A Novel Frequency Estimation Algorithm on Dynamic Condition in Power System

A novel dynamic instantaneous power-system frequency estimation method for phaser measurement units (PMUs) was proposed for generalized sinusoidal models, which was intending to simulate the dynamic condition via modulating phase and considering magnitude damping. Frequency estimation from traditional discrete Fourier transform (DFT) could be attained based on frequency and damping character of voltage signal and sampling frequency. Two slightly different were introduced to meet the different sampling system, which were for fixed sampling and frequency tracking system. Simulation results and laboratory experiments allowed us to conclude that proposed method´s performance was much better in comparison with the widely used phasor-based frequency measurement one under dynamic condition such as power system oscillation.