Protection and Control of Modern Power Systems

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

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