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The term FACTS (Flexible AC Transmission Systems) covers a number of technologies that enhance the security, capacity and flexibility of power transmission systems[1].
The FACTS(Flexible AC Transmission Systems) provide the following advantages:
- Increased power transmission capability
- Provide dynamic reactive power support and voltage control
- Reduced need for construction of new transmission lines, capacitors, reactors, etc
- Improved system stability
- Mitigation of potential Sub-Synchronous Resonance problems[3].
Most Common FACTS devices include:
- Thyristor Controlled Series Capacitor (TCSC)
- Thyristor Controlled Phase Angle regulator (TCPAR)
- Static Condenser (STATCON)
- Unified Power Flow Controller (UPFC)[3].


FACTS devices are mainly applied in the areas of power transmission and quality, Series and Shunt reactive power compensation.


[1] ABB.com's FACTS page. URL: http://www.abb.com/facts
[2] Advanced Transmission Technologies. URL: http://certs.lbl.gov/ntgs/issue-6.pdf
[3] California's Energy Page. URL: http://www.energy.ca.gov/reports/2002-01-10_600-00-037.PDF

Key Technology Area: 
Advanced Components

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