HHT method for analyzing time-varying har- monic, attenuation harmonic, discontinuity harmonic and other non-stationary signal of harmonic is more accurate than FFT method and wavelet analysis method. In order to solve the prob- lem of HHT method in analysis harmonic signal, using shape-preserving piecewise cubic Hermite interpolating polyno- mial to solve the problem of envelope curve and use correlation coefficient method to identify the false IMF component was to put forward in this paper. In view of the harmonic signal is con- mined in the base wave components and impact analysis accura- c...
