Distribution Network Fault Routing Method Based on Zero Sequence Equivalent Conductor Phase Angle Trajectory Identification

Aiming at the difficult problem of high-resistance grounding fault routing in distribution networks, the zero-sequence voltage is actively adjusted by an active inverter, and the zero-sequence voltage amplitude modulation coefficient is changed to accurately identify the grounding fault feeders in distribution networks according to the phase angle trajectories of zero-sequence equivalent conductors of faulty and non-faulty feeders under different grounding modes. Simulation analysis shows that the proposed method can be applied to three-phase parameter asymmetrical distribution networks, and the measured phase angle trajectories have obvious trends, and the resistance to transition resistance can reach more than 5k Ω. The identification of faulty feeders with low-resistance and high-resistance ground faults can be realized in different operation modes, with simple operation and strong applicability.