UPFC control for line power flow regulation

This paper describes the theory and simulation, by the numerical code SABER, of flexible alternate current transmission systems (FACTS) devices used in the electrical systems. One of these devices, unified power flow controller (UPFC), is chosen for a specific application, detailed in this paper, since it contains following elements: static Var compensator (SVC), controllable series compensator (CSC) and phase shifter (PS). It is able to control both active and reactive power flow.