In this paper, the objective is to promote the power system performance by using Unified Power Flow Control (UPFC) and Static VAR Compensator (SVC) then comparing the results in different networks. The results are tested on the IEEE 5 bus, IEEE 9 bus, and IEEE 30 bus, by using computer software MATLAB/PSAT. The Optimal location of FACTS is determined by using Continuation Power Flow (CPF) in PSAT to find the weakest point. Particle Swarm Optimization (PSO) is used to reach the optimal location of FACTS.Theobjective function is the voltage deviation of the bus and the power losses. To get appropriate FACTS locations easier and with more flexibility, In this paper, a new interface that depends on PSO to detect the most suitable positions is used to select the ratings of FACTS equipment in power system networks. This application called the Optimal Power Flow (OPF) toolbox, It enables the servant to choose a power system network and define the PSO settings. Then, the operation that relies on PSO to obtain the best conditions is carried out to increase the system's stable load capacity. The emulation outcomes obtained by IEEE test networks using 118 buses prove the appropriate effectiveness and flexibility of the FACTS OPF toolbox.