基于物理机制的风力发电高塔系统风场模拟

Wind Field Simulation of Wind Turbine Systems

摘要:

为了准确确定作用于桨叶和塔体的风荷载,研究了基于物理机制的风力发电高塔系统风场模拟问题.依据随机过程的随机函数描述,提出了基于物理机制的旋转Fourier互谱,有效地考虑了桨叶旋转效应和桨叶上不同点风速之间的相关性.然后,对旋转Fourier谱(随机Fourier谱)作逆Fourier变换,实现了桨叶(塔体)的风场模拟.最后,结合典型的1.25 MW三桨叶变桨距风力发电高塔系统，进行了纵向风速场数值仿真研究.算例表明,该算法可以准确地模拟给定风环境的风力发电高塔系统脉动风速时程.

Abstract:

In order to determine exact wind loads of the blades and the tower,wind field simulation of wind turbine systems is investigated.Based on the random function description of stochastic processes,the crossrotational Fourier spectrum based on the physical mechanism is proposed to consider the rotating effect and the correlation of two different wind velocities on the blades.Then,wind velocities on blades (or the tower) are generated through the inverse Fourier transformation of the rotational Fourier spectrum (or the random Fourier spectrum).Finally,an example involving simulation of longitudinal turbulent wind field of a 1.25MW wind turbine system is investigated.The result shows that the proposed algorithm is of high accuracy.