In recent decades, there are considerable progressions research in modelling, simulation and control strategies. The advanced technologies in the combined cycle power plants offers more effectiveness and lower environmental effect compared to the conventional systems. Fuzzy logic control is one of the frequently advanced controllers may well improve the performance of the control system in the power plant. This study focuses on the improvement of governing control system by using fuzzy logic controller. Thus, a combined cycle gas turbine plant has been modelled and simulated on MATLAB/Simulink, and a fuzzy logic controller was implemented. The simulation results are compared with that of conventional PID controller tuned by Ziegler Nichols method.