A fast algorithm for frequency estimation of power systems in colored noises

A technique for tracking the frequency of power systems in sine noises using numerical differentiation is presented in this paper. A voltage or current sinusoidal signal corrupted by a sine noise with the frequency varying from 0 to 300 Hz, the amplitude varying from 0 to 300 V, and the phase angle varying from 0 to 360 degree is taken into consideration. Using central numerical differentiation with 7 points, the proposed algorithm shows more advantage in time and speed compared with other existing techniques, and shows better dynamics and high accuracy infrequency estimation. The simulation results of a test example carried out in Matlab are satisfactory.