基于快速傅里叶变换的电力系统频率实时计算方法  

New On-line Frequency Calculation Method Based on FFT

作　　者：王天健[1] 吴振升[1] 王晖[1] 刘栋[1] 

机构地区：[1]北京交通大学电气学院,北京100044

出　　处：《郑州大学学报（工学版）》2011年第3期81-84,共4页Journal of Zhengzhou University（Engineering Science）

摘　　要：提出了一种利用快速傅里叶变换及虚拟仪器LabVIEW平台编程处理的电力系统实时频率跟踪测算方法,采用快速傅里叶变换方法避免了计算过程中电压分母过零点以及非整周期采样造成的影响.理论分析及数字仿真实验表明,该算法实现简单易行,处理速度快,有很高的计算精度,对噪声和谐波也有一定的抑制能力,能满足电力系统实时频率估算的要求.This paper presents a method to monitor the frequency of electric system which is based on fast Fourier transform.Using fast Fourier transform can avoid the influence factor caused by denominator voltage crossing-zero point of denominator and un-whole cycle sampling.Theoretical analysis and simulation demonstrates that this method is easy to implement,and has the advantage of high processing rate,and high precision.It can also decrease the errors introduced by noise and harmonic.This method can meet the requirements of on-line frequency estimation.

关 键 词：快速傅里叶变换 窗函数 虚拟仪器 电力系统 频率 

分 类 号：TM76[电气工程—电力系统及自动化]