电压闪变调幅波提取方法的改进
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摘要
电压闪变是电能质量的重要指标之一,而闪变测量首先需要提取闪变调幅波。提出使用改进的TeagerKaiser能量算子方法提取闪变调幅波,该方法只需对检测信号的3个采样点进行简单的基本运算,使得提取闪变调幅波的过程快速、简洁。同时,为减少白噪声对算法检测精确度的影响,提出了改进的小波阈值去噪方法,对采集的电信号进行去噪,并通过仿真试验证明所提方法能够准确有效地检测电压闪变的调幅波。该方法克服噪声对电能质量检测的影响,并具有较高精度,易于实现。
Voltage flicker is one of theimportant indicators of power quality,and test flicker first need to extract flicker amplitude modulator.Presents an improved Teager-Kaiser energy operator method to estimate voltage flicker amplitude modulation wave,this method only needsthe three sampling points of the detection signal with simple basic operation,the process of the flicker amplitude wave extraction is fast and simple.Furthermore,to get accurate detection results under white noise,wavelet threshold denoising was applied,to eliminatethe noise ofelectrical signals.The simulation resultsprove the accuracy and validityof the proposed method.The algorithmcan overcome the influence of noise on power quality detection,has high precision,and easy to implement.
Voltage flicker is one of theimportant indicators of power quality,and test flicker first need to extract flicker amplitude modulator.Presents an improved Teager-Kaiser energy operator method to estimate voltage flicker amplitude modulation wave,this method only needsthe three sampling points of the detection signal with simple basic operation,the process of the flicker amplitude wave extraction is fast and simple.Furthermore,to get accurate detection results under white noise,wavelet threshold denoising was applied,to eliminatethe noise ofelectrical signals.The simulation resultsprove the accuracy and validityof the proposed method.The algorithmcan overcome the influence of noise on power quality detection,has high precision,and easy to implement.
引文
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[11]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.
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[14]DONOHOD L.De-noising by soft thresholding[J],IEEE Transactions on Information Theory,1995,1(3):613-627.
[15]张全明,刘会金,兰泉妮,等.基于小波混合阈值方法的电能质量信号去噪[J].电力自动化设备,2008,28(8):28-30,35.
[16]邬春明,谢妮娜.改进的小波阈值在电能质量信号去噪中的应用[J].计算机工程与应用,2012,48(3):114-116.
[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]贾秀芳,赵成勇,胥国毅,等.IEC闪变仪误差分析及改进设计[J].电工技术学报,2006,21(11):121-126.
[4]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.
[5]赵玉寿,刘惠康,吴玉辉.基于小波分析的电压闪变信号的提取[J].华东电力,2011(10):1643-1646.
[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]黄文清,戴瑜兴.基于Teager能量算子的电能质量扰动实时检测方法[J].电工技术学报,2007(6):154-158.
[9]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(下册).北京:中国农业大学,2008:2071-2074.
[10]郭继坤,马鹏飞,赵肖东.基于新阈值函数的小波阈值去噪算法及仿真[J].工业仪表与自动化装置,2015(1):117-121.
[11]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.
[12]MARAGOSP,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.
[13]钱苏敏,张琳絮,张云,等.基于小波阈值改进的去噪算法研究[J].国外电子测量技术,2012,31(5):49-51.
[14]DONOHOD L.De-noising by soft thresholding[J],IEEE Transactions on Information Theory,1995,1(3):613-627.
[15]张全明,刘会金,兰泉妮,等.基于小波混合阈值方法的电能质量信号去噪[J].电力自动化设备,2008,28(8):28-30,35.
[16]邬春明,谢妮娜.改进的小波阈值在电能质量信号去噪中的应用[J].计算机工程与应用,2012,48(3):114-116.