Download Chapter 3 VOLTAGE CONTROL

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Transcript
Bus
Anti-parallel
thyristor switch
Fixed
capacitor
Inductor
Fig. 13 Schematic diagram of SVC
The reactor control is done by an anti-parallel thyristor switch assembly. The
firing angle of the thyristors governs the voltage across the inductor, thus
controlling the reactor current. Thereby the reactive power absorption by the
inductor can be controlled. The capacitor, in parallel with the reactor, supplies the
reactive power of QC VAR to the system. If QL is the reactive power absorbed by
the reactor, the net reactive power injection to the bus becomes
Qnet = QC – QL
(37)
In SVC, reactive power QL can be varied and thus reactive power Qnet is
controllable. During heavy load period, QL is lesser than QC while during light load
condition, QL is greater than QC. SVC has got high application in transmission
bus voltage control. Being static this equipment, it is more advantageous than
synchronous compensator.