高精度上流有限元法在特高压直流输电线路离子流场计算中的应用

发布时间：2018-01-14 09:28

本文关键词：高精度上流有限元法在特高压直流输电线路离子流场计算中的应用　出处：《高电压技术》2016年04期 　论文类型：期刊论文

【摘要】：在对高压直流(HVDC)输电线路下的电磁环境进行预测时,地面合成场强和离子流密度的计算问题实际上是一个多维非线性问题。在对剖分单元进行处理时,为了解决传统的有限元方法、上流有限元法采取线性假设与线性插值,存在计算量大、精度差、算法效率低的问题,提出一种新的非线性空间电荷密度插值方法,从理论上推导了算法的实现过程,并基于上流有限元方法对离子电流密度方程进行迭代求解。采用该算法对现场运行的±500 k V和±800 k V输电线路离子流场进行了理论计算与现场实地测量,并将理论计算结果与实际测量结果进行了对比,结果表明:所提出的算法能在减少计算量的同时提高计算的准确度。针对风速对双极离子流场影响的研究较少的情况,研究讨论了不同风速影响下的双极离子流场问题,得到了风速对双极离子流场地面最大合成场强和离子流密度影响的规律,为新的直流输电线路的设计提供了有力的参考。
[Abstract]:The electromagnetic environment of HVDC transmission line is predicted. In order to solve the traditional finite element method (FEM), the calculation of the ground synthetic field strength and ion current density is actually a multi-dimensional nonlinear problem. The upper class finite element method adopts linear assumption and linear interpolation, which has the problems of large computation, low precision and low efficiency. A new nonlinear space charge density interpolation method is proposed. The realization process of the algorithm is deduced theoretically. The ion current density equation is solved iteratively based on the upper current finite element method. The ion flow field of V transmission line is calculated theoretically and measured in situ. The theoretical calculation results are compared with the actual measurement results. The results show that the proposed algorithm can reduce the amount of calculation and improve the accuracy of calculation. In this paper, the problem of bipolar ion flow under different wind speeds is discussed, and the influence of wind speed on the maximum synthetic field intensity and ion current density on the surface of bipolar ion flow field is obtained. It provides a powerful reference for the design of new HVDC transmission lines.
【作者单位】：湖南大学电气与信息工程学院;国家电网公司湖南省电力科学研究院;
【基金】：国家自然科学基金(61102039) 国家重点基础研究发展计划项目(973计划)(2012CB215106) 教育部新世纪优秀人才支持计划(NCET-11-0130) 高校博士学科点专项科研基金(20120161110009) 湖南省自然科学基金(14JJ7029)~~
【分类号】：TM744;TM721.1
【正文快照】： Application of the High Precision Upstream FEM to Calculation of the Ionized Fieldof HVDC Transmission LineWANG Feng1,FAN Jingmin1,LI Min1,LIANG Yidan1,PENG Jiwen2,LüJianhong2(1.School of Electrical and Information Engineering,Hunan University,Changsha

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