二进时间窗FFT谐波检测

电力系统中存在着各种频率的谐波,有工频整数倍的普通谐波,也有非工频整数倍的间谐波,要把电力系统中所有的谐波分量准确地测量出来有一定的困难,为提高谐波分析精度的同时提高谐波最小分辨率,基于传统的FFT谐波分析法,提出二进时间窗的FFT谐波检测算法,该方法充分考虑了计算时间及计算精度。实验结果表明,该方法可以在不明显增加硬件水平的条件下用最短的时间进行分析计算,即能保证谐波测量的精度,又能提高谐波测量的分辨率,对抑制电力系统中日益复杂严重的谐波污染,有一定的推广价值。

Binary scale time windows FFT for harmonic analysis

Various harmonics exist in the electrical power system.The harmonics include both integer harmonics and non-integer harmonics. It is hard to analyze all the harmonics accurately.In order to improve the precision of harmonic analysis,this paper presents a new algorithm after binary scale time windows FFT based on traditional algorithm.This algorithm considers the calculative time and precision well.The results of the test indicate that this algorithm can guarantee the accuracy and raise the resolving power in the harmonic analysis without increasing the hardware level and the time of calculation obviously.It can reduce the increasingly serious harmonic pollution in power system effectively.