Discussion
Which of the following is NOT an FACT (Flexible AC Transmission) device?
Answer: D
FACTS devices are power electronic controllers for AC transmission systems: shunt compensators (the static VAR compensator and STATCOM), series compensators (TCSC and SSSC), and combined controllers such as the unified power flow controller (UPFC). A DC-DC converter changes one DC voltage level to another, and it is used in drives and power supplies, not as a FACTS controller of an AC line. The answer is option D.
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