A Dynamic Synchrophasor Estimation Algorithm Considering Out-of-Band Interference

Abstract

The existence of out-of-band interference (OBI) signals in power systems will dramatically degrade the performance of synchrophasor estimation. In order to alleviate the influence of OBI, a hybrid phasor model is proposed, in which the OBI phasor and the dynamic fundamental phasor are expressed by Taylor series, respectively. Then, the rough fundamental frequency and OBI frequency estimation are achieved via the rough fundamental component and OBI component estimated from discrete Fourier transform (DFT). For attaining the accurate phasor, the proposed algorithm can invoke the corresponding coefficient matrices calculated off-line according to whether the power signal contains OBI or not. Finally, field data and computer-generated signals are used to assess the proposed algorithm performance. The results obtained indicate that the proposed algorithm can enhance phasor estimation performance by keeping maximum TVEs below 0.001% and 1% under frequency deviation and power modulation tests with OBI, respectively.