摘要
为进一步降低风力发电成本,采用15 MW及以上容量的风力机成为未来风电的主要发展趋势。为了研究土-结构相互作用(Soil Structure Interaction,SSI)效应对下一代超大型海上风力机动力学响应特性的影响,文章通过对FAST二次开发,基于一组线性弹簧建立了单桩式IEA 15 MW风力机的SSI模型,计算了常规发电工况以及极端停机工况下的机舱振动和支撑结构弯矩。计算结果表明:忽略SSI效应会导致发电工况下塔顶弯矩和泥面处支撑结构弯矩的预估值明显偏低,对极端停机工况下结构动力学响应影响不甚明显,考虑和忽略SSI效应时,50 a一遇极端工况下的疲劳损伤相差不足3%;但在风速较低时,SSI效应的影响十分明显,在风速为8 m/s的工况下,塔顶和泥面弯矩最大值的预估结果分别偏低37.6%和20.1%;考虑SSI效应时,由于基础存在垂向运动,产生了较大的机舱振动,显著增大了支撑结构在泥面处的疲劳损伤。以上结果说明了设计超大型海上风力机时考虑SSI效应的必要性。
In order to further reduce the cost of wind power,employing 15 MW or even higher capacity wind turbine has been the major development trend in the future wind energy market.This paper has developed the soil structure interaction model of the IEA 15 MW monopile wind turbine using a set of linear springs by improving the capability of FAST due to the demand of investigating the SSI effect on the dynamic responses of next-generation large offshore wind turbines.The nacelle vibration and bending moment of the support structure under normal power production and extreme conditions are obtained.The results indicate that the ignorance of SSI effect significantly underestimates the tow-er-top and mudline bending moments under power production load cases.The SSI effect has an insignificant influence on the dynamic responses of the wind turbine under the extreme conditions.Specifically,the fatigue damage of the support structure at the mudline is only predicted with an error lower than 3%under the 50-year return period extreme condition.Nonetheless,the SSI effect has a dominant influence for the low wind speed conditions.The tower top and mudline bending moments are underestimated by 37.6%and 20.1%,respectively,if the SSI effect is ignored.The axial mode of the foundation is activated,resulting in an intense nacelle vibration and a huge increase to the fatigue damage of the support structure.The study has verified that the SSI effect is mandatorily considered in the design of large offshore wind turbine structures.
作者
冷平
吕娜
赖踊卿
何奔
杨阳
Leng Ping;LÜNa;Lai Yongqing;He Ben;Yang Yang(China General Nuclear Power New Energy Holding Co.,Ltd.,Beijing 100160,China;China Power Construction East China Survey and Design Institute,Hangzhou 311100,China;Faculty of Maritime and Transportation,Ningbo University,Ningbo 315211,China)
出处
《可再生能源》
CAS
CSCD
北大核心
2024年第12期1635-1641,共7页
Renewable Energy Resources
基金
浙江省自然科学基金探索青年类项目(LQ22E090001,LQ23E090003)
中国博士后科学基金(2022M722960)
浙江省博士后科研择优资助项目
国家自然科学基金(52271294)。
