架空输电线路非平稳台风风场数值模拟与验证

为了实现架空输电线路非平稳台风风场模拟,考虑非平稳脉动风场的紊流强度和阵风因子特性及其影响,提出了一种架空输电线路非平稳台风风场的模拟方法。首先利用Spline插值方法生成时变平均风速,采用更新时变平均风速的谐波合成法模拟脉动风速,然后基于三向风谱功率密度函数,构建了台风风场的时变功率谱,计入风场空间上的相关性,获取了调制进化功率谱,并与模拟台风功率谱比较；最后以某架空输电线路为例,验证了台风模拟方法的合理性。研究结果表明：随着基本时距的增加,台风的非平稳因素所占比重越大；本文提出的输电线路非平稳台风模拟方法合理有效。

Numerical simulation and verification of unsteady typhoon wind fields on overhead transmission lines

In order to simulate the non-stationary typhoon wind field of overhead transmission lines, a simulation method for the non-stationary typhoon wind field of overhead transmission lines is proposed, taking into account the turbulence intensity and gust factor characteristics and their effects of the non-stationary pulsating wind field. Firstly, the Spline interpolation method is used to generate time-varying average wind speed, and the harmonic synthesis method of updating time-varying average wind speed is used to simulate fluctuating wind speed. Then, based on the three-dimensional wind spectrum power density function, the time-varying power spectrum of the typhoon wind field is constructed, taking into account the spatial correlation of the wind field, and the modulation evolution power spectrum is obtained, which is compared with the simulated typhoon power spectrum; Finally, taking an overhead transmission line as an example, the rationality of the typhoon simulation method was verified. The research results indicate that as the basic time interval increases, the proportion of non-stationary factors in typhoons increases; The non-stationary typhoon simulation method proposed in this article can achieve the simulation of non-stationary typhoon wind fields on transmission lines.