基于相空间重构的暂态电能质量扰动检测方法

Transient Power Quality Disturbance Detection Method Based on Phase Space Reconstruction

将相空间重构方法应用到电能质量扰动分析中,对几类暂态电能质量扰动事件进行研究。采用互信息函数法确定最优时间延迟参数,将电能质量扰动时间序列映射到二维相空间中,并构造不同扰动信号的相轨迹。相轨迹可以分为正常基波和扰动两部分,据此通过对相轨迹中相点的筛选实现扰动部分的检测。仿真结果表明,该方法能够在含有一定噪声和谐波畸变的条件下,实现暂态电能质量扰动信号准确的检测。

Phase space reconstruction method is introduced to power quality research field to investigate the transient disturbances. The optimal delay is determined with mutual information function. Thus disturbance signals in time domain are mapped into 2-D phase plane. The phase trajectory of embedded signal in reconstruction phase space is divided into regular component and disturbance. The disturbance component is utilized to detect the occurrence of transient power quality signals. The simulation results show that the presented method can identify and locate transient power disturbances signals quickly and accurately from these sine signals which contain complex noise and harmonics.