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____________________ is a combination of two or more independently controllable static synchronous series compensator (SSSC) which are solid state voltage source converters which inject an almost sinusoidalvoltage at variable magnitude and couples via a common DC link.
UPFC
SVC
STATCOM
IPFC
IPFC
Quick Trick: Look for the keyword 'Series' (SSSC) + 'Multiple' (combination of two or more) = IPFC (Interline Power Flow Controller).
Look for the keyword 'Series' (SSSC) + 'Multiple' (combination of two or more) = IPFC (Interline Power Flow Controller).
Analyze the keyword 'Series'
The question specifies SSSC (Static Synchronous Series Compensator). Devices starting with 'S' usually indicate series compensation, narrowing the search to SSSC-based controllers.
Identify the multi-converter structure
A single SSSC is just one converter. The mention of a 'combination of two or more' SSSCs connected via a common DC link defines the architecture of the Interline Power Flow Controller (IPFC).
A: UPFC uses both shunt and series converters, not just multiple series. B: SVC is a shunt device. C: STATCOM is a shunt device.
D is correct because IPFC is explicitly defined as a multi-converter system using two or more SSSCs sharing a common DC bus to control power flow across multiple transmission lines.
Always distinguish between FACTS devices based on their connection topology: Shunt (STATCOM/SVC), Series (SSSC), and Combined/Multi (UPFC/IPFC).