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Title:
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Determination of load cases and critical design variables
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Author(s):
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Published by:
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Publication date:
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ECN
Wind Energy
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25-2-2010
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ECN report number:
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Document type:
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ECN-E--10-007
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ECN publication
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Number of pages:
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Full text:
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34
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Download PDF
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Abstract:
An overview of systems for which the Critical Design Variables (CDV’s) and a minimum set of
Design Load Cases (DLC’s) should be specified is given. At least drive train, pitch system and yaw
system should be considered, but the possibility of adding other components if required existed,
however the above mentioned three systems were sufficient. For each system the different
components have been specified that need to be considered in more detail with respect to design
loads than is currently the case in the standards and guidelines.
A specification of the CDV’s for these selected systems is discussed as well as the specification of
the (international) standards currently used. A minimum set of DLC’s for the selected systems is also
specified. For this purpose it has been determined whether the already specified DLC’s in standards
like IEC61400-1, GL guidelines for the Certification of Wind Turbines, and IEC61400-4 cover these
design load cases so that in case the design load is covered, the corresponding DLC’s are identified;
in case the design load is not covered, new DLC’s are proposed. Only three new DLC’s are
proposed, with the marginal note that strictly speaking they are not new DLC’s, they more illustrate
the lack in modelling possibilities in current tools. These new DLC’s concern the misalignment,
resonance and LVRT (Low Voltage Ride Through). Over all the DLC’s are well covered by the
current standards and guidelines.
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