Study on lightning risk assessment and early warning for UHV DC transmission channel  

作　　者：Shanqiang Gu Jian Wang Min Wu Juntian Guo Chun Zhao Jian Li 

机构地区：[1]Wuhan NARI Limited Liability Company,State Grid Electric Power Research Institute,Wuhan 430074,People's Republic of China [2]Department of Equipment Management,State Grid Corporation of China,Beijing 100031,People's Republic of China

出　　处：《High Voltage》2019年第2期144-150,共7页高电压（英文）

基　　金：National Key Technology R&D Program of China(2016YFB1200403-C-06);the National Natural Science Foundation of China(51777037);Science and Technology Project of SGCC(500331399,500484811).

摘　　要：Operation data show lightning faults account for>70%for the main ultra-high voltage(UHV)DC transmission channels,very different from the design view.In order to accurately master the lightning characteristics and the lightning protection performance of the line so as to propose solutions to weak points,this study firstly obtains and analyses the density and strength distributions of lightning risk source.Then the study proposes a set of risk assessment process where the key model electrogeometric model is improved according to the polarity effect of DC line.Then the work realises the calculation of the lightning shielding failure risk of single tower and whole line.The example shows the assessment result is consistent to the line's actual operation.Next,to further evaluate and predict the lightning risk in real time,the study adopts the backpropagation neural network algorithm to integrate the lightning detection data,atmospheric electric fields,and radar echoes to develop the early warning model of lightning risk source,and proposed a method to realise the early warning of lightning damage risk for UHV DC channels.The results show that the effective warning ratio is 73%and the failure-to-warn ratio is 27%which indicates very good application effects.

关 键 词：LIGHTNING CHANNEL NETWORK 

分 类 号：TM863[电气工程—高电压与绝缘技术]