New strategies for waveforms analysis using FFT

The paper presents a new method for the analysis of the number of harmonics that must be considered in order to respect the European standards. One intends to verify if the limitations are correct for a series of real cases. Some characteristic features of the data acquisition system along with the most important principles of numerical analysis are provided. The initial signals are sampled in agreement to their particularities. Numerical interpolation is used in order to provide a higher accuracy. The presented solution removes the limits imposed by the industrial power analyzers with respect to the evaluation of powers flow over harmonics and to some global quality parameters computation. The analysis was made at some power sources terminals. The analysis accuracy was verified through signals re-composition.