Unified
Power Flow Controller (UPFC)
•UPFC
stands for Unified
Power Flow Controller.
•UPFC
can control both active and reactive power flows in transmission
system.
•UPFC
uses solid
state devices.
•UPFC
is a combination of STATCOM
(shunt) and SSSC (series) coupled common voltage DC link.
•It
was invented for real
time control and dynamic compensation of AC transmission system.
•UPFC
can control simultaneously or selectively voltage impedance phase angle in
transmission line and hence it is called UNIFIED.
•UPFC
is a generalized synchronous voltage source (SVS).
•UPFC
consists of two back to back voltage source converter operated by common dc
link dc
storage capacitor.
•The
function of converter 1 is to supply or absorb real power demanded by converter
2.
•Converter
1 can be operated by unity
power factor.
•Reactive
power of converter 1 and converter 2 is independent of each other.
•Because
no reactive power flow through dc
link.
•The
UPFC can operate only under balanced sine wave condition.
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