Name of the College : Mahatma Gandhi University
Department : Electrical and Electronics Engineering
Subject Code/Name : MEEPE 105-3/ Power Quality
Sem : I
Website : mgu.ac.in
Document Type : Model Question Paper
Download Model/Sample Question Paper :
I : https://www.pdfquestion.in/uploads/mgu.ac.in/5050-1-MEEPE%20105-3%20Power%20Quality%20-1.pdf
II : https://www.pdfquestion.in/uploads/mgu.ac.in/5050-2-MEEPE%20105-3%20Power%20Quality%20-2.pdf
MGU Power Quality Model Question Paper
M.TECH Degree Examination :
Model Question
First Semester
Related : MGU MEEPE103 Power Converters M.Tech Model Question Paper : www.pdfquestion.in/5049.html
Paper – I
Branch: Electrical and Electronics Engineering;
Specialization: Power Systems
MEEPE 105-3 Power Quality
(2013 admission onwards)
[Regular/ Supplementary]
Time: Three hours
Maximum: 100 marks
Answer all questions :
1. (i) (a) Explain the various types of power quality disturbances and its causes? (12)
(b) Explain power acceptability curves? (8)
(c) Explain power quality standards? (5)
OR
(ii) (a) Write short notes about THD, TIF, DIN and C-message weights? (8)
(b) Explain the causes, effects and cures for transient disturbances? (12)
(c) Explain power quality? (5)
2. (i) (a) Explain the effects of harmonics on power system equipments and load? (8)
(b) Write short notes about triplex harmonics? (5)
(c) Explain the modeling of power system under non-sinusoidal conditions? (12)
OR
(ii) (a) How harmonics are produced and what are the harmonic introducing devices? (10)
(b)Explain IHD, TDD, true rms, displacement power factor and distortion power? (15)
3. (i) (a) Explain how power factor can be improved using STATCOM? (12)
(b) Explain passive compensation? (8)
(c) What are the drawbacks of poor power factor? (5)
OR
(ii) (a) Explain power factor correction in dc-dc boast converter? (8)
(b) Explain 3-phase APFC and its control techniques? (12)
(c) Write short notes about impedance scan analysis? (5)
4. (i) (a) Explain d-q domain control for harmonic filtering using shunt active filter? (15)
(b) Explain typical grounding and wiring problem with solutions? (10)
OR
(ii) (a) Explain DVR for sag, swell and flicker problems? (10)
(b) Explain UPS, CVT and series active filter? (15)
Paper – II
M.TECH DEGREE EXAMINATION :
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]
Syllabus
Module 1 :
Introduction-power quality-voltage quality-overview of power quality phenomena-classification of power quality issues-power quality measures and standards-THD-TIF-DIN-C-message weights-flicker factor-transient phenomena-occurrence of power quality problems-power acceptability curves-IEEE guides, standards and recommended practices.
Module 2 :
Harmonics-individual and total harmonic distortion-RMS value of a harmonic waveform-triplex harmonics-important harmonic introducing devices-SMPS-Three phase power converters-arcing devices-saturable devices-harmonic distortion of fluorescent lamps-effect of power system harmonics on power system equipment and loads.