Discussion
The UPFC FACT (Flexible AC Transmission) device can supply ______.
Answer: C
The unified power flow controller (UPFC) combines a shunt converter (a STATCOM) and a series converter (an SSSC) joined by a common DC link. The series converter can inject a voltage in series with the line, controlling both active and reactive power flow, and the shunt converter can supply or absorb reactive power and provide the real power for the DC link. So a UPFC can supply both active and reactive power, and it also controls the voltage. The answer is option C.
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