An improved dynamic synchrophasor estimator

Abstract

Accurate real-time measurement of the synchrophasor of an electric waveform is one of the many open challenges in future smart power grids. Indeed, monitoring, protection and control capabilities of electric energy transmission and distribution systems heavily depend on the performance of the employed Phasor Measurements Units (PMUs). This paper proposes an enhanced DFT-based dynamic synchrophasor estimator that exhibits improved response time and accuracy performances with respect to the related state-of-the-art. A comprehensive characterization of the synchrophasor estimation accuracy, expressed in terms of Total Vector Error (TVE), is provided under both steady-state and dynamic conditions.

Accurate Phasor Estimation During Power Swing

“…Using samples values for one cycle, (7) can be expressed as (8), where t 0 is the reference time of the phasor. It can also be written as…”

“…This technique uses phasor derivative in consecutive observation windows to track the oscillations. The accuracy of above technique is improved in [8] using overlapping windows. To further improve the phasor measurement accuracy, a consecutive DFT method, which uses the relation between three successive phasors is proposed in [9].…”