This set of FACTS Multiple Choice Questions & Answers (MCQs) focuses on “AC Transmission Interconnections”.
1. Transmission System has only one role, i.e. to deliver/transfer power.
a) True
b) False
View Answer
Explanation: Other than the main purpose to transfer/delivery power from the source towards load centers, transmission network also aims at technologically pooling power plants and load centers such to minimize net power generation capacity and fuel cost. For this transmission system employ interconnections taking into consideration diversity of loads, availability of sources, fuel price, and etc. This is done to ultimately supply electricity to the load centers/consumers at the minimum possible cost without compromising reliability.
2. Which one between the following is better?
a) Transmission system with no interconnection
b) Interconnected transmission system
c) Any system
d) No system
View Answer
Explanation: Obviously Interconnected transmission system is better than stand-alone transmission system with no interconnection. Interconnected transmission system plays a key role in a deregulated electric service environment, wherein an effective electric grid is vital to the competitive environment of reliable electric service. Modern-day design of Power System aims at utilizing maximum potential of transmission interconnections.
3. Basically FACTS is nothing but an apt application of thyristors and other power electronics devices in the field of electrical transmission system.
a) True
b) False
View Answer
Explanation: After the smart invention of thyristor, we found its utility in building several power electronic devices like converters, controllers, etc. Its inherent property of controlled switching by dint of its triggering and its smooth operation has made the FACTS controllers and compensators available to give flexibility to electric power transmission system, in terms of smooth and accurate control of reactive power and ultimate maintenance of a good voltage profile in the power system. Thus, we can say that basically FACTS is nothing but an apt application of thyristors and other power electronics devices in the field of electrical transmission system.
4. In electrical power system, unlike FACTS, traditional methods of managing the active and reactive power include fixed and mechanically switched shunt and series capacitors, reactors and synchronous generators.
a) True
b) False
View Answer
Explanation: It is true that in electrical power system, unlike FACTS, traditional methods of managing the active and reactive power include fixed and mechanically switched shunt and series capacitors, reactors and synchronous generators. On the other hand, FACTS is a power-electronics based system. Therefore, instead of large rotating machines being used as synchronous condensers or mechanically switched capacitor banks to compensate for reactive power; FACTS employ static equipment, VAR compensators controlled by power electronic devices like thyristors for making up or taking away reactive power.
5. In the transmission arena of electrical power system, application of power electronics comprises of ________
a) Only HVDC
b) Only FACTS
c) HVDC and FACTS
d) AC
View Answer
Explanation: In the transmission arena of electrical power system, application of power electronics comprises of High-Voltage Direct Current (HVDC) power transmission and Flexible AC Transmission System (FACTS). HVDC involves conversion of ac to dc at one end and conversion of dc to ac at the other end; in the range of a hundred megawatts to a few thousand megawatts. ‘FACTS’ employs conversion and/or switching power electronics, in the range of a few tens to a few hundred megawatts.
6. The transmission system is better controlled by FACTS controllers than the mechanical switching devices.
a) True
b) False
View Answer
Explanation: IT is true that the transmission system is better controlled by FACTS controllers than the mechanical switching devices. The mechanical switching devices used for control of transmission systems lack in high-speed control. Also control through these mechanical devices cannot be initiated frequently as they tend to wear out very quickly compared to static devices. For both dynamic and steady-state operation, the transmission system is better controlled by FACTS Controllers.
7. With FACTS Controllers transmission system is able to carry power closer to the ________ of transmission lines.
a) thermal rating
b) voltage rating
c) current rating
d) power rating
View Answer
Explanation: With FACTS Controllers transmission system is able to carry power closer to the thermal rating of transmission lines. Actually, the power/current/voltage carrying capacity of any electrical device is limited by its thermal rating. To maintain the required system reliability, mechanical switching devices lower the useable transmission capacity, unlike FACTS Controllers.
8. The reliable operation of transmission systems is obtained through control of __________
a) only series impedance
b) only shunt impedance
c) only phase angle
d) series impedance, shunt impedance, phase angle, etc.
View Answer
Explanation: The reliable operation of transmission systems is obtained through control of its interrelated parameters like series impedance, shunt impedance, current, voltage, phase angle, the damping of oscillations at various frequencies below the rated frequency, etc. For both dynamic and steady-state operation, the parameters of the transmission system should be controlled.
9. In FACTS technology, the controller employed in the transmission system is always a single high-power Controller.
a) True
b) False
View Answer
Explanation: In FACTS technology, the controller employed in the transmission system is NOT a single high-power Controller; rather a collection of Controllers. These Controllers can work either individually or in coordination with others to control one or more of the parameters in the transmission system. A properly designed FACTS Controller can truly overcome the dynamic and steady state limitations of a selected transmission line or a corridor of a system.
10. ________ is the basic element for high rated power-electronic Controllers, employed in transmission system.
a) transistor
b) resistance
c) thermister
d) thyristor
View Answer
Explanation: Basically, transistor is the ultimate basic element of any microelectronic chip/circuit. On the other hand, high-power transistor or thyristor forms the basis for designing any high-power electronic Controllers. Hence is the basic element for high rated power-electronic Controllers, employed in transmission system.
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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