滑动去趋势波动分析在电能质量暂态扰动检测中的应用

Application of Sliding Detrended Fluctuation Analysis in Detection of Transient Power Quality Disturbances

针对电能质量暂态扰动信号的不规则性和突变性特点,提出了一种基于滑动去趋势波动分析的电能质量扰动检测新方法。扰动的发生使原信号的相关性特征发生变化,而去趋势波动分析的波动参数对这种变化反应敏感。通过滑动窗构建波动参数曲线,不仅能够对扰动时刻进行准确定位,而且可以确定电压暂升、暂降等典型暂态扰动的电压波动幅值。试验结果证明了该方法的有效性,与基于小波变换的检测方法相比,所述方法在抵御噪声干扰方面更具优越性。

In view of the irregularity and mutability of power quality transient disturbance signals, a new method for detecting the transient power quality disturbances based on sliding detrended fluctuation analysis is introduced. The correlated properties of the original signals change when a transient disturbances occurs, analysis are sensitive to them. Fluctuating parameter curves can be disturbance moment and determine the typical voltage fluctuation results show that the method is effective, and has better immunity and the fluctuating parameters of the detrended fluctuation constructed according to sliding windows. It can detect the amplitudes such as voltage swell and sag. Experimental to noise than the method based on wavelet transform.