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Table 12 634-bus system operation condition

From: A matrix-perturbation-theory-based optimal strategy for small-signal stability analysis of large-scale power grid

State Eigenvalue Damping Frequency
Modal 1 −0.6028 + j14.5467 0.0414 2.31513608 Hz
Modal 2 −0.5486 + j14.4215 0.0381 2.295081967 Hz
Modal 3 −0.5134 + j13.6761 0.0375 2.176667197 Hz
Modal 4 2.1815 + j0.0000 −1 0 Hz
Modal 5 12.6029 + j0.0000i −1 0 Hz
…… ……. ……. …….