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.