page_title: Flexible AC transmission system
section_title: Examples of shunt compensation
hierarchical_section_title: Flexible AC transmission system / Examples of shunt compensation
caption_attribution_description: Examples of FACTS for shunt compensation (schematic)
context_page_description: A flexible alternating current transmission system is a system composed of static equipment used for the alternating current 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.
  FACTS is defined by the Institute of Electrical and Electronics Engineers 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".
  According to Siemens, "FACTS Increase the reliability of AC grids and reduce power delivery costs. They improve transmission quality and efficiency of power transmission by supplying inductive or reactive power to grid.
context_section_description: Static synchronous compensator (STATCOM); previously known as a static condenser (STATCON)
  Static VAR compensator (SVC). Most common SVCs are:
  Thyristor-controlled reactor (TCR): reactor is connected in series with a bidirectional thyristor valve. The thyristor valve is phase-controlled. Equivalent reactance is varied continuously.
  Thyristor-switched reactor (TSR): Same as TCR but thyristor is either in zero- or full- conduction. Equivalent reactance is varied in stepwise manner.
   Thyristor-switched capacitor (TSC): capacitor is connected in series with a bidirectional thyristor valve. Thyristor is either in zero- or full- conduction. Equivalent reactance is varied in stepwise manner.
  Mechanically-switched capacitor (MSC): capacitor is switched by circuit-breaker. It aims at compensating steady state reactive power. It is switched only a few times a day.
caption: Examples of FACTS for shunt compensation (schematic)
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