基于FFT的傅里叶算法在微机继电保护中的应用  

Application of Fourier algorithm based on FFT in microcomputer-based relay protection

作　　者：刘建刚[1] 孙同景[1] 

机构地区：[1]山东大学控制科学与工程学院,山东济南250061

出　　处：《继电器》2004年第10期24-26,30,共4页Relay

摘　　要：传统的微机继电保护算法中,一般使用梯形算法[1]来计算周期信号的直流分量和各次谐波的系数,此方法计算比较复杂。本文提出了一种基于FFT的算法。该算法利用FFT可以由输入序列直接计算出输入信号的直流分量和各次谐波的幅值和相角的特点,大大简化了谐波分析的计算。与梯形算法相比,该算法具有精度高、计算量小、更易在数字信号处理器上实现等优点。因而可以取代梯形算法来计算谐波系数。针对FFT计算,还介绍了正弦信号采样频率的选择方法。Based on FFT, this paper puts forward a kind of power protection algorithm, with which the coefficients of fundamental and harmonics can be acquired directly from input sequence, so that the harmonic analysis is simplified greatly. Compared with traditional Fourier algorithm, the proposed one is more accurate, simpler and easier to achieve on DSP. So it can take place of the traditional Fourier algorithm to calculate the coefficients of harmonics. Also, a method of deciding the sampling frequency of sine wave is introduced.

关 键 词：电力系统 电网 继电保护 微机保护 FFT 傅里叶算法 

分 类 号：TM771[电气工程—电力系统及自动化]