Estimation of phasor under dynamic conditions using convolution

Abstract

The paper introduces a simple, fast and computationally efficient phasor estimation algorithm under dynamic conditions using convolution analysis. The performance of convolution based phasor estimator is effectively tested under different dynamic/noisy conditions as per IEEE C37.118.1-2011 standards. The results revealed that the proposed algorithm estimates the dynamic phasor accurately irrespective of distortion present in the sinusoidal signals. The proposed algorithm enhances the phasor estimation process to be more general and independent of phasor models of a signal. Furthermore, the proposed estimator inherently filters noise and harmonics, immune to decaying dc components, detects sharp changes in a signal during faults and effectively works under complex modulated conditions. The simplicity, robustness and generality of the proposed algorithm best suits for wide area measurement systems to measure the voltage and current phasors during disturbance in the power system networks.