Cs. Moo et Yn. Chang, GROUP-HARMONIC IDENTIFICATION IN POWER-SYSTEMS WITH NONSTATIONARY WAVE-FORMS, IEE proceedings. Generation, transmission and distribution, 142(5), 1995, pp. 517-522
A strategy of 'group-harmonic' identification is proposed for re-evalu
ating harmonic levels in power systems. The proposed strategy can reli
eve the problem of spectral leakage in the conventional application of
the fast Fourier transform (FFT). Incorporating group-harmonic identi
fication, the FFT algorithm can retain its efficiency for accurate har
monic calculations, especially for power systems with nonstationary wa
veforms.