A comprehensive identification method of single-phase grounding and disconnection faults based on feature fusion of branch currents and neutral point voltage

Le résumé fourni par la source

Aiming at the difficulty in distinguishing between single-phase grounding and disconnection faults in distribution networks, as well as the vulnerability of traditional identification methods to interference from distributed generators due to their reliance on phase voltage, this paper proposes a comprehensive identification method for single-phase fault based on feature fusion of branch currents and neutral point voltage. Firstly, the abrupt times of zero-sequence voltage, and abrupt features of negative sequence current amplitude and fault phase current of four typical single-phase faults, namely single-phase grounding, disconnection without grounding, disconnection with load-side grounding and disconnection with power-side grounding are analyzed. Secondly, by applying a multi-electrical quantity fusion criterion, different fault types are effectively distinguished. Thirdly, the fault section is located by analyzing the similarity of zero-sequence current waveforms and the abrupt changes in negative sequence current. Finally, a 10kV distribution network model is built in MATLAB/Simulink for simulation verification. The results show that the method has good applicability in systems with ungrounded neutral points and can adapt to complex conditions such as grid-forming distributed generator access, noise interference, abrupt and attenuation of grounding resistance. The proposed method overcomes the limitations of traditional methods that rely on phase voltage and are vulnerable to interference from new energy sources, thereby offering a novel solution for fault diagnosis in smart distribution networks.

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