一种傅氏算法在频率偏移时根据相角修正幅值的方法

A method for Fourier Algorithm to Correct Amplitude Based on Phase Angle at Frequency Offset

在电力系统频率发生偏移时,定间隔采样的傅氏算法计算出的电压(电流)幅值、相角和实际值存在偏差,无法直接使用。文章在理论推导出全波傅氏算法在频率偏移时幅值、相角的基础上,提出了一种频率偏移时,根据相角修正幅值的方法。并利用MATLAB仿真验证了该方法的正确性。

When the frequency of the power system is offset,the voltage(current)amplitude and phase angle calculated by the Fourier algorithm of fixed interval sampling are different from the actual value,which cannot be used directly.On the basis of the theoretical derivation of the amplitude and phase angle of the full wave Fourier algorithm at the frequency offset,a method for correcting the amplitude according to the phase angle is proposed.The correctness of the method is verified by MATLAB simulation.