This set of FACTS Multiple Choice Questions & Answers (MCQs) focuses on “Compensation Techniques – Set 2”.
1. A FACTS converter can deliver reactive power within its ________
a) MVA capacity
b) current capacity
c) voltage capacity
d) power factor capacity
View Answer
Explanation: A FACTS converter can deliver reactive power within its MVA capacity. Its absorption of reactive power is also within its MVA capacity. Thus a FACTS controller can deliver or absorb reactive power within its MVA capacity.
2. Generally ________ is regarded as to contain the shunt-connected, thyristor-controlled reactors or thyristor-switched capacitors or their combinations.
a) SVG
b) BESS
c) TCBR
d) SMES
View Answer
Explanation: Generally SVG is regarded as to contain the shunt-connected, thyristor-controlled reactors or thyristor-switched capacitors or their combinations. It encapsulates any reactive power source that can work as reactive shunt compensator with the application of appropriate controls. It can meet specific or multipurpose compensation objectives.
3. Thyristor switches without firing angle control are never used.
a) True
b) False
View Answer
Explanation: Thyristor switches without firing angle control are used in FACTS. Actually thyristors with firing angle control or without firing angle control find applications as per the respective requirements of the design. Thyristor switches without firing angle control are utilized to achieve lower cost and losses, but without a continuous control.
4. Without any firing angle controls thyristors can achieve the step changes in the reactive power consumed from the system.
a) True
b) False
View Answer
Explanation: Without any firing angle controls thyristors can achieve the step changes in the reactive power consumed from the system. It is achieved by full- or zero-conduction operation of the thyristor associated. Thyristor switches without firing angle control are in fact without any continuous control.
5. For computation or analysis of transmission system, percent value system is preferentially used than p.u. system.
a) True
b) False
View Answer
Explanation: For computation or analysis of transmission system, p.u. system is preferentially used than percent value. P.U. denotes per unit system. Unlike in percent value systems, p.u. system paves the way for easy calculation and co-relation among the various system parameters.
6. Computation or analysis of compensation techniques of FACTS transmission system can be carried out in p.u. system.
a) True
b) False
View Answer
Explanation: Computation or analysis of compensation techniques of FACTS transmission system can be carried out in p.u. system. In p.u. system two parameters are arbitrarily chosen as base values. Generally power and voltage of any system is assumed for base values.
7. In p.u. system all parameters are arbitrarily chosen as base values.
a) True
b) False
View Answer
Explanation: In p.u. system all parameters are NOT arbitrarily chosen as base values. The parameters power, impedance can be expressed in terms of voltage and current. So choosing any two parameters as base values will lead to finding of the rest parameters in their respective base values.
8. In analyzing a transmission line with requisite compensation, p.u. concept cannot be applied for 3 phase configuration.
a) True
b) False
View Answer
Explanation: In analyzing a transmission line with requisite compensation, p.u. concept can be applied for 3 phase configuration. It can also be applied for 1 phase configuration as well. It makes the computation easy.
9. Transmission angle control is NOT applied to damp power oscillations.
a) True
b) False
View Answer
Explanation: Transmission angle control can be applied to damp power oscillations. To achieve damping of power oscillation is the active power flow in the transmission line is varied. This approach counteracts the accelerating and decelerating swings arising from the disturbed units of the power system.
10. Compensation techniques demand compensation for excess mechanical input power when the rotationally oscillating generator accelerates.
a) True
b) False
View Answer
Explanation: Compensation techniques demand compensation for excess mechanical input power when the rotationally oscillating generator accelerates. Actually the acceleration of the rotationally oscillating generator causes the power angle to increase. Therefore, the electric power transmitted must be increased to balance the excess mechanical input power.
11. Compensation techniques do not demand compensation for insufficient mechanical input power when the rotationally oscillating generator decelerates.
a) True
b) False
View Answer
Explanation: Compensation techniques do demand compensation for insufficient mechanical input power when the rotationally oscillating generator decelerates. Actually the deceleration of the rotationally oscillating generator causes the power angle to decrease. Therefore, the electric power transmitted must be decreased to balance the insufficient mechanical input power.
12. The conventional on load tap changer can be used to accomplish fast and unrestricted thyristor control in FACTS.
a) True
b) False
View Answer
Explanation: The conventional on load tap changer can be used to accomplish fast and unrestricted thyristor control in FACTS. 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.
13. Without proper compensation techniques, an increase in real power transmission will certainly result in an increase of reactive power demand at the end-voltage generators.
a) True
b) False
View Answer
Explanation: Without proper compensation techniques, an increase in real power transmission will certainly result in an increase of reactive power demand at the end-voltage generators. This will, in turn, lead to an increase in voltage variation along the transmission line. Thus adequate compensation is required for proper flow of reactive and real power.
14. Transmitted real power through transmission power system is a function of the transmission line impedance.
a) True
b) False
View Answer
Explanation: Transmitted real power through transmission power system is a function of the transmission line impedance. It also depends on the magnitudes of both sending-end and receiving- end voltages. Also the phase angle between these sending-end voltage and receiving-end voltage govern the transmitted real power through transmission power system.
15. Proper compensation techniques cause an increase in reactive power demand at the end-voltage bus system with an increase of real power transmission.
a) True
b) False
View Answer
Explanation: Proper compensation techniques do not cause an increase in reactive power demand at the end-voltage bus system with an increase of real power transmission. Proper compensation techniques focus on the changing reactive line power and accordingly compensates as per the design. Thus the voltage variation along the transmission line is controlled.
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