(FACTS) Flexible AC Transmission Systems QUESTIONS BANK

FACTS QUESTIONS BANK

UNIT:-1 FACTS CONCEPTS

1. Discuss the power flow and dynamic stability aspects of simple power system.

2. What are the problems associated with the present day power systems and explain how facts controllers can provide the solutions.

3. a) Do you think FACTS technology provide solutions to the constraints of today power system? Discuss.

b) What are the benefits from the FACTS controllers?

4. What are the constraint that limits the power flow and discuss the ways to overcome these limits. What are the benefits from the FACTS controllers?

5. Discuss the power flow and dynamic stability aspects of simple power system. What are the benefits of FACTS controllers?

6.  What are the basic types of FACTS controllers, give a brief description about them.

7. Write notes on the following:

i) Different types of FACTS Controllers. ii) SSR characteristics of TCSC.

UNIT:-2 VOLTAGE SOURCE CONVERTER

1.Draw the diagram of one phase lag of inverter with turn off and turn on devices and explain the operation of inverter through four quadrants with relevant wave forms and phasor diagrams.

2. Explain the operation of 3-phase full wave voltage source bridge converter with

relevant waveforms.

3. a) Explain the transformer connections for a 12-pulse operation of a voltage source converter.

b) What are the advantages and disadvantages of current sourced converters over voltage sourced converters.

4. Draw the diagram of one phase lag of inverter with turn off and turn on devices and explain the operation of inverter through four quadrants with relevant wave forms and phasor diagrams.

5.a) How do you classify the FACTS controllers?

b) Compare voltage source converters with current source converters.

6. Discuss the basic concept of voltage source converter and current source converter and compare their performance.

7. Explain the operation of 3-level voltage sourced converter in detail.

UNIT:-3 STATIC SHUNT CAPACITORS

1.Describe the principle of operation of FC-TCR type static var compensator with suitable control scheme.

2.Explain the operation of voltage sourced type static var generator with appropriate control scheme.

3. Derive an equation for current through Thyristor controlled reactor.

4. Explain the necessity of shunt compensation for

i) Midpoint voltage regulation.

ii) Prevention of voltage instability.

5. Explain the necessity of short compensation from the view point of

i. Midpoint voltage regulation

ii. Prevention of voltage in stability

iii. Improvement of transient stability.

6. Derive an equation for current through Thyristor controlled reactor.

7. Discuss the necessity of shunt compensation? Discuss its objectives in detail.

UNIT:-4 SVC and STATCOM

1. Compare the dynamic performance of STATCOM and SVC from the

i) Transient stability. ii) Response time. iii) Exchange of real power point of view.

2. Give detailed comparison between SVC & STATCOM in enhancing the dynamic performance of power system.

3.a) Explain different methods of controllable VAR generation.

b) Discuss the hybrid VAR generators.

4. Explain the different methods of controllable VAR generation. And also discuss about hybrid VAR generators.

5. Compare the dynamic performance of STATCOM and SVC from the

i) Transient stability.

ii) Response time.

iii) Exchange of real power point of view.

6. Give detailed comparison between SVC & STATCOM in enhancing the dynamic performance of power system.

7. Discuss the principle of operation of FC-TCR SVC with appropriate control scheme.

8. Describe the principle of operation of STATCOM with appropriate control scheme

UNIT:-5 STATIC SERIES COMPENSATION

1.What are the various objectives of series compensation? Explain them in detail.

2. What are the objectives of series compensation and show that how it can improve transient stability and voltage stability of power system

3. Discuss the concept of series capacitive compensation in transmission line. What is its impact on a power system? [12]

4. What are the various objectives of series compensation? Explain them in detail.

5. What are the objectives of series compensation and show that how it can improve transient stability and voltage stability of power system.

6. Give the concept of series capacitive compensation. And explain its impact on transient stability and power oscillation damping.

7.Draw the characteristics of Thyristor Controlled series capacitor and explain the operation of TCSC with relevant wave forms.

8. Explain the basic operation of GCSC, TSSC and TCSC devices.

9. What are the various objectives of series compensation? Explain them in detail.

7. Discuss the principle of operation and the characteristics of a Thyristor controlled reactor.

8. Draw the characteristics of Thyristor Controlled series capacitor and explain the operation of TCSC with relevant wave forms.

9. Explain the basic operation of GCSC, TSSC and TCSC devices.

10. Discuss the steady state V-I characteristics of SVC and STATCOM and their

dynamic performance.

11. Write notes on the following

a) Thyristor switched series capacitor (TSSC) b) Thyristor controlled series capacitor (TCSC).

12. Write notes on the following.

i) STATCOM ii) TCSC.

13. Write notes on the following:

i) Different types of FACTS Controllers. ii) SSR characteristics of TCSC

14. Write notes on the following

i) Thyristor controlled series capacitor. ii) Hybrid-var generators. iii) Multilevel inverter