摘要
针对传统隔离方法不能准确判断馈线故障区段,导致隔离时间过长、直流电压峰值高的问题,提出了一种基于网架结构和关联矩阵的配电网馈线故障区段自动隔离方法。首先根据典型的配电网网架结构搭建了配电网模型,获取配电网节点的关联矩阵;根据配电网主站馈线故障类型获取故障等效电路;根据关联矩阵元素取值生成馈线开关开断前的电流,提供故障判断和定位依据,优化故障区段自动隔离流程,完成配电网主站馈线故障区段自动隔离方法的设计。将设计方法应用于配电网发生单相接地短路故障时的馈线自动隔离算例中。结果表明:在不同位置的故障区段下,与两种传统方法相比,设计故障区段自动隔离方法能有效降低故障直流电流的峰值,清除故障电流的耗时更短。所提方法具有较高的准确率和效率,提高了系统的可靠性和经济性。
A new automatic isolation method for feeder fault sections in a distribution network based on grid structure and correlation matrix was proposed to address the issue of traditional isolation methods not being able to accurately determine the fault section of the feeder line,resulting in long isolation time and high peak DC voltage.Firstly,a distribution network model was built based on a typical distribution network structure to obtain the correlation matrix of distribution network nodes;the equivalent circuit of the fault was obtained based on the type of feeder fault in the main station of the distribution network;the current was generated before the disconnection of the feeder switch based on the values of the correlation matrix elements,so as to provide the fault diagnosis and positioning basis,optimize the automatic isolation process of the fault section,and complete the design of the automatic isolation method for the feeder fault section of the network main station.The design method was applied to an example of automatic isolation of feeder lines in the event of a single-phase grounding short circuit fault in a distribution network.The results show that,compared with two traditional methods,the design of automatic isolation method for fault sections can effectively reduce the peak value of fault DC current and reduce the time required to clear fault current in different fault sections.The proposed method has high accuracy and efficiency,improving the reliability and economy of the system.
作者
张裕
陈巨龙
李震
张兆丰
廖泽伟
Zhang Yu;Chen Julong;Li Zhen;Zhang Zhaofeng;Liao Zewei(Power Grid Planning Research Center,Guizhou Power Grid Co.,Ltd.,Guiyang Guizhou 550033,China;Electrical Engineering College,Guizhou University,Guiyang Guizhou 550025,China)
出处
《电气自动化》
2024年第3期34-37,共4页
Electrical Automation
基金
中国南方电网有限责任公司科技项目“多能源系统智能控制与仿真实验室建设(一期)课题4”(GZKJXM20200776)。
关键词
网架结构
关联矩阵
配电网
馈线故障
自动隔离
grid structure
correlation matrix
distribution network
feeder fault
automatic isolation
