消除傅氏算法中衰减非周期分量的方法在信号频率偏离额定值时的特性研究  

Study of the characteristics of removing dc offset methods in fourier algorithm when signal has fundamental frequency deviation

作　　者：张艳霞[1] 刘天绪[1] 杨钢[2] 

机构地区：[1]天津大学电气工程与自动化学院,天津300072 [2]天津市电力公司,天津300143

出　　处：《继电器》2003年第4期15-17,共3页Relay

摘　　要：针对几种消除全波傅立叶算法中衰减非周期分量影响的方法 ,分析研究了它们在信号频率偏离额定值时的特性。研究结果表明 :单纯一次差分法在信号频率偏离额定值时 ,消除衰减非周期分量的特性最好 ;经差分全波傅氏算法求出的基波幅值最接近于实际值。The characteristics of three removing DC offset methods in Fourier algorithms are studied when signal has fundamental frequency deviation. Analytical results show: when signal has fundamental frequency deviation, difference algorithm has better performance of removing DC offset than other methods; and the signal fundamental amplitude calculated by the difference & Fourier algorithm is close to the real value. The work of this paper provides reference basis for the algorithm of measure element of power swing simultaneously with short-circuit fault.

关 键 词：电力系统 继电保护 微机保护 全波傅立叶算法 衰减非周期分量法 信号频率偏离额定值 特性 

分 类 号：TM774[电气工程—电力系统及自动化]