...叶变换(DFT)； 递推DFT； 继电保护； 衰减直流分量 [gap=973]Keywords：discrete fourier transformation (DFT); recursive DFT; computer relay; attenuation direct-current component ..
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This method is easy to compute the frequency offset and adopts the recursive DFT method.
该方法频率偏移量计算简单且采用递推dft，有效减少了计算量。
The spectral leakage caused by the truncated signals results in frequency calculation error and slows frequency tracking. A Hanning windowed recursive DFT method is introduced.
但由于截断信号会产生频谱泄漏，使得相位和频率计算结果有一定误差，采用该方法跟踪频率，实时计算电网变化的频率速度较慢。
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