基于小波能谱的发电机转子匝间短路故障分析
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摘要
本文将小波多分辨率分析与小波能量谱分析运用到发电机转子发生匝间短路时在定子并联支路产生的电压差与环流信号的分析中,并对信号进行了小波包软阈值去噪。采用Mallat算法对信号进行快速分解与重构。通过大量的仿真试验,采用了第6高频细节的小波能量作为转子匝间短路故障特征提取信号,并与参考文献[2]分析结果进行了对比。该方法更加准确地反映故障特征,特别在并网负载运行的条件下。
In this paper,Multi-resolution analysis and Wavelet Energy spectrum are used to analyze the signals of differential voltage and circular current when the rotor windings are faulty,using wavelet packet to reduce noise of signals.Mallat’s decomposition algorithm is applied to decompose the signals.Wavelet energy of the 6th detail is adopted to extract feature of the rotor wingding fault.Comparing to document[2],the method mentioned in this paper can reflect the feature of the faulty more effectively,especially in power network operation with load.
In this paper,Multi-resolution analysis and Wavelet Energy spectrum are used to analyze the signals of differential voltage and circular current when the rotor windings are faulty,using wavelet packet to reduce noise of signals.Mallat’s decomposition algorithm is applied to decompose the signals.Wavelet energy of the 6th detail is adopted to extract feature of the rotor wingding fault.Comparing to document[2],the method mentioned in this paper can reflect the feature of the faulty more effectively,especially in power network operation with load.
引文
[1]姜建国,史家燕,等译.电机的状态监测[M].水利电力出版社,1992:85-102.
[2]李永刚,李和明,赵华,等.基于定子线圈探测的转子匝间短路故障识别方法[J].中国电机工程学报,2004,24(2):107-112.
[3]李和明,万书亭,李永刚.基于定子绕组并联支路环流特性的发电机故障识别方法[J].电力系统自动化,2005,(6):75-78.
[4]何正友,钱清泉.电力系统暂态信号的小波分析方法及其应用(一)小波变换在电力系统暂态信号分析中的应用综述[J].电力系统自动化学报,2002,(4):1-5.
[5]彭玉华.小波变换与工程应用[M].北京:科学出版社,2002.
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[7]何正友,陈小勤.基于多尺度能量统计和小波能量熵测度的电力暂态信号识别方法[J].中国电机工程学报,2006,(5):34-39.
[8]Young-Jun Kim,Jang-Mok Kim,Byeong-Yeol Yoon,Sang-Hyuk Lee,Tae-Uk Jung.Detection of shorted-turns in the rotor winding of cylindrical synchronous generators using discrete wavelet transform[C].//Applied Power Electronics Conference and Exposition,2006.APEC'06.Twenty-First Annual IEEE,19-23 March 2006.
[9]Abbaszadeh K.,Milimonfared J.,Haji M.,Toliyat H.A..Broken bar detection in induction motor via wavelet transformation[C].//Industrial Electronics Society,2001.IECON'01.The 27th Annual Conference of the IEEE Volume 1,29 Nov.-2 Dec.2001:95–99.
[2]李永刚,李和明,赵华,等.基于定子线圈探测的转子匝间短路故障识别方法[J].中国电机工程学报,2004,24(2):107-112.
[3]李和明,万书亭,李永刚.基于定子绕组并联支路环流特性的发电机故障识别方法[J].电力系统自动化,2005,(6):75-78.
[4]何正友,钱清泉.电力系统暂态信号的小波分析方法及其应用(一)小波变换在电力系统暂态信号分析中的应用综述[J].电力系统自动化学报,2002,(4):1-5.
[5]彭玉华.小波变换与工程应用[M].北京:科学出版社,2002.
[6]郑治真,等,小波变换及其MATLAB工具的应用[M].地震出版社,2001:43-59.
[7]何正友,陈小勤.基于多尺度能量统计和小波能量熵测度的电力暂态信号识别方法[J].中国电机工程学报,2006,(5):34-39.
[8]Young-Jun Kim,Jang-Mok Kim,Byeong-Yeol Yoon,Sang-Hyuk Lee,Tae-Uk Jung.Detection of shorted-turns in the rotor winding of cylindrical synchronous generators using discrete wavelet transform[C].//Applied Power Electronics Conference and Exposition,2006.APEC'06.Twenty-First Annual IEEE,19-23 March 2006.
[9]Abbaszadeh K.,Milimonfared J.,Haji M.,Toliyat H.A..Broken bar detection in induction motor via wavelet transformation[C].//Industrial Electronics Society,2001.IECON'01.The 27th Annual Conference of the IEEE Volume 1,29 Nov.-2 Dec.2001:95–99.
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