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四川大学电气工程学院,四川省成都市 610065
Received:15 September 2020,
Revised:2020-12-17,
Published Online:25 March 2021,
Published:10 June 2021
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汪颖,谢佳妮,邓凌峰等.基于典型波形特征与改进DBSCAN的电压暂降同源识别方法[J].电力系统自动化,2021,45(11):126-135.
WANG Ying,XIE Jiani,DENG Lingfeng,et al.Identification Method for Same-source Voltage Sags Based on Typical Waveform Characteristics and Improved Density-based Spatial Clustering of Applications with Noise[J].Automation of Electric Power Systems,2021,45(11):126-135.
汪颖,谢佳妮,邓凌峰等.基于典型波形特征与改进DBSCAN的电压暂降同源识别方法[J].电力系统自动化,2021,45(11):126-135. DOI: 10.7500/AEPS20200915002.
WANG Ying,XIE Jiani,DENG Lingfeng,et al.Identification Method for Same-source Voltage Sags Based on Typical Waveform Characteristics and Improved Density-based Spatial Clustering of Applications with Noise[J].Automation of Electric Power Systems,2021,45(11):126-135. DOI: 10.7500/AEPS20200915002.
针对电网内单次短路故障可能触发多条母线上的电能质量监测装置记录电压暂降波形,造成电压暂降录波数据冗余、电网电压暂降水平过估计的问题,提出一种基于典型波形特征与改进基于密度的有噪空间聚类(DBSCAN)的电压暂降同源识别方法。首先,提出综合倾斜因子、波形相似度和持续时间三维特征,综合刻画电压暂降同源性;同时,研究电压暂降经多级变压器的传播特性,推导出13种变压器相电压等效传递矩阵,并提出基于Bhattacharyya距离的波形相似度计算方法。其次,利用共享近邻点(SNN)改进DBSCAN,对由三维特征构成的矩阵进行同源聚类,提出基于电网节点总数和监测点总数的聚类参数计算方法,实现电压暂降同源识别。应用实测数据和IEEE 30节点系统仿真数据进行验证,结果证明了所提方法的正确性和有效性。
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.
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