Reducing the error in phasor estimates from phasorlets in fault voltage and current signals

An assessment and reduction of the phasor error infiltration in estimates from phasorlets is proposed in this paper through a generalized least square formulation of the problem. It introduces a computationally simple and quick estimator that exploits the structure of the sinusoidal model, and provides the finest stable phasor estimate, very useful for fault voltage signals. It also proposes an extended signal model, by including a dc component to the sinusoidal model, in order to have a better control of the phasor error, specially useful when an aperiodic component is present in the input signal. The numerical simulations illustrate the improvement in speed and accuracy of the estimates, obtained in decicycles, as well as its still wavering nature, considered as the persisting limitation of this technique.