直流离子流场的有限元迭代计算  

Finite Element Iterative Computation of Direct Current Ionized Field

作　　者：余世峰[1] 阮江军[1] 张宇[2] 杜志叶[1] 黄道春[1] 

机构地区：[1]武汉大学电气工程学院,武汉430072 [2]江西省电力公司,南昌330077

出　　处：《高电压技术》2009年第4期894-899,共6页High Voltage Engineering

基　　金：国家电网公司重点科技项目(SGKJ[2007]106)~~

摘　　要：针对高压直流输电线下方地面处电场强度及离子流密度的问题,采用有限元迭代方法求解了双极离子流场控制方程。将正负极电流连续性方程合并,减少了计算的复杂度。利用圆筒电极问题,将该文计算结果与解析解进行对比,验证了算法的有效性。将方法应用于200kV直流输电线路模型的计算,并与文献测量结果进行对比,计算结果与实测结果较符合,认为误差主要与测量环境有关。利用该文方法计算了实际±500kV直流输电线路离子流场问题,并分析了导线对地高度、极间距变化时地面电场强度和离子流密度的变化情况,结果显示,随导线高度升高和极间距减小,地面处最大电场强度和离子流密度随之减小。As to the problem of electric field on the ground and ion density under high voltage direct current （HVDC） transmission lines, iterative finite element method is adopted to solve bipolar ionized field control equations. The computing complexity is reduced by combining the positive and negative polarity current continuity equations. The validity of the algorithm is verified by comparing the calculated results and analytical results in the process of solving cylindrical electrodes problem. This method has been applied to 200 kV DC transmission line model, the calculated results coincide well with the measured results in literatures, and measurement error is mainly related to the measuring environment. The method is applied to solve ionized field problem under ±500 kV DC transmission line, and how the electric field strength intensity and ion current density change with the conductor height and distance between poles is analyzed. The results show that both the electric field intensity on the surface of ground and ion density decrease when the wire height to ground is raised and the distance between poles is reduced.

关 键 词：高压直流 电场强度 离子流密度 有限元法 迭代计算 导线高度 极间距 

分 类 号：TM726[电气工程—电力系统及自动化]