A new coordinated fuzzy controller for exciter and governor systems of a SMIB power system

In a previous work, a conventional power system stabilizer (PSS) has been employed simultaneously in excitation and governor systems (EGPSS) for stability improvement of a Single Machine Infinite-Bus (SMIB) power system. In order to more enhance stability and overcome the drawbacks of conventional PSS, we have studied in this paper, implementation's effect of fuzzy logic controller (FLC) into excitation and/or turbine governor systems (FLCE, FLCG, FLCEG). Obtained results, by nonlinear simulation using Matlab/Simulink of a SMIB power system, show the effectiveness of using Fuzzy logic controller both in excitation and governor loops (FLCEG) for large and small disturbances. Our results concern: rotor angle (δ), terminal voltage (V
_t
), electrical torque (T
_e
) and speed deviation (Δω) for the four cases: simultaneous conventional PSS (EGPSS), FLCE, FLCG and FLCEG.