基于相量校正的多源配电网故障区段定位  

Fault section location of multi-source distribution network based on phasor correction

作　　者：梁英达 田书[1] 刘明杭 LIANG Yingda;TIAN Shu;LIU Minghang(School of Electrical Engineering and Automation,Henan Polytechnic University,Jiaozuo 454000,China)

机构地区：[1]河南理工大学电气工程与自动化学院,河南焦作454000

出　　处：《电力系统保护与控制》2023年第1期33-42,共10页Power System Protection and Control

基　　金：国家自然科学基金项目资助(61403127)。

摘　　要：为简化含分布电源的配电网故障定位算法过程,并提高故障定位算法的容错性,以矩阵算法为基础提出一种改进的区段定位算法。首先,建立描述节点区段关系的结构描述矩阵,并通过判断是否检测到过电流及过流方向建立故障信息矩阵。然后,利用结构描述矩阵和故障信息矩阵相乘得到故障判断矩阵,并根据区段对应矩阵中行元素构成的不同将区段划分类型,建立各类型区段下反映所有故障情况的故障判据。最后,对照故障判断矩阵行元素与故障判据,判断出发生故障的区段。针对配网中FTU上传信息易发生畸变的情况,提出了基于相量校正的信息畸变校正方法,通过故障电流与正常运行电流相位差异进行定位结果的修正,降低故障信息畸变对定位结果的影响。对DG的投切状况以及配电网两相和三相短路的单重多重故障进行仿真,结果验证了所提故障定位算法的原理简单、准确度好并具有一定的容错能力。To simplify the process of using a distribution network fault location algorithm with distributed generation,and to improve the fault tolerance of the algorithm,an improved section location algorithm is proposed based on a matrix algorithm.First,a structural description matrix to describe the relationship between node and sections is established.To determine whether the overcurrent and its direction are detected,the fault information matrix is established.Then,the fault judgment matrix is obtained by multiplying the structural description matrix and the fault information matrix.The section is divided into different types according to the row elements in the section corresponding matrix,and the fault criterion is established to reflect all the fault conditions in each type of section.Finally,the fault section is determined by comparing the row elements of the fault judgment matrix and the fault criterion.Since FTU upload information is prone to distortion in a distribution network,this paper proposes an information distortion correction method based on phasor correction.The positioning results are corrected by the phase difference between the fault current and the normal operation current,and the influence of fault information distortion on the positioning results is reduced.The switching status of DG and the single and multiple faults of two-phase and three-phase short circuits in a distribution network are simulated.The simulation results verify that the fault location algorithm proposed in this paper is simple in principle,has good accuracy and a certain fault tolerance.

关 键 词：配电网区段定位 分布式电源 矩阵算法 信息畸变 FTU 

分 类 号：TM73[电气工程—电力系统及自动化]