his project presents a power flow analysis model for the purpose of studying power flow in a power system model. At present electric power is an important factor driving the country both in industry and transportation. The demand for electric power tends to increase the production is insufficient to meet the demand. Therefore it is necessary to make the most of the energy resources available in the system. An effective system must be analyzed to detect possible errors. A sudden increase or decrease in load in the system may result in inadequate production and distribution efficiency. Therefore this project is presented for the analysis of power flow in a 3 bus 5 bus and 30 bus power system model using a math simulation program. It is divided into 3 case studies: Case 1 power flow under normal conditions Case 2 transmission line disconnection Case 3 adding distributed power generation sources.