• 学术论文 •

### 云—地闪电地面水平电场在不同回击速度和地电参数时的波形特性

1. 1.现代电力系统仿真控制与绿色电能新技术教育部重点实验室（东北电力大学）, 吉林 吉林 132012
2.武汉大学电气与自动化学院, 湖北 武汉 430072
• 收稿日期:2020-03-20 修回日期:2021-01-13 出版日期:2021-08-25
• 作者简介:
• 于建立 男，1983年出生，博士，副教授，硕导.主要从事雷电电磁场计算、电力系统外部过电压及其防护等方面的研究工作.E-mail: yu_jianli@foxmail.com

### Waueform Characteristics of Ground Horizontal Electric Field of Cloud-to-Ground Lightning Under Different Return-Stroke Velocity and Geoelectric Parameters

YU Jian-li1,2, FAN Ya-dong2, ZHOU Mi2, CAI Li2

1. 1.Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology, Ministry of Education （Northeast Electric Power University）, Jilin, Jilin 132012, China
2.School of Electrical Engineering and Automation, Wuhan University, Wuhan, Hubei 430072, China
• Received:2020-03-20 Revised:2021-01-13 Online:2021-08-25 Published:2021-08-25

Abstract:

Aim to difference limitations such as low computational accuracy and weak computational performance for wide-area lightning electromagnetic pulse (LEMP), a new non-uniform grid finite difference time domain (FDTD) algorithm is proposed for large space distant conditions based on traditional uniform grid FDTD algorithm. The ground horizontal electric fields (Er) generated by cloud-to-ground lightning were calculated, and the distance between the observation point and the return-stroke channel (r) within 100km. This work revealed the typical waveform variation laws of Er generated by cloud-to-ground lightning changed along the return-stroke distance. Meanwhile, the effect of the earth conductivity (σ) and return-stroke velocity (v) on Er in this range was studied by using the non-uniform grid FDTD method. Results show that the waveforms of Er present in single pulse when r<2km. There emerged zero-crossing phenomenon when r<500m, and the farther distance the more obvious. The waveforms of Er present in bipolar pulse when r in the range of 50~100km. The pulse amplitude, half peak width, pulse width and the zero-crossing amplitude of Er attenuate with the increase of σ, especially in the range of σ≤2.5×10-3 S/m. The influence of v on Er increase significantly as return-stroke distance increases. The pulse amplitude of Er increase significantly with the increase of v when r >100m, and the effect of v on the zero-crossing amplitude of Er reflects the similar law when r >10km.