| 引用本文: | 覃渝文,吕思辰,吕飞鹏,朱玉勇,王少雄,廖建权.谱图小波变换在谐振接地系统故障选线中的应用[J].电力自动化设备,2025,45(6):208-216. |
| QIN Yuwen,Lü Sichen,Lü Feipeng,ZHU Yuyong,WANG Shaoxiong,LIAO Jianquan.Application of spectral graph wavelet transform in fault line selection of resonant grounding system[J].Electric Power Automation Equipment,2025,45(6):208-216. |
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| 摘要: |
| 谐振接地系统发生单相接地故障后，电流较弱且故障条件复杂多变，以单一故障特征量为判据的选线方法存在失效的风险。在分析了健全线路和故障线路在高、低频段的不同阻抗特性，同时揭示了路图图频率与傅里叶频率的关系后，利用改进谱图小波变换对各线路的零序电流信号进行不同频段的多尺度分解，根据故障线路与健全线路在特征频段上分解成分的幅值、极性差异，提出了一种通过正态分布概率密度函数融合2种故障指标的选线方法。仿真结果表明，所提方法在高阻接地、弧光接地等故障工况下依然能够准确选线，具有很强的可靠性。 |
| 关键词: 路图 图频率 谱图小波变换 正态分布 故障选线 故障分析 |
| DOI：10.16081/j.epae.202503014 |
| 分类号:TM713 |
| 基金项目:国家自然科学基金资助项目(52207126) |
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| Application of spectral graph wavelet transform in fault line selection of resonant grounding system |
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QIN Yuwen1, Lü Sichen2, Lü Feipeng1, ZHU Yuyong3, WANG Shaoxiong1, LIAO Jianquan1
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1.School of Electrical Engineering, Sichuan University, Chengdu 610065, China;2.Department of Computing Science, University of Alberta, Edmonton T6G 2S4, Canada;3.Luzhou Power Supply Company, State Grid Sichuan Electric Power Company, Luzhou 646000, China
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| Abstract: |
| After the single-phase grounding fault occurs in the resonant grounding system, the current is weak and the fault conditions are complex and changeable, and the line selection method based on the characteristic quantity of a single fault has the risk of failure. After analyzing the different impedance characteristics of the healthy line and the fault line in the high and low frequency bands, and revealing the relationship between the graph frequency of the road map and the Fourier frequency, the improved spectral wavelet transform is used to decompose the zero-sequence current signal of each line in different frequency bands. According to the difference in amplitude and polarity between the decomposition components of the fault line and the healthy line, a line selection method is proposed to fuse the two fault indexes through the normal distribution probability density function. The simulative results show that the proposed method can still accurately select the line under the fault conditions such as high-resistance grounding and arc grounding, and has strong reliability. |
| Key words: road map graph frequency spectral graph wavelet transform normal distribution fault line selection fault analysis |
