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有效去除继电保护信息采集中的噪声,对确保继电保护装置正确动作至关重要。对电力系统接地短路电流信号的去噪进行了研究,针对小波去噪等信号处理方法中存在的Gibbs现象,提出并研究了采用db4小波进行信号去噪,采用平移不变小波变换,并以新型阈值代替传统阈值,进一步改善了去噪效果。工程实际应用中,采用间隔循环平移可提高运算速度,理论分析及仿真实验均验证了该方法的有效性。
Effectively remove the noise in the relay information acquisition is essential to ensure the correct operation of the relay protection device. Aiming at the Gibbs phenomenon existing in signal processing methods such as wavelet denoising, this paper proposes and studies the signal denoising using db4 wavelet, adopts the invariant wavelet transform of translation, Threshold instead of the traditional threshold, to further improve the denoising effect. In engineering practice, the use of interval cyclic shift can improve the speed of operation, theoretical analysis and simulation experiments verify the effectiveness of the method.