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EE2036 Flexible AC Transmission Systems


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Previous Year Question Papers

Normally previous year question papers are more important for finding which are the repeated questions and to concentrate on those question more for semester exam.
So provided some of the question papers for your reference.. 



Syllabus
 


EE2036                              FLEXIBLE AC TRANSMISSION SYSTEMS                            L T P C
                                                                                                                                             3 0 0 3
AIM:
To enhance the transmission capability of transmission system by shunt and series compensation using static controllers.

OBJECTIVES:
i.                    To understand the concept of flexible AC transmission and the associated problems.
ii.                  To review the static devices for series and shunt control.
iii.                To study the operation of controllers for enhancing the transmission capability.

UNIT I INTRODUCTION                                                                                                                  9
The concept of flexible AC transmission - reactive power control in electrical power transmission lines -uncompensated transmission line – series and shunt compensation. Overview of FACTS devices - Static Var Compensator (SVC) – Thyristor Switched Series capacitor (TCSC) – Unified Power Flow controller (UPFC) - Integrated Power Flow Controller (IPFC).

UNIT II STATIC VAR COMPENSATOR (SVC) AND APPLICATIONS                                            9
Voltage control by SVC – advantages of slope in dynamic characteristics – influence of SVC on system voltage. Applications - enhancement of transient stability – steady state power transfer – enhancement of power system damping – prevention of voltage instability. 

UNIT III THYRISTOR CONTROLLED SERIES CAPACITOR(TCSC)AND APPLICATIONS               9
Operation of the TCSC - different modes of operation – modeling of TCSC – variable reactance model – modeling for stability studies. Applications - improvement of the system stability limit – enhancement of system damping – voltage collapse prevention. 

UNIT IV EMERGING FACTS CONTROLLERS                                                                               9
Static Synchronous Compensator (STATCOM) – operating principle – V-I characteristics Unified Power Flow Controller (UPFC) – Principle of operation - modes of operation – applications – modeling of UPFC for power flow studies. 

UNIT V CO-ORDINATION OF FACTS CONTROLLERS                                                                9
FACTs Controller interactions – SVC–SVC interaction - co-ordination of multiple controllers using linear control techniques – Quantitative treatment of control
coordination.
TOTAL : 45 PERIODS
Prescribed books


TEXT BOOK:
1. Mohan Mathur, R., Rajiv. K. Varma, “Thyristor – Based Facts Controllers for
Electrical Transmission Systems”, IEEE press and John Wiley & Sons, Inc.
REFERENCES:
1. A.T.John, “Flexible AC Transmission System”, Institution of Electrical and Electronic Engineers(IEEE), 1999.
2. Narain G.Hingorani, Laszio. Gyugyl, “Understanding FACTS Concepts and Technology
of Flexible AC Transmission System”, Standard Publishers, Delhi 2001.


Important Questions for April -2016



All Unit Questions
                       
EE2036/Flexible AC Transmission systems        

1. Explain the various basic types of FACTS controllers in detail.  

2. Explain the working and characteristic of Thyristor Switched Series Capacitor 

3. Explain the reactive power compensation at the sending, midpoint and receiving ends of the transmission lines (DERIVATION)

4. Explain the operation of UPFC with vector diagrams.

5. Discuss the different advantages of slope in dynamic characteristics of SVC.

6. Explain about the performance of SVC in controlling voltage in a power system

7. Explain the different applications of TCSC

8. Briefly describe the way by which the transient stability is enhanced due to Static VAR  Compensator.

9. Explain the different modes of operation of TCSC,With a neat block diagram

10. Explain the principle of operation and VI characteristics of STATCOM with neat sketch.

11. Explain the basic operating principle and the control capability of UPFC.

12. Explain the operation of STATCOM with an aid of block diagram

13.  Explain the basic operating principle and the control capability of UPFC.

14.  Discuss in detail about SVC-SVC interaction

15.  Discuss the coordination procedure of multiple controllers using linear control techniques in detail

16.  Discuss Linear quadratic regulator based techniques, Global coordination using nonlinear constrained optimization., Control coordination using genetic algorithms in detail




Unit wise  Questions


UNIT – I

1. Describe briefly the load and system compensation schemes.
2. Explain the operation of UPFC with diagram.
3. Explain the reactive power compensation at the sending, mid-point and receiving ends of the transmission lines.
4. Explain the principle, working and characteristics of static VAR compensator with a neat circuit diagram.
5. Explain the working and characteristics of Thyristor switched series capacitor with a neat diagram.
6. Discuss briefly about the variation of the TCSC reactance with firing angle ‘alpha’.
7. Explain the V-I capability characteristics of single module TCSC.
8. Explain with neat circuit diagram about fixed capacitor-Thyristor controlled reactor.




UNIT – II

1. Explain the design of SVC voltage regulator. Also discuss the influence of SVC on system voltage
2. Discuss in detail the effect of SVC for the enhancement of transient stability.
3. Using a general schematic diagram, explain the three basic modes of SVC control in detail.
4. Explain the application of SVC for prevention of voltage instability.
5. How do you enhance the damping in power system using SVC
6. Explain the design of SVC voltage regulator and discuss the voltage control capability of SVC. What are the advantages of slope in dynamic characteristics of SVC?
7. Discuss in detail about the role of SVC in improving the stability limit and enhancing the power system damping
8. Describe the construction and operating characteristics of synchronous condensers.
9. Derive and explain the series and shunt compensation of symmetrical transmission lines.

UNIT – III

1. Explain the principle of operation of TCSC. Also discuss the different modes of TCSC.
2. Explain the effect of TCSC for the enhancement of system damping.
3. Explain the need for variable and fixed series compensation schemes.
4. Describe the variable reactance model of TCSC.
5. Explain the different modes of operation of TCSC.
6. Describe the modeling of TCSC for load flow study.
7. Explain the working, characteristics and operating modes of variable reactance model of thyristor controlled series capacitor.
8. Explain in detail the applications of thyristor controlled series capacitor.
9. How TCSC is used for the improvement of the stability of a system.

UNIT – IV

1. With a neat sketch, explain the implementation of UPFC.
2. Explain the working of STATCOM with a neat sketch. In what way it differs from SVC?
3. Explain the operation of STATCOM with its V-I characteristics.
4. Explain the performance of VSC based STATCOM.
5. Describe the modeling of UPFC for power flow and transient stability studies.
6. Explain the basic principle and control capability of unified power flow controller.
7. Explain the power transfer capability of UPFC and compare its capabilities with other FACTS controllers.
8. Describe the construction of UPFC with a block diagram and its characteristics with phasor diagrams.
9. Explain the power flow control and oscillation damping in the two area system using UPFC.

UNIT – V

1. Using linear control techniques, explain the co-ordination of multiple controllers.
2. Explain the controller interactions between multiple SVCs (SVC-SVC) in a large power system.
3. Explain the FACTS controller interactions with similar, dissimilar HVDC controller links.
4. Describe the genetic algorithm based control co-ordination of FACTS controllers.
5. Explain the co-ordination of multiple controllers using genetic algorithm. 


E books  For   Facts 


"Understanding FACTS Concepts" by "Narain G.HIngorani" Download link


"Flexible Ac Transmission System" by "Pal" Download link


"HVDC and FACTS Controllers" by "Vijay K.Sood"  Download link


"Flexible Power Transmission" by "J.Arrillaga" Download link


"Facts Controllers in Power Transmission and Distribution" by "K.R.Padiyar" Download link


"Thyristor Based Facts Controllers for Electrical Transmission System" by "R.Mohan Mathur" Download link
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