广义S变换在电能质量扰动识别中的应用
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摘要
针对电能质量扰动信号检测和定位问题,提出一种基于广义S变换的动态电能质量的识别方法。首先推导广义S变换的离散公式,并把典型扰动变换到相空间中,从不同角度提取扰动相空间中的特征量,判断扰动高频奇异点,对所得的结果进行分析并与S变换进行比较。结果表明,广义S变换比标准S变换更具有灵活的时频聚焦性。不仅能有效地检测到电压幅值的瞬时变化,而且能准确判断频率的变化,特别是高次分量。此外,在间谐波和相位检测方面效果良好。
A new method based on Generalized S-transform(GST)was proposed for detecting and identifying power quality disturbances(PQDs).The GST transform formula of discrete time series is deduced firstly.Then trans-form typical PQDs into the phase space by GST,abstract effective characteristic quantity and locate the high-frequency singular points.Comparing with S-transform(ST),example results show that the GST method not only can effectively detect changes in voltage amplitude of the transient,but can accurately determine the frequency of changes.Meanwhile,the propsed method is quite useful for inter-harmonics and phase detection.
A new method based on Generalized S-transform(GST)was proposed for detecting and identifying power quality disturbances(PQDs).The GST transform formula of discrete time series is deduced firstly.Then trans-form typical PQDs into the phase space by GST,abstract effective characteristic quantity and locate the high-frequency singular points.Comparing with S-transform(ST),example results show that the GST method not only can effectively detect changes in voltage amplitude of the transient,but can accurately determine the frequency of changes.Meanwhile,the propsed method is quite useful for inter-harmonics and phase detection.
引文
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[2]刘守亮,肖先勇,杨洪耕(Liu Shouliang,XiaoXianyong,Yang Honggeng).基于S变换模时频矩阵相似度的短时电能质量扰动分类(Classificationof short duration power quality disturbance based onmodule ti me-frequency matrixes si milarity by S-transform)[J].电网技术(Power System Technolo-gy),2006,30(5):67-71.
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[6]陈学华,贺振华(Chen Xuehua,He Zhenhua).改进的S变换及在地震信号处理中的应用(I mproved S-transform and its application in seismic signal pro-cessing)[J].数据采集与处理(Journal of Data Acqui-sition&Processing),2005,20(4):449-453.
[7]陈学华,贺振华,黄德济(Chen Xuehua,He Zhenhua,Huang Deji).广义S变换及其时频滤波(GeneralizedS transformandits ti me-frequency filtering)[J].信号处理(Signal Processing),2008,24(1):28-31.
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[9]全惠敏,戴瑜兴(Quan Hui min,Dai Yuxing).基于S变换模矩阵的电能质量扰动信号检测与定位(Detec-tion and localization of power quality disturbancesbased on S-transform module matrixes)[J].电工技术学报(Transactions of China Electrotechnical Socie-ty),2007,22(8):119-125.
[10]占勇,程浩忠,丁屹峰,等(Zhan Yong,Cheng Ha-ozhong,Ding Yifeng,et al).基于S变换的电能质量扰动支持向量机分类识别(S-transform-basedclassification of power quality disturbance signals bysupport vector machines)[J].中国电机工程学报(Proceedings of the CSEE),2005,25(4):51-56.
[11]杨淑英,王丽宏,杜荣华,等(Yang Shuying,WangLihong,Du Ronghua,et al).电力系统暂态保护中小波基的选择与应用(Selection and application ofmother wavelet inthe electric power systemtransientprotection)[J].电力系统及其自动化学报(Proceed-ings of the CSU-EPSA),2008,20(5):106-111.
[12]Chilukuri M V,Dash P K.Multiresolution S-trans-form-based fuzzy recognition systemfor power quali-ty events[J].IEEE Trans on Power Delivery,2004,19(1):323-330.
[13]Dash P K,Panigrahi B K,Panda G.Power qualityanalysis using S-transform[J].IEEE Trans on PowerDelivery,2003,18(2):406-411.
[17]石佳,黄纯,李杨(Shi Jia,Huang Chun,Li Yang).一种基于数学形态学的扰动信号分形检测方法(Afractal detection method based on mathematical mor-phology for disturbance signal)[J].电力系统及其自动化学报(Proceedings of the CSU-EPSA),2008,20(5):86-90.
[2]刘守亮,肖先勇,杨洪耕(Liu Shouliang,XiaoXianyong,Yang Honggeng).基于S变换模时频矩阵相似度的短时电能质量扰动分类(Classificationof short duration power quality disturbance based onmodule ti me-frequency matrixes si milarity by S-transform)[J].电网技术(Power System Technolo-gy),2006,30(5):67-71.
[3]Stockwell R G,Mansinha L,Lowe R P.Localizationof the complex spectrum:the S transform[J].IEEETrans on Signal Processing,1996,44(4):998-1001.
[4]Pinnegar C R,Eeton D W.Application of the Stransformto prestack noise attenuation filtering[J].Journal of Geophysical Research,2003,108(B9):2422-2431.
[5]高静怀,陈文超,李幼铭,等(Gao Jinghuai,ChenWenchao,Li Youming,et al).广义S变换与薄互层地震响应分析(Generalized S transform and seis-mic response analysis of thin interbeds)[J].地球物理学报(Chinese Journal of Geophysics),2003,46(4):526-532.
[6]陈学华,贺振华(Chen Xuehua,He Zhenhua).改进的S变换及在地震信号处理中的应用(I mproved S-transform and its application in seismic signal pro-cessing)[J].数据采集与处理(Journal of Data Acqui-sition&Processing),2005,20(4):449-453.
[7]陈学华,贺振华,黄德济(Chen Xuehua,He Zhenhua,Huang Deji).广义S变换及其时频滤波(GeneralizedS transformandits ti me-frequency filtering)[J].信号处理(Signal Processing),2008,24(1):28-31.
[8]吕干云,程浩忠,郑金菊,等(L櫣Ganyun,Cheng Ha-ozhong,Zheng Jinju,et al).基于S变换和多级SVM的电能质量扰动检测识别(Power quality dis-turbances detection and identification based on Stransformand multi-lay SVMs)[J].电工技术学报(Transactions of China Electrotechnical Society),2006,21(1):121-126.
[9]全惠敏,戴瑜兴(Quan Hui min,Dai Yuxing).基于S变换模矩阵的电能质量扰动信号检测与定位(Detec-tion and localization of power quality disturbancesbased on S-transform module matrixes)[J].电工技术学报(Transactions of China Electrotechnical Socie-ty),2007,22(8):119-125.
[10]占勇,程浩忠,丁屹峰,等(Zhan Yong,Cheng Ha-ozhong,Ding Yifeng,et al).基于S变换的电能质量扰动支持向量机分类识别(S-transform-basedclassification of power quality disturbance signals bysupport vector machines)[J].中国电机工程学报(Proceedings of the CSEE),2005,25(4):51-56.
[11]杨淑英,王丽宏,杜荣华,等(Yang Shuying,WangLihong,Du Ronghua,et al).电力系统暂态保护中小波基的选择与应用(Selection and application ofmother wavelet inthe electric power systemtransientprotection)[J].电力系统及其自动化学报(Proceed-ings of the CSU-EPSA),2008,20(5):106-111.
[12]Chilukuri M V,Dash P K.Multiresolution S-trans-form-based fuzzy recognition systemfor power quali-ty events[J].IEEE Trans on Power Delivery,2004,19(1):323-330.
[13]Dash P K,Panigrahi B K,Panda G.Power qualityanalysis using S-transform[J].IEEE Trans on PowerDelivery,2003,18(2):406-411.
[17]石佳,黄纯,李杨(Shi Jia,Huang Chun,Li Yang).一种基于数学形态学的扰动信号分形检测方法(Afractal detection method based on mathematical mor-phology for disturbance signal)[J].电力系统及其自动化学报(Proceedings of the CSU-EPSA),2008,20(5):86-90.
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