ROEVER COLLEGE OF ENGINEERING AND TECHNOLOGY

PERAMBALUR-621 212

DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING

CIA TEST 2Year / Sem: IV / VII

Time : 1.30 hrsSubject : EE1401 Power System Operation & Control Max Marks : 50

Date : 24 -09-13 (FN)

Reg. No: PART-A (10*2=20) Answer all the questions1. List the constraints in unit commitment problem.2. What is meant by incremental cost curve?3. What is meant by priority list method?

4. Write the relationship between and power demand when the cost curve is given. 5. What are the functions of SCADA?

6. What is participation factor with respect to economic load dispatch?

7. Write the condition for the optimal power dispatch in a lossless system.

8. Write importance of state estimation in power system.

9. What are the major functions that are carried out in an operation control center?10. What do you understand by security constraints?

PART-B (3*10=30 )11. a) In a power system having two units, the loss co -efficient are

The incremental production cost of thr units are

, Find the generation schedule for = 20 and 25.Find also the change in

transmission losses between the two schedules.(10)

(Or) b). The fuel cost function for the three thermal plants are given by (10) Where Pg1, Pg2, Pg3 are in MW. Find the optimum scheduling and the total cost per hr

for a total load of 975 MW with the following generator limits :

12 . a) i) Illustrate SCADA with the typical schematic.(5)

ii) What are the functions of a modern power system control centre? (5)

(Or) b) Draw the power system state transition diagram and explain the various states of the system and control actions to be taken to make the system Secure.(10)13. a) i) What is unit commitment problem? Discuss the constraint that are to be accounted in

unit commitment problem.(5) ii) Explain the priority ordering method of committing units. State merits amd limitation of

this method.(5)(Or) b) State the unit commitment problem.With the help of a flowchart explain forward dynamic

programmi ng solution method of unit commitment problem.(10)Subject in charge