Time domain characteristics of lossy multiconductor transmission lines randomly excited by electromagnetic pulse

Abstract

This paper provides a time domain method for solving the induced currents (and voltages) of frequency-dependent lossy multiconductor transmission lines (MTLs) model randomly excited by electromagnetic pulse (EMP) plane wave. The model is processed based on the generalized polynomial chaos expansion (gPCE) and improved finite difference time domain (FDTD). The improved FDTD method overcomes the shortcomings of the conventional method that oversimplifies the expression of conductor impedance. In addition, when quantifying the influence of uncertainty on induced values, general formula of the global sensitivity analysis is provided by defining the gPCE basis function sequence to solve the complicated search work. The verification shows that the improved FDTD method alone or combined with gPCE to solve the lossy MTLs model excited by EMP is superior to the conventional methods in solving time and accuracy. Finally, compared with the Monte Carlo method, the effectiveness of the sensitivity method is also verified.

KEYWORDS:

• Transmission lines
• strong electromagnetic pulse
• generalized polynomial chaos expansion
• uncertainty analysis
• global sensitivity analysis (GSA)
• finite-difference time-domain (FDTD)

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the National Key Research and Development Program of China [grant number 2018YFC0809500] and the Scholarship from the China Scholarship Council [grant number 202207000085].

Notes on contributors

Chengpan Yang

Chengpan Yang was born in Sichaun Province, China, in 1994. He received the master’s degree in electrical engineering from Nanjing Normal University, Nanjing, China, in 2020. He is currently working toward the Ph.D. degree in electrical engineering at Southwest Jiaotong University, Chengdu, China. His research interests are in the areas of electromagnetic compatibility, crosstalk and multiconductor transmission lines.

Feng Zhu

Feng Zhu received the Ph.D. degree in railway traction electrification and automation from the Southwest Jiaotong University, Sichuan, China, in 1997. He is currently a Full Professor with the School of Electrical Engineering, Southwest Jiaotong University. His current research interests include locomotive over-voltage and grounding technology, electromagnetic theory and numerical analysis of electromagnetic field and electromagnetic compatibility analysis and design.