According to the Discrete Fourier Transform, this paper proposes a method of harmonic detection by band filter based on DFT algorithm, which improves the dynamic performance of detection system.

• 根据带通滤波器的瞬时谐波检测方法,离散傅里叶变换基本思想,提出了运用基于DFT的滤波算法实现带通滤波。