Service Communautaire d'Information sur la Recherche et le Développement - CORDIS

Extrapolation of extreme response

Scientific aspects of the result:
The newly introduced requirement in general wind turbine standards (IEC 61400-1) of assessment of extreme load effects during normal operation by use of extrapolation methods ideally requires enormous amounts of simulations. Investigations have been carried out in order to determine possible simplifications.

Social and commercial aspects of the result:
There has been an immediate need for the project. Currently and over the next few years, the expansion in offshore wind energy, especially in Europe, accelerates and at project start there were no thorough and coherent guidelines for the design of offshore wind power plants. The existing offshore standards are not suitable to cover the offshore wind energy technology.

A combination of these offshore standards and the existing onshore wind energy standards is a very complex process and significant technology gaps exist. One of the major tasks of the project has been the attempt to combine the practices of wind turbines engineering and offshore engineering. According to the main results stated in the executive summary the project has succeeded in this, and thus it is the view of the project partners that the project outcome has aided a development with the potential of preventing erroneous decision-making on large investments in Europe on a technical weak basis.

Potential applications for and End-users of the result:
End-users are designers of offshore wind turbines i.e. manufactures, certifying bodies, writers of standards and regulations, and possibly owners and operators of offshore wind farms.

Innovative features:
Methods of extrapolation have been extensively used in the design of offshore installations for gas and oil exploitation. Here similar methods have been applied to offshore wind turbines with the extra complications that wind and wave loads may contribute equally, making it difficult to neglect just one of them, and the control/safety system of the turbines introduces extra requirements to the numerical simulation scheme. Both these issues have been addressed and proposals for their proper treatment provided.

Reported by

RISØ NATIONAL LABORATORY, WIND ENDERGY DEPT.
Frederiksborgvej 399, VEA-118, P.O. Box 49
4000 Roskilde
Denmark
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