希尔伯特-黄变换在电压闪变测量中的应用
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摘要
电压闪变是影响电能质量的一个重要因素,针对闪变水平的计算问题,将希尔伯特-黄变换(HHT)应用于电压波动信号的时变分析中。首先,对提取的电压包络信号进行了HHT变换,从而获得了波动电压的时变参数;然后,将瞬时幅值按照"频率—电压波动"曲线进行加权,得到了瞬时闪变视感度;最后,通过统计计算,得出了短时闪变严重度。对新算法进行了仿真,以含有10 Hz与20Hz闪变成分的电压信号为例,每0.01 s可输出一个闪变值,实例的统计结果与理论结果误差仅为3.863%,符合IEC的要求。研究结果表明,该算法与IEC法、FFT法相比,具有多分辨率的特点,可用于获取电压幅值、频率的瞬时信息,提供更及时有效的瞬时闪变值;另外该算法还能够适用于非平稳信号的闪变测量。
Voltage flicker is one of the most important factors of electric power quality.Aiming to calculate flicker level,the application of Hilbert-Huang transform(HHT)to voltage fluctuation testing was investigated.HHT was applied to voltage envelope to get time-varying information.Then instantaneous flicker sensation was derived from product of instantaneous voltage amplitude and its weighting coefficient in corresponding frequency.The short-time flicker severity was obtained after statistical analysis.A simulation was made to analyze voltage signal with 10 Hz and 20 Hz.100 flicker outputs can be obtained per second.After statistical analysis,the error between experimental result and theoretical result is only 3.863%,which can meet the requirement of IEC.The result indicates that,compared with other approaches such as method based on IEC and FFT,HHT is more capable in processing non-stationary signal,and can provide quick and effective results while presenting real-time information of voltage and frequency.
Voltage flicker is one of the most important factors of electric power quality.Aiming to calculate flicker level,the application of Hilbert-Huang transform(HHT)to voltage fluctuation testing was investigated.HHT was applied to voltage envelope to get time-varying information.Then instantaneous flicker sensation was derived from product of instantaneous voltage amplitude and its weighting coefficient in corresponding frequency.The short-time flicker severity was obtained after statistical analysis.A simulation was made to analyze voltage signal with 10 Hz and 20 Hz.100 flicker outputs can be obtained per second.After statistical analysis,the error between experimental result and theoretical result is only 3.863%,which can meet the requirement of IEC.The result indicates that,compared with other approaches such as method based on IEC and FFT,HHT is more capable in processing non-stationary signal,and can provide quick and effective results while presenting real-time information of voltage and frequency.
引文
[1]肖湘宁.电能质量分析与控制[M].北京:中国电力出版社,2010.
[2]贾秀芳,赵成勇,胥国毅,等.IEC闪变仪误差分析及改进[J].电工技术学报,2006,21(11):121-126.
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[5]HUANG N E,SHEN Zheng,LONG S R,et al.The empiri cal mode decomposition and the Hilbert spectrum for non linear and non-stationary time series analysis[C].Proc.R.Soc.Lond,1998:903-995.
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[7]宋倩倩,于凤芹.基于Hilbert-Huang变换和听觉掩蔽的语音增强法[J].声学技术,2009,28(3):280-283.
[8]李天云,赵妍,韩永强,等.Hilbert-Huang变换方法在谐波和电压闪变检测中的应用[J].电网技术,2005,29(2):39-43.
[9]伍青安,袁越,吴博文,等.基于Hilbert-Huang变换的风电场闪变[J].电网与清洁能源,2011,27(4):73-77.
[10]段生全.高精度时频分析及应用[D].成都:成都理工大学信息工程学院,2005:15-50.
[11]MAREIM I,TAREK K.Abdel-Galil,Ehab F.EI-Saadany,et al.Hilbert Transform based control Algorithm of the DG Interface for voltage flicker mitigation[J].IEEE Transac tions on Power Delivery,2005,20(2):1129-1133.
[12]粟时平,刘桂英.现代电能质量检测技术[M].北京:中国电力出版社,2008.
[13]周文,毛志芳,毛志强.电压闪变算法的MATLAB仿真及DSP实现[C].中国国际供电会议,2008.
[14]国家标准化管理委员会.GB/T12326-2008电能质量电压波动与闪变[S].北京:中国标准出版社,2009.
[15]盖强,张海勇,徐晓刚.Hilbert-Huang变换的自适应频率多分辨率分析研究[J].电子学报,2005,33(3):563-566.
[2]贾秀芳,赵成勇,胥国毅,等.IEC闪变仪误差分析及改进[J].电工技术学报,2006,21(11):121-126.
[3]冯亮,张有兵,翁国庆,等.基于TMS320C6713DSP的IEC电压闪变仪[J].机电工程,2011,28(9):1144-1148.
[4]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.
[5]HUANG N E,SHEN Zheng,LONG S R,et al.The empiri cal mode decomposition and the Hilbert spectrum for non linear and non-stationary time series analysis[C].Proc.R.Soc.Lond,1998:903-995.
[6]张义平,李夕兵,赵国彦.基于HHT方法的爆破地震信号分析[J].工程爆破,2005,11(1):1-7.
[7]宋倩倩,于凤芹.基于Hilbert-Huang变换和听觉掩蔽的语音增强法[J].声学技术,2009,28(3):280-283.
[8]李天云,赵妍,韩永强,等.Hilbert-Huang变换方法在谐波和电压闪变检测中的应用[J].电网技术,2005,29(2):39-43.
[9]伍青安,袁越,吴博文,等.基于Hilbert-Huang变换的风电场闪变[J].电网与清洁能源,2011,27(4):73-77.
[10]段生全.高精度时频分析及应用[D].成都:成都理工大学信息工程学院,2005:15-50.
[11]MAREIM I,TAREK K.Abdel-Galil,Ehab F.EI-Saadany,et al.Hilbert Transform based control Algorithm of the DG Interface for voltage flicker mitigation[J].IEEE Transac tions on Power Delivery,2005,20(2):1129-1133.
[12]粟时平,刘桂英.现代电能质量检测技术[M].北京:中国电力出版社,2008.
[13]周文,毛志芳,毛志强.电压闪变算法的MATLAB仿真及DSP实现[C].中国国际供电会议,2008.
[14]国家标准化管理委员会.GB/T12326-2008电能质量电压波动与闪变[S].北京:中国标准出版社,2009.
[15]盖强,张海勇,徐晓刚.Hilbert-Huang变换的自适应频率多分辨率分析研究[J].电子学报,2005,33(3):563-566.
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