Flexible AC transmission system
From Free net encyclopedia
Flexible Alternating Current Transmission System (FACTS) is a static equipment used for the AC transmission of electrical energy. It is meant to enhance controllability and increase power transfer capability. It is generally a power electronics-based device.
FACTS is defined by the IEEE as "a power electronic based system and other static equipment that provide control of one or more AC transmission system parameters to enhance controllability and increase power transfer capability."
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FACTS technology
FACTS could be connected:
- in series with the power system (series compensation)
- in shunt with the power system (shunt compensation)
- both in series and in shunt with the power system
Series compensation
In series compensation, FACTS is connected in series with the power system. It works as a controllable voltage source.
Shunt compensation
In shunt compensation, power system is connected in shunt with the FACTS. It works as a controllable current source.
Examples of FACTS for series compensation
- Static Synchronous Series Compensator (SSSC)
- Thyristor Controlled Series Capacitor (TCSC) or Thyristor Controlled Series Reactor (TCSR)
- Thyristor Switched Series Capacitor (TSSC) or Thyristor Switched Series Reactor (TSSR)
Examples of FACTS for shunt compensation
- Static Synchronous Compensator (STATCOM)
- Static VAr compensator (SVC)
- Thyristor Controlled Reactor (TCR)
- Thyristor Switched Reactor (TSR)
- Thyristor Switched Capacitor (TSC)
- Mechanically Switched Capacitor (MSC)
External links
- Siemens AG - FACTS website.fr:FACTS