Growing number of wind turbines is changing electricity generation profile all over the world. However, high wind energy penetration affects power system safety and stability. For this reason transmission system operators (TSO) impose more stringent connection requirements on the wind power plant (WPP) owners. On the other hand flexible AC transmission systems (FACTS) devices offer enhancement of grid stability and can facilitate grid code compliance for WPP.
In this paper state-of-the-art in FACTS for large WPPs with AC connection is given. FACTS devices (excluding HVDC) with their properties are described. Academic and industrial research in FACTS applicability for WPPs is summarized.