基于二进小波变换的电能质量扰动检测

电能质量扰动起止时刻和持续时间是描述扰动的重要属性,为了对电能质量进行分析与评估,需要对其进行检测。小波变换的局部模极大值对应信号的突变点,可以用来检测电能质量扰动。连续小波变换的计算量大,存在较大冗余,而多分辨率分析的方法由于进行了二抽取,难以直接根据变换结果进行检测,需要重构信号,因此,采用了二进小波变换对电能质量扰动进行检测。使用电磁暂态分析程序ATP仿真软件对电能质量扰动信号进行了仿真,用样条小波进行二进小波变换,检测结果表明在分解尺度一上可以实现较为准确的检测。

Detection of Power Quality Disturbance Based on Binary Wavelet Transform

In order to analyze and evaluate power quality,it is necessary to detect the begin-end time and continuance time of power quality disturbance which are considered as important properties for describing the disturbance.Because of the heavy redundancy in calculation and the difficuly in disturbance detection which need dual sample and reconstructed signals,binary wavelet transform is adopted to detect power quality based on wavelet transform local modulus maximum theory,which corresponds to the singular point of power quality disturbance signal and can be used in disturbance detection.Simulation of power quality disturbance signal is given by alternative transient program(ATP),and the spline wavelet is adopted to make binary wavelet transform.Detection results indicate that relative exact detection can be acquired at decomposition scale one.