叶片覆冰对风电机组关键结构安全性的影响

Effect of Blades Icing on Safety of Key Structures of Wind Turbine

为研究低温条件下叶片覆冰对风电机组关键部位振动频率、翼型气动性能、发电功率、极限载荷和疲劳载荷的影响,对某3.XMW风电机组在覆冰、未覆冰条件下,基于IEC61400-1标准、线性疲劳累计损伤理论、雨流循环计数法,通过仿真软件建立该机型覆冰、未覆冰两种模型并进行计算。计算结果表明,叶片覆冰导致叶片和塔筒振动降低,翼型升力系数降低,阻力系数升高,发电功率降低,覆冰条件下的叶根、旋转轮毂中心、固定轮毂中心、偏航中心、塔筒底部极限载荷和等效疲劳载荷增大,最大累计循环次数降低,其中叶片挥舞载荷增幅最大。研究成果可为叶片覆冰时机组优化提供参考。

In order to study the effects of blades icing on vibration frequency,aerodynamic performance of airfoil,power generation,ultimate load and fatigue load of key parts of wind turbine under low temperature conditions,based on IEC 61400-1 standard,the linear fatigue cumulative damage theory,and rain flow cycle counting method,simulation software was used to establish calculation models of 3.XMW wind turbine at the conditions of icing and non-icing.The results show that the blade ice coating causes the blade and tower barrel vibration frequency to decrease,the airfoil lift coefficient decreases,the drag coefficient increases,and the power generation decreases.Ultimate load and equivalent fatigue load at blades root increase,and the maximum cumulative cycle number decreases,the amplitude of blade swing load increases.The research provides a reference for unit optimization when the blade is covered with icing.