基于时频原子灰色关联的小电流接地故障选线方法

发布时间：2018-07-28 12:49

【摘要】：提出一种时频原子灰色关联的小电流接地故障选线方法。根据当前小电流接地系统分支线路数目,计算故障线与非故障线的线路基准值;以Gabor原子库为索引,利用匹配追踪法将各分支线路故障后首个1/4周期内的暂态零序电流进行时频原子分解,求得表征各分支线路故障特征信息的衰减正弦量原子;采用改进灰色关联分析对各衰减正弦量原子进行关联度分析,求得各分支线路的特征值;将各特征值分别与故障线和非故障线的基准值求欧式距离并比较大小,通过所求欧式距离大小的比较,可实现准确选线。仿真结果表明,该方法计算量小,选线精度高,尤其适用于多分支线路的小电流接地系统。
[Abstract]:In this paper, a method of low current grounding fault line selection based on gray correlation of time frequency atoms is proposed. According to the number of branch lines in the current low-current grounding system, the line reference values of the fault line and the non-fault line are calculated, and the Gabor atomic library is used as the index. The transient zero-sequence current in the first 1 / 4 period after each branch line fault is decomposed by time-frequency atom by matching tracing method, and the attenuated sinusoidal atom representing the fault characteristic information of each branch line is obtained. The modified grey correlation analysis is used to analyze the correlation degree of each attenuated sinusoidal atom, and the eigenvalues of each branch line are obtained, and the Euclidean distance is calculated and compared with the reference values of the fault line and the non-fault line, respectively. The accurate line selection can be realized by comparing the distance between Europe and Europe. The simulation results show that the proposed method has the advantages of low computational complexity and high accuracy of line selection, and is especially suitable for small current grounding systems with multi-branch lines.
【作者单位】：河南理工大学电气工程与自动化学院;
【基金】：国家自然科学基金资助项目(61403127) 河南省教育厅科学技术研究重点资助项目(12B470002,14A470004)
【分类号】：TM862

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