Harmonic detection method, device and system

The invention provides a harmonic detection method, device and system, and the method comprises the steps: carrying out the mutual convolution of a first window function and a second window function, and obtaining a third window function; windowing a to-be-detected signal by using the third window function, and performing discrete Fourier transform (DFT) on the windowed to-be-detected signal to obtain a first DFT function; correcting the first DFT function by adopting an interpolation algorithm to obtain a second DFT function; correcting the to-be-detected signal according to the second DFT function to obtain a corrected to-be-detected signal; and obtaining a signal parameter of the to-be-detected signal according to the corrected to-be-detected signal. The signal parameters obtained by the harmonic detection method are high in accuracy. 本发明提供一种谐波检测方法、装置及系统，其中方法包括：将第一窗函数与第二窗函数相互卷积，得到第三窗函数；采用所述第三窗函数对待检测信号进行加窗，并对加窗后的待检测信号进行离散傅里叶DFT变换，得到第一DFT函数；采用插值算法对所述第一DFT函数进行修正，得到第二DFT函数；根据所述第二DFT函数对所述待检测信号进行修正，得到修正后的待检测信号；根