基于S变换行波能谱矩阵相似度的柔性直流单端保护方案  

Single-end Flexible DC Protection Scheme Based on Similarity of S-transform Energy Spectrum Matrix of Traveling Wave

作　　者：权文杰 童晓阳[1] 张广骁 QUAN Wenjie;TONG Xiaoyang;ZHANG Guangxiao(School of Electrical Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学电气工程学院,四川省成都市610031

出　　处：《电力系统自动化》2022年第7期178-186,共9页Automation of Electric Power Systems

基　　金：四川省科技厅重点研发计划资助项目(2017GZ0054)。

摘　　要：针对现有柔性直流线路保护耐受高阻、噪声干扰、区内远端高阻故障拒动等问题,提出一种基于行波能谱矩阵相似度的柔性直流线路单端保护方案。通过分析柔性直流电网限流电感的边界作用,得到区内、区外故障电压行波在时域和频域上的差异,利用S变换,构造能谱矩阵,加大区内、区外故障在能量谱分布上的差异,通过主成分分析法降维,减少样本数据的存储空间。利用归一化互相关系数,获得故障能谱矩阵与故障样本矩阵之间的相似度,构造柔性直流单端保护判据,判别区内、区外故障。考虑了架空线路易遭受雷击的因素,构建雷击干扰识别判据。仿真结果表明,所提保护方案不受故障位置、高阻、噪声干扰等影响。For the problems of high-resistance tolerance,noise interference,and operation refusal on remote high-resistance internal fault of the existing flexible DC line protection,this paper proposes a single-end protection scheme for the flexible DC transmission line based on the similarity of energy spectrum matrix of traveling waves.By analyzing the boundary effect of current limiting inductors in the flexible DC power grid,the difference of voltage traveling waves of internal and external faults in time and frequency domains is obtained.The S-transform is used to construct the energy spectrum matrix to increase the difference of energy spectrum distribution between internal and external faults.The principal components analysis is used to reduce the dimension and the storage space of sample data.By using the normalized cross-correlation coefficient,the similarity between the fault energy spectrum matrix and the fault sample matrix is calculated,and the single-end flexible DC protection criterion is constructed to distinguish the internal and external faults.Considering the factor that overhead lines are vulnerable to lightning,the lightning interference identification criterion is constructed.Simulation results show that the proposed algorithm is not affected by the fault location,the high resistance and the noise interference.

关 键 词：柔性直流电网 直流线路保护 电压行波 S变换 能谱矩阵 雷击干扰 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM773