一种基于傅里叶变换的快速频率测量算法

Rapid frequency measurement algorithm based on fourier transform

频率测量是电能质量测量的重要基础,传统频率测量算法是使用傅里叶变换,很难保证系统的测量精度和实时性要求,需要对傅里叶算法进行改进。文中介绍了一种基于傅里叶变换的频率偏差的精确测量算法,并提出了一种新型的频率偏差符号判断算法。该算法大大简化了判断逻辑,减少了计算时间,提高了算法的实时性,经过MATLAB仿真,精度也较好。

Frequency measurement is an important basis for power quality measurements. The traditional method is used to measure the frequency of the Fourier transform. It is difficult to ensure accuracy of the system and real-time requirements, So it is necessary to improved Fourier algorithm. This paper introduces a precise measurement of algorithm for frequency deviation based on Fourier transform,and puts forward a new type of frequency deviation symbol judgment algorithm. This algorithm greatly simplifies the logical judgment,reduces the calculation time and improves the real-time property of the algorithm. And the algorithm is simulated on the MATLAB,found with high precision.