摘要
配电网弧光接地故障(arc grounding faults,AGF)易引发保护拒动与次生灾害。现有模型因忽略接地介质击穿与电弧传热效应,难以准确表征弧光高阻接地故障(arc high-resistance grounding faults,AHGF)的动态特性,且传统消弧方法存在高阻工况适应性差的缺陷。为此,首先提出一种计及传热效应的配电网AGF故障模型及混合消弧方法,建立融合介质击穿特性与电阻率温变模型的接地电阻模型。然后,构建变尺寸Mayr-Cassie电弧传热耦合模型,设计无源消弧与有源消弧串联的混合消弧拓扑,降低有源消弧的有功功率占比。最后,基于MATLAB/Simulink仿真与白桦、红土、混凝土3类典型接地介质的真型配电网AGF故障实验结果表明:所提AGF模型能准确有效表征故障特性,其全周期电流波形相关系数达0.8734~0.9173。所提混合消弧方法能对各AHGF故障进行有效、可靠消弧。
Arc grounding faults(AGF)in distribution networks can trigger protection maloperation and secondary hazards.Existing fault models often fail to accurately represent the dynamic characteristics of arc high-resistance grounding faults(AHGF)due to neglected dielectric breakdown and arc heat transfer effects.Additionally,conventional arc suppression methods exhibit poor adaptability under high-resistance conditions.To address these issues,this paper proposes an AGF model incorporating heat transfer effects and a hybrid arc suppression method.A grounding resistance model is established that integrates dielectric breakdown characteristics with temperature-dependent resistivity.A variabledimension Mayr-Cassie arc model with thermal coupling is developed.A series-connected hybrid topology combining passive and active arc suppression is designed to reduce active suppression’s active power consumption.Finally,experimental and simulation results based on MATLAB/Simulink and real distribution network AGF tests with three typical grounding media(birch,red soil,and concrete)demonstrate that,the proposed AGF model can accurately represent fault characteristics,achieving full-cycle current waveform correlation coefficient of 0.8734~0.9173.The proposed hybrid arc suppression method can effectively and reliably suppress various AHGF faults.
作者
蒋冲
范必双
徐向前
黄芸红
王文
喻锟
JIANG Chong;FAN Bishuang;XU Xiangqian;HUANG Yunhong;WANG Wen;YU Kun(College of Electrical and Information Engineering,Changsha University of Science and Technology,Changsha 410114,China;State Key Laboratory of Disaster Prevention&Reduction for Power Grid,Changsha University of Science&Technology,Changsha 410114,China)
出处
《电力系统保护与控制》
北大核心
2025年第15期1-12,共12页
Power System Protection and Control
基金
国家自然科学基金项目资助(52277077)。
关键词
配电网
弧光接地故障
介质击穿
传热效应
混合消弧
distribution network
arc grounding faults
dielectric breakdown
heat transfer effect
hybrid arc suppression
