极端风况下兆瓦级风力机动力学特性研究
Dynamics Characteristic of Megawatt Wind Turbine Under Extreme Wind Conditions
李治国 1高志鹰 2张立茹 2汪建文2
作者信息
- 1. 内蒙古工业大学机械工程学院,内蒙古自治区 呼和浩特市 010051
- 2. 内蒙古工业大学能源与动力工程学院,内蒙古自治区 呼和浩特市 010051
- 折叠
摘要
鉴于强湍流和风向突变等极端风况导致风电机组事故频发的现状,该文提出一种适用于各种复杂风况的大型兆瓦级风力机动力学响应计算方法.将叶素动量理论、混合梁理论、有限单元法、修正的Newmark-β 法及Lanczos解耦技术相结合,考虑柔性风轮的非定常入流效应、剪切变形和离心刚化效应、气动-结构阻尼影响、柔性部件结构耦合及非线性大变形等特性,探究极端连续阵风和极端湍流风况下风力机的动力学特性.研究发现,风向角会引起冲击载荷效应致使叶片和塔筒位移在趋于稳定前出现较大突变现象;叶片挥舞变形受极端湍流脉动特性影响较大,纵向湍流分量导致塔筒前后方向振动剧烈.结果可为极端风况下风力机气弹稳定性能判定、风电机组整机刚柔耦合动力学仿真技术实现提供一定参考.
Abstract
Due to extreme wind conditions such as strong turbulence and sudden wind direction change,which frequently lead to serious accidents,a calculation method of dynamic response for large-scale megawatt wind turbine suitable for various complex wind conditions is proposed in this paper.The blade element momentum theory(BEM),hybrid beam theory,finite element method,modified Newmark-β method and Lanczos decoupling technology are combined together,and the dynamics characteristic such as unsteady inflow effect of flexible rotor,shear deformation and centrifugal stiffness effect,aerodynamic-structural damping effect,structural coupling between flexible components as well as nonlinear large deformation are taken into consideration.The dynamics characteristic of megawatt wind turbine under ETM(Extreme turbulence model)and ECD(Extreme coherent gust with direction change)conditions are further analyzed.Some interesting phenomena are found as follows.The wind direction angle will cause the overshoot in loading effect,resulting in a large sudden change of displacement for blades and towers before they tend to be stable.The flapwise blade deformation is greatly affected by the extreme turbulence.The longitudinal turbulence component will lead to severe vibration of a tower in the fore-aft and side-to side directions.The research method is of great significance for the determination of wind turbine aeroelastic stability under extreme wind conditions and the realization of rigid flexible coupling dynamics simulation technology.
关键词
兆瓦级风力机/极端风况/动态响应/动力学特性Key words
megawatt wind turbine/extreme wind conditions/dynamic response/dynamics characteristic引用本文复制引用
基金项目
国家自然科学基金(51866012)
内蒙古自治区自然科学基金(2023LHMS05031)
内蒙古自治区直属高校基本科研业务费项目(JY20240021)
内蒙古自治区直属高校基本科研业务费项目(JY20220240)
出版年
2024
国家科技期刊平台
NSTL
万方数据