Rapidand truly expanding power request is progressively that specialize in the leading edge power framework. What's more, requirements on development of latest transmission network increase additional corruption of the exhibition of the force framework viz., expanded transmission capability power misfortune, diminished capacity of the force move in electrical power network, decrease in security of force framework, upgraded framework motions, voltage precariousness, then forth The FACTS (Flexible AC Transmission System) Regulators can upgrade the capacity of force move within the organization successfully without expanding power regulation of force framework. The FACTS Controllers are for the foremost part utilized for control of force stream, voltage guideline, framework steadiness improvement and damping of power framework motions in cable. The leading edge of exploration work done on various FACTS Controllers utilized for improving the presentation of the force framework is thoroughly introduced during this paper.

Keywords : FACTS (Flexible AC Transmission System ), AC Supply, ONTC (On Load Tap Changer), SVC (Static Variable Compansator).