基于中微尺度耦合模式的风电场风资源评估方法研究

针对传统风资源评估方法采用假设的入流风廓线模型而无法考虑宏观大气环流对风电场内风流动影响的问题,文章基于中尺度WRF模式和微尺度CFD模型,研究了基于中微尺度耦合模式的风资源评估方法。首先,建立基于WRF模式的中尺度数值模拟方法和基于CFD方法的微尺度风资源评估方法;其次,研究了中微尺度数值模拟方法的耦合原理,构建了从中尺度模拟结果中提取微尺度建模计算边界附近风速廓线的方法,建立了中微尺度耦合风资源评估流程;最后,通过某复杂山地风电场进行验证。验证结果表明,中尺度模拟结果可以改善微尺度CFD模型的入流边界条件,并有效降低风资源评估的误差。

Research on wind resource assessment method based on the coupled mesoscale-microscale framework

Traditional micro-scale wind resource assessment method cannot consider the effect of atmospheric flow in the periphery of the wind farm simulation area.Due to large spatial resolution,the meso-scale model cannot solve the problem between the atmospheric boundary layer and the wind turbine or the wind farm.Therefore,this paper combines mesoscale and microscale to achieve accurate wind resource assessment.Firstly,the numerical simulation methods of mesoscale WRF and microscale CFD are established.Secondly,the coupling principle of the two different scale numerical simulation methods is studied.At the same time,the method of extracting the wind speed profile near the calculating boundary of the micro-scale modeling from the meso-scale simulation results is also studied.Finally,a wind resource assessment method based on the meso-micro-scale coupling model was established.The verification results of complex mountainous wind farms show that compared with the traditional micro-scale CFD method,it is proved that the meso-micro scale coupling method improves the accuracy of wind speed assessment of wind farm by 1%,and achieves higher calculation accuracy.