Static VAR compensator

A static reactive compensator (English: static VAR compensator, SVC) is a system for compensation of reactive power in electrical energy transmission networks. The term static expresses that the compensation without the use of rotating machines such as three-phase synchronous machines is carried in the phase shifter operation.

In contrast to the rotating phase shifters with synchronous generators an SVC is a combination of capacitors and coils which are arranged parallel to the load or to be compensated for to be compensated at the network section pitching compensation. By thyristors of the current flow in the individual components is regulated and thus the degree of reactive power compensation. Compared to rotating machinery, this has the advantage that no deterioration of the system takes place, moreover, be a static compensator a much faster and more dynamic reaction to load variations possible.

So that the operating voltages in the range of the compensation circuit is not too high, and thus uneconomical, which are typically connected SVC in substations in the power transformers on their own and tertiary windings are usually operated in the voltage range of some 10 kV.

An SVC can be used not only for pure reactive power compensation, but also for various other tasks:

  • Voltage stabilization through controlled providing capacitive and inductive reactive power
  • Damping of subsynchronous oscillations in power, which could lead to power failures
  • Compensation of Flicker

An extension which, in addition to a static reactive power compensation and reactive power generation in the transverse and longitudinal compensation can also be specifically controlled active power flows in lines of electric power networks, the Unified Power Flow Controller ( UPFC ) and Static Synchronous Compensator are ( STATCOM ). The STATCOM and UPFC, the general can replace the equipment for the static reactive power compensation completely.

Realized investment in high-voltage networks

In German-speaking countries:

  • Lübeck- Siems substation
  • DC short coupling Duernrohr
  • Substation Vienna-Southeast

In Canada:

  • Lévis - icer
One-line diagram Power factor#Power factor correction in non-linear loads Power-line flicker Unified-Power-Flow-Controller
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