Name of the University : Mahatma Gandhi University
Department : Electrical and Electronics Engineering
Degree : M.Tech
Subject Code/Name : MEEPS 201/Power System Control And Security
Sem : II
Website : mgu.ac.in
Document Type : Model Question Paper
Download Model/Sample Question Paper : https://www.pdfquestion.in/uploads/mgu.ac.in/5295-MEEPS%20201%20Power%20System%20Control%20and%20Security.doc
Power System Control & Security Question Paper :
M.TECH Degree Examination :
Model Question Paper :
Second semester :
Related : MGU Flexible Ac Transmission Systems M.Tech Model Question Paper : www.pdfquestion.in/5283.html
Branch: Electrical and Electronics Engineering;
Specialization: Power Systems
MEEPS 201 Power System Control And Security :
(2011 admission onwards)
[Regular/ Supplementary]
Time: Three hours
Maximum: 100 marks
Answer all questions
Each full question carries 25 marks :
1.(a) Explain the fundamentals of Automatic generation control in isolated power systems and also in interconnected power systems (13 marks)
(b) A small system consists of 4 identical 500 MVA generating units feeding a total load of 1,020 MW. The inertia constant H of each unit is 5 on 500 MVA base. The load varies by 1.5% for a 1% change in frequency.
When there is a sudden drop in load by 20 MW, (i)Determine the system block diagram with constants H and D expressed on 2,000 MVA base; (ii)Find the frequency deviation assuming that there is no speed governing action (12 marks)
Or
2. (a) Discuss with a block schematic diagram the implementation of AGC for one control area (13 marks)
(b) A power system has a total load of 1,260 MW at 60 Hz. The load varies by 1.5% for every 1% change in frequency (D=1.5). Find the steady state frequency deviation when a 60 MW load is suddenly tripped if
(i) there is no speed control;
(ii) the system has 240 MW of spinning reserve evenly spread among 500 MW of generation capacity with 5% regulation based on this capacity.
All other generators are operating with valves wide open. Assume that the effect of governor dead bands is such that only 80% of the governors respond to the reduction in system load. (12 marks)
3. (a) Explain the use of shunt reactors and shunt capacitors for voltage control and their
application to transmission and distribution system (13 marks)
(b) Explain the automatic voltage regulation of distribution systems (12 marks)
Or
4. (a) Explain operation of Thyristor controlled reactor(TCR) and Thyristor switched capacitor(TSC). (13 marks)
(b) Discuss the application of tap changing transformers to transmission systems (12 marks)
5. (a) Explain maximum likelihood criterion with an example (13 marks)
(b) Explain detection and identification of bad measurement (12 marks)
Or
6. (a) Explain state estimation (12 marks)
(b) What are the various aspects of power system security (13 marks)
7. (a) Explain SCADA (13 marks)
(b) Explain contingency analysis (12 marks)
Or
8. (a) Explain principles of Load Shedding (10 marks)
(b) Explain real time control of power system using a transition diagram during various modes of operation (15 marks) [4 x 25 = 100 marks]
M.Tech Degree Examination :
Model Question Paper : Second semester
Branch : Electrical and Electronics Engineering;
Specialization : Power Systems
MEEPS 202 : Power Quality (2011 admission onwards) [Regular/ Supplementary]
Time : Three hours
Maximum : 100 marks
Answer all questions
Each full question carries 25 marks
1. (a) What is meant by power quality? What are the basic power quality measures? (15 marks)
(b) What is voltage swell? How it differs from over voltage? Explain any two reasons for voltage swell? (10 marks)
Or
2. (a) What is meant by international power quality standards? Where are they used?
Explain IEEE standard corresponding to harmonics. (10 marks)
(b)Write briefly on
( i) Voltage flicker ( ii) CBEMA curve (iii) TIF and DIN (15 marks)
3. (a) With a block diagram explain hybrid UPS. Compare it with online and offline UPS (10 marks)
(b) Explain the impact of harmonic distortion on motors and transformers. (15 marks)
Or
4. (a) Explain the sources of harmonics. (15 marks)
(b) Draw the non-linear equivalent of a fluorescent lamp and estimate the current harmonics in fluorescent lamp circuits. (10 marks)
5. (a) What is the main source of causing resonance in power system? (10 marks)
(b) A 2000 kVA, 13.8kV/480 V transformer with leakage reactance of 5% feeding a bus containing two 500 HP ASD. A 750 kVAR star connected capacitor bank installed on the 480 V bus for power factor correction. Analyse the conditions for resonance and verify the result by another method? (15 marks)
Or
6. (a) A 5 MVA transformer is loaded to 4.5 MVA at a power factor of 0.82 lag. Calculate the leading kVAR necessary to correct the power factor to 0.95 lag and also the corresponding rating of the transformer ? (15 marks)
(b) Define SVC? What is the important role of SVC? (10 marks)
7. (a) Explain briefly about for the following harmonic filter.
(i)Active filters (ii)Passive filters (10 marks)
(b) Explain in detail about principles of operation and control methods of shunt active filter with neat schematic. (15 marks)
Or
8. (a) What are the typical wiring and grounding problems? What are the solutions applied for wiring and grounding problems (15 marks)
(b) Define Dynamic voltage restorer? What is the important role of DVR harmonic elimination? (10 marks) [4 x 25 = 100 marks]