带散射体的电力系统多级传输线高频耦合模型

高频电磁场会与架空输电线路产生耦合，一旦高频电磁场的波长小于传输线的高度，经典传输线理论就不再适用。传统的全波数值算法虽然可以解决这一问题，但它的求解效率不高，需要消耗大量的时间与计算资源。此外，电力系统输电线路往往有多个垂直端，线路布局复杂。为了解决这些问题，本文提出了一种理论有效的方法来解决有损耗地面上方带有散射体的电力系统多级传输线的高频电磁场耦合问题。采用计算效率高的渐近法，并在渐近法中引入散射体的概念，以考虑更复杂的电路结构。最后用数值算例验证了该方法的准确性和有效性。

High frequency coupling model of multi-level transmission lines in power systems with scatterers

High frequency electromagnetic fields can couple with overhead transmission lines. Once the wavelength of the high-frequency electromagnetic field is smaller than the height of the transmission line, the classical transmission line theory is no longer applicable. Although traditional full wave numerical algorithms can solve this problem, their solving efficiency is not high and requires a lot of time and computational resources. In addition, power system transmission lines often have multiple vertical ends and complex line layouts. In order to solve these problems, this article proposes a theoretically effective method to solve the high-frequency electromagnetic field coupling problem of multi-level transmission lines in power systems with scatterers above lossy ground. Adopting an asymptotic meth-od with high computational efficiency, and introducing the concept of scatterers in the asymptotic method to consider more complex circuit structures. Finally, numerical examples were used to verify the accuracy and effectiveness of this method.