公开(公告)号：US20250167541A1

公开(公告)日：2025-05-22

申请号：US18898636

申请日：2024-09-26

Applicant: Kunming University of Science and Technology

Inventor： Hongchun SHU ,  Jun DONG ,  Yutao TANG ,  Yuan GAO ,  Yiming HAN ,  Weijie LOU ,  Guangxue WANG ,  Hongfang ZHAO

IPC: H02H7/22 ,  H02H1/00

Abstract: The provided are a method, system, and medium for active arc-extinguishing voltage-current conversion in distribution networks. The method includes: detecting a single-phase-to-ground fault in the distribution network and identifying the target faulty phase; injecting compensating currents into the target faulty phase to reduce its voltage; measuring the residual current at the fault point during the injection of compensating currents and the zero-sequence voltage of the target faulty phase; determining a critical zero-sequence voltage threshold based on the residual current at the fault point and assessing whether this critical value exceeds the present zero-sequence voltage; if so, ceasing the injection of compensating currents into the target faulty phase and instead injecting active arc-extinguishing currents at the neutral point of the distribution network to mitigate ground currents at the grounding points of the distribution network. The objective is to enhance the applicability of arc-extinguishing methods for ground faults in distribution networks.

公开(公告)号：US20250158400A1

公开(公告)日：2025-05-15

申请号：US18945526

申请日：2024-11-13

Applicant: KUNMING UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Hongchun SHU ,  Jun DONG ,  Yuan GAO ,  Yutao TANG ,  Yiming HAN ,  Kaiqing TIAN

IPC: H02J3/00 ,  G01R31/52 ,  H02H9/08

Abstract: This application presents an adaptive arc suppression method for ground faults in distribution networks, merging active and passive relay protection strategies. The method proceeds as follows: based on collected ground parameters, the fault phase is identified; compensation current is calculated from the fault's electromotive force, ground leakage resistance, and ground capacitance; current is injected at the neutral point according to the compensation current; finally, the arc suppression scheme is executed based on the zero-sequence voltage of the network's busbars. This approach incorporates both voltage- and current-based methods, addressing the limitation of fixed operation scenarios in traditional arc suppression methods. By quickly adapting to various fault situations, this method ensures an efficient and prompt response tailored to specific scenario requirements.