Which of the following is the area of FACTs application?

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Examoogle · Accepted Answer

Option D: All of these

Explanation & Concepts:
FACTS (Flexible Alternating Current Transmission Systems) utilize power electronic devices to increase the capacity, controllability, and stability of electrical transmission systems. They are widely applied across the entire power network, including transmission lines, distribution networks for power quality, and renewable energy integration.

Working Principle: FACTS devices work by modulating the parameters of the transmission system—specifically series impedance, shunt admittance, and voltage phase angle—using high-speed switching controllers. By adjusting these variables, they control power flow, mitigate voltage sags/swells, and provide fast dynamic reactive power compensation to improve system stability.

Key Formulas: $P = \frac{V_1 V_2}{X} \sin(\delta)$ — Power flow equation showing dependence on reactance $X$; $Q_{c} = V^2 \omega C$ — Reactive power compensation principle for shunt capacitors

Key Points: FACTS devices improve transient and steady-state stability.; They provide instantaneous control over power flow paths.; Common devices include SVC, STATCOM, TCSC, and UPFC.; FACTS significantly enhances the integration of stochastic renewable energy.

Advantages: Improved power transfer capability of existing lines.; Better voltage regulation and power quality.; Fast dynamic response to disturbances.; Reduced environmental impact compared to building new lines.

Disadvantages: High initial capital cost.; Complexity in control system design.; Harmonic generation due to high-frequency switching.; Requirement for sophisticated protection coordination.

Applications: Transmission line congestion management.; Flicker mitigation and voltage stabilization in industrial loads.; Wind/Solar farm grid code compliance and voltage support.

Additional Info: FACTS is defined by IEEE as an alternating current transmission system incorporating power-electronic-based and other static controllers to enhance controllability and increase power transfer capability.. SVC (Static Var Compensator) and STATCOM (Static Synchronous Compensator) are primary devices used for voltage support.

Answer: D is correct — FACTS devices are versatile power electronics controllers used for transmission capacity enhancement, power quality improvement, and grid integration of renewable energy sources.

Exam Tip: Always remember that FACTS essentially manipulates the impedance ($X$), voltage magnitude ($V$), and phase angle ($delta$) of transmission lines to optimize flow.

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Option A: Power transmission

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Option B: Power Quality

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Option C: Wind power grid Connection

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