基于WPT和参数优化的VMD谐波检测方法

施瑶; 王雅静; 梅宇; 刘士绮

施瑶,王雅静,梅宇,刘士绮.基于WPT和参数优化的VMD谐波检测方法[J].电测与仪表,2022,59(8):166-171.
Shi Yao,Wang Yajing,Mei Yu,Liu Shiqi.VMD harmonic detection method based on WPT and mode decomposition number optimization[J].Electrical Measurement & Instrumentation,2022,59(8):166-171.

基于WPT和参数优化的VMD谐波检测方法

VMD harmonic detection method based on WPT and mode decomposition number optimization

DOI：10.19753/j.issn1001-1390.2002.08.023

中文关键词: 谐波检测变分模态分解小波包模态分解数参数优化

英文关键词:harmonic detection, VMD, WPT, MDN, parameter optimization

基金项目:山东省自然科学基金资助(ZR2016EEQ20)

作者中文名	作者英文名	单位
施瑶	Shi Yao	山东理工大学电气与电子工程学院
王雅静	Wang Yajing	山东理工大学电气与电子工程学院
梅宇	Mei Yu	山东理工大学电气与电子工程学院
刘士绮	Liu Shiqi	山东理工大学电气与电子工程学院

摘要点击次数: 946

中文摘要:

针对变分模态分解(Variational Mode Decomposition, VMD)在谐波检测中易受噪声影响、分解模态个数K难以确定的问题,提出一种基于小波包降噪(WPT)和参数优化的VMD谐波检测方法。首先,对谐波信号进行WPT降噪处理,然后对降噪后的信号进行VMD预分解,根据解析分量的瞬时频率均值选取最优的K值,最后对降噪信号进行最优K值VMD分解并提取频率,用希尔伯特变换进行幅值检测。仿真结果与对比表明,该方法能够有效的选择VMD分解模态个数,减小噪声影响,且具有良好的检测精度。

英文摘要:

For the variational mode decomposition (VMD) is susceptible to noise and the mode decomposition number (MDN) is difficult to be determined in harmonic detection, a VMD harmonic detection method based on Wavelet Packet Transform (WPT) denoising and MDN optimization is proposed. Firstly, WPT is used to reduce the noise of harmonic signal, then VMD is used to predecompose the denoised signal, and the optimal MDN is selected according to the instantaneous frequency mean of analytical component. Finally, VMD is used to decompose the denoised signal under the optimal NMD, and harmonic parameters are detected by the Hilbert transform. The simulation results show that method can effectively select MDN, reduce the impact of noise, and has good accuracy.

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