基于EMD和TEO的电力系统短期扰动检测新方法

借鉴经验模态分解EMD(Emp iricalMode Decomposition)的思想提出一种电力系统短期扰动检测定位的新方法,该方法通过一个对称三角模态来保留信号的扰动信息进而定位扰动。同时,在扰动准确定位的基础上,提出对原信号进行分段EMD,并采用Teager能量算子求取幅值包络来识别扰动类型的分析方法。该方法能够克服EMD过程产生的模态混叠导致检测失效的问题,与H ilbert-Huang变换方法和小波检测方法相比,所提方法能够更加简单快速地实现对扰动的检测。仿真结果表明了该方法的有效性。

A new method based on empirical mode decomposition and teager energy operator for detection of short-term power system disturbance

A new method based on the idea of EMD(Empirical Mode Decomposition) for the detection and localization of short-term power system disturbance is presented.This method reserves the disturbance information of signals through a symmetrical triangle mode to localize disturbance.Based on exact localization of disturbance,a method which uses piecewise EMD to the original single and employs Teager energy operator to obtain amplitude envelope for identifying the type of disturbance is presented.This method can solve the problem of invalid detection of disturbance due to the modes mixing brought by empirical mode decomposition.Compared with Hilbert-Huang transform or wavelet detection method,the proposed method can make exact detection of disturbance simpler and quicker.Simulation results have proved the effectiveness of the proposed method.