Research on Line Selection Method Based on Active Injection Under DC Feeder Single-Pole Grounding Fault

Xinghua Huang, Yuanliang Fan, Wenqi Li, Jiayang Fei () and Jianhua Wang
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Xinghua Huang: State Grid Fujian Electric Power Research Institute, Fuzhou 350007, China
Yuanliang Fan: State Grid Fujian Electric Power Research Institute, Fuzhou 350007, China
Wenqi Li: State Grid Fujian Electric Power Research Institute, Fuzhou 350007, China
Jiayang Fei: School of Electrical Engineering, Southeast University, Nanjing 210096, China
Jianhua Wang: School of Electrical Engineering, Southeast University, Nanjing 210096, China

Energies, 2025, vol. 18, issue 18, 1-15

Abstract: Due to the “low damping” characteristics of the DC distribution system, the traditional passive scheme is not suitable for DC fault detection and positioning. Therefore, this paper proposes an active injection fault identification method suitable for DC feeder line under single-pole grounding faults. Based on the high controllability of converters, this method uses the oscillation circuit characteristics of the DC side single-pole grounding fault to superimpose the harmonics of fixed frequency into the converter modulated wave, and derives the selection principles of harmonic amplitude and frequency. After the fault, the positive and negative current signals are extracted from the feeder lines, and the zero-mode current components are extracted by the Karrenbauer transformation and band-pass filter, the current phases are compared to achieve the fault feeder line selection. According to simulation verification, the power quality of the actively injected harmonics is within the standard range under the condition of global injection, and the single-pole grounding faults in each feeder line can be identified.

Keywords: harmonic injection; grounding fault; fault line selection; protection design (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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