This paper deals with the mitigation of electromechanical wave propagation in power systems. Different conventional controllers addressed this problem, such as the conventional PSS and the conventional
fuzzy logic PSS. In this paper, the fuzzy logic PSS is assisted by auxiliar y signals from the fuzzy logic PSS
of the interconnected machines to augment the damping of electromechanical wave propagation and the
associated oscillations. The neighbor ing machines speed deviation and its der ivatives signals are exploited
through the fuzzy logic PSS to assist the local fuzzy logic PSS. The disturbance propagation and reflection
phenomena are considered in the design of the adopted strategy. The efficacy of the proposed assistance
of the conventional fuzzy logic PSS are examined through different simulation results.