Application of the wavelet-packet transform to the estimation of harmonic groups in current and voltage waveforms

This paper presents a method to estimate the harmonic groups in voltage and current waveforms using the wavelet-packet transform. The wavelet-packet decomposition algorithm is selected to obtain output bands compatible with the harmonic groups defined in the harmonics measurement standards for power-supply systems. The method proposed is analyzed in the measurement of harmonic components, either synchronized or nonsynchronized, with the fundamental power frequency, comparing the results with the method proposed in the international standards.