【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。从而为电力系统振荡闭锁过程中判别再故障元件的算法提供了参考依据更多还原

【Abstract】 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.更多还原