Improved Phasor Characterization of Power System Transients Using Adaptive Spectral Adjustment

Abstract

System Operators and Reliability Coordinators in the control room rely on accurate representation of real-time system conditions to obtain situational awareness and execute critical decision-making within the time limit stipulated by NERC. During dynamic transient period, the characteristics of power system waveforms, represented by phasor parameter, evolve continuously. To track the dynamic features of power systems, in our study, a fast and accurate phasor parameter calculation algorithm is discussed. The proposed technique tracks current system frequency, and in real-time compensate for the spectral leakage incurred in raw DFT estimate. Compared to interpolated DFT (IpDFT) technique, in which only the highest three DFT components are used, in the proposed technique, the spectral leakage is mitigated using the entire DFT spectrum. Moreover, the adverse impact of harmonic components is mitigated, which is not resolved in the previous techniques, including IpDFT. Simulation results revealed that the work in his paper captures the features of power system behaviors with accuracy and efficiency.