Abstract
The primary purpose of the static VAr system (SVS) is usually the rapid control of voltage at weak points in a network. A SVS is a combination of discretely and continuously switched VAr sources that are operating in a coordinated fashion by an automated control system. This includes the static VAr compensator (SVC) and the static synchronous compensator (STATCOM). In comparison to mechanically switched capacitors (MSCs) or mechanically switched reactors (MSRs), usually connected at a high voltage bus, the SVCs have a very rapid reaction and a good reliability. By using power thyristors, the static compensators present many advantages from several points of view, such as high reaction speed, insignificant contribution to the short‐circuit power, and low maintenance. The static compensator overcame mechanical commutation problems (sudden voltage variations and transient perturbations) and this is the reason why it gradually became the most used Flexible Alternating Current Transmission System (FACTS) device.
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