基于多失效模式的海上浮式风电机组结构可靠性研究

MULTI-MODE RELIABILITY ANALYSIS ON STRUCTURAL OF OFFSHORE FLOATING WIND TURBINE

为准确评估浮式海上风电机组结构服役安全性,提出一种基于多失效模式的可靠性评估方法。以美国国家可再生能源实验室(NREL)研制的5 MW浮式风力发电机组OC3 Hywind为目标模型,根据不同海况下浮式风电机组结构耦合动力响应分析结果,分析关键结构的不同失效模式,最后基于多失效模式的可靠性评估方法计算整体系统可靠性。结果表明,考虑串联系统,基于多失效模式可靠性分析方法得到的海上浮式风电机组结构整体的失效概率远高于单一模式失效概率,采用此方式评估结构可靠度更加安全准确。

To ensure the safety of offshore floating wind turbine system,a novel the liability assessment method based on comprehensive multi-failure modes is proposed in this paper. The OC3 floating spar(Hywind)with 5 MW baseline wind turbine developed by American National Renewable Energy Laboratory(NREL)is applied as the target model. The coupled dynamic responses of OC3-Hywind are simulated under various sea states. And the reliabilities of several critical members under both ultimate strength failure and fatigue failure modes are calculated respectively. Then,the multi-mode reliability assessment is applied to calculate the structural reliability. The results demonstrate that the failure probability of the offshore floating wind turbine by the multi-mode reliability assessment is greater than that of any single mode. It is more efficient and accurate to estimate the structural reliability by this method.