基于保护信息的城市电网故障元件定位方法  

Method of fault component diagnosis in the urban power grid based on relay protection information

作　　者：陈星莺[1] 常慧[1] 余昆[1] 李振坤[1] 陈旦[1] 

机构地区：[1]河海大学能源与电气学院,江苏南京210098

出　　处：《电力系统保护与控制》2010年第21期67-71,共5页Power System Protection and Control

基　　金：国家自然科学基金项目(51077043)~~

摘　　要：智能电网建设要求城市电网能灵活改变运行方式,在故障发生后能及时恢复对失电负荷的供电。通过对城市电网的运行方式特点和保护动作信息进行分析,建立保护与元件的双向关联模型,以及保护与可能故障元件的关联矩阵模型,提出利用该模型计算所有可能故障元件的故障可信度,以该指标定位城市电网中的故障元件。将保护分为确定性保护和非确定性保护,通过扩大确定性保护在关联矩阵中的取值来避免故障信息在计算过程中被湮灭,以处理拒动和多重故障等复杂情况。实际城市电网的多个案例仿真分析结果表明,关联矩阵中充分包含了故障信息,提出的城市电网故障元件定位方法简单实用。Smart grid requires the urban power grid having flexible operation structure and can restore the lost load in time when fault occurs.Through analyzing the characteristic of operation structure of the urban power grid and its relay protection act information,bidirectional relating model between relay protections and components is built.And then the relating matrix of relay protections and likely fault components is formed.The reliability that fault occurred in some component is calculated by the model presented in this paper.And this index is proposed to diagnose the fault component in the urban power grid.The relay protection is divided into two types：definite protection and non-definite protection.The value of definite protection in relating matrix is enlarged to be a larger positive integer to prevent the fault information withering away in the calculation process,which makes the algorithm be able to deal with complication instance,such as rejecting act of relay protection or breaker,multiple faults,and so on.Simulation test is carried out on data of an actual urban power grid.The result indicates that fault information is entirely contained in the relating matrix,and the diagnosis method of fault information proposed in this paper is simple and practical.

关 键 词：城市电网 自愈控制 故障元件定位 保护信息 关联矩阵 多重故障 

分 类 号：TM76[电气工程—电力系统及自动化]