Important RGPV Question
EX- 802 (A) Power Quality Problems And Mitigation Techniques
VIII Sem, EX
UNIT 1-Introduction To Power Quality
Q.1) Briefly explain the Causes of power quality disturbances.
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Q.2) What are the major Power Quality issues? Explain in detail.
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Q.3) Define Power Quality. Explain the reasons for increased concern in power quality.
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Q.4) Discuss the general classes of power quality problems. What are the various solutions for Power quality improvement at end user level.
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Q.5) Define the following terms
i) Sag and Swell
ii) Voltage surge
iii) Flicker
iv) Distortion factor
v) Fast Fourier transforms
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Q.6) Explain in detail how the reduction in no of faults in a power system network will improve the power quality.
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Q.7) Name the four mitigation methods used in power system network to improve the power quality.
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UNIT 2-Loads That Causes Power Quality Problems
Q.1) Write short notes on Classification and working of passive series compensation.
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Q.2) Briefly explain the Operation of DSTATCOM with neat sketch.
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Q.3) What are the power quality problems due to reactive power component of currents?
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Q.4) What are the series and shunt compensators compare their role for power quality improvement?
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Q.5) What are series and shunt compensators? Compare their role for power quality improvement.
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UNIT 3-Introduction To Unified Power Quality Compensators
Q.1) What are the advantages of UPQC?
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Q.2) How the UPQC are classified? Explain briefly.
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Q.3) Explain about the fundamentals of wave form distortion.
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Q.4) Write the differences between UPQC and DSTATCOM in operation.
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Q.5) What do you understand by unified power quality compensator, discuss their classifications, working and operations?
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Q.6) Discuss the principle of phase angle compensation. What is a phase shifter? Discuss the measures adopted to minimize the frequency and duration of outages in distribution systems.
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UNIT 4-Voltage Sags And Interruption
Q.1) Discuss about the sources of sags and interruption and Describe the mitigation of voltage sag.
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Q.2) Explain how the voltage sag performance is estimated?
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Q.3) Mention the harmonic sources from industrial loads and commercial loads.
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Q.4) Describe the production of harmonics from commercial loads. How it is different from industrial loads.
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Q.5) How harmonic sources can be modeled? Explain.
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Q.6) What is the need for estimating sag performance? Discuss in details about sag performance evaluation indices.
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Q.7) What are the various causes of voltage and current harmonics? Explain individual harmonic distortion and total harmonic distortion.
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Q.8) How can utilities deal with problems related to capacitor switching transients? Explain.
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Q.9) Differentiate between long interruption and short interruption of the power system networks.
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Q.10) Explain the mitigation of voltage sag in case of AC drive and adjustable DC drives.
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Q.11) Distinguish between voltage sag and under voltages. Briefly discuss the techniques used for sag or dip reduction. Distinguish between voltage swell and over voltages.
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UNIT 5-Applied Harmonics
Q.1) Describe the concept and working of active filters.
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Q.2) What are active and passive power filters. Distinguish between voltage flicker and voltage fluctuations. What are the main reasons of these problems.
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Extra Questions-
Q.1) Define the following terms:
i) Harmonics
ii) Harmonic indices
iii) Crest factor
iv) TDD
v) THD
vi) Inter harmonics.
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Q.2) Write short notes on any two of the following:
a) Non linear loads causing power quality problems.
b) Sources of transient over voltages.
c) What are the power quality problems a UPQC can
mitigate?
d) Explain the operation of harmonic analyzer.
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Q.3) Explain the following:
i) DSTATCOM
ii) Power quality evaluation procedure
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Q.4) Explain the following:
i) Shunt active and Passive filters
ii) Active series compensators
iii) Harmonic reduction and standards
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Q.5) Write short notes on any two:
a) Unified power quality conditioner UPQC
b) Voltage and phase angle imbalance
c) Harmonic reduction and standards
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— Best of Luck for Exam —
