Identification Method for Same-source Voltage Sags Based on Typical Waveform Characteristics and Improved Density-based Spatial Clustering of Applications with Noise

被引：0
|
作者：
Wang Y. [1 ]
Xie J. [1 ]
Deng L. [1 ]
Xiao X. [1 ]
机构：
[1] College of Electrical Engineering, Sichuan University, Chengdu
来源：
Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2021年 / 45卷 / 11期
基金：
中国国家自然科学基金;
关键词：
Bhattacharyya distance; Data redundancy; Density-based spatial clustering of applications with noise (DBSCAN); Overestimation; Same-source identification; Three-dimensional characteristic; Voltage sag;
D O I：
10.7500/AEPS20200915002
中图分类号：
学科分类号：
摘要：
A single short-circuit fault in the power grid may trigger the power quality monitoring devices on multiple bus bars to record the voltage sag waveforms, which results in the redundant recording data and the overestimation of voltage sag. Aiming at these problems, this paper proposes an identification method for same-source voltage sags based on the typical waveform characteristics and the improved density-based spatial clustering of applications with noise (DBSCAN). Firstly, the three-dimensional characteristics of the comprehensive tilt factor, the waveform similarity and the duration are proposed to comprehensively describe the same-source property of voltage sags. At the same time, the propagation properties of voltage sags through multiple levels of transformers are studied, and 13 kinds of equivalent transfer matrices of phase voltage of transformers are derived, while the waveform similarity calculation method based on Bhattacharyya distance is proposed. Secondly, the shared nearest neighbor (SNN) is used to improve DBSCAN, and the same-source clustering of the matrices composed of three-dimensional characteristics is performed. Secondly, a clustering parameter calculation method based on the total number of power grid nodes and the total number of monitoring points is proposed to realize the same-source identification for voltage sags. The measured data and the simulation data of the IEEE 30-bus system are used for verification, and the results verify the correctness and effectiveness of the proposed method. © 2021 Automation of Electric Power Systems Press.
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页码：126 / 135
页数：9
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