基于线电压馈入的配电网故障消弧与故障检测方法  

Arc Suppression and Fault Detection Method for DistributionNetwork Faults Based on Line Voltage Feeding

作　　者：许洪华 刘宝稳[2] 许自强 刘德林 于宝淇 XU Honghua;LIU Baowen;XU Ziqiang;LIU Delin;YU Baoqi(Nanjing Power Supply Company,State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 210019,China;College of Energy and Electrical Engineering,Hohai University,Nanjing 211100,China)

机构地区：[1]国网江苏省电力有限公司南京供电分公司,南京210019 [2]河海大学能源与电气学院,南京211100

出　　处：《上海交通大学学报》2025年第2期230-241,I0002-I0004,共15页Journal of Shanghai Jiaotong University

基　　金：江苏省自然科学基金面上项目(SBK2023020122);中国博士后科学基金(2020M671318)资助项目。

摘　　要：为了提高降压消弧装置的可靠性和便捷性,提出基于线电压串调制阻尼接地的零序电压灵活调控方法,并研究其在故障消弧与馈线保护中的应用.首先,利用配电网线电压不受单相接地故障影响的优势,提出采用隔离变压器、消弧线圈等传统无源设备的有源接地装置替代方案,具有灵活调控零序电压幅值和相位的优势;然后,论证配电网分布参数不对称对有源消弧的影响,提出基于无源装置的基波电流全补偿的消弧控制方法;其次,提出线电压接入的故障相电压稳定抬升方法,有效提升高阻故障的检测灵敏度;最后,分析接入线电压和调制阻尼的优化选择方案,给出配网故障消弧与馈线保护综合控制方案,并利用仿真实验证实有效性.实际应用中,仅需把选定的线电压经隔离变压器接入中性点,并与阻感式调制阻尼相配合,可有效降低设备成本,提高设备可靠性和控制便捷性,为配电网接地故障馈线保护和零残流故障消弧提供新方案.In order to improve the reliability and convenience of the voltage-reduction arc suppression device,a zero-sequence voltage flexible control method based on line voltage series modulation damping grounding is proposed,and its application in arc suppression and feeder protection is studied.First,based on the advantage that the line voltage of the distribution network is not affected by single-phase grounding fault,an active grounding device replacement scheme using isolation transformer,arc suppression coil,and other traditional passive devices is proposed,which has the advantage of flexibly regulating the amplitude and phase of zero sequence voltage.Then,the impact of the asymmetric distribution parameters on the active arc suppression is demonstrated,and an arc suppression control method based on full compensation of fundamental current is proposed.Furthermore,a fault phase voltage active lifting method with line voltage access is proposed to effectively improve the detection sensitivity of high resistance faults.Finally,the optimal selection scheme of the accessed line voltage and modulation damping is analyzed,and the integrated control scheme of fault arc suppression and feeder protection in distribution network is given,whose effectiveness is validated by simulation experiment.In practical application,the equipment cost can be reduced only by connecting the selected line voltage to the neutral point through the isolation transformer and cooperating with the resistive modulation damping,which improves the reliability and control convenience of equipment,and provides a new scheme for the grounding fault feeder protection and zero residual current fault arc elimination of the distribution network.

关 键 词：单相接地故障 线电压馈入中性点 故障消弧 馈线接地保护 

分 类 号：TM771[电气工程—电力系统及自动化]