基于动态时间弯曲距离的小电流接地故障区段定位方法

发布时间：2018-06-07 08:11

本文选题：配电网 + 动态时间弯曲　；参考：《电网技术》2016年03期

【摘要】：动态时间弯曲(dynamic time warping,DTW)距离可度量2个时间序列的相似性,且具有良好的耐同步误差特性和容错特性。配电网发生单相接地故障时,流过线路健全区段两侧的暂态零序电流几乎为同一电流,采样数据差异小,DTW距离也较小;而流过故障区段两侧的暂态零序电流存在明显差异,DTW距离较大;据此,提出一种基于暂态零序电流数据DTW距离的配电网小电流接地故障区段定位方法。当各馈线终端(feeder terminal unit,FTU)启动算法检测到接地故障发生后,将检测到的故障前后共1个工频周期的暂态零序电流采样数据上传主站,主站基于给定的故障区段搜索策略,通过计算相关暂态零序电流的DTW距离确定故障所在区段。该方法区段搜索效率高,故障定位速度快,各FTU启动时间同步误差及上传数据误码对定位准确性影响小。仿真结果验证了所提方法的正确性与有效性。
[Abstract]:Dynamic time warping time distance can measure the similarity of two time series, and has good synchronization tolerance and fault tolerance. When the single-phase grounding fault occurs in the distribution network, the transient zero-sequence current flowing through the two sides of the sound section of the line is almost the same current, and the difference of the sampling data is small, and the DTW distance is also small. The difference of transient zero sequence current between the two sides of fault section is obvious, and the distance of transient zero sequence current is large. Based on the DTW distance of transient zero sequence current data, a method for locating the fault zone of small current grounding in distribution network is proposed. When the feeder terminal Unit (FTU) algorithm detects the ground fault, the transient zero-sequence current sampling data of one power frequency period before and after the detected fault are uploaded to the master station, and the master station is based on the given fault section search strategy. The fault zone is determined by calculating the DTW distance of the correlated transient zero sequence current. The section search efficiency of this method is high, the fault location speed is fast, the synchronization error of each FTU startup time and the error code of uploading data have little influence on the location accuracy. Simulation results show that the proposed method is correct and effective.
【作者单位】：湖南大学电气与信息工程学院;
【基金】：国家863高技术基金项目(2011AA05A114)~~
【分类号】：TM862

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