基于快速傅立叶变换的电力谐波分析与程序实现

Power harmonic analysis and program implementation based on FFT

采用FFT(快速傅立叶变换)算法在电网中进行应用,方法简单、可靠、精度较高,可以对谐波进行准确分析.利用FFT算法编写谐波分析程序对三相电进行数据采样,采样频率为3 200 Hz,将采样到的数据进行FFT变换.利用FFT的结果求出对应点的幅值,计算基波的频率、幅度,及其有效值;对其他频率的幅值可通过阈值进行判断,超过阈值可认为是谐波信号,并提取其幅值、频率;最后利用提取出来基波和谐波的信息计算谐波次数和谐波的有效值、谐波畸变率等参数.

It is simple,reliable and accurate to apply FFT algorithm in a network and an accurate analysis of harmonics can be done.The paper uses FFT algorithm to compile harmonic analysis procedure to conduct data sampling on a three wire electricity,and the sampling frequency is 3200Hz.The sampling data are changed with FFT.KIPPO frequency,amplitude,and the valid values are to be calculated with the help of the results of the corresponding order;other frequency will be the result of the data sampling value judgment,and a harmonic signal is over the threshold,and its value and frequency are extracted;finally the calculations of the harmonic and harmonics valid values,and harmonic distortion rate for parameters are done by using the extracted information and harmonics.