基于S变换标准模板相似度的电压暂降分类  

S-Transform Based Classification for Voltage Dips According to Standard Template Similarity

作　　者：李康瑞[1] 杨洪耕[1] 

机构地区：[1]四川大学电气信息学院,成都610065

出　　处：《电工技术学报》2010年第12期139-146,153,共9页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(50677041)

摘　　要：提出了一种基于S变换的标准模板相似度的电压暂降分类方法。采用双线性插值尺度变换形成各类持续时间不同暂降的全局模板;提取全局模板中最能反映该类暂降特征的特定部分建立该类暂降的唯一标准模板。将未知暂降信号的模时频矩阵经尺度变换和局部化提取后的实测局部模板与标准模板做相似度对比,依据模板相似度最大原则进行分类。该方法有效利用局部区域明确的时频相关性,抗干扰能力强,解决了持续时间不同的暂降信号需建立不同模板的问题,分类过程简洁直观。Matlab仿真和实际试验结果显示,该方法在噪声情况下可准确对所考查的暂降信号进行分类,是一种有效的电压暂降分类方法。A classification method for voltage dips based on S-transform according to standard template similarity is proposed.Standard template is established as below：Bilinear-interpolation is firstly adopted to form overall templates for dips of each type with different time duration,and then the part of overall template representing the dip characters is extracted as standard template.The similarity is calculated between standard and actual partial template established by scale transform and character extraction to the dip signal of the unknown type.Then classification is accomplished according to the principle of maximum similarity.Effectively using the clear time-frequency relation in local region,this method has strong anti-jamming capability and can classify voltage dips of different time duration with one standard template each type in a simple and clear way.The Matlab simulation and test results show that it is an effective method for voltage dips classification.

关 键 词：S变换 时频尺度变换 标准模板相似度 电压暂降分类 

分 类 号：TM711[电气工程—电力系统及自动化]