Abstract
Flexible AC transmission system (FACTS) is a technology that consists of a variety of power electronic devices which was developed with the aim of controlling both power and voltage at certain locations of the electricity grids during disturbances, improving the existing transmission line capacity and providing a controllable power flow for a selected transmission direction. This chapter provides a general overview for variable FACTS devices, concepts and topologies. It also provides brief information about various wind energy conversion systems.
Keywords: Flexible AC transmission systems, Wind energy conversion systems.