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What is the main disadvantage of FACTS?
Very costly
Less costly
Enhance controllability
None of these
Very costly
Flexible Alternating Current Transmission Systems (FACTS) are sophisticated power electronic-based devices designed to enhance the controllability and power transfer capability of AC transmission networks. The primary disadvantage is their exceptionally high capital cost, which often limits their deployment to critical nodes within a power grid.
Flexible Alternating Current Transmission Systems (FACTS) are sophisticated power electronic-based devices designed to enhance the controllability and power transfer capability of AC transmission networks. The primary disadvantage is their exceptionally high capital cost, which often limits their deployment to critical nodes within a power grid.
P=XV1тАЛV2тАЛтАЛsin(╬┤) тАФ Power flow equation where FACTS controllers regulate X (impedance) or ╬┤ (phase angle)
Q=XV1тАЛтАЛ(V1тАЛтИТV2тАЛcos(╬┤)) тАФ Reactive power flow equation regulated by shunt-type FACTS devices
FACTS devices utilize high-speed power semiconductor switches like Thyristors, GTOs, or IGBTs to modify transmission parameters such as line impedance, phase angle, and voltage magnitude. By providing real-time control over reactive and active power flows, they allow lines to operate closer to their thermal limits; however, the complexity of these high-power converters and the requirement for specialized high-voltage insulation and protection systems significantly increase their installation and maintenance costs.
FACTS devices improve transient stability and steady-state power transfer.
They provide dynamic voltage control, reducing the need for mechanical switching.
The primary drawback remains the high cost of high-power semiconductor converters and control infrastructure.
FACTS are typically categorized as shunt, series, or combined shunt-series controllers.
Increased power transfer capability
Better control over reactive power flow
Enhanced transient and small-signal stability
Reduced line losses through optimal power flow
High initial investment and capital costs
Increased system complexity in control logic
Requirement for advanced maintenance personnel
Potential for harmonic pollution requiring filtering
Voltage stability enhancement in long transmission lines
Power flow control in meshed networks
Damping of sub-synchronous oscillations
Integration of renewable energy sources into the grid
Standard FACTS devices include SVC (Static VARCompensator), TCSC (Thyristor Controlled Series Capacitor), and STATCOM (Static Synchronous Compensator).
Option B is incorrect because FACTS technology involves advanced power electronics which are significantly more expensive than traditional passive mechanical compensation methods.
A is correct тАФ The main barrier to the widespread adoption of FACTS technology is their high cost relative to traditional transmission upgrades.
Always remember that while FACTS increases 'controllability' (a benefit), the question asks for a 'disadvantage', making the economic aspect the primary concern.