Final Year Exam Diyala University 2011-2012 Subj. Power Systems Op. & Ctrl. Diyala College of Engineering 3rd Attempt 4th year classElectrical Power Engg. & Machines Dept. Time: 3 hrs. Date:

Note: Attempt Four Questions All Questions Carry Equal Marks

Q1. Derive the model of a governor with speed- droop characteristic and represent it by a block diagram?

Good Luck & All The Best Examiner: Mr. Dhrgham M.

Final Year Exam Diyala University 2011-2012 Subj. Power Systems Op. & Ctrl. Diyala College of Engineering 3rd Attempt 4th year classElectrical Power Engg. & Machines Dept. Time: 3 hrs. Date:

Note: Attempt Four Questions All Questions Carry Equal Marks

Q2. Sketch and explain the block schematic diagram of Automatic generation control (AGC) for two-area power system?

Good Luck & All The Best Examiner: Mr. Dhrgham M.

Final Year Exam Diyala University 2011-2012 Subj. Power Systems Op. & Ctrl. Diyala College of Engineering 3rd Attempt 4th year classElectrical Power Engg. & Machines Dept. Time: 3 hrs. Date:

Note: Attempt Four Questions All Questions Carry Equal Marks

Q3. The fuel-cost functions in $/h for three thermal plants are given by:

F1 = 350 + 7.20P1 + 0.004P12F2 = 500 + 7.30P2 + 0.0025P22F3 = 600 + 6.74P3 + 0.003P32

Neglecting line losses and generator limits, determine the optimal scheduling of generation for each and the total cost in $/h when the total load is 450 MW?

Good Luck & All The Best Examiner: Mr. Dhrgham M.

Final Year Exam Diyala University 2011-2012 Subj. Power Systems Op. & Ctrl. Diyala College of Engineering 3rd Attempt 4th year classElectrical Power Engg. & Machines Dept. Time: 3 hrs. Date:

Note: Attempt Four Questions All Questions Carry Equal Marks

Q4. Attemp A or B

A. Derive the swing equation that describes the rotor dynamics for a synchronous machine?

Good Luck & All The Best Examiner: Mr. Dhrgham M.

Final Year Exam Diyala University 2011-2012 Subj. Power Systems Op. & Ctrl. Diyala College of Engineering 3rd Attempt 4th year classElectrical Power Engg. & Machines Dept. Time: 3 hrs. Date:

Note: Attempt Four Questions All Questions Carry Equal Marks

B. Derive an expression to calculate the clearing angle and clearing time of a single machine connected to an infinite bus system through radial transmission line?

Good Luck & All The Best Examiner: Mr. Dhrgham M.

Final Year Exam Diyala University 2011-2012 Subj. Power Systems Op. & Ctrl. Diyala College of Engineering 3rd Attempt 4th year classElectrical Power Engg. & Machines Dept. Time: 3 hrs. Date:

Note: Attempt Four Questions All Questions Carry Equal Marks

Q5. The fuel cost function of two thermal power plant in $/h are :C1 = 320 +6.2P1 + 0.004P1

2

C2 = 200 + 6 P2 + 0.003 P22

Where P1 and P2 are in MW. Plant outputs are subject to the following limits in MW:50 ≤ P1≤ 250 , 50 ≤ P2≤ 350The per-unit system real power loss with generation expressed in per unit on a 100-MVA base is given by : PL = 0.0125P1

2 + 0.00625P22. The total load is 412.35 MW.

Determine the optimal dispatch of generation.

Good Luck & All The Best Examiner: Mr. Dhrgham M.

Final Year Exam Diyala University 2011-2012 Subj. Power Systems Op. & Ctrl. Diyala College of Engineering 3rd Attempt 4th year classElectrical Power Engg. & Machines Dept. Time: 3 hrs. Date:

Note: Attempt Four Questions All Questions Carry Equal Marks

Good Luck & All The Best Examiner: Mr. Dhrgham M.

Final Year Exam Diyala University 2011-2012 Subj. Power Systems Op. & Ctrl. Diyala College of Engineering 3rd Attempt 4th year classElectrical Power Engg. & Machines Dept. Time: 3 hrs. Date:

Note: Attempt Four Questions All Questions Carry Equal Marks

Good Luck & All The Best Examiner: Mr. Dhrgham M.

Final Year Exam Diyala University 2011-2012 Subj. Power Systems Op. & Ctrl. Diyala College of Engineering 3rd Attempt 4th year classElectrical Power Engg. & Machines Dept. Time: 3 hrs. Date:

Note: Attempt Four Questions All Questions Carry Equal Marks

Good Luck & All The Best Examiner: Mr. Dhrgham M.

Final Year Exam Diyala University 2011-2012 Subj. Power Systems Op. & Ctrl. Diyala College of Engineering 3rd Attempt 4th year classElectrical Power Engg. & Machines Dept. Time: 3 hrs. Date:

Note: Attempt Four Questions All Questions Carry Equal Marks

Good Luck & All The Best Examiner: Mr. Dhrgham M.