STATCOM-STATic synchronous COMpensator: theory, modeling, and applications

This paper describes the theory and the modeling technique of a flexible AC transmission systems (FACTS) device, namely, the static synchronous compensator (STATCOM) using the EMTP simulation package. The STATCOM, a solid-state voltage source inverter coupled with a transformer, is tied to a transmission line. A STATCOM injects an almost sinusoidal current, of variable magnitude, at the point of connection. This injected current is almost in quadrature with the line voltage, thereby emulating an inductive or a capacitive reactance at the point of connection with the transmission line. The functionality of the STATCOM model is verified by regulating the reactive current flow through it. This is useful for regulating the line voltage.