基于高海拔实测风速的脉动风速功率谱研究

Research on Wind Speed Spectrum Based on Field Measurement at High Altitude

为提升高原山地风电场设计的准确性,需要获取适合当地环境的脉动风速功率谱。基于四川省高原山地地区实测风速数据,提出了适用于当地高原山地风电场的水平脉动风速谱修正模型,通过有效性验证,修正后的谱函数更能反映该地区风的脉动特性,拟合效果得到明显提升。同时针对Davenport谱、Harris谱、Karman谱等常用经验风谱与实测风谱进行了对比分析,常用风谱在低频段高于实测风谱,而高频段低于实测风谱。随着平均风速增加,常用经验风谱拟合效果有所提升,但修正风谱拟合效果明显优于常用经验风谱。

In order to improve the design accuracy of plateau mountain wind farm,it is necessary to obtain the wind power spectrum suitable for local environment.Based on field measured data in a plateau mountain wind farm in Sichuan Province,a modified model of horizontal pulsating wind speed spectrum is proposed,which is applicable to the plateau mountain wind farms in the region.The validation shows that the modified wind spectrum can better reflect local wind characteristics and the fitting effect is significantly improved.Meanwhile,the common wind spectra,such as Davenport spectrum,Harris spectrum and Karman spectrum,are compared with field measured wind spectrum,and the results show that the common wind spectra are higher than the measured wind spectrum in low frequency band,while is lower than the measured wind spectrum in high frequency band.With the increase of mean wind speed,the fitting effect of common wind spectra is improved,but the fitting effect of modified wind spectrum is obviously superior to common wind spectra.