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IEC/TS 61400-9 Ed. 1.0 en:2025

Wind energy generation systems - Part 9: Probabilistic design measures for wind turbines
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IEC/TS 61400-9 Ed. 1.0 en:2025

Wind energy generation systems - Part 9: Probabilistic design measures for wind turbines

IEC/TS 61400-9 Ed. 1.0 en:2025

IEC TS 61400-9:2025 sets out minimum requirements to the use of probabilistic design measures in order to ensure the structural and mechanical integrity of wind turbines.

The document is based on the general approach in ISO 2394, which also forms the basis for IEC 61400-1.

In 61400-1, the design verification approach is based on deterministic design using safety factors. However, edition 4 of IEC 61400-1:2019 opens for introduction of probabilistic design in an informative annex specifying requirements to the calibration of structural material safety factors and structural design assisted by testing.

IEC 61400-1 is the governing standard.

This document provides appropriate methodologies and requirements for full probabilistic design by taking into account specific uncertainties on not only material properties but also on environmental conditions, design models and the degree of validation.

This document also provides provisions for semi-probabilistic design, including:

  • Reliability-based calibration of partial safety factors
  • Assessment of existing wind turbines

The probabilistic methods in this document are formulated generically and can be applied to structural and mechanical failure modes where a limit state equation can be formulated.

SDO IEC: International Electrotechnical Commission
Document Number IEC/TS 61400
Publication Date Not Available
Language en - English
Page Count 92
Revision Level 1.0
Supercedes
Committee 88
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