# Power system operation and control 7th ND12 EE2401

B.E/B. Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2012.
B.E Electrical and Electronics Engineering
Seventh Semester
Ee 2401/ee 71/10133 ee 701- power system operation and control
(Regulation 2008)

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Part-A

1)Define the term "maximum demand".
3)What are the types of automatic load frequency control for interconnected power system?
5)What are the different types of reactive power compensation?
6)Define "Booster transformer"?
7)What is incremental cost criterion?
8)Name some thermal constraints in unit commitment problem?
10)Define network topology in a power system?

Part-B

11) a) i) A generating station has the following daily load cycle.
Time(hrs) 0-6 6-10 10-12 12-16 16-20 20-24
Load(MW) 40 50 60 50 70 40
Draw the load curve and find
1)Max demand
2)Units generated/day
ii)Explain the types of load forecasting?
or
b) Explain the important objectives of powe system and various control strategies during its operation.

12) a) With a neat block diagram,explain the single area load frequency control system.
or
b) i) Discuss the integration of economic dispatch control with automatic generation control.
ii) Derive an expression for load sharing between two alternators.What are the effects of fuel supply and change of excitation?

13) a)i) Discuss the relation between voltage and reactive power at a node.
ii) Explain briefly the reactive power requirement for control of voltage in long radial lines.
or
b) Explain the methods of voltage control in a transmission system
i) By transformer tap setting
ii)By Booster transformer.

14) a) i)Explain the lambda iteration method for finding the solution of economic dispatch including transmission losses with a neat flowchart.
ii) A generating unit has two 200 MW units whose input cost data is as follows :
F1=0.004P1^2+2.0P1+80 Rs/hr
F2=0.006P2^2+1.5P2+100 rs/ hr
For a total load of 250MW ,find the load dispatch between the two units for economic operation.
or
b)i)EXPLAIN the priority list method for unit commitment problem.
ii)Define
1)Minimum up time
2)Minimum down time
3) Spinning reserve.

15.a) Discuss the functions of SCADA in power system operations.
or
b)Enumerate the various operating states and the control strategies of a power system.