Fast Fourier Transform (FFT) has been widely used in power system harmonic analysis, but the direct application of this algorithm has large errors and cannot truly reflect the harmonic conditions of the power grid. This paper improves the power system harmonic analysis algorithm based on Hanning window interpolation FFT, making the sampling frequency closer to synchronous sampling and reducing spectrum leakage. The simulation results verify that the improved algorithm has higher accuracy under frequency fluctuations.
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