考虑风速和导线高度影响的高压直流输电线下离子流场计算  

Calculation of Ionized Field under HVDC Transmission Lines Considering the Influence of Wind Speed and Wire Height

作　　者：许松枝 汪沨[1] 李敏[1] 邓晓[1,2] 谢望君 陈晓林[1] XU Songzhi WANG Feng LI Min DENG Xiao XIE Wangjun CHEN Xiaolin(College of Electrical and Information Engineering, Hunan University, Changsha 410082, China Laboratory for Electromagnetic Environment Monitoring and Modeling of Near Earth Space （Changsha University of Science and Technology）, Changsha 410114, China)

机构地区：[1]湖南大学电气与信息工程学院,长沙410082 [2]近地空间电磁环境监测与建模实验室(长沙理工大学),长沙410114

出　　处：《电力系统及其自动化学报》2016年第12期57-63,共7页Proceedings of the CSU-EPSA

基　　金：教育部新世纪优秀人才支持计划资助项目(NCET-11-0130);长沙理工大学近地空间电磁环境监测与建模湖南省普通高校重点实验室开放基金资助项目(20150101)

摘　　要：为了预测高压直流输电线下的电磁环境,对不同条件下的地面离子流场分布进行了计算研究。采用Kaptzov假设,通过模拟电荷法计算人工边界处的标称电位,再结合泊松方程计算出空间电荷产生的电场,同时提出一种新的空间电荷密度更新公式,基于上流有限元方法求解离子电流密度方程。通过同轴圆柱电极电场问题验证了该算法的有效性,并利用考虑风速的单极高压直流输电线路模型说明了该算法的可靠性。最后,将其应用到不同导线对地高度和不同风速影响下的双极高压直流导线离子流场问题,结果表明导线对地高度和风速都会影响地面最大合成场强和离子流密度,且风速会使其发生偏移。In order to predict the electromagnetic environment under high voltage direct current （HVDC） transmission lines, the distribution of ionized field under different conditions is calculated. With Kaptzov hypothesis, the potential near artificial boundary is calculated by charge simulation method, and the electric field generated by space charge is obtained using Poisson equation. Moreover, a new updating formula of space charge density is proposed, and the equa- tion of ion current density is solved by upstream finite element method. The validity of the proposed algorithm is verified by calculating the coaxial cylindrical electrode electric field, and its reliability is verified by solving the model of mono- polar HVDC transmission lines considering wind speed. Finally, the ionized field of bipolar HVDC transmission lines under the influence of different heights and wind speeds is calculated, showing that both height and wind have a great influence on the maximum ground level profiles of field and ion current density, which are prone to shift due to wind.

关 键 词：高压直流 离子流场 导线高度 风速 上流有限元法 

分 类 号：TM723[电气工程—电力系统及自动化]