Evaluating transient behaviour of large-scale photovoltaic systems during lightning events using enhanced finite difference time domain method with variable cell size approach  

作　　者：Ibrahim Hetita Diaa-Eldin A.Mansour Yang Han Ping Yang Congling Wang Mohamed M.F.Darwish Matti Lehtonen Amr S.Zalhaf 

机构地区：[1]School of Mechanical and Electrical Engineering,University of Electronic Science and Technology of China(UESTC),Chengdu,China [2]Electrical Power and Machines Engineering Department,Faculty of Engineering,Helwan University,Cairo,Egypt [3]Electrical Power and Machines Engineering Department,Faculty of Engineering,Tanta University,Tanta,Egypt [4]Department of Electrical Power Engineering,Faculty of Engineering,Egypt-Japan University of Science and Technology,Alexandria,Egypt [5]Department of Electrical Engineering,Faculty of Engineering at Shoubra,Benha University,Cairo,Egypt [6]Department of Electrical Engineering and Automation,School of Electrical Engineering,Aalto University,Espoo,Finland

出　　处：《High Voltage》2024年第3期636-647,共12页高电压（英文）

基　　金：Natural Science Foundation,Grant/Award Number:51977026;Science and Technology Program of Sichuan Province,Grant/Award Number:2021YFG0255;Sichuan Provincial Postdoctoral Science Foundation,Grant/Award Number:246861。

摘　　要：Photovoltaic(PV)arrays are usually installed in open areas;hence,they are vulnerable to lightning strikes that can result in cell degradation,complete damage,service disruption,and increased maintenance costs.As a result,it is imperative to develop an effective and efficient lightning protection system by evaluating the transient behaviour of PV arrays during lightning events.The aim is to evaluate the transient analysis of large-scale PV systems when subjected to lightning strikes using the finite difference time domain(FDTD)technique.Transient overvoltages are calculated at various points within the mounting system.To optimise the FDTD method's execution time and make it more suitable for less powerful hardware,a variable cell size approach is employed.Specifically,larger cell dimensions are used in the earthing system and smaller cell dimensions are used in the mounting system.The FDTD method is utilised to calculate the temporal variation of transient overvoltages for large-scale PV systems under different scenarios,including variations in the striking point,soil resistivity,and the presence of a metal frame.Simulation results indicate that the highest transient overvoltages occur at the striking point,and these values increase with the presence of a PV metal frame as well as with higher soil resistivity.Furthermore,a comparison is performed between the overvoltage results obtained from the FDTD approach and the partial element equivalent circuit(PEEC)method at the four corner points of the mounting systems to demonstrate the superior accuracy of the FDTD method.Besides,a laboratory experiment is conducted on a small-scale PV system to validate the simulation results.The calculated overvoltages obtained from the FDTD and PEEC methods are compared with the measured values,yielding a mean absolute error of 5%and 11%for the FDTD and PEEC methods,respectively,thereby confirming the accuracy of the FDTD simulation model.

关 键 词：TRANSIENT behaviour FINITE 

分 类 号：TM86[电气工程—高电压与绝缘技术]