Evaluation of techniques for dynamic tracking of harmonics in transient state

This paper presents the performance and the numerical evaluation of existent methodologies for calculating the transient state of harmonics from a nonsinusoidal voltage/current waveform. The evaluated and compared techniques are phase-locked loop, windowed fast Fourier transform, Kalman, and a hybrid Kalman-wavelets technique. The major differences between them are stated according to the obtained results through some examples.