<span lang="EN-US">Due to the increased demand for renewable energy, the interest in the large-scale solar photovoltaic (LSSPV) power plant has recently grown dramatically. However, when a large amount of electricity is produced from the LSSPV power plant to the grid interconnection, the system commonly experiences instability and thus disrupt the grid system in disturbance issues such as bus fault, line-to-line fault, three-phase fault, and tripping. This sudden disturbance occurrence is tended to interrupt the stability of the system from providing balanced electrical production within the electrical grid. A dynamics response from the simulation is used to study the stability and the behavior of the photovoltaic (PV) plant into the grid interconnection by developing 118 bus system. The observation of critical clearing time (CCT) duration shows that the result from the simulation where the duration takes less than t=15 s for the system to get back to its pre-fault condition in three-phase fault and tripping in a dynamic simulation to shows that the system reaches its stability been observed through the simulation result by using from user-specific models to generic models like those advocated by the Western electricity coordinating council (WECC) in power system simulator for engineering (PSSE) software.</span>

Due to increase demand of renewable energy, the interest on the solar power plant has recently grown dramatically. However, when a huge generation of power was generating from the solar power plant to the grid interconnection, the system tends to create a stability problem since the generation is depend on varying of solar irradiance. A huge sudden drop of the irradiance will tend to interrupt the stability of the system. When there is large solar power is used it might be interrupting the stability of the PV plant. When there is system increase in penetration to the system the system may be loss its stability which can interrupt the system operation that cause by large penetration trough the PV system. This paper presents the development PV model from scratch until dynamic stability assessment in the PSSE software in order to study the stability of the generation of PV plant to the grid interconnection by developing 30 bus system in the software.