基于等效风速的风电机组参数对输出功率波动和功率损失特性的影响

EFFECTS OF WIND TURBINES PARAMETERS ON OUTPUT POWER FLUCTUATION AND POWER LOSS CHARACTERISTICS BASED ON EQUIVALENT WIND SPEED

以大型三叶风电机组为例,研究发电机组参数对输出功率波动及功率损失的影响。首先建立包括风剪切和塔影效应的等效风速模型,推导输出功率和功率系数的数学模型,研究叶轮半径、塔筒高度、塔筒直径和叶片到塔筒中线的悬垂距离等相关参数对功率波动的频率、幅值、波长、波动区域等特性影响规律。然后建立功率损失的数学模型,研究风电机组参数通过风剪切和塔影效应对功率损失造成的影响规律。结果表明:不同参数通过风剪切和塔影效应对输出功率周期性波动及功率损失的影响规律不同,功率周期性波动的幅值及波长受塔筒直径和悬垂距离2个参数影响较大,而功率损失受叶轮半径和塔筒高度2个参数影响较大,但其作用效果相反:功率损失程度随叶轮半径的增大而增大,但随塔筒高度的增大而减小。

Taking a large-scale three-blade wind turbines(WT)as an example,the influence of WT parameters on power fluctuation and power loss of output power is studied.First,the equivalent wind speed model including wind shear and tower shadow effect is established,the mathematical model of output power and power coefficient is deduced.The WT parameters are analyzed,which include blade radius,tower height,tower diameter and blade-to-tower centerline distance.And the influence of the WT parameters on the frequency,amplitude,wavelength,and fluctuation area of power fluctuation are studied.Then,the mathematical model of power loss is established,and the influence of the WT parameters on the power loss through wind shear and tower shadow effect is studied.The results show that different parameters have different effects on output power and power loss through wind shear and tower shadow effects.The amplitude and wavelength of periodic power fluctuations are greatly affected by the two parameters of tower diameter and blade-totower centerline distance.But the power loss is greatly affected by the two parameters of blade radius and tower height,and the effect are opposite,power loss will increase with the blade radius increasing,however power loss will reduce with the tower height increasing.