基于改进S变换的电压骤降自适应检测方法
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摘要
由于传统S变换(S-Transform,ST)在检测电压骤降问题时存在时频分辨率不高,计算量大的问题,深入研究传统S变换(Modified S-Transform,MST),给出了一种基于改进S变换的电压骤降自适应检测方法,可以准确、快速地实现电压骤降参数的准确提取。首先给出MST中调节因子的取值依据,并用实验分析法给出调节因子的取值范围;而后依据调节因子的取值分布情况,提出分段的调节因子;最后基于调节因子取值函数,建立自适应检测方法。在MATLAB上对算法进行仿真,能够准确的检测出电压骤降参数,且抑制噪声和谐波影响的效果好。实际构建的硬件测试平台验证了该算法的正确性和可行性。
Since the low time-frequency resolation and heavy computation of S-transform when comes to detecting voltage sags,the adaptive detection method based on modified S-transform( MST) algorithm was established in this paper. Voltage sag parameters are obtained with MST in a higher resolation and speed. Firstly,the standard of adjusting factors in MST is given,and the values of adjusting factors are given by experimental analysis. Secondly,according to the distribution of the adjustment factor,the adjusting factor of piecewise is proposed. Finally,the adaptive detection method is established based on the function of adjusting factor. The simulation and test results show that the proposed method provides results with higher accuracy in time-frequency analysis,and is appropriate for accurate and rapid detection of voltage sags.
Since the low time-frequency resolation and heavy computation of S-transform when comes to detecting voltage sags,the adaptive detection method based on modified S-transform( MST) algorithm was established in this paper. Voltage sag parameters are obtained with MST in a higher resolation and speed. Firstly,the standard of adjusting factors in MST is given,and the values of adjusting factors are given by experimental analysis. Secondly,according to the distribution of the adjustment factor,the adjusting factor of piecewise is proposed. Finally,the adaptive detection method is established based on the function of adjusting factor. The simulation and test results show that the proposed method provides results with higher accuracy in time-frequency analysis,and is appropriate for accurate and rapid detection of voltage sags.
引文
[1]Fuchs E,Masoum M A S.Power Quality in Power Systems and Electrical Machines(Second Edition)[M].2015.
[2]许文远,雍静.电力扰动数据分析学---电能质量监测数据的新应用[J].中国电机工程学报,2013,33(19):93-101.Xu Wenyuan,Yong Jing.Power disturbance data analytics:New application of power quality monitoring data[J].Proceedings of the CSEE,2013,33(19):93-101.
[3]Bollen M.Understanding Power Quality Problems:Voltage Sags and Interruptions[M].Wiley-IEEE Press,2000.
[4]Moschitta A,Carbone P,Muscas C.Generalized Likelihood Ratio Test for Voltage Dip Detection[J].Instrumentation&Measurement IEEETransactions on,2010,60(5):1644-1653.
[5]卿柏元,滕召胜,高云鹏,等.基于Nuttal窗双谱线插值FFT的电力谐波分析方法[J].中国电机工程学报,2008,28(25):153-158.Qing Baiyuan,Teng Zhaosheng,Gao Yunpeng,et al.An Approach for Electrival Harmonic Analysis Based on Nuttall Window Double-spectrum-line Interpolation FFT[J].Proceedings of the CSEE,2008,28(25):153-158.
[6]赵凤展,杨仁刚.基于短时傅里叶变换的电压暂降扰动检测[J].中国电机工程学报,2007,27(10):28-34.Zhao Fengzhan,Yang Rengang.Voltage Sag Disturbance Detection Based on Short Time Fourier Transfor[J].Proceedings of the CSEE,2007,27(10):28-34.
[7]王克星,宋政湘,陈德桂,等.基于小波变换的配电网电压暂降的干扰源辨识[J].中国电机工程学报,2003,23(6):29-34.Wang Kexing,Song Zhengxiang,Chen Degui,et al.Interference source Identification of Voltage Sage in Distribution System Based on Wavelet Transform[J].Proceedings of the CSEE,2003,23(6):29-32.
[8]肖湘宁,徐永海,刘连光.考虑相位跳变的电压凹陷动态补偿控制器研究[J].中国电机工程学报,2002,22(1):64-69.Xiao Xiangning,Xu Yonghai,Liu Lianguang.Research on mitigation methods of voltage sag with phase angle jump[J].Proceedings of the CSEE,2002,22(1):64-69.
[9]杨洪耕,刘守亮,肖先勇,等.基于S变换的电压凹陷分类专家系统[J].中国电机工程学报,2007,27(1):98-103.Yang Honggeng,Liu Shouliang,Xiao Xianyong,et al.S-transformbased Expert System of Classification of Voltage Dips[J].Proceedings of the CSEE,2007,27(1):98-103.
[10]易吉良,彭建春,谭会生.采用不完全S变换的电能质量扰动检测方法[J].高压电技术,2009,35(10):2562-2567.
[11]R.G.Stockwell,L.Mansinha,R.P.Lowe.Localization of the Complex Spectrum:The STransform[J].IEEE Transactions on Signal Processing,1996,44(4):998-1001.
[12]吴禹,唐求,滕召胜,等.基于改进S变换的电能质量扰动信号特征提取方法[J].中国电机工程学报,2016,36(10):2682-2689.Wu Yu,Tang Qiu,Teng Zhaosheng,et al.Feature Extracation Method of Power Quality Disturblance SignalsBased on Modified S-Transform[J].Proceedings of the CSEE,2016,36(10):2682-2689.
[13]唐求,滕召胜,郭斯羽.基于广义S变换的电压骤降特征量检测方法[J].电子测量与仪器学报,2012,26(2):113-119.
[14]GB/T 30137-2013,电能质量电压暂降与短时中断[S].
[2]许文远,雍静.电力扰动数据分析学---电能质量监测数据的新应用[J].中国电机工程学报,2013,33(19):93-101.Xu Wenyuan,Yong Jing.Power disturbance data analytics:New application of power quality monitoring data[J].Proceedings of the CSEE,2013,33(19):93-101.
[3]Bollen M.Understanding Power Quality Problems:Voltage Sags and Interruptions[M].Wiley-IEEE Press,2000.
[4]Moschitta A,Carbone P,Muscas C.Generalized Likelihood Ratio Test for Voltage Dip Detection[J].Instrumentation&Measurement IEEETransactions on,2010,60(5):1644-1653.
[5]卿柏元,滕召胜,高云鹏,等.基于Nuttal窗双谱线插值FFT的电力谐波分析方法[J].中国电机工程学报,2008,28(25):153-158.Qing Baiyuan,Teng Zhaosheng,Gao Yunpeng,et al.An Approach for Electrival Harmonic Analysis Based on Nuttall Window Double-spectrum-line Interpolation FFT[J].Proceedings of the CSEE,2008,28(25):153-158.
[6]赵凤展,杨仁刚.基于短时傅里叶变换的电压暂降扰动检测[J].中国电机工程学报,2007,27(10):28-34.Zhao Fengzhan,Yang Rengang.Voltage Sag Disturbance Detection Based on Short Time Fourier Transfor[J].Proceedings of the CSEE,2007,27(10):28-34.
[7]王克星,宋政湘,陈德桂,等.基于小波变换的配电网电压暂降的干扰源辨识[J].中国电机工程学报,2003,23(6):29-34.Wang Kexing,Song Zhengxiang,Chen Degui,et al.Interference source Identification of Voltage Sage in Distribution System Based on Wavelet Transform[J].Proceedings of the CSEE,2003,23(6):29-32.
[8]肖湘宁,徐永海,刘连光.考虑相位跳变的电压凹陷动态补偿控制器研究[J].中国电机工程学报,2002,22(1):64-69.Xiao Xiangning,Xu Yonghai,Liu Lianguang.Research on mitigation methods of voltage sag with phase angle jump[J].Proceedings of the CSEE,2002,22(1):64-69.
[9]杨洪耕,刘守亮,肖先勇,等.基于S变换的电压凹陷分类专家系统[J].中国电机工程学报,2007,27(1):98-103.Yang Honggeng,Liu Shouliang,Xiao Xianyong,et al.S-transformbased Expert System of Classification of Voltage Dips[J].Proceedings of the CSEE,2007,27(1):98-103.
[10]易吉良,彭建春,谭会生.采用不完全S变换的电能质量扰动检测方法[J].高压电技术,2009,35(10):2562-2567.
[11]R.G.Stockwell,L.Mansinha,R.P.Lowe.Localization of the Complex Spectrum:The STransform[J].IEEE Transactions on Signal Processing,1996,44(4):998-1001.
[12]吴禹,唐求,滕召胜,等.基于改进S变换的电能质量扰动信号特征提取方法[J].中国电机工程学报,2016,36(10):2682-2689.Wu Yu,Tang Qiu,Teng Zhaosheng,et al.Feature Extracation Method of Power Quality Disturblance SignalsBased on Modified S-Transform[J].Proceedings of the CSEE,2016,36(10):2682-2689.
[13]唐求,滕召胜,郭斯羽.基于广义S变换的电压骤降特征量检测方法[J].电子测量与仪器学报,2012,26(2):113-119.
[14]GB/T 30137-2013,电能质量电压暂降与短时中断[S].