风力发电系统 第9部分：风力涡轮机概率设计措施

[中文适用范围]： IEC TS 61400-9:2025 规定了在确保风力发电机组结构和机械完整性方面使用概率设计方法的最低要求。该文件基于ISO 2394中的一般方法，而ISO 2394也是IEC 61400-1的基础。在IEC 61400-1中，设计验证方法基于使用安全系数的确定性设计。然而，IEC 61400-1:2019第4版在附录中引入了概率设计方法，并规定了结构材料安全系数的校准要求以及通过测试辅助结构设计的相关要求。IEC 61400-1是主导标准。本文件提供了全面的概率设计方法和相关要求，充分考虑了材料属性、环境条件、设计模型及验证程度等方面的不确定性。本文件还提供了半概率设计的方案，包括基于可靠性的部分安全系数校准以及现有风力发电机组的评估。本文件中的概率方法以通用形式提出，适用于可以建立极限状态方程的结构和机械失效模式。 [外文原描述]： 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 and 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.