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Table 4 Eigen value analysis with PSO,DE and WOA

From: Interconnected multi-machine power system stabilizer design using whale optimization algorithm

  G 1 G 2 G 3
PSO −0.30 ± .1747i −1.3 ± 0.146i − 1.90 ± 13.5i
DE −0.37 ± 0.127i − 1.59 ± 16.2i, − 29.1 ± 11.6i
WOA − 0.405 ± 11.542i −1.83 ± 16.5i − 29.6 ± 11.6i