![]() The ultimate objective of applying reactive shunt compensation in a transmission system is to increase the transmittable power capability from the generator to the load, which is required to improve the steady-state transmission characteristic as well as the stability of the system. As long as the injected current is in phase quadrature with the line voltage, the shunt controller only supplies or consumes variable reactive power. ![]() The impedance of the shunt controller, which is connected to the line voltage, causes a variable current flow, and hence represents an injection of current into the line. In principle, all shunt-type controllers inject additional current into the system at the point of common coupling (PCC) through the means of a voltage source converter. Static shunt compensation is used to influence the natural electrical characteristics of the transmission line to increase the steady-state transmittable power and to control the voltage profile along the line. It is a member of the FACTS family of devices. If connected to a source of power it can also provide active AC power. 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. A STATCOM or Static Synchronous Compensator is a regulating device used on alternating current electricity transmission networks.
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