A master thesis was discussed at the Southern Technical University about Stability Analysis of Power Grid System Undergoing an Increase in Extraction of Photovoltaic Generator .The thesis submitted by the student (Sarah Adnan Jassim) in the Master of Electrical Engineering Technologies program dealt with the analysis and design of an accurate model of the photovoltaic system connected to the grid, where the transient state of a network consisting of 20-BUS and 10-BUS with solar cells was analyzed using a program. The thesis showed that the photovoltaic cells maintain the reliability and stability of the test system, and the results showed that the filters significantly reduced the harmonics generated in the system.