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THYRSITOR CONTROLLED REACTORS (TCR)
TCRs are extensively used in dynamic VAR compensation applications such as Static Var Compensation (SVC).
A thyristor-controlled reactor (TCR) is connected in series with a bidirectional
thyristor valve. The
TCR reactor generates inductive reactive power of SVC. TCR's are essentially
shunt reactors, but
the current is continuously regulated by the thyristor valves. The three
phase reactors are delta
connected and each phase is split into two coils and the thyristors are
connected between the
coils. Changing the trigger angle of a thyristor alter its admittance which
will vary the
fundamental current thereby varying the reactive power absorbed by the reactor.
The
capacitor provides fixed compensation for the reactive
power in SVC, while TCR can absorb continuously controlled
reactive power with a lagging power factor. The SVC thus
expands the dynamic compensation range with both lagging
and leasing power factors.Static VAr compensation system using thyristor controlled reactors can take care of PF correction, voltage variation, flicker compensation, harmonic suppression, containing oscillations etc all under one roof. The reactors current
can be controlled in continuous manner from zero, if the
switch is turned off, to its maximum value, when the
reactor is directly connected to the source. Quality Power
manufactures highly robust TCR's with Q factor >175 up to
1OO MVAr rating.
