电力系统架空多导体传输线的高频耦合电流计算模型  

High-frequency coupling current calculation model of overhead multi-conductor transmission lines in electric power system

作　　者：谢玮琛 郭俊[1] 郑群爽 谢彦召[1] XIE Weichen;GUO Jun;ZHENG Qunshuang;XIE Yanzhao(Xi′an Jiaotong University(State Key Laboratory of Electrical Insulation and Power Equipment),Xi′an 710049,China)

机构地区：[1]西安交通大学(电工材料电气绝缘全国重点实验室),陕西西安710049

出　　处：《电力工程技术》2024年第4期88-94,146,共8页Electric Power Engineering Technology

基　　金：国家自然科学基金资助项目(52207015)。

摘　　要：架空传输线作为电力系统中的重要组成部分,其在瞬态电磁场或激励源作用下(例如高空电磁脉冲)通常能够耦合出高幅值过电流,将作为强电磁干扰的耦合路径对电力系统造成严重干扰。现有建模方法中,经典传输线理论在处理非电小尺寸横截面线路的高频耦合问题时存在较大误差;全波数值算法(例如矩量法)依赖网格剖分计算过程使得其在处理长线情况时效率不高。此外,电力系统中往往线缆数量较多,且地面均须考虑实际有耗情况。为解决上述问题,文中提出一种能够计算电力系统架空传输线高频耦合电流的渐近模型。基于计算效率较高的渐近理论,引入反射与散射过程对高阶模式分量进行量化,并针对任意线路数量、任意参数地面及不同激励情况,推导统一电流表达式。最后,利用全波数值仿真以及天线辐照实验验证模型有效性和可靠性。结果表明,文中计算模型能够快速计算高频耦合电流,为线路防护以及电磁效应研究提供理论基础与数据支撑。Overhead transmission lines are the significant component of electric power system,where the over current can be coupled with the transient electromagnetic field or excitations(such as high-altitude electromagnetic pulse).As the coupling path of strong electro-magnetic interference,overhead transmission lines cause serious interference to the power system.Among the existing modelling methods,the classical transmission line theory may generate large error when dealing with the high-frequency coupling problem,where the cross dimension of the transmission line is not electrically small.Numerical full-wave method(such as moment of method)which relies on the grid subdivision with low efficiency when dealing with long transmission lines.Moreover,the number of cables is usually large in electric power system,and the ground are considered as the lossy ground.Therefore,to address the above mentioned problems,an asymptotic method is proposed to calculate the high-frequency coupling current along overhead transmission lines in electric power system.Based on the asymptotic theory with high calculation efficiency,the scattering and reflection process are introduced to quantify higher-order model components.In addition,the arbitrary number of wires,arbitrary parameters of the ground and different excitations are considered to derivate the current expression.Finally,the validity and reliability of the proposed method are tested using the full-wave simulation and antenna irradiation experiment.The proposed method can quickly calculate high-frequency coupling current,which can provide theoretical basis and data support for protection and electromagnetic effect study of overhead transmission lines.

关 键 词：架空传输线 有损耗地面 渐近法 高频耦合电流 全波数值算法 天线辐照实验 

分 类 号：TM75[电气工程—电力系统及自动化] TN811[电子电信—信息与通信工程]