LIU Chenfei,ZOU Guibin,WEI Xiuyan.DC Collection Line Protection for Offshore Wind Power Based on Frequency-band Energy Ratio Restraint[J].Automation of Electric Power Systems,2026,50(19):213-223.
LIU Chenfei,ZOU Guibin,WEI Xiuyan.DC Collection Line Protection for Offshore Wind Power Based on Frequency-band Energy Ratio Restraint[J].Automation of Electric Power Systems,2026,50(19):213-223.DOI: 10.7500/AEPS20250320009.
DC Collection Line Protection for Offshore Wind Power Based on Frequency-band Energy Ratio Restraint
Offshore wind power DC collection systems with multiple collection lines and complex topologies face challenges in locating faults on DC collection lines. To address this issue
this paper proposes a single-ended protection method of DC collection lines for offshore wind power based on frequency-band energy ratio restraint. First
equivalent models for single-pole grounding faults and bipolar short-circuit faults are established to analyze the amplitude-frequency characteristics and energy distribution patterns of fault transient signals. Second
complementary ensemble empirical mode decomposition (CEEMD) is employed to perform time-frequency decomposition of fault transient signals. The ratio between dominant frequency energy and DC energy from the decomposed components is utilized to adaptively adjust the setting values of energy integral criterion
enabling faulty line selection. Additionally
the proposed protection method can serve as backup protection for DC busbar. PSCAD simulation results demonstrate that the proposed method achieves rapid and accurate faulty line identification with strong noise immunity and high tolerance to transition resistance.
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references
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Related Institution
Engineering Research Center of Offshore Wind Technology, Ministry of Education (Shanghai University of Electric Power)
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Engineering Research Center of Offshore Wind Technology Ministry of Education (Shanghai University of Electric Power)
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