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M.E. DEGREE EXAMIATIO, JUE 2012.

Second semester

Power System Engineering

PS 9222/ 236206 / PS 9222 — POWER SYSTEM DYAMICS

(Regulation 2009)

Time: Three hours Maximum: 100 marks

Answer ALL the Questions

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)

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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)

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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:

(i) Phase lead compensation (8)

(ii) Excitation control design. (8)