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低频振荡模态参数辨识的共振稀疏分解SSI分析方法

电工技术学报(2016)

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Abstract
提出在色噪声背景下,采用共振稀疏分解的随机子空间法进行低频振荡模态参数的辨识,根据信号预知的共振属性实现复杂信号的分离。首先,对含高斯色噪声的低频振荡信号进行分解,得到高共振分量、低共振分量和余项三部分。低频振荡信号具有高共振属性,高共振分量即为提取的持续振荡的低频振荡信号,而高斯色噪声大部分存在于余项中。然后对高共振分量利用SSI进行参数辨识,得到较高参数的辨识准确度。仿真算例和实例说明了所提方法的有效性。
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Key words
Low-frequency oscillation,resonance-based sparse signal decomposition,tunable Q-factor wavelet transform,high-resonance component,low-resonance component,stochastic subspace identification
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