Flexible AC transmission system
![Transmission on a no-loss line.](/Images/godic/202501/13/FACTS_theory13500.PNG")
![Series compensation.](/Images/godic/202501/13/FACTS_theory_series_compensation3500.PNG")
![Shunt compensation.](/Images/godic/202501/13/FACTS_theory_shunt_compensation13500.PNG")
![Examples of FACTS for series compensation (schematic)](/Images/godic/202501/13/FACTS_series_compensation13500.PNG")
A flexible alternating current transmission system (FACTS) is a system composed of static equipment used for the AC transmission of electrical energy. It is meant to enhance controllability and increase power transfer capability of the network. It is generally a power electronics-based system.