基于CNN-BiLSTM-Attention的特高压三端混合直流输电线路故障区域判别研究

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中图分类号：TM721 文献标志码：A 文章编号：1007-449X（2025）07-0132-10

Study on fault area discrimination of ultra-high voltage three-terminal hybrid DC transmission line based on CNN-BiLSTM-Attention

CHEN Shilong'， SONG Guoxiong'，DENG Jian²， BI Guihong'， YANG Yi1，LI Guohui1 （1.School of Electric Power Enginering，Kunming Universityof Science and Technology，Kunming 650500，China; 2.Three Gorges New EnergyOfshore Wind Power Operationand Maintenance Jiangsu Cable Company，Yancheng 2240o，China）

Abstract：A CNN-BiLSTM-Atention based fault area discrimination method was proposed to address the problems of difficult fault localization，low accuracy，and cumbersome threshold adjustment in the existing hybrid three-terminal DC transmisson system.Firstly，the fault area characteristics of the LCC side， T-zone and MMC2 side were analysed，and it was pointed out that the fault characteristics of diferent areas have their own uniqueness. Secondly，in order to make the model better understand and utilise the extracted fault features，the transient current and voltage data of four protection devices near the T-zone at the moment offault were collcted to obtain the power mutation data，the local features were extracted by convolutional neural networks（CNN），and the richer fault features were learnt byusing bi-directional long short term memory（BiLSTM）. Furthermore，the attention mechanism （AM） was used to weight the extractedfault feature information and filterthe fault features that are usefulfor fault detection to improve the model performance.Finaly，the simulation results show that the proposed method is able to perform fault detection quickly and accurately，and has a good ability to withstand excessive resistance and antiinterference while satisfying a high accuracy rate.

Keywords： three-terminal hybrid flexible DC； transient power；convolutional neural networks； bi-direc-tional long short term memory；attention mechanism； fault area identification

0引言

目前，多端混合直流输电系统充分结合了基于晶闸管型电网换相换流器（linecommutationconvert-er，LCC）和电压源型换流器（voltagesourceconvert-er，VSC）的高压直流输电系统各自的优点，弥补了各自的缺点[1-3]。（剩余15163字）