基于递推FFT算法与不间断采样的电力谐波分析

POWER HARMONIC ANALYSIS BASED ON RECURSIVE FFT ALGORITHM AND CONTINUOUS SAMPLING

提出了递推FFT算法,对标准FFT算法结构进行了改进,使其运算由集中变为不等量地分配在采样间隔内进行,在采样频率较高、采样窗口较长的情况下,仍可实现对被测信号的不间断采样与FFT分析。采用PLL(锁相环)来实现采样窗口与被测信号周期的同步。采用高速DSPTMS320C32-60执行递推FFT算法,得出了实际运行时间的结果,为被测信号不间断采样分析的实现提供了应用依据。

This article puts forward recursive FFT algorithm,which improve the structure of normal FFT algorithm,and change concentrated operation into unequally operation among gaps of sampling points.When sampling frequency is comparatively high and sampling windows are relatively long,it can implement continuous sampling of measured signal and continuous FFT analysis.The method uses hardware PLL(Phase-Locked Loop)to synchronize the sampling window and the measured signal cycle exactly.It is based on high-speed DSP(Digital Signal Processor)TMS320C32-60in order to implement recursive FFT algorithm,then give the results,which shows the possibility to realize the continuous sampling of signals.