Dynamic Shunt Compensation
FACTS dynamic control devices for transmission systems include the Static Var Compensator, or SVC, and the Static Compensator, or STATCOM. Both use power semiconductors to control the amount of reactive power (measured in Mvar – megavolt amperes reactive) exchanged with the grid. This is necessary to maintain and control the grid’s voltage balance, and maintain stability to the transmission system, generation plant and other grid-connected parties.
SVC and STATCOM rapidly counteract fast voltage transients, reducing the risk of serious voltage depressions or even voltage collapse. Under steady state conditions, they continuously control reactive power injection or absorption, maintaining an optimal grid voltage profile and maximizing the system’s security and stability. Benefits include an increased stability limit dictated by system voltage and a more controlled voltage profile. The result is a more robust grid, with enhanced capacity, flexibility and predictability.