Water Resources and Power

In order to obtain reasonable and precise voltage flicker signal for adjusting equipment parameters and control strategies in improving grid stability,a novel method based on Hilbert-Huang transform is introduced to extract the model instantaneous phase,amplitude and frequency parameters of voltage flicker signal.The voltage flicker signal can be simultaneously analyzed from the aspects of time-domain and frequency-domain.EMD is used to extract the intrinsic mode function component of the voltage flicker signal.And then Hilbert-Huang transform is adopted to obtain the instantaneous amplitude and frequency data.The result shows that the proposed method is feasible and effective to extract voltage flicker signal and the data have high accuracy,which can meet the practical applications.