this paper presents the basic dynamic frequency model for the Egyptian electrical grid at 2024. Including five types of energy sources transfer function block diagram models "thermal, hydraulic, gas, nuclear, wind" model, as a one area power system divided on the energy sources shared each one by its ratio. In this paper: a dynamic stability analysis has been makes on this system to study the ability of addition the first Nuclear Power Plant (NPP) to the Egyptian grid. There are two cases of study the frequency disturbance, first one when NPP with different sizes "900 MW & 1200 MW & 1400 MW & 1650 MW" sudden forced outage from the grid, second one when the thermal model loss 1%, 2%, 5% and 10% of power generated. Moreover for treatment this disturbances PID controller has been used to get more system stability and reliability.