Fig. 2
From: A new measurement algorithm for PMU in power system based on all-phase Fourier transform
The apFFT spectrum of cosine signal under three different window function conditions. The three groups of data were pre-processed with no-window, single-window, and double-window functions. The sampling point N = 64, frequency sampling interval Δω = 2π/64 rad/s, and three single frequency cosine signals have digital angular frequencies of 3.25Δω, 3.375Δω, and 3.5Δω respectively. The graph is used to compare the leakage suppression ability of different window pre-processing