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Examoogle • User • info@examoogle.com • EE-2024-8821
Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
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FACTS devices are generally used for to compensate……………of the transmission line.
Reactance
Resistance
Conductance
Admittance
Reactance
FACTS (Flexible Alternating Current Transmission Systems) devices are power electronic-based systems used to enhance controllability and increase power transfer capability in transmission networks. They primarily function by compensating for the inductive or capacitive reactance of the transmission line to regulate voltage, stability, and power flow.
FACTS (Flexible Alternating Current Transmission Systems) devices are power electronic-based systems used to enhance controllability and increase power transfer capability in transmission networks. They primarily function by compensating for the inductive or capacitive reactance of the transmission line to regulate voltage, stability, and power flow.
P=XLV1V2sinδ — Power transfer equation showing inverse dependence on reactance
Q=I2XL — Reactive power consumption in an inductive line
Transmission lines possess inherent series impedance (Z=R+jXL). At long distances, the series inductive reactance (XL) causes significant voltage drops and limits the power transfer capability. FACTS devices, such as SVC (Static VARCompensator) or TCSC (Thyristor Controlled Series Capacitor), inject reactive power to effectively vary the line's impedance, thereby modifying the power flow equation P=XV1V2sinδ. By reducing the effective X, these devices increase the steady-state power transfer limits.
FACTS devices improve transient and steady-state stability.
They provide high-speed control of power flow through lines.
They are categorized into series, shunt, and series-shunt combinations.
Inductive reactance is the primary bottleneck in long-distance AC transmission.
Increased power transfer capability
Enhanced voltage profile regulation
Improved dynamic stability
Reduced transmission losses
High initial capital cost
Complex control and synchronization requirements
Potential for harmonic injection
Interconnecting regional power grids
Voltage support in industrial loads
Damping power system oscillations
Resistance (Option B) is inherent to conductors and generally cannot be compensated by FACTS devices; it is addressed through bundle conductors or high-voltage levels.
Conductance (Option C) represents leakage, usually negligible in power transmission lines.
Admittance (Option D) is the inverse of impedance, but FACTS devices specifically manipulate the reactance component (jX) to control flow.
A is correct — FACTS devices primarily manipulate the reactance of transmission lines to optimize power transmission and voltage stability.
Remember that shunt FACTS devices (like SVC/STATCOM) primarily regulate voltage, while series FACTS devices (like TCSC/SSSC) primarily control the line's impedance and active power flow.