故障电流与励磁涌流的EMD特性分析  

Characteristics analysis of fault current and inrush based on EMD

作　　者：倪良华[1] 姚春球[1] 

机构地区：[1]南京工程学院电力工程学院,江苏南京211167

出　　处：《电力系统保护与控制》2009年第10期27-32,共6页Power System Protection and Control

摘　　要：从IMF(intrinsic mode functions)需满足的两个条件出发,定性分析了故障电流、非对称涌流、对称涌流经过EMD(empirical mode decomposition)分解后各自的IMF波形组成特征。在此基础上提出主导IMF概念,并利用IMF的能量特征对主导IMF进行提取,然后采用故障电流与涌流不同的主导IMF组成特征对其进行区分。另外,理论分析考察了恒定直流分量和衰减非周期分量对IMF组成特征的影响。在Matlab下对动模仿真数据分析结果表明了故障电流与涌流在主导IMF构成上差别明显,是一个识别涌流的简单实用判据。Focused on,the two conditions which IMF （intrinsic mode functions） needs to meet, the IMF characteristics of fault current, non-symmetrical inrush and symmetrical inrush are analyzed qualitatively after EMD （empirical mode decomposition） decomposition. On the basis of self-defined IMF-led extracted by its energy characteristics, both inrush current and fault current of power transformers can be distinguished by their IMF-led characteristics. In addition, this paper analyzes the impact on IMF characteristics made by constant DC components and decaying DC components in theory. The MATLAB analysis conducted from dynamic simulation data shows that the IMF difference between fault current and inrush is obviously, and can be used to identify inrush simply and practical.

关 键 词：经验模态分解(EMD) 本征模函数(IMF) 励磁涌流 故障电流 

分 类 号：TM772[电气工程—电力系统及自动化]