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基于STFT与改进ConvNeXt配电网故障区段定位方法研究

来源:电工电气发布时间:2024-08-01 15:01浏览次数:149

基于STFT与改进ConvNeXt配电网故障区段定位方法研究

邓思敬1,2,吴浩1,2,邓力川1,2,蔡源1,2
(1 四川轻化工大学 自动化与信息工程学院,四川 宜宾 644000;
2 人工智能四川省重点实验室,四川 宜宾 644000)
 
    摘 要:在目前的配电线路智能故障诊断研究方法中,存在着难以充分提取故障特征、抗噪声干扰能力弱、抗高阻能力差等问题。提出了一种基于短时傅里叶变换(STFT)并引入迁移学习的改进 ConvNeXt 配电网故障区段定位方法。该方法通过采集配电网各馈线两端的零序电流,计算出各馈线两端的零序电流幅值差,然后将各段的零序电流幅值差拼接成一个组合信号,用 STFT 处理组合信号,得到时频图,并将得到的时频图分为训练集和测试集。仿真结果表明,基于 STFT 并改进的 ConvNeXt 配电网故障区段定位方法在不同的故障距离、不同的接地电阻和不同的初始故障角度下都能有效地实现故障区段的选择,并且该方法具有较强的抗高阻能力以及较强的抗噪声干扰能力,在部分数据丢失的情况下仍能准确进行区段定位。
    关键词: 配电网;暂态零序电流;区段定位;短时傅里叶变换;ConvNeXt 模型
    中图分类号:TM711     文献标识码:A     文章编号:1007-3175(2024)07-0016-11
 
Research on Fault Segment Location Method of Distribution Network
Based on STFT and Improved ConvNeXt
 
DENG Si-jing1,2, WU Hao1,2, DENG Li-chuan1,2, CAI Yuan1,2
(1 School of Automation and Information Engineering, Sichuan University of Science & Engineering, Yibin 644000, China;
2 Artificial Intelligence Key Laboratory of Sichuan Province, Yibin 644000, China)
 
    Abstract: In the present research methods of intelligent fault diagnosis of distribution lines, there are some problems, such as difficulty to extract fault features fully, weak ability to resist noise interference and poor ability to resist high resistance. In this paper, an improved fault segment location method of ConvNeXt distribution network based on short-time fourier transform (STFT) and transfer learning is proposed.In this method, the amplitude difference of the zero-sequence current at both ends of each feeder is calculated by collecting the zero-sequence current at both ends of each feeder of the distribution network. Then, the amplitude difference of the zero-sequence current of each segment is spliced into a combined signal, and the combined signal is processed by STFT to obtain a time-frequency graph, and the obtained time-frequency graph is divided into a training set and a test set. The simulation results show that the improved ConvNeXt distribution network fault segment location method based on STFT can effectively realize the selection of fault segments under different fault distances, different ground resistances and different initial fault angles, and the method has strong anti-high impedance ability and strong anti-noise interference ability, and can still accurately locate the segment in the case of partial data loss.
    Key words: distribution network; transient zero-sequence current; segment location; short-time fourier transform; ConvNeXt model
 
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