一种基于傅氏算法的高精度测频方法  

A High-Accuracy Algorithm for Measuring Frequency of Power System Based on Fourier Filter

作　　者：李一泉[1] 何奔腾[1] 

机构地区：[1]浙江大学电气工程学院,浙江省杭州市310027

出　　处：《中国电机工程学报》2006年第2期78-81,共4页Proceedings of the CSEE

摘　　要：该文仔细研究了正弦信号经傅氏算法变换后的结果,发现随着数据窗的推移,傅氏算法得到的相量实部和虚部满足一个恒等式,由此得到一种新的测频方法。为了提高谐波情况下测频的精度,以前一次频率测量值为基础进行迭代,在对采样数据插值的基础上,使得迭代很快的收敛,仅需23ms左右的时间,即可准确求出基波频率。分别对原始信号为纯基波、存在谐波和噪声等情况进行了仿真,结果表明,算法在各种情况下都具有很高的计算精度。The information of the sine signal filtered by Fourier algorithm is studied and the conclusion is achieved that the real part and imaginary part of the phasor gained by Fourier algorithm satisfy an identical equation with the shifting of the data window. Hence, a new algorithm of frequency measurement comes into being. To improve the measurement accuracy of this algorithm with harmonics, iteration method is introduced based on the last calculated frequency, and interpolations are used to original samples for faster convergence speed by which we can accurately obtain fundamental frequency in 23ms.Finally, signals with harmonics and noises are simulated respectively, and the results show the high accuracy of this algorithm in all these situations.

关 键 词：电力系统 频率测量 傅氏算法 迭代 

分 类 号：TM761[电气工程—电力系统及自动化]