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Research on Ground Fault Detection Technology of DC System Based on DT-CWT and SVD
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Nengjun LI1, Haicheng YANG1, Xianke XU1, Shushan LI2, Yuling GAO2
Electric Drive | 2024, 54(5) : 80 - 85
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Electric Drive | 2024, 54(5): 80-85
Research on Ground Fault Detection Technology of DC System Based on DT-CWT and SVD
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Nengjun LI1, Haicheng YANG1, Xianke XU1, Shushan LI2, Yuling GAO2
Affiliations
  • 1 State Grid Qinghai Electric Power Co.，Ltd. Xining Power Supply Company，Xining 810000，Qinghai，China
  • 2 Power China Qinghai Electric Power Engineering Co.，Ltd.，Xining 810000，Qinghai，China
Published: 2024-05-20 doi: 10.19457/j.1001-2095.dqcd24797
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The state of the DC system of substation is directly related to the normal operation of the substation. A new method for ground fault detection in substation DC systems，which is a combination of double-tree complex wavelet transform and singular value decomposition，was proposed to achieve fast and accurate location of ground faults occurring in substation DC systems. Firstly，the method constructed a Hankel matrix to decompose the branch current signal through a dual-tree complex wavelet transform（DT-CWT）. Secondly，the Hankel matrix was decomposed by the singular value decomposition（SVD）method with the aim of obtaining a series of singular eigenvalues. Thirdly，the singular value difference spectrum was constructed using the adjacent singular value differences，and the number of singular values was retained by the maximum peak of the singular value difference spectrum. Finally，the low-frequency signal was reconstructed by the retained singular values. The analysis results of the algorithm show that the method can accurately extract the low-frequency AC signal from the branch current signal and achieve the accurate location of the DC system ground fault in the substation，which can largely reduce the influence of the ground capacitance on the detection accuracy.

DC system  /  ground fault detection  /  double-tree complex wavelet transform（DT-CWT）  /  singular value decomposition（SVD）
Nengjun LI, Haicheng YANG, Xianke XU, Shushan LI, Yuling GAO. Research on Ground Fault Detection Technology of DC System Based on DT-CWT and SVD[J]. Electric Drive, 2024 , 54 (5) : 80 -85 . DOI: 10.19457/j.1001-2095.dqcd24797
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Article Info
doi: 10.19457/j.1001-2095.dqcd24797
  • Receive Date：2022-11-21
  • Online Date：2025-11-26
  • Published：2024-05-20
Article Data
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History
  • Received：2022-11-21
  • Revised：2023-01-11
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Affiliations
    1 State Grid Qinghai Electric Power Co.，Ltd. Xining Power Supply Company，Xining 810000，Qinghai，China
    2 Power China Qinghai Electric Power Engineering Co.，Ltd.，Xining 810000，Qinghai，China
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https://castjournals.cast.org.cn/joweb/dqcd/EN/10.19457/j.1001-2095.dqcd24797
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