A Novel Time-Frequency Analysis for Power System Waveforms Based on “Pseudo-Wavelets”
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© 2018 IEEE. A novel multiresolution time-frequency analysis method for power system waveforms is proposed. Inspired by wavelet transform, which is widely used in time-frequency analysis of signal to achieve high resolution in both time and frequency domains, the proposed method uses 'pseudo-wavelets' and performs similar procedures to calculate the correlations between scaled 'pseudo-wavelets' and input signal, revealing the detailed energy distribution of input signal on a wide frequency range throughout the entire data window length. Both mathematical derivation and simulations show that the proposed method is capable of frequency tracking and disturbance detection. By extracting the features of proposed transform on typical power system signals, disturbance classification is also made possible.
author list (cited authors)
Qian, C., & Kezunovic, M.