The Effect of the Appropriate Placement of UPFC on Static Loading Limit in the Power System

Appropriate placement of reactive power sources, which are parallel capacitors or flexible alternating current transmission systems controllers (FACTS), can effectively improve loading level and the system voltage stability margin. The aim of this study is to investigate the effect of UPFC (Unified Power Flow Controller) on power system static loading. To this end, continuation power flow is used to calculate the maximum loading point and its corresponding megawatts margin. Using PSAT (Power System Analysis Toolbox) software, the proper place of this controller on the IEEE 14-bus power system, is determined. The results show that UPFC effectively increases the static loading margin of power system.