HVDC输电线路合成场强解析计算方法研究

Research on Analytic Calculation of Total Electric Field around HVDC Transmission Lines

为研究和确定高压直流输电线路的电磁环境影响及电晕损耗,分析了高压直流线路周围的合成场强,根据Deutseh假设,认为空间电荷不影响场强的方向,只影响其大小,从而把合成场强的二维计算变为以电位为变量的函数一维计算。利用欧拉法求解描述电力线的微分方程,并对微分方程边界条件做了修改,使得电力线更为完整。给出了解析方法的地面合成场强计算的详细步骤,研究了次导线半径、次导线分裂间距,正、负极导线间距和导线高度对地面合成场强大小及分布的影响。通过与实验模型的测试结果对比,验证了算法在工程上的有效性和实用性。

In order to research and define electric-magnetic environment effect and corona loss on HVDC transmission line, the total electric field around HVDC transmission line is discussed. Based on Deutseh＇ s assumption, it is considered that space charge influence not the direction of electric field, but magnitude. Thus, two-dimension calculation about the total electric field is changed to one-dimension calculation about function, which uses electric potential as variable. Using Euler＇s method to solute differential equation about description power-line, and modify the boundary conditions to make power-line complete. The paper introduces analytic method about the detailed procedure of calculation the total electric field above ground, and researches its effect on radius, split spacing of sub-conductor, positive and negative spacing of conductor, altitude of conductor.