风切变指数在风电场风资源评估中的应用

Application of Wind Shear Index in the Assessment of Wind Resources of Wind Farm

以内蒙古地区3座70m高测风塔连续2年的实测数据来分析风切变指数的变化,结果表明:1)不同高度梯度的风切变指数受地面粗糙度及周围地形地貌的影响较大。2)计算相邻高度的风速时,采用相邻高度间的风切变指数计算得到的结果较好;计算相差较大的高度间风速时,采用拟合曲线得到的风切变指数计算得到的结果较好。3)利用3～25m/s的风切变指数计算各月风速及年均风速结果都与实测值最接近;而利用全部风速数据的风切变指数计算统计各月风速往往比实测值偏大;利用3～25m/s拟合曲线得到的风切变指数统计各月风速比实测值偏小。

This paper presents a study on changes of the wind shear index based upon the measured data of three 70-meter-high wind towers for 2 consecutive years in Inner Mongolia.The result of the study shows as below:1)the wind shear index at the different height gradient is greatly affected by ground roughness and the surrounding to pography.2)in calculating the wind speed adjacent to a certain height,adoption ofthe wind indexbetween the twoadjacent heights would result in a better output,while in calculating the w...