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Analyzing the stability of the power system by using a few machines ispromising for transient stability assessment. A hybrid direct-time-domainmethod that is fully based on the thinking of partial energy function isproposed in this paper. During post-fault period, a pair of machines with highrotor speed difference is defined as couple machines, and the stabilityanalysis of the system is transformed into that of several pairs of couplemachines. Based on the prediction of power-angle curve of couple machineswithin a sampling window after fault clearing, the proposed method avoids thedefinition of Center of Inertia (COI) and it can also evaluate the stabilitymargin of the system by using the predicted power-angle curve. Simulationresults demonstrate its effectiveness in transient stability assessment.

Power System Transient Stability Assessment Using Couple Machines Method