电子学报 ›› 2021, Vol. 49 ›› Issue (8): 1633-1640.DOI: 10.12263/DZXB.20200277

• 学术论文 • 上一篇    下一篇

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

于建立1,2, 樊亚东2, 周蜜2, 蔡力2   

  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 发布日期: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

Jian-li YU1,2, Ya-dong FAN2, Mi ZHOU2, Li CAI2   

  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

摘要:

针对地闪电磁脉冲计算在广域和高精度方面存在的难题,采用非均匀网格划分技术对均匀网格时域有限差分法进行改进,所提出的非均匀网格时域有限差分法适合广域地闪电磁脉冲计算.计算了100 km以内的地闪地面水平电场(Er),揭示了Er随回击距离变化所体现的波形变化规律.同时分析了大地电导率(σ)和回击速度(v)对该距离内Er的影响.结果表明:Er在2km内呈单极性脉冲,500m内在首次脉冲后出现过零现象且距离越远该现象越明显,50~100km内呈双极性连续脉冲;Er的脉冲幅值、半峰值宽度、脉冲宽度、过零幅度均随σ增大而减小,σ≤2.5×10-3 S/m时尤为明显;vEr的影响随距离增大明显增强,100m以外的脉冲幅值和10km以外的过零幅度随v增大有明显提高.

关键词: 雷电电磁脉冲, 地闪, 非均匀网格时域有限差分, 地面水平电场, 大地电导率, 回击速度

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.

Key words: LEMP(Lightning Electromagnetic Pulse), cloud-to-ground lightning, non-uniform grid FDTD(Finite Difference Time Domain), ground horizontal electric field, earth conductivity, return-stroke velocity

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