基于空间故障树理论的配电网弱馈线路断线故障识别方法  

A Disconnection Fault Identification Method of Weak Feeder Lines in Distribution Networks Based on Spatial Fault Tree Theory

作　　者：沈晓枉 SHEN Xiaowang(State Grid Shanghai Urban Electric Power Supply Company,Shanghai 200080,China)

机构地区：[1]国网上海市区供电公司,上海200080

出　　处：《电网与清洁能源》2021年第10期30-35,共6页Power System and Clean Energy

基　　金：国家自然科学基金资助项目(51407114);上海市科委科技创新项目(17020500800)。

摘　　要：针对当前弱馈线路的研究成果较少,一旦发生断线故障则严重威胁电网安全的问题。采用空间故障树理论,提出一种面向弱馈线路的断线故障识别方法。设定时间与温度作为配电网弱馈线路工作状态的主要影响因素,构建空间故障树的空间域,获取断线故障发生后各元件的贡献程度,根据断线故障与各元件故障间的相关性,联立相关性排序中前列元件与割集组合中各事件间的匹配关系,实现断线故障定位;依据线路某相下游电压向量与无线链路控制层协议回路输入电压向量之间的夹角,通过对比夹角绝对值与识别阈值的大小,完成断线故障识别。仿真实验结果表明,所提方法较好地抑制了影响因素的干扰程度,识别结果具有一定的有效性与可信度。At present,there are few research achievements on weak feeder lines,which seriously threaten the safety of power grid in case of a line disconnection fault.Based on the theory of spatial fault tree,a method of disconnection fault identification for weak feeder lines is proposed.With time and temperature set as the main influencing factors of the working state of the weak feeder in the distribution network,the spatial domain of the spatial fault tree is constructed to obtain the contribution degree of each component after the disconnection fault occurs.According to the correlation between the disconnection fault and each component fault,the matching relationship between the top components in the correlation ranking and the events in the cut set combination is established to realize the disconnection fault location,and according to the angle between the downstream voltage vector of a line phase and the input voltage vector of the protocol loop of the wireless link control layer,by comparing the absolute value of the angle with the recognition threshold,the broken line fault identification is completed.The simulation results show that the proposed method can effectively suppress the interference degree of the influencing factors,and the recognition results have certain validity and credibility.

关 键 词：空间故障树理论 配电网 弱馈线路 断线故障 故障识别 空间域 

分 类 号：TM755[电气工程—电力系统及自动化]