Fig. 9From: Frequency estimation and tracking by two-layered iterative DFT with re-sampling in non-steady states of power systemPerformance comparison of three algorithms in scenario 1 (in the first algorithm (red)), initial frequency estimation of DFT iteration is aided by AES, in which P = Q = 7. In the second algorithm (green), initial frequency for DFT iteration is set to be 60 Hz in every cycle. The third one is from paper [31])Back to article page