基于稀疏分解与综合测度值的配电网故障选线方法  

Fault Line Selection Method Based on Sparse Decomposition and Comprehensive Measure Values for Distribution Network

作　　者：杨德昌[1] 魏向向[1] 温渤婴[1] 王晓卫[2,3] 

机构地区：[1]中国农业大学信息与电气工程学院,北京100083 [2]西安交通大学电气工程学院,西安710049 [3]河南理工大学电气工程与自动化学院,焦作454000

出　　处：《高电压技术》2017年第5期1526-1534,共9页High Voltage Engineering

基　　金：国家自然科学基金青年基金(51407186;61403127)~~

摘　　要：为提高基于暂态量选线方法的准确性和鲁棒性,同时尽可能多的包含故障信息,提出了一种基于稀疏分解与综合测度值的配电网故障选线方法。首先,利用匹配追踪算法对故障瞬间2个周期内的暂态零序电流进行4次迭代分解;然后,选取1/4周期内的最佳原子作为研究对象,一方面计算原子奇异熵,另一方面利用最佳原子重构得到特征原子,并计算其实际能量;最后,以归一化后原子奇异熵的倒数为自变量,构造了故障信任度函数,进而构造了能够多角度量化故障信息的故障综合测度函数,最大故障综合测度值对应的线路被选取为故障线路。仿真结果表明:故障发生时,求得的故障线路综合测度值大于健全线路综合测度值,基于该特性得到的选线结果不受故障线路类型、故障相角、过渡电阻和故障距离的影响。In order to contain fault information as much as possible and improve the accuracy and robustness of fault line selection based on the transient feature, we propose a novel fault line selection method based on sparse decomposition and comprehensive measure for distribution network. Firstly, when fault occurs, matching pursuits method is introduced to decompose the transient zero sequence current of the first 2 cycles, and the iterations are set to 4. Secondly, the best atoms of first 1/4 cycle are selected as the study object, on the one hand, the atomic singular entropy is computed, on the other hand, the feature atoms is obtained after reconstructing best atoms, and the actual energy of feature ato/ns are calculated. Finally, the fault confidence function is constructed, whose independent variable is the reciprocal of atomic singular en- tropy after normalizing. Thereby, the fault comprehensive measurement function is built, by which the fault information can be quantified in different perspectives. And the line with the maximum of fault comprehensive measure is chosen as the fault line. It can be known from the simulation results that, when the fault occurs, the obtained comprehensive meas- ure of fault line is larger than that of the healthy lines, the selection results based on this feature are not affected by fault line types, fault angles, grounding resistors, and fault locations.

关 键 词：故障选线 匹配追踪算法 最佳原子 原子奇异熵 特征原子 故障信任度函数 故障综合测度函数 

分 类 号：TM862[电气工程—高电压与绝缘技术]