基于改进的能量算子的电压闪变参数估计
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摘要
电压闪变是电能质量的重要指标,而闪变测量需要提取闪变调幅波包络。提出了一种可以精确估计电压闪变调幅波的方法,使用Teager-Kaiser能量算子方法提取闪变包络,用改进的快速傅里叶变换(FFT)分析包络得到其相应的幅值、频率。考虑到FFT在非同步采样时的误差,选用旁瓣性能优良的Nuttall窗和精度较高的三谱线插值法改进FFT。给出了相应的算法公式步骤,并通过仿真试验证明所提方法的准确性和有效性。该方法计算量小,并具有较高精度,易于硬件实现。
Voltage flicker is an important index of power quality,and test flicker need to extract flicker amplitude modulator.Presents a precise method to estimate voltage flicker amplitude modulation wave,Teager-Kaiser energy operator method is used to extract the flicker envelope,then the corresponding amplitude and frequency are obtained by the improved fast Fourier transform.Considering the error of FFT under the asynchronous sampling conditions,The Nuttall window with excellent side-lobe performance and high accuracy of the triple-spectral-line interpolation algorithm are used to improve FFT.The algorithm formulas are proposed,and the simulation results prove the accuracy and effectiveness of the proposed method.The algorithm not only has a small amount of calculation,but it also has high precision,and easy for hardware implementation.
Voltage flicker is an important index of power quality,and test flicker need to extract flicker amplitude modulator.Presents a precise method to estimate voltage flicker amplitude modulation wave,Teager-Kaiser energy operator method is used to extract the flicker envelope,then the corresponding amplitude and frequency are obtained by the improved fast Fourier transform.Considering the error of FFT under the asynchronous sampling conditions,The Nuttall window with excellent side-lobe performance and high accuracy of the triple-spectral-line interpolation algorithm are used to improve FFT.The algorithm formulas are proposed,and the simulation results prove the accuracy and effectiveness of the proposed method.The algorithm not only has a small amount of calculation,but it also has high precision,and easy for hardware implementation.
引文
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[6]黄南天,袁翀,张卫辉,等.采用最优多分辨率快速S变换的电能质量分析[J].仪器仪表学报,2015,36(10):2174-2183.
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[11]李洪池,赵不贿.基于DSP的电压闪变监测系统设计与实现[J].低压电器,2010(19):34-37,49.
[12]魏晓璞,徐永海,郭春林,等.基于Hilbert变换与Pisarenko谐波分解的电压闪变参数估计[J].电力系统保护与控制,2010,38(6):26-29.
[13]刘稳坚,黄纯.经验模态分解及Hilbert谱分析在电压闪变检测中的应用[J].计算机测量与控制,2006,14(6):707-709,756.
[14]高云鹏,李峰,陈婧,等.基于Teager-Kaiser能量算子Rife-Vincent窗频谱校正的电压闪变测量[J].电工技术学报,2014,29(6):248-256.
[15]高云鹏,李峰,陈婧,等.改进能量算子Nuttall窗频谱校正的闪变测量方法[J].仪器仪表学报,2014,35(4):745-753.
[16]MARAGOS P,KAISER J F,QUATIERI T F.On amplitude and frequency demodulation using energy operators[J].IEEE Transactions on Signal Processing,1993,41(4):1532-1550.
[17]庞浩,李东霞,俎云霄,等.应用FFT进行电力系统谐波分析的改进算法[J].中国电机工程学报,2003,23(6):50-54.
[2]CHENG J Y,HSIEH C T,HUANG C M,et al.Application of modified Wigner distribution method to voltage flicker-generated signal studies[J].International Journal of Electrical Power&Energy Systems,2013,44(1):275-281.
[3]陈清,贾秀芳.基于Teager能量算子的闪变包络线提取[C].中国高等学校电力系统及其自动化专业第二十四届学术年会论文集.北京:中国农业大学,2008:2071-2074.
[4]HUANG S J,LU C W.Enhancement of digital equivalent voltage flicker measurement via continuous wavelet transform[J].IEEE Transactions on Power Delivery,2004,19(2):663-670.
[5]于静文,薛蕙,温渤婴.基于卡尔曼滤波的电能质量分析方法综述[J].电网技术,2010,34(2):99-103.
[6]黄南天,袁翀,张卫辉,等.采用最优多分辨率快速S变换的电能质量分析[J].仪器仪表学报,2015,36(10):2174-2183.
[7]FEILAT E A.Detection of voltage envelope using Prony analysis-Hilbert transform method[J].IEEE Transactions on Power Delivery,2006,21(4):2091-2093.
[8]薛凌云,黄伟,陈超.基于空间谱估计技术的间谐波小波检测算法[J].电子测量技术,2014,37(10):46-49.
[9]OLESKOVICZ M,COURY D V,FELHO O D,et al.Power quality analysis applying a hybrid methodology with wavelet transforms and neural networks[J].International Journal of Electrical Power&Energy Systems,2009,31(5):206-212.
[10]滕召胜,罗志坤,高云鹏,等.基于虚拟仪器的平方检测法电压闪变测量实现[J].仪器仪表学报,2011,32(8):1803-1809.
[11]李洪池,赵不贿.基于DSP的电压闪变监测系统设计与实现[J].低压电器,2010(19):34-37,49.
[12]魏晓璞,徐永海,郭春林,等.基于Hilbert变换与Pisarenko谐波分解的电压闪变参数估计[J].电力系统保护与控制,2010,38(6):26-29.
[13]刘稳坚,黄纯.经验模态分解及Hilbert谱分析在电压闪变检测中的应用[J].计算机测量与控制,2006,14(6):707-709,756.
[14]高云鹏,李峰,陈婧,等.基于Teager-Kaiser能量算子Rife-Vincent窗频谱校正的电压闪变测量[J].电工技术学报,2014,29(6):248-256.
[15]高云鹏,李峰,陈婧,等.改进能量算子Nuttall窗频谱校正的闪变测量方法[J].仪器仪表学报,2014,35(4):745-753.
[16]MARAGOS P,KAISER J F,QUATIERI T F.On amplitude and frequency demodulation using energy operators[J].IEEE Transactions on Signal Processing,1993,41(4):1532-1550.
[17]庞浩,李东霞,俎云霄,等.应用FFT进行电力系统谐波分析的改进算法[J].中国电机工程学报,2003,23(6):50-54.