Meyer小波在电力系统谐波检测中的应用
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摘要
目前所采用的小波基函数和快速傅里叶变换算法对谐波信号进行检测分析时存在频带混叠、泄漏现象,使检测出的谐波存在较大的误差,提出了运用具有无限可导性、双正交性和无频带混叠现象的Meyer小波基函数对谐波信号进行小波分解,进而进行准确检测、识别定位的新方法。运用该方法对谐波信号进行仿真试验,并将仿真结果与用db3小波基分析的结果进行了比较,验证了该方法的准确性。
Some problems exists in the detection and analysis of harmonic signals when using current wavelet basis function and fast Fourier transform algorithm, such as spectrum aliasing,spectrum leakage,etc.,and it causes a large error of detected harmonic wave. For the problems,a new accurate detection and identificationmothodis proposed in this paper,which using the Meyerwavelet basis function to make wavelet decomposition on harmonic signals due to its characteristics of infinite conductivity,biorthogonality and no spectrum aliasing phenomenon. After that,a simulation experiment of harmonic signals using this method is conducted and its result is compared with that of db3 wavelet basis analysis,which verified the accuracy and effectiveness of this method.
Some problems exists in the detection and analysis of harmonic signals when using current wavelet basis function and fast Fourier transform algorithm, such as spectrum aliasing,spectrum leakage,etc.,and it causes a large error of detected harmonic wave. For the problems,a new accurate detection and identificationmothodis proposed in this paper,which using the Meyerwavelet basis function to make wavelet decomposition on harmonic signals due to its characteristics of infinite conductivity,biorthogonality and no spectrum aliasing phenomenon. After that,a simulation experiment of harmonic signals using this method is conducted and its result is compared with that of db3 wavelet basis analysis,which verified the accuracy and effectiveness of this method.
引文
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[2]林海雪.电力系统的间谐波来源及其影响[J].电源技术应用,2010,13(5):1-6.
[3]KURAISHI T,KAWADA M,ISAKA K.Development of recursive interpolated D/FFT for on-line and highly accurate frequency analysis[J].IEEJ transactions on electrical and electronic engineering,2008,3(5):574-582.
[4]刘书铭,李琼林,余晓鹏,等.谐波强度对电容器损耗影响的试验研究[J].电力自动化设备,2014,34(5):169-173.
[5]蒋玮,陈武,胡仁杰.基于超级电容器储能的微网统一电能质量调节器[J].电力自动化设备,2014,34(1):85-90.
[6]WANG H,LI Q N,WU M L.Investigation on a new algorithm for instantaneous reactive and harmonic currents detection applied to intensive nonlinear loads[J].IEEE transactions on power delivery,2007,22(4):2312-2318.
[7]CHANG Y P,LOW C.Optimization of a passive harmonic filter based on the neural-genetic algorithm with fuzzy logic for a steel manufacturing plant[J].Expert systems with applications,2008,34(3):2059-2070.
[8]熊杰锋,李群,袁晓冬,等.电力系统谐波和间谐波检测方法综述[J].电力系统自动化,2013,37(11):125-133.
[9]金维刚,刘会金.IEC标准框架下谐波和间谐波检测的最优化方法[J].电力系统自动化,2012,36(2):70-76.
[10]NING J X,WANG J H,GAO W Z,et al.A wavelet-based data compression technique for smart grid[J].IEEE transactions on smart grid,2011,2(1):212-218.
[11]贾毅婷,张东来,张斌.基于小波尺度相关性的暂态数据降噪压缩方法[J].电力系统自动化,2013,37(5):68-73.
[12]NASSIF A B,JING Y,MAZIN H,et al.An impedancebased approach for identifying interharmonic sources[J].IEEE transactions on power delivery,2011,26(1):333-340.
[13]雷何,高山,林新春,等.基于包含谐波模型的加权最小二乘估计算法的电压暂降检测方法[J].电力自动化设备,2013,33(9):36-41.