雷云电场作用下±1100kV特高压直流输电线路电晕空间电荷分布特征的仿真研究  

Distribution Characteristics of Corona Space Charge Generated from the ±1 100 kV UHVDC Overhead Transmission Line Under the Thundercloud Electric Field

作　　者：陈杉杉 贺恒鑫 邹妍晖 余军 陈维江 何俊佳 CHEN Shanshan;HE Hengxin;ZOU Yanhui;YU Jun;CHEN Weijiang;HE Junjia(State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China;State Grid Corporation of China, Beijing 100031, China)

机构地区：[1]华中科技大学电气与电子工程学院强电磁工程与新技术国家重点实验室,武汉430074 [2]国家电网有限公司,北京100031

出　　处：《高电压技术》2018年第4期1367-1376,共10页High Voltage Engineering

基　　金：国家重点研发计划(2016YFB0900801);国家自然科学基金(51607076)~~

摘　　要：为了研究电晕空间电荷对特高压直流输电线路雷电绕击特性的影响机制,基于带通量限制器的二阶有限体积方法,建立了雷云电场下特高压直流输电线路电晕空间电荷分布的数值仿真模型,通过与实验对比,验证了模型的合理性。计算获得典型±1 100 kV特高压直流输电线路电晕起始过程、电晕电流波形和空间电荷分布特征,得出正空间电荷边界在垂直地面方向的平均运动速度为4.05 m/s。考虑到电晕空间电荷引起的电位畸变对雷电上行先导存在屏蔽作用,通过分析不同时刻电位畸变量分布,得出雷云电场下电位畸变集中分布于地线上方,相较于仅存在直流工作电压情况,电位畸变量最大值增加了约20倍。由此推断,受电晕空间电荷影响平原地区±1 100kV线路地线产生的上行先导更易沿水平方向发展。该工作为后续研究电晕空间电荷对特高压直流线路雷电绕击特性的影响奠定了基础。In order to study the effect of corona space charge on the lightning shielding failure process,we established a 2D numerical simulation model to calculate the distribution of the corona space charge under the thundercloud electric field based on a second-order accurate finite volume method with flux limiter.The validity of the model was comparatively experimentally verified.Using the model,we presented the corona inception process,corona current waveform,and corona space charge distribution characteristics of a typical ±1 100 kV UHVDC transmission line and calculated the average velocity of the positive space charge boundary in the y-axis direction to be 4.05 m/s.By analyzing the distribution of the space potential distortion at different times,it was concluded that the potential distortion under the thundercloud electric field mainly concentrated above the grounded wires.Compared with the effect of only the DC operating voltage,the maximum value of the space potential distortion was increased by about 20 times.From the calculated potential distortion distribution,it could be seen that the upward leader from the grounded wire of the ±1 100 kV UHVDC transmission line in the plain area was more likely to develop along the horizontal direction.The work lays a foundation for the further study on the influence of the space charge layer on the lightning attachment to UHVDC overhead transmission lines.

关 键 词：电晕空间电荷 特高压直流输电线路 绕击 二阶有限体积 空间电位畸变 

分 类 号：TM75[电气工程—电力系统及自动化]