小尺度风特性建模与分析

MODELING AND ANALYSIS OF WIND CHARACTERISTICS WITH LITTLE PERIODS

根据工程需求,研究了一种直观、简便的小时间尺度风运动模型及其计算方法;根据风脉动为矢量的事实基础,分析了一种反映风特性关系的"湍流圆",并通过对实测风数据的统计分析,给出了包括风速和风向两个参变量的湍流和湍流强度计算。采用实测数据的验证表明,这种建模方法能够较好地反映小尺度气流的变化。与经典湍流强度等特征量的计算方法相比,风特征量的数值分析方法具有足够的工程精度,且实时性更强,可以用于确定风电机组动、静态设计过程的基本设计参数,同时也可以为风电机组运行过程提供控制基础参数,对确定捕获风能与偏航角的关系具有重要意义。

In order to establish the effect of the wind velocity, wind direction and turbulence on the wind turbine design and the response of the wind turbine components a simple and convenient micro scale wind model was built. Based on the fact that the wind velocity is a vector and the statistical model of ＂turbulence circle ＂with the period of about 50 minutes, which reflected the wind velocity and turbulence was built up. The actual test data showed that the wind model reflected the true wind changes well. The wind speed, direction and the turbulence intensity accorded with the test data well,and the arithmetic was more real-time when comparing with the classic turbulence intensity calculational method. The numeral values of the key wind property would be important to design of wind turbine, and to operation control system of wind turbine as well as to establishment of the yaw angle effect on wind energy capture.