Anna University Chennai 2010-7th Sem B.E Electrical and Electronics Engineering /B.Tech emr/emr , ester, , EE 1401 - POWER SYSTEM OPERATION AND CONTROL - Question Paper

Part-A
(10*2=20)
1. Define the term "diversity factor".
2. What do you mean by spinning reserve?
3. Define per unit droop.
4. Write down the formula for area control fault of 2 area system.
5. What is stability compensation?
6. List the methods of voltage control?
7. Write a few constraints in unit commitment issue.
8. What is meant by incremental cost curve?
9. Define state estimation.
10. Mention the uses of SCADA in power system.


Part-B
(5*16=80)
11.(a) discuss the subsequent : (16)
(i) Hot reserve and cold reserve
(ii) Load curve and load duration curve
(iii) Governor control
(iv) Security control
Or
11.(b) A generating station has the subsequent daily load cycle: (16)
Time (hours): 0-6 6-8 8-12 12-14 14-18 18-20 20-24
Load (MW): 45 35 75 20 80 25 50
(i) Draw the daily load curve
(ii) Draw the load duration curve
(iii) Calculate load factor
(iv) Calculate plant capacity factor if the capacity of the plant is 120MW.

12.(a) Develop the model of single control area and find its block diagram representation. discuss the salient features under static and dynamic conditions. (16)
Or
12.(b) 2 synchronous generators operating in parallel. Their capacities are 700MW and 600MW. The droop characteristics of their governor are 4% and 5% from no load to full load. Assuming that the generators are operating at 60 Hz at no load, how would be a load of 800MW shared ranging from them. What will be the system frequency at this load? presume free governor action. (16)

13.(a)(i) explain generation and absorption of reactive power. (8)
(ii) discuss how voltage control can be affected by injection of reactive power. (8)
Or
13.(b)(i) discuss the operation of on-load tap changing transformer. (8)
(ii) A 414 KV line is fed through 132/415 KV transformer from a constant 132 KV supply. At the load end of the line, the voltage is decreased by a different transformer of 415/132 KV. The total impedance of line is (20+j40) ohms. Both transformers are equipped with tap-changing. The product of the 2 off-nominal setting is unity. The load on the system is 250 MW at 0.8 p.f. lagging. compute the settings of the tap changer needed to maintain the voltage at 132KV. (8)

14.(a) State the unit commitment issue. discuss priority list method of unit commitment issue in detail. (16)
Or
14.(b) With a neat flow chart discuss the iterative algorithm for solving the economic dispatch formula of N-bus power system taking into account the effects of system losses. (16)

15.(a) explain the different functions of energy control centre. (16)
Or
15. (b) discuss the operating states of a power system in the security perspective with an example. (16)

Earning:   Approval pending.