STFT和S变换在含噪声电压谐波检测中的应用  

Application in Noise Signal Detection Based on STFT and S Transform

作　　者：徐健[1] 宋双双[1] 

机构地区：[1]西安工程大学电信学院,陕西西安710048

出　　处：《自动化技术与应用》2015年第12期85-89,共5页Techniques of Automation and Applications

基　　金：PCI数据采集的电能质量监测和评估系统研究(2013JK1015)

摘　　要：针对电力系统中经常出现的噪声信号,本文提出了短时傅里叶变换和S变换的基本原理,对含有噪声的电压谐波信号进行了傅里叶变换和S变换的MATLAB仿真。用5%的布莱克曼窗对原始信号截取,三次多项式对原始信号进行了拟合,并用三次方根值对S变换的模矩阵进行改进计算,得到了谐波信号的参数指标。仿真结果证明,改进后的S变换克服了短时傅里叶变换的缺点,减少了频谱泄漏,为谐波检测中提供了一种有效的检测方法。For noise signal that often occurs in the power system, this paper proposes an algorithm based on S transform matrix, introduces the basic principle of short-time Fourier transform and S transform., and MATLAB simulation. This research uses %5 blackman window, cubic polynomial to fit the original signal and three root value of S transform matrix to improve the calculated accuracy and gets the parameters of the noise signal.The simulation results show that the improved S transform overcomes the disadvantage of short time Fourier, more effectively reduces the spectrum leakage. It provides an effective detection method in the noise detection.

关 键 词：噪声 短时傅里叶变换 S变换 MATLAB 频谱泄漏 电力系统 

分 类 号：TP216[自动化与计算机技术—检测技术与自动化装置]