and wave load parameters with return periods of 50 or 100 years are hardly known. Existing approaches to determine these parameters are based on numerically simulated data or on combined data from different measurement locations. With the measurement platform FINO 1 synchronously measured time series of these parameters recorded over more than ten years in the German Bight are available for the first time. Measurement based investigations of the correlation and directional dependence of extreme load parameters are now possible. First evaluations indicate that extreme wind events often do not coincide with extreme sea state conditions. Direction dependencies of extreme wind speed and significant wave height were also detected. To analyze extreme rectified load effects the measurement data are subdivided into direction sectors. To extrapolate directionally dependent load parameters, different methods of extreme value analysis are used, taking different statistical population sizes into account. These directional extreme events are compared to each other and to extreme events without directional subdivision. As a result, ratio values of directionally dependent and independent extreme values of relevant load parameters are available. Thus, the influence of direction on the individual load parameters is quantified and the intensity of several rectified load effects can be estimated.

Keywords

    Design wave, Direction dependence, Offshore wind energy, Rectified loads, Sea state statistics, Waves, Wind

ASJC Scopus subject areas

Cite this

Directional dependence of extreme load parameters for offshore wind turbines. / Schmidt, Boso; Hansen, Michael; Marx, Steffen.
Proceedings of the 25th International Ocean and Polar Engineering Conference, ISOPE 2015. International Society of Offshore and Polar Engineers, 2015. p. 489-496 (Proceedings of the International Offshore and Polar Engineering Conference; Vol. 2015-January).

Research output: Chapter in book/report/conference proceedingConference contributionResearchpeer review

Schmidt, B, Hansen, M & Marx, S 2015, Directional dependence of extreme load parameters for offshore wind turbines. in Proceedings of the 25th International Ocean and Polar Engineering Conference, ISOPE 2015. Proceedings of the International Offshore and Polar Engineering Conference, vol. 2015-January, International Society of Offshore and Polar Engineers, pp. 489-496, 25th International Ocean and Polar Engineering Conference, ISOPE 2015, Kona, Big Island, United States, 21 Jun 2015.
Schmidt, B., Hansen, M., & Marx, S. (2015). Directional dependence of extreme load parameters for offshore wind turbines. In Proceedings of the 25th International Ocean and Polar Engineering Conference, ISOPE 2015 (pp. 489-496). (Proceedings of the International Offshore and Polar Engineering Conference; Vol. 2015-January). International Society of Offshore and Polar Engineers.
Schmidt B, Hansen M, Marx S. Directional dependence of extreme load parameters for offshore wind turbines. In Proceedings of the 25th International Ocean and Polar Engineering Conference, ISOPE 2015. International Society of Offshore and Polar Engineers. 2015. p. 489-496. (Proceedings of the International Offshore and Polar Engineering Conference).
Schmidt, Boso ; Hansen, Michael ; Marx, Steffen. / Directional dependence of extreme load parameters for offshore wind turbines. Proceedings of the 25th International Ocean and Polar Engineering Conference, ISOPE 2015. International Society of Offshore and Polar Engineers, 2015. pp. 489-496 (Proceedings of the International Offshore and Polar Engineering Conference).
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