This set of FACTS Multiple Choice Questions & Answers (MCQs) focuses on “Static Voltage and Phase Angle Regulators”.
1. The operation of the Static Synchronous Voltage and Angle Regulators is analogous to those compensation characterizing ideal synchronous machines.
a) True
b) False
View Answer
Explanation: The operation of the Static Synchronous Voltage and Angle Regulators is analogous to those compensation characterizing ideal synchronous machines. They also perform analogous to compensating ideal synchronous machines. Both of them provide approximately instantaneous speed of response and control features independent of system voltage during shunt operation and current during series operation.
2. The circuit configuration of Thyristor-Controlled Voltage and Phase Angle Regulators is similar to that of breaker-switched capacitors, reactors and mechanical tap-changing transformers.
a) True
b) False
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Explanation: The circuit configuration of Thyristor-Controlled Voltage and Phase Angle Regulators is similar to that of breaker-switched capacitors, reactors and mechanical tap-changing transformers. It appears so because the former employs reactive impedances and tap-changing transformers with conventional thyristor valves (switches) as controlled elements. However, these regulators exhibits much faster response and sophisticated operation controls than the later.
3. Static Synchronous Voltage and Angle Regulators employ ________ switching converters.
a) self-commutated, voltage-sourced
b) self-commutated, current-sourced
c) forced-commutated, voltage-sourced
d) voltage-commutated, current-sourced
View Answer
Explanation: Static Synchronous Voltage and Angle Regulators employ self-commutated, voltage-sourced switching converters. In doing so, they realize rapidly controllable, static synchronous voltage sources. Thus they become important FACTS Controllers.
4. The Static Synchronous Voltage and Angle Regulators provide reactive compensation without ac capacitors or reactors.
a) True
b) False
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Explanation: The Static Synchronous Voltage and Angle Regulators provide reactive compensation without ac capacitors or reactors. They automatically produce or take in the reactive power exchanged with the system because of their intrinsic capability to exchange both real and reactive power with the ac system, just like a synchronous machine does. However, the real power exchanged must be supplied to them, or absorbed from them, by the ac system.
5. ________ is accomplished by ‘quadrature voltage injection’ technique.
a) Only voltage regulation
b) Only phase-angle regulation
c) Both phase-angle regulation and voltage regulation
d) Neither phase-angle regulation nor voltage regulation
View Answer
Explanation: Only phase-angle regulation is accomplished by ‘quadrature voltage injection’ technique. The GTO-based voltage source generates the required voltage for compensation. The generated voltage is injected to the line.
6. ________ is accomplished by ‘in-phase voltage injection’ technique.
a) Only voltage regulation
b) Only phase regulation
c) Both phase regulation and voltage regulation
d) Neither phase regulation nor voltage regulation
View Answer
Explanation: Only voltage regulation is accomplished by ‘in-phase voltage injection’ technique. Phase regulation is NOT accomplished by ‘in-phase voltage injection’ technique. For ‘in-phase voltage injection’ technique, the excitation transformer with on-load tap changer can be used.
7. The thyristor-based compensation in FACTS may include the insertion of voltage from appropriate taps of the regulating transformer.
a) True
b) False
View Answer
Explanation: The thyristor-based compensation in FACTS may include the insertion of voltage from appropriate taps of the regulating transformer. The excitation transformer achieves it using on-load tap changer. Thus voltage regulation is accomplished.
8. Voltage regulation comes into play when the rotationally oscillating generator accelerates.
a) True
b) False
View Answer
Explanation: Voltage regulation comes into play when the rotationally oscillating generator accelerates. This is done to achieve compensation for excess mechanical input power during acceleration of the rotationally oscillating generator. The electric power transmitted must be increased to balance the excess mechanical input power.
9. Voltage regulation comes into play when the rotationally oscillating generator decelerates.
a) True
b) False
View Answer
Explanation: Voltage regulation comes into play when the rotationally oscillating generator decelerates. This is done to achieve compensation for insufficient mechanical input power during deceleration of the rotationally oscillating generator. The electric power transmitted must be decreased to balance the insufficient mechanical input power.
10. ________ used to accomplish fast and unrestricted thyristor control in FACTS.
a) On-load tap changer can be
b) Off-load tap changer can be
c) On-load tap changer cannot be
d) Off-load tap changer cannot be
View Answer
Explanation: On-load tap changer can be used to accomplish fast and unrestricted thyristor control in FACTS. The regulating transformer employed in this concept can do the insertion of voltage from its appropriate taps. Also converters can be aptly configured to offer the desired voltage injection to compensate for the required unit. Thus voltage and phase angle regulation can be achieved in FACTS.
Sanfoundry Global Education & Learning Series – Flexible AC Transmission System (FACTS).
To practice all areas of Flexible AC Transmission System (FACTS), here is complete set of 1000+ Multiple Choice Questions and Answers.
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