基于傅氏滤波的频率测量新方法  

New Algorithm for Measuring Frequency of Power System Based on Fourier Filter

作　　者：李一泉[1] 何奔腾[2] 

机构地区：[1]广东省电力调度中心,广州510600 [2]浙江大学电气工程学院,杭州310027

出　　处：《电力系统及其自动化学报》2006年第4期45-48,共4页Proceedings of the CSU-EPSA

摘　　要：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的实部和虚部满足一个恒等式,由此得到一种新的测频方法,只需20 m s左右的时间,即可准确求出基波频率。最后分别对原始信号纯基波、存在谐波及频率变化的情况进行了仿真。仿真结果表明,该算法在各种情况下都具有较高的计算精度。Focusing on the information of sine signals processed by Fourier algorithm, it is detected that with the shifting of the data window the real part and imaginary part of the phasor gained from Fourier algorithm satisfy an identical equation. Thereby a new method of frequency measurement is proposed, by which we can accurately obtain fundamental frequency in about 20ms. In the end, signals with changing frequency, with and without harmonics are tested respectively, and the results prove a higher accuracy of the algorithm in all situations.

关 键 词：傅氏算法 测频 谐波 

分 类 号：TM935[电气工程—电力电子与电力传动]