改善同塔混压双回直流输电线路电磁环境研究

Research on Improving Electromagnetic Environment of Mixed-Voltage Double-Circuit DC Transmission Line on the Same Tower

为了改善高压直流输电线路日益严重的电磁影响,提出混压双回直流输电线路布置的新方案。新方案线路布置通过改变极导线空间几何架构,重构极导线电晕后正负离子的空间分布状态来减弱直流输电线路对环境的电磁影响,研究其电磁环境具有重要意义。本文基于Kaptzov假设,运用COMSOL多物理场耦合计算了新方案和常规布置下直流线路的离子流浓度、合成电场、走廊宽度以及合成电场在不同风速下的变化。结果表明,选择合适的新布置方案可有效改善电磁环境影响,节约输电走廊资源。此外,新方案布置下直流线路特有的低值域不对称电磁环境具有优异的抗风性与稳定性。

In order to improve the increasingly serious electromagnetic impact of high-voltage direct current transmission lines,a new scheme for the layout of hybrid double circuit direct current transmission lines is proposed.The new scheme of line layout weakens the electromagnetic impact of DC transmission lines on the environment by changing the spatial geometric structure of pole conductors and reconstructing the spatial distribution of positive and negative ions after corona discharge of pole conductors.Studying its electromagnetic environment is of great significance.This article is based on the Kaptzov hypothesis and uses COMSOL multi physics field coupling to calculate the ion current concentration,synthetic electric field,corridor width,and changes in synthetic electric field under different wind speeds for DC transmission lines under the new scheme and conventional layout.The results indicate that selecting a suitable new layout scheme can effectively improve the electromagnetic environment impact and save transmission corridor resources.In addition,the unique low range asymmetric electromagnetic environment of Dc lines under the new scheme layout has excellent wind resistance and stability.