# Power System Dynamics 2nd June2012 PS9222

M.E. DEGREE EXAMINATION, JUNE 2012.
Second semester
Power System Engineering
PS 9222/ 236206 / PS 9222 - POWER SYSTEM DYNAMICS
(Regulation 2009)

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PART A—(10 × 2 = 20 marks)

1. Draw the schematic diagram of 3 phase synchronous machine.
2. What are the assumptions made in developing the mathematical model of a synchronous machine?
3. List out the elements of an existing system.
4. What is the role of governor in hydraulic turbine?
5. Classify stability?
6. What is an infinite bus?
7. What is the role of AVR in maintaining the stability of interconnected power system?
8. What is the basic function of power system stabilizer?
9. Differentiate between steady state and transient stability.
10. Define “Stabilizer gain”.

PART B—(5 × 16 = 80 marks)

11. (a) Draw the stator and rotor circuits of a synchronous machine and derive the basic equations of stator and rotor of synchronous machine. Draw the necessary illustrations also. (16)
Or
(b) Explain the performance of synchronous machines under steady state conditions by applying the per unit equations. (16)

12. (a) Draw the functional block diagram of excitation system and explain the elements of excitation system in detail. Also explain various control and protective schemes of excitation system. (16)
Or
(b) Explain the mathematical model of the following:
(i) Governor for hydraulic turbine. (8)
(ii) Single reheat tandem-compound steam turbine. (8)

13. (a) (i) Explain the small signal stability of single machine infinite bus system with classical generator model. Derive all the necessary equations. (10)
(ii) Discuss the relationship between Eigen properties and transfer function.(6)
Or
(b) (i) Derive the following of field circuit dynamics
(1) Synchronous machine equations
(2) Network equations. (8)
(ii) Explain the block diagram representation of small signal model of single machine infinite bus system with K constants. (8)

14. (a) (i) Draw and explain the block diagram representation with exciter and AVR.(8)
(ii) Write a detailed technical note on the small stability improvement methods.(8)
Or
(b) (i) Write a detailed technical note on the small signal stability of multi machine system. (8)
(ii) Explain the block diagram of power system stabilizer with AVR in detail.(8)

15. (a) Draw the schematic diagram of P omega stabilizer and delta omega stabilizer and compare their properties and operation in detail. (16)
Or
(b) Explain the following: