Harmonic and Inter-harmonic Signal Analysis Based on Hilbert-Huang Transform

Because of the extensive application of the non-Linear electrical equipment, aircraft power system contains a number of harmonic and inter-harmonic components. Aiming at the situation that Fourier transform and wavelet transform method could not effectively extract and analyze these harmonic and inter-harmonic signal, made use of Hilbert-Huang Transform (HHT) to extract and analyze harmonic and inter-harmonic components for the aircraft power system. Meanwhile, in order to solve the question of overshoots/undershoots existing during empirical mode decomposition(EMD), made use of cubic Hermite polynomial interpolation instead of cubic spline interpolation to extract the envelope curve. The result of simulation shows that HHT can effectively extract and analyze harmonic and inter-harmonic components for the aircraft power system.