FACTS :A concept introduced by Electric Power Research Institute (EPRI)

FACTS is a concept introduced by Electric Power Research Institute (EPRI), USA.It is actually a group of advanced transmission technologies that rely on high speed, solid-state electronics, rather than electromechanical devices. By this concept, the apparent impedance of a transmission line is controlled according to certain algorithm. Thus the power system operation is made more reliable, controllable and efficient.

FACT system is a promising method, which can be implemented into the system for enhancing system stability by damping out system oscillations. At the heart of FACT are thyristors, which permit control and switching of megawatt levels of power within milliseconds.