一种电磁场-传输线组合的时域有限差分方法  

A Method of Finite Difference Time Domain Combined with Electromagnetic Field and Transmission Lines

作　　者：胡榕[1] 崔翔[1] 陈维江[2] 张卫东[1] 

机构地区：[1]华北电力大学新能源电力系统国家重点实验室,北京102206 [2]国家电网公司,北京100031

出　　处：《华北电力大学学报（自然科学版）》2015年第3期1-7,30,共8页Journal of North China Electric Power University：Natural Science Edition

基　　金：国家重点基础研究发展计划项目(973项目)(2011CB209405);国家电网公司科技项目(SGKJJSKF[2009]776;2011);中央高校基本科研业务费专项资金资助项目(12QX04)

摘　　要：气体绝缘开关设备(GIS)的传输结构主要由均匀传输线结构和三维非传输线结构组成,为了准确高效地计算GIS设备中开关操作产生的快速瞬态过电压(VFTO),提出了一种电磁场-传输线组合的时域有限差分方法 (3D-1D FDTD),即分别采用三维电磁场时域有限差分方法和均匀传输线时域有限差分方法对GIS设备的三维非传输线结构和均匀传输线结构进行建模和时域计算。讨论了衔接电磁场与传输线的耦合边界条件和计算迭代格式的稳定条件,并以一段GIS设备长直管母线为例,计算了不同位置的瞬态电压和瞬态电流,将计算结果与纯一维传输线等效电路模型的计算结果进行对比,验证了本文方法的有效性。Transmission structures of gas insulated switchgear （GIS） are mainly composed of uniform transmission line structures and three-dimensional non-transmission line structures. In order to accurately and efficiently calculate very fast transient overvohagc （VFTO） generated by switch operation in GIS, this paper presented a method of finite difference time domain combined with electromagnetic field and transmission lines （3D-1D FDTD）, that is, three-dimensional electromagnetic field computation with finite difference time domain method and uniform transmission line computation with finite difference time domain method were used respectively for the modeling and time-domain calculation of three-dimensional non-transmission line structures and uniform transmission line structures in GIS. In this paper, coupled boundary conditions connected with electromagnetic field and transmission lines, and stability conditions of itera- rive calculation were discussed, and taking a long straight busbar in GIS as an example, transient voltages and transient currents at different locations were calculated by 3D-1D FDTD, the calculation results of which were contrasted with those of one-dimensional transmission line equivalent circuit model to verify the effectiveness of 3D-1D FDTD.

关 键 词：气体绝缘开关设备 快速瞬态过电压 电磁场-传输线组合 时域有限差分 建模计算 

分 类 号：TM726[电气工程—电力系统及自动化]