Abstract—Weak damping of low frequency oscillations is a frequent phenomenon in electrical power systems. These frequencies can be damped by power system stabilizers. Unified power flow controller (UPFC), as one of the most important FACTS devices, can be applied to increase the damping of power system oscillations and the more effect of this controller on increasing the damping of oscillations...

This paper offers novel non-linear control of a doubly fed induction generator (DFIG) and unified power flow controller (UPFC) for transient stability increment with energy function (TEF) sliding mode observer in system. First, the TEF technique is considered damping system synchronous (SG), DFIG, UPFC, then time-derivative signals are estimated by second-order observer. The importance issue em...

The electricity demand is continuously increasing, so a most efficient use of the current power system's capacity desired. Flexible AC Transmission Systems (FACTSs), recently developed transmission technology, are widely used to boost transfer ability long-distance line networks and enhance consistency systems. FACTS devices can lead reduced flows on heavily loaded lines, targeted bus voltage l...

Electric power system is exceptionally complex as far as its managing, construction and operation is concerned. In addition ever increase of electric power demand is making a process of managing, monitoring and controlling of electric power system more challenging day by day. Due to increased power demand congestion takes place in some of the lines. To remove congestion and improve loadability ...

Long distance AC transmission is often subject to stability problems, which limits the transmission Capability. Large interconnected power systems often suffer from weakly damped swings between synchronous generators and subsystems. This paper studies the comparative performance of SSSC and UPFC for the improvement of transient stability and damping of power swings of a multi-machine power syst...