复杂地形下风资源软件Meteodyn WT的网格划分优化研究

OPTIMIZATION RESEARCH OF GRID-MESHING ON COMPLEX TERRAIN USING WIND ENERGY SOFTWARE METEODYN WT

对风资源软件Meteodyn WT中传统的等步长网格划分方法进行分析,并提出基于风向频率优化的网格划分方法,推导相关计算公式。依据具体工程实例,对两种方法进行对比研究,结果表明:采用传统等步长划分网格时,软件划分网格的方式不随工程项目主风向的不同而改变;采用该文提出的基于风向频率优化的网格划分方法,网格划分方式与工程项目的风分布相一致,可更合理地利用计算机资源,提高计算效率,计算结果可靠,对于风场区域分布较大或主风向特别明显的复杂地形尤为适用。此外,还提出在Meteodyn WT中使用两种网格划分方法的一些建议。

The conventional equal step-length grid-meshing method in wind energy software Meteodyn WT was analyzed, and the optimization grid-meshing method based on wind direction frequency was proposed, then the relevant formula was derived. Two methods were compared on the basis of specific project examples. The results show that the grid- meshing behavior of conventional equal step-length method does not change with main wind direction of specific project examples. However, the grid-meshing behavior of the optimization method based on wind direction frequencies is in accord with the wind direction distribution of project so that the optimization method can more reasonably use the computer resource, improve the calculation efficiency and acquire reliable calculation results. It is particularly suitable to the large wind farm region or the main wind-direction occurring evidently on the complex terrains. In addition, some suggestions of two grid-meshing methods are put forward to use in Meteodyn WT.