A static synchronous compensator (STATCOM), originally known as a static synchronous condenser (STATCON),[1] is a regulating device shunt-connected[2] to alternating current electricity transmission network. It is based on a power electronics voltage-source converter and can act as either a source or sink of reactive AC power to an electricity network. If connected to a source of power it can also provide active AC power. It is a member of the FACTS family of devices, that became possible in 1990s due to availability of powerful gate turn-off thyristors (GTO).[1] STATCOM is inherently modular and electable[clarification needed].
These compensators can also be used to reduce voltage fluctuations.[3]
https://en.wikipedia.org/wiki/Static_synchronous_compensator
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