中文说明：快速傅里叶变换是应用最广泛的一种谐波检测方法，但直接利用快速傅里叶变换进行谐波检测存在较大的误差，影响谐波分析结果的准确性。通过加汉宁窗及插值修正算法可以改善计算谐波频率、相位和幅值的准确度。简述了电力系统谐波检测非同步采样加汉宁窗插值算法的原理，并采用巴特沃斯低通滤波器滤除高频噪声。MATLAB仿真结果表明，加汉宁窗插值算法具有检测精度好，实现简单的优点。
English Description：
Fast Fourier transform (FFT) is the most widely used harmonic detection method, but there are large errors in harmonic detection directly using FFT, which affect the accuracy of harmonic analysis results. The accuracy of harmonic frequency, phase and amplitude can be improved by adding Hanning window and interpolation correction algorithm. The principle of asynchronous sampling and Hanning window interpolation algorithm for power system harmonic detection is briefly introduced, and Butterworth low-pass filter is used to filter high-frequency noise. Matlab simulation results show that the Hanning window interpolation algorithm has the advantages of good detection accuracy and simple implementation.