考虑绝缘介质荷电影响的三维离子流场计算及特性分析  

Three-dimensional Ion Flow Field Calculation and Characteristic Analysis Considering the Influence of Dielectric Charge

作　　者：朱广闻 郝福钦 申南轩 卢铁兵 ZHU Guangwen;HAO Fuqin;SHEN Nanxuan;LU Tiebing(State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources North China Electric Power University,Changping District,Beijing 102206,China;State Grid Beijing Huairou Electric Power Company,Huairou District,Beijing 101400,China;State Grid Tianjin Electric Power Company,Hebei District,Tianjin 300143,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京市昌平区102206 [2]国网北京怀柔供电公司,北京市怀柔区101400 [3]国网天津市电力公司,天津市河北区300143

出　　处：《电网技术》2024年第11期4638-4647,I0055,共11页Power System Technology

基　　金：国家自然科学基金项目(52077074)。

摘　　要：当高压直流输电线路下存在绝缘介质时,导线电晕放电产生的自由电荷会积累到介质的表面,进而使周围的电场发生畸变,使得离子流场问题更加复杂。为了解决上述问题,该文基于上流有限元法提出了存在绝缘介质时的离子流场建模和计算方法。针对离子流场计算中存在多种介质时单元寻址复杂的问题,提出了有限元前处理中节点和单元的编号方法,有效解决了不同区域的识别寻址和电场求解困难的问题。然后,进行了存在绝缘介质时的线板电极离子流场实验,通过测量和计算结果的对比,验证了计算方法的有效性。最后,对存在绝缘介质时的直流导线离子流场分布特性进行了分析,发现:绝缘介质周围电场有所增大,电场增大的幅度与绝缘介质的荷电情况相关;介电常数越大,绝缘介质周围电场的变化程度越高。When there is an insulating medium under the HVDC transmission line,the free charge generated by corona discharge will accumulate on the surface of the medium and then distort the surrounding electric field,which makes the ion flow field more complicated.To solve the above problems,the modeling and calculation method of the ion flow field in the presence of an insulating medium is proposed based on the upstream finite element method.To solve the complex problem of unit addressing when there are multiple media in ion flow field calculation,the numbering method of nodes and units in finite element pre-processing is proposed,effectively solving the difficult problems of identifying and addressing different regions and solving electric fields.Then,the ion flow field experiment of the wire-plate electrode in the presence of an insulating medium is carried out,and the validity of the calculation method is verified by comparing the measured results with the calculated results.Finally,the ion flow field distribution characteristics of DC wire in the presence of an insulating medium are analyzed.It is found that the electric field around the insulating medium increases,and the amplitude of the electric field increase is related to the dielectric constant of the insulating medium.The greater the dielectric constant,the higher the electric field variation around the insulating medium.

关 键 词：高压直流输电 电晕放电 绝缘介质 离子流场 上流有限元法 

分 类 号：TM721[电气工程—电力系统及自动化]