针对含噪暂态电能质量扰动信号的检测方法研究

Research on detection method of noisy transient power quality disturbance signal

针对如今如何准确的检测含噪信号暂态电能质量扰动位置的问题,在传统的希尔伯特变换的基础上,本文提出将小波变换与EEMD希尔伯特变换相结合的方法。首先通过小波变换对含噪声波形进行去噪,然后通过EEMD希尔伯特变换,进而得到精确的扰动起止时刻。在MATLAB平台上应用该方法对含有噪声信号的电压骤升、电压骤降、瞬时脉冲三种扰动信号进行仿真分析,仿真结果表示,该方法更加准确的检测扰动位置,误差更小。

In view of the problem of how to accurately detect the transient power quality disturbance of the noise signal,this paper proposes a method combining wavelet transform with EEMD Hilbert transform,based on the traditional Hilbert transform.Firstly,wavelet transform is used to denoise the noise waveform,and then the EEMD Hilbert transform is used to get the accurate disturbance starting and stop time.In the MATLAB platform,using the method of containing the signal to noise voltage swells,voltage sags,instantaneous pulse three disturbance signal analysis and simulation,and the simulation results indicate that,the method is more accurate detection of position disturbance,and less error.