基于DUFFING阵子的接地网故障诊断弱信号幅值检测新方法

A novel approach of low signal detection based duffing for grounding grids corrosion diagnosis

为检测接地网故障诊断中的微弱信号,本文基于混沌Duffing振子和改进型FFT算法,提出了一种可用于接地网故障诊断中微弱信号幅值测量的新方法。首先将含噪声的待测信号加入Duffing系统,依据大周期工作状态下Duffing系统具有优良的噪声免疫特性,在此基础上采用改进的FFT算法计算Duffing系统的输出信号幅值,然后根据系统输入输出之间的关系确定微弱方波(输入信号)的幅值。通过仿真实验,对该方法的测量误差进行了分析。实验结果表明:该方法明显提高了测量精度。

To benefit improving the accuracy of the corrosion diagnosis for grounding grids, based on The Duffing chaotic oscillator and improved FFT algorithm, a novel approach of estimating the amplitude of weak signal is put forward. The theory and implementation procedure are described. First, the signal embedded with noise is put into the Duffing chaotic oscillator system, which has a characteristic of high signal-to-noise-ratio （SNR） in great period state, the FFT method is adopted to estimate the amplitude value of output signal, and the amplitude can be obtained by the relationship between the input and output of system. With the simulation experiment, we analyzed the error of measurement. The result shows that the approach proposed has a high accuracy in measurement.