LAUSR

In this paper, we propose a synchrophasor estimator which can meet M and P class requirements of the IEEE standard C37.118.1 simultaneously. Meanwhile, the phase error of the estimator is always smaller than 0.05 degrees, which makes it applicable in distribution networks. The errors of the interpolated dynamic discrete Fourier transform (IpDFT) due to interharmonic interferences are investigated. Then the optimal frequencies where the IpDFT has the smallest interharmonic interference are obtained. For achieving higher accuracy, the Taylor-Fourier multifrequency modelbased method is used to estimate and then eliminate the interharmonic component further. Concerning response time requirements, robust thresholds for transient detection are obtained based on numerous simulations, and the Kaiser-based IpDFT is used to meet the corresponding limits. Canonical tests stated in the IEEE standard C37.118.1 and peculiar tests which could occur in distribution networks, are both carried out to verify the performances of the proposed method.