Design of a Robust Coordinated Power Oscillation Damper for Use with Large-Scale Wind Energy System Connected to a Multimachine Power System

Table 4

Critical oscillation modes considering the PSSs only.

Operating scenario	Mode	Eigenvalue	Frequency (Hz)	Damping ratio (%)	Participating generators
1	M1	−0.5917 ± j12.7268	2.026	4.64	WG
	M2	−1.9960 ± j8.7160	1.387	22.32	G3, G4
	M3	−0.9419 ± j4.8489	0.772	19.07	All G
2	M1	−0.5165 ± j12.7373	2.027	4.05	WG
	M2	−2.2823 ± j8.3930	1.336	26.24	G3, G4
	M3	−0.6929 ± j4.2338	0.674	16.15	All G
3	M1	−0.5162 ± j12.7368	2.027	4.05	WG
	M2	−2.3802 ± j7.9815	1.270	28.58	G3, G4
	M3	−0.3196 ± j3.2528	0.518	9.77	All G