Some problems exists in the detection and analysis of harmonic signals when using current wavelet basis function and fast Fourier transform algorithm, such as spectrum aliasing, spectrum leakage, etc.,and it causes a large error of detected harmonic wave. For the problems, a new accurate detection and identificationmothodis proposed in this paper, which using the Meyerwavelet basis function to make wavelet decomposition on harmonic signals due to its characteristics of infinite conductivity, biorthogonality and no spectrum aliasing phenomenon. After that, a simulation experiment of harmonic signals using this method is conducted and its result is compared with that of db3 wavelet basis analysis, which verified the accuracy and effectiveness of this method.

power quality;harmonic detection, wavelet analysis, Meyer wavelet