S变换在电力系统间谐波检测中的应用

间谐波是一种频率为基波非整数倍的特殊谐波,由于它在电力系统中大量存在,对电力系统造成极大影响与危害,所以对其进行分析和检测具有非常重要的意义.基于S变换的良好时频特性,提出了一种利用S变换检测间谐波的方法,通过Matlab分析S变换对典型信号的仿真并与小波变换进行比较,证明本方法的准确度、直观性更高.

Application of Detecting Power System Inter-Harmonics by S-Transform

Inter-harmonics is a kind of special harmonic in power system,whose frequency is non integer times of fundamental wave.It is abundant in the power grid,and can cause great harm to the grid.Therefore it has important significance to monitor and analyze the inter-harmonics.Based on the excellent frequency characteristics of S-transform,a frequency analysis harmonic detection method to use S-transform is proposed.By using S-transform on Matlab to simulate and analyze typical inter-harmonic signal and compare it with the wavelet-transform analysis,it is proved that S-transform has higher accuracy and intuition in detection of power system middle harmonic.