特高压直流输电圆环型接地极电流场计算  

Current Field Calculation of Cirque UHVDC Transmission Grounding Electrode

作　　者：徐韬[1] 徐政[1] 张哲任[1] 周志超[2] 沈扬[2] 

机构地区：[1]浙江大学电气工程学院,杭州310027 [2]浙江省电力设计院,杭州310027

出　　处：《高电压技术》2012年第6期1445-1450,共6页High Voltage Engineering

基　　金：国家高技术研究发展计划(863计划)(2012AA050205)~~

摘　　要：在特高压直流(UHVDC)输电接地极设计过程中,需要对接地极附近的电流场进行计算。为此,介绍了基于电阻网络模型的高压直流输电圆环型接地极电流场的计算方法。首先将接地极场域在三维空间内分割为若干单元,每个单元等效为系统中的1个节点,通过6个等值电阻与相邻单元节点连接;然后将所有单元节点相互连接,构成1个电阻网络,从而将电流场计算问题转化为对电阻网络的求解问题;最后求解电阻网络,得到节点电压,并根据节点电压计算跨步电压、溢流密度等电流场相关参数。在同等条件下,将该算法与ANSYS仿真得到的电流场计算结果进行对比,结果偏差较小,验证了该算法的正确性。In the process of designing an UHVDC transmission grounding electrode, the current field should be calculated. As a result, we introduced a current field calculating method for cirque UHVDC transmission grounding electrode based on resistance network model. Firstly, the grounding electrode field was divided into a certain number of cells in 3D space, and each cell was equivalent to a node in the system, with 6 resistances connecting to adjacent cells; Then, by connecting all the nodes, a resistance network was formed, thus the current field could be calculated by solving the network; Finally, node voltage of the network was acquired and relevant parameters of current field was presented on the basis of node voltage, such as step voltage, current density, etc. Under the same conditions, the calculated results of current field were compared with those by the ANSYS simulation, showing a good consistency, thus, the validity of the resistance network method was verified.

关 键 词：特高压直流输电 接地极 电流场 土壤电阻率 电阻网络 跨步电压 

分 类 号：TM862[电气工程—高电压与绝缘技术]