Time-varying coherency study using TFC

Abstract

An assessment of the dynamic interactions between generators will provide valuable information which could improve control action and hence maintain stability in the interconnected system. The paper presents the study on dynamic interaction in terms of coherency established among the generators following a particular event. Time Frequency Coherency (TFC) method is applied to trace the coherency among the generators. The dominant inter-area modes on which TFC is applied has been extracted from empirical mode decomposition of the swing curve. The phase difference between the dominant modes will verify and refine the coherency results. The potential of TFC in power system application has been evaluated on test cases, power system model & Phasor Measurement Unit (PMU) signals.