📓 In this book, the location of FACTS device is simulated to control active and reactive power flow in an AC transmission line system using MATLAB. The simulation is done at various locations of AC transmission line system and then results are checked to determine the exact location. The FACTS device which is assumed as STATCOM. Simulation is performed in 3 bus system for results. Here, STATCOM is analyzed for its working. When FACTS device STATCOM is used, other parameters such as voltage stability, power system security are maintained and controlled in an AC transmission line system.