基于长短时记忆神经网络的励磁涌流与故障电流识别方法

doi:10.16183/j.cnki.jsjtu.2022.352

摘要/Abstract

摘要：

变压器空载合闸时产生励磁涌流导致差动保护误动作的问题至今仍未能被完全解决.针对该问题,提出一种利用长短时记忆(LSTM)神经网络识别励磁涌流与故障电流的方法.首先,在PSCAD软件平台上搭建变压器空载合闸及内部故障仿真模型,通过仿真产生大量三相电流瞬时采样数据作为训练神经网络的样本集;然后,利用Keras平台搭建LSTM神经网络模型并完成训练;最后,利用新的仿真数据和现场故障录波数据对训练好的LSTM神经网络进行测试.结果表明LSTM神经网络可以快速准确地区分各种情况下的励磁涌流和故障电流,从而证实该方法的有效性.

关键词: 变压器差动保护, 长短时记忆神经网络, 励磁涌流识别, 故障电流识别

Abstract:

The problem of differential protection maloperation caused by inrush current during no-load closing of transformer has not been completely solved so far. To solve this problem, a method using long short-term memory (LSTM) neural network to identify inrush current and fault current is proposed. First, the simulation model of no-load closing and internal fault of transformer is built on the PSCAD software platform, and a large amount of three-phase current instantaneous sampling data is generated through simulation as the sample set to train the neural network. Then, the LSTM neural network model is built and trained by using the Keras platform. Finally, the new simulation data and fault recorder data is used to test the trained LSTM neural network. The results show that the LSTM neural network can quickly and accurately distinguish the inrush current and fault current under various conditions, which proves the effectiveness of the proposed method.

Key words: transformer differential protection, long short-term memory (LSTM) neural network, inrush current identification, fault current identification

中图分类号:

TM406
TP305

张国栋, 刘凯, 蒲海涛, 姚福强, 张帅帅. 基于长短时记忆神经网络的励磁涌流与故障电流识别方法[J]. 上海交通大学学报, 2024, 58(5): 730-738.

ZHANG Guodong, LIU Kai, PU Haitao, YAO Fuqiang, ZHANG Shuaishuai. Identification of Inrush Current and Fault Current Based on Long Short-Term Memory Neural Network[J]. Journal of Shanghai Jiao Tong University, 2024, 58(5): 730-738.

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层	输出数据形状	参数/个
LSTM1	20×10	560
LSTM2	10	840
隐藏层1	10	100
隐藏层2	10	100
输出层	1	10

厂站名	采样频率/kHz	总点数	步长	样本数	正确率/%	备注
YH	3.2	1800	20	90	100	无
SC	3.2	1600	20	80	100	空充1
SC	3.2	1600	20	80	100	空充2
SC	3.2	1600	20	80	100	空充3
WJ	2.4	1080	20	54	100	无
CJ	5.0	400	20	20	100	保护误动