A simple algorithm for power system frequency estimation

This paper presents development and implementation of a novel digital signal processing algorithm for on-line estimation of the fundamental frequency of non-sinusoidal power system signal. The algorithm relies on stable band-pass second degree digital integrator (BPSDDI) based rigorous mathematical deduction and recombines itself with zero-crossing avoiding technique. The proposed algorithm provides high degree of immunity and insensitivity to harmonics and noise, and fast response during time varying conditions. Structural simplicity, wide range of application, controls over speed and accuracy, and parameter robustness are other salient features of the method. The simulation results confirm the validity and accurate performance of the proposed approach under different operating conditions.