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Table 6 The 39-bus system unstable state

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

State Eigenvalue Damping ratio Frequency (Hz)
Modal 1 −0.1932 ± j6.8722 0.0281 1.0938
Modal 2 −0.1742 + j6.7736 0.0257 1.0738
Modal 3 −0.0143 ± j0.9386 0.0153 0.1494