摘要
输电线路地面标称电场强度的大小是输电线路设计需要考虑的重要参数。针对有限元法在计算中面临的网格剖分和计算时间较长问题,将基于径向基函数(RBF)的无网格法引入到直流输电线地面标称电场的计算中,阐述了RBF的定义和此法的原理、实施步骤,通过编制程序,进行仿真计算,并讨论了不同输电线参数对地面标称电场强度的影响。算例分析表明:运用此法计算的地面标称电场结果和已有文献值较为接近,并与具有解析解的电缆模型电场强度值吻合得很好,说明该方法具有较高的准确性和有效性;导线对地高度和极间距离对地面标称电场强度的影响较大,次导线半径和分裂根数对地面标称电场强度的影响较小。
Nominal electric field at ground level is one of the important factors for the design of transmission lines. FEM meets two big challenges in electromagnetic field computation. One comes from the mesh generation, which is a big difficulty especially in complex geometry. The other is the long time calculation. So the radial basis function method is introduced to calculate the nominal electric field at the ground level of UHVDC transmission lines. Not only the definition and ideas, but also the detailed implementation procedure of radial basis function method are presented. Computer programs are developed to simulate the model and the influences of conductor configuration on nominal electric field intensity are analyzed. Examples of calculation show that the results are accorded with those available literatures, and agreed satisfactorily with analytic solutions of the coaxial cable model. The height of the polar lines and conductor inter-spacing has a remarkable influence on ground nominal electric field intensity while the sub-conductorradius and number of sub-conductors have little intluence.
出处
《重庆大学学报(自然科学版)》
EI
CAS
CSCD
北大核心
2013年第1期75-80,共6页
Journal of Chongqing University
基金
国家自然科学基金资助项目(50907075)
重庆大学研究生科技创新基金项目(CDJXS11150019)
关键词
径向基函数
特高压直流
输电线路
标称电场
无网格法
radial basis function
UHVDC
transmission line
nominal electric field
meshless method