In this paper, application of Posicast control method to generator excitation system and Automatic Voltage Regulator (AVR)are presented. The method is one of the simplest possible control design methods that can be applied to Mitigate the oscillations caused by changing the excitation reference signal and occurrence large or small sudden faults. In other words, Posicast controller both improve and damping tle oscillations caused by changing the excitation reference signal and large or small suddn3-phase faults occurred in the different parts of the transmission lines. In this work, shown that the proposed controller improve angular stability in multi-machine power system. In facts, Posicast controller improve small signal and transient stability in four generators system. Stability of the designed controller is shown using extensive time domain simulations. Performance of Posicast controller in IEEE power system standard is evaluated in MATLAB/Simulink environment.

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