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
−0.1594 ± j5.3150
0.03
0.8459 Hz
Modal 2
−0.1954 ± j5.8811
0.0332
0.936 Hz
Modal 3
−0.2772 ± j8.1952
0.0338
1.2052 Hz