Accuracy of Synchrophasor Estimation Returned by a Frequency-Domain Linear Least-Squares Algorithm

In this paper the accuracy of the synchrophasor estimator returned by the enhanced frequency-domain linear least-squares (e-FLLS) algorithm recently proposed in the scientific literature is investigated. Harmonically distorted or modulated electrical signals at off-nominal frequency are considered either in the presence or absence of additive wide-band noise. The e-FLLS algorithm is based on the rectangular window and it estimates the phasor amplitude and phase using three Discrete Fourier Transform (DFT) samples. It effectively reduces the detrimental contributions of both the fundamental image component and wide-band noise on the estimated parameters. The accuracies of the e-FLLS algorithm and the corrected Interpolated DFT (IpDFTc) algorithm are then compared to each other through computer simulations in different operating conditions. As accuracy parameter the Total Vector Error (TVE) is used.