基于暂态接地电阻建模的输电线路雷击响应研究  

Lightning Strike Response of Transmission Lines Based on Transient Earth Resistance Modelling

作　　者：郭蕾[1] 刘聪[1] 陈伟 魏仁伟 张栋 王东阳[1] 陈斯翔 周利军[1] 黄林 GUO Lei;LIU Cong;CHEN Wei;WEI Renwei;ZHANG Dong;WANG Dongyang;CHEN Sixiang;ZHOU Lijun;HUANG Lin(School of Electrical Engineering,Southwest Jiaotong University,Chengdu 611756,Sichuan Province,China;Foshan Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Foshan 528011,Guangdong Province,China)

机构地区：[1]西南交通大学电气工程学院,四川省成都市611756 [2]广东电网有限责任公司佛山供电局,广东省佛山市528011

出　　处：《电网技术》2023年第7期3001-3009,共9页Power System Technology

基　　金：四川省科技计划项目(青年科技创新研究团队项目2020JDTD009)。

摘　　要：通过仿真建模是研究输电线路雷击响应的重要方法,该文提出一种暂态接地电阻建模方法,进而研究输电线路雷击响应。首先基于土壤物性测试平台,测量典型土壤临界击穿场强;建立考虑土壤电离非线性过程的接地装置有限元计算模型,获取冲击下接地装置U-I曲线,基于粒子群算法识别出暂态接地电阻公式,在ATP-EMTP软件中利用MODEL模块编程实现暂态接地电阻模型,并结合多波阻抗模型建立输电系统整体仿真。以110k V输电线路冲击试验为建模案例,进行建模方法的验证与分析;最后,基于该模型研究了不同接地装置和土壤临界击穿场强下的输电线路雷击响应特性。结果表明:1)基于暂态接地电阻模型的输电线路雷击响应计算最大误差为3.7%,仿真精度较工频接地电阻和冲击接地电阻模型均有明显提升;2)相同占地面积的不同接地装置类型对杆塔塔顶及塔脚雷击电压峰值和塔顶波前有明显影响,而土壤临界击穿场强对塔顶电压峰值和波前时间影响较小而对塔脚电压峰值影响明显。Modelling through simulation is considered an important method to study the lightning strike response of transmission lines.In this paper,a transient grounding resistance modelling method is proposed,and the lightning strike response of the transmission lines is studied.Firstly,based on the soil physical test platform,the critical breakdown field strength of the typical soil is measured.By establishing a finite element calculation model of the earthing device considering the non-linear process of soil ionisation,the U-I curve of the earthing device under shock is obtained.The transient earthing resistance formula is identified based on the particle swarm algorithm,and the transient earthing resistance model is programmed in the ATP-EMTP using the MODEL module,and combined with multi-wave impedance model to establish the overall simulation of the transmission system.The modeling method is validated and analyzed by using the 110 kV transmission line impact test as a modeling case.Finally,based on the transient grounding resistance model,the lightning strike response characteristics of the transmission lines under different grounding devices and soil critical breakdown field strengths are studied.The results show that:1)the maximum error of the transmission line lightning response calculation based on the transient grounding resistance model is 3.7%,and the simulation accuracy is significantly improved compared with both the frequency grounding resistance and the impact grounding resistance models;2)different grounding device types with the same footprint have a significant impact on the peak voltage and the wave front at the top and the foot of the tower,while the soil critical breakdown field strength has a smaller impact on the peak voltage and the wave front time at the top of the tower The impact of soil critical breakdown field strength on the peak voltage and wave front time at the top of the tower is smaller,while the impact on the peak voltage at the foot of the tower is obvious.

关 键 词：土壤电离 雷击暂态响应 多波阻抗建模 输电线路 

分 类 号：TM721[电气工程—电力系统及自动化]