海上风电筒型基础结构体系阻尼特性研究

RESEARCH ON DAMPING CHARACTERISTICS OF OFFSHORE WIND TURBINE SYSTEM SUPPORTED BY BUCKET FOUNDATION

针对某筒型基础海上风电结构,基于实测振动响应数据,采用随机子空间法对所测海上风电结构的阻尼进行识别,研究海上风电筒型基础结构在停机及运行状态下阻尼的变化规律。结果表明:在停机状态下,海上风电筒型基础结构的顺风向阻尼和横风向阻尼均随外界风速的增大呈增长趋势,两者的平均值分别为0.952%和0.973%;当风电机组处于运行状态时,顺风向运行阻尼随外界风速的增大呈增长趋势,阻尼平均值在3.87%~5.28%之间变化,而对于横风向运行阻尼,其变化趋势受外界因素的影响较小,阻尼平均值在整个风速范围内在1.74%~3.37%之间变化,横风向运行阻尼小于顺风向运行阻尼。

For an offshore wind turbine supported by bucket foundation,based on the measured vibration data on site,the stochastic subspace identification method was used to identify the damping of the measured offshore wind turbine structure,and the damping characteristics of the offshore wind turbine supported by bucket foundation under parked and operational conditions were studied. The results show that:in parked conditions,the along-wind and cross-wind damping of the offshore wind turbine supported by bucket foundation both increase with the increase of external wind speed,and the average values of these are 0.952% and 0.973%,respectively;in operational conditions,the along-wind damping shows an increasing trend with the increase of external wind speed,and its average damping value varies within the range of 3.87%-5.28%. For the cross-wind damping,its change trend is less affected by the external factors. The average value of cross-wind damping varies from 1.74% to 3.37% in the entire wind speed range,and the crosswind damping is smaller than the along-wind damping under operational conditions.