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

Table 3

Critical oscillatory modes without damping controllers.

Operating scenario	Mode	Eigenvalue	Frequency (Hz)	Damping ratio (%)	Participating generators
1	M1	−0.5920 ± j12.7266	2.025	4.64	WG
	M2	−0.3767 ± j7.3648	1.172	5.10	G3, G4
	M3	0.1253 ± j4.7558	0.757	−2.63	All G
2	M1	−0.5167 ± j12.7364	2.027	4.05	WG
	M2	−0.6908 ± j7.1551	1.139	9.61	G3, G4
	M3	0.2046 ± j4.1643	0.663	−4.91	All G
3	M1	−0.5163 ± j12.7357	2.027	4.05	WG
	M2	−0.8743 ± j6.9612	1.108	12.46	G3, G4
	M3	0.3087 ± j2.9894	0.476	−10.27	All G