Half-Cycle DFT-Based Phasor Estimation Algorithm for Numerical Digital Relaying

Abstract

In this article, a modification of the traditional half-cycle discrete Fourier transform (HCDFT) algorithm is proposed. The main objective is to combine the speed of a half-cycle data window with an efficient decaying DC component elimination method. The proposed algorithm was compared to other half-cycle ones, revealing the smoothest transient response and lowest overshoot.