Static VAR Compensator (SVC)
A Static VAR Compensator (SVC) is a shunt-connected static VAR generator or absorber whose output is adjusted to exchange capacitive or inductive reactive current to maintain or control specific parameters of the electrical power system (typically bus voltage).
The SVC is a variable impedance type shunt connected device. It is primarily used for voltage control, reactive power (VAR) control, dynamic & transient stability, and power oscillation damping.
The SVC can be divided into the following topologies:
Thyristor-controlled reactor (TCR)
Thyristor-switched reactor (TSR)
Thyristor-switched capacitor (TSC)
Fixed capacitor - Thyristor-controlled reactor (TCR)
Thyristor-switched capacitor (TSC) - Thyristor-controlled reactor (TCR)
Thyristor-Controlled Reactor (TCR)
A thyristor-controlled reactor (TCR) is a shunt-connected reactor in series with a bidirectional thyristor valve. The schematic diagram of TCR and its firing delay angle control are shown in Fig. 1. The TCR is used to control the VAR absorption by controlling the inductive reactive current using firing delay angle control.