Self-Correction Strategies for Frequency Domain Ringdown Analysis

This paper introduces a set of self-correction strategies for improved oscillation modal analysis of ring down responses from synchrophasors in frequency domain analysis. It is shown that the modal estimates of frequency, damping ratio and mode shape using the improved frequency domain algorithms of the paper match well with other time-domain algorithms while preserving their inherent advantages of superior noise performance and computational speed. The new algorithms of the paper are especially suited for simultaneous ring down oscillation analysis of large number of Phasor Measurement Unit (PMU) measurements efficiently.