基于压缩感知的配电网电压暂降故障节点检测  

Distribution network voltage sag fault node detection based on compressed sensing

作　　者：方璟[1] FANG Jing(Wuhan NARI Limited Liability Company of State Grid Electric Power Research Institute,Wuhan 430074,China)

机构地区：[1]国网电力科学研究院武汉南瑞有限责任公司,湖北武汉430074

出　　处：《电子设计工程》2022年第7期135-138,143,共5页Electronic Design Engineering

摘　　要：以往使用的阻抗法、行波法受到不完全电压暂降故障信号的影响,导致相角变化幅度检测结果不精准,从而影响对故障节点的检测效果。对此,文中提出了基于压缩感知的配电网电压暂降故障节点检测方法。根据电压暂降信号的幅值、时长和相位跳变情况,对电压暂降信号进行稀疏性分析,实现对信号的压缩采样;建立测量矩阵,减小检测信号的尺寸,完成信号压缩,通过信号重构得到原始信号。根据节点个数和区段,计算监测点位的电压跌落幅度,并对比实测的跌落数据与数据库数据,确定故障节点所在的区段。由实验结果可知,该方法判断出离母线1点最远的节点是6,该点相角变化最小为-0.5 rad;离母线1点最近的节点是2,该点相角最大为-0.9 rad。上述结果与实际情况一致,证明其具有较好的检测效果。The impedance method and traveling wave method used in the past are affected by incomplete voltage sag fault signals,which leads to inaccurate detection results of phase angle variation amplitude,thus affecting the detection effect of fault nodes.Therefore,this paper proposes a voltage sag fault node detection method based on compressed sensing in distribution network.According to the amplitude,duration and phase jump of the voltage sag signal,the sparse analysis of the voltage sag signal is carried out to realize the compressed sampling of the signal.The measurement matrix is established to reduce the size of the detection signal,and the signal compression is completed.The original signal is obtained through signal reconstruction.According to the number of nodes and sections,the voltage drop amplitude of monitored points is calculated,and the measured drop data and database data are compared to determine the section where the fault node is located.According to the experimental results,the method determines that the node farthest from the bus point 1 is 6,and the minimum phase angle change of this node is-0.5 rad.The node closest to the bus point 1 is 2,with the maximum phase angle change of-0.9 rad.The above results are consistent with the actual situation,which proves that the method has a good detection effect.

关 键 词：压缩感知 配电网 电压暂降 故障节点检测 

分 类 号：TM727[电气工程—电力系统及自动化]