基于加窗FFT与小波包变换融合的矿井谐波检测法

摘要

针对目前谐波检测方法存在频谱泄露、栅栏现象、运算量大、实时性差等缺点,提出基于加窗快速傅里叶变换与小波包变换融合的检测方法,利用加窗快速傅里叶变换优秀的幅频特性,精确检测出谐波成分,并结合小波包变换良好的时频特性,快速且有选择地提取出所需检测的谐波分量.根据矿井供电系统的用电设备产生的谐波特点,构建模型,采用Matlab软件进行仿真.结果表明,该方法实用有效,实时性强.%In order to overcome the shortcomings of current harmonic detection methods such as spectrum leakage,fence phenomenon,large amount of computation and poor real-time performance,a harmonic detection method based on windowed fast Fourier transform and wavelet packet transform is proposed,which uses the excellent amplitude-frequency characteristics of the windowed Fourier transform to accurately detect the harmonic components and combines the good time-frequency characteristic of wavelet packet transform to quickly and selectively extract the harmonic component of the detected signal.According to the harmonic characteristcs generated by the electricity equipment in the mine power supply system,the model was built,and Matlab software was used for simulation.The results show that the method is effective and real-time.