基于耦合Duffing振子的局部放电信号去噪方法研究

Research on Partial Discharge Signal Denoising Method Based on Coupled Duffing Oscillator

局部放电信号在检测前需去除其噪声,且为了进一步识别局放信号的模式,去噪时还应尽可能保留其波形特征。所以噪声抑制能力和波形恢复能力是局放信号去噪的两个关键指标。提出了一种适用于局部放电信号去噪的由三个Duffing振子构成的耦合同步系统,该系统具有耦合程度高、同步速度快的特点。仿真实验表明,该Duffing振子系统可以适应各种类型信号的去噪。应用到局放信号去噪时,该系统可以在-25 dB的信噪比下恢复局放信号,且信号的关键波形细节还原较好。此外,该系统的求解速度很快,可以应用于局放信号的实时处理。

The mixed noise should be removed before partial discharge signal detection,and in order to further identify the pattern of partial discharge signal,the waveform characteristics should be retained as much as possible.So the ability of noise suppression and waveform recovery are the two key indexes of partial discharge signal denoising.A coupled synchronization system composed of three Duffing oscillators for partial discharge signal denoising is proposed.The system has the characteristics of high coupling degree and high synchronization speed.The simulation results show that the Duffing oscillators system can adapt to all kinds of signal denoising.When applied to the partial discharge signal denoising,the system can recover the partial discharge signal at-25 dB SNR,and the key waveform details of signal can be restored well.In addition,the solution speed of the system is very fast,which can be applied to the real-time processing of partial discharge signal.