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In this paper, a novel design method for optimal tuning of brushless exciter parameters using . . . particle harm optiniitation algorithm is presented. The problem of simultaneous and coordinated tuning of brushless exciter and lead-lag power system stabilizer parameters of a single infinite bus power system is considered. This problem is formulated as an optimization problem, which is solved using particle swarm optimization technique. Also in this paper, the optimal W g of a fuzzp logic power system stabilize1 using particle swami optimization method is canied out.Simulation results show the effectiveness of the proposed particle swarm optimization-based leadlag power system stabilizer and p&cle swarm optimization-based fuzzy logic power system stabilizer to damp the oscillation of multi machine system and work effectively under variable loading and faukconditions.