A New Vector Measurement Method for Power System Based on All-Phase Fourier Transform

A novel vector measurement method for power system based on all-phase Fourier transform (apFFT) is proposed. Due to apFFT’s excellent performance in suppressing spectral leakage and the property of ‘phase invariant’, this method can realize the accurate estimation of PMU phase angle, and then the time-shift phase difference correcting spectrum method is used to estimate the frequency and amplitude parameters. Simulation shows that, for the noise-free case, the proposed method is close to unbiased estimation, and the estimation accuracy is also higher than conventional method.