雾霾对高压直流输电线路电晕离子流场的影响  

Influence of Fog-haze on Corona Ion Flow Field of HVDC Transmission Lines

作　　者：谭震宇[1,2] 杨金洪[1,2] 徐明铭[3] 王晶[1,2] 李清泉[1,2] 

机构地区：[1]山东大学电气工程学院,济南250061 [2]山东省特高压输变电技术与装备重点实验室,济南250061 [3]鲁东大学信息与电气工程学院,烟台264025

出　　处：《高电压技术》2016年第12期3844-3852,共9页High Voltage Engineering

基　　金：山东省科技发展计划项目(2014GGX104006)~~

摘　　要：为探究雾霾对高压直流(HVDC)输电线路电晕离子流场的影响规律,提出了雾霾对HVDC输电线路电晕离子流场影响的计算方法。考虑雾霾微粒的荷电特性和湿度对电晕起晕的作用,采用有限元方法计算了±800 k V线路在各种雾霾污染等级下的合成电场强度和离子流密度。计算结果表明:随着雾霾污染程度增加,地面合成电场强度和离子流密度相对于正常天气时的值有所增大,在较大污染程度下,其最大值的增长率随污染浓度增大呈近似线性关系;高湿度雾霾状况下的电晕离子流场随污染程度变化比低湿度雾霾和干霾下更加明显。分析认为:雾霾条件下湿度对电晕起始电场强度的影响及空间悬浮颗粒的荷电行为是地面合成电场和离子流密度变化的主要原因,离子迁移率的减小抑制了地面离子流密度的增大。研究思路对考虑雾霾因素时HVDC输电线路规划设计中电晕效应的分析具有参考价值。To study the effect of fog-haze on the ionized field of high voltage direct current （HVDC） transmission lines, we proposed a computation method for the effects of fog-haze on the ionized field of HVDC transmission lines. Taking both the charging effects of haze particles and the influence of humidity on corona inception into account, we computed the field strengths and ion current densities in the vicinity of the ±800 kV ultra HVDC transmission lines under different haze pollution degrees using a finite element method. The results show that, in comparison to the values in fine condition, the total field strengths and ion current densities near ground increase with the pollution degree of hazy weather, and the growth rates of the respective maximum values for them are in a behavior of linearly increasing with respect to the pollu- tion level at high pollution concentrations. Furthermore, the change of the ionized field with the pollution degree of hazy weather is more obvious for high humidity than that for the low one or for dry haze situation. The study suggests that the effect of humidity on corona inception and the charging of haze particles are the main reasons for the change of electrical field strengths and the ion flow densities near ground, and the decrease in ion mobility restricts the growth of ion flow densities under hazy weather. The study provides a method for analyzing the corona effect on HVDC transmission lines.

关 键 词：高压直流输电线路 雾霾 电磁环境 电晕 离子流场 有限元法 

分 类 号：TM75[电气工程—电力系统及自动化]