GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII (NEW) EXAMINATION — WINTER 2017
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Subject Code: 2170906 Date: 02/11/2017
Subject Name: Advanced Power Electronics(Departmental Elective - II)
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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MARKS
Q.1 (a) Differentiate multi pulse converter with multi-level converter. 03
(b) Compare switching voltage regulator with linear voltage regulator. 04
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(c) Explain in brief Static VAR Compensator (SVC). Compare it with 07 STATCOM.
Q.2 (a) State important advantages, disadvantages and applications of SMPS. 03
(b) Discuss design criterion of SMPS. 04
(c) Discuss operation of Flyback converter. Draw its circuit diagram and 07 waveforms.
OR
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(c) Discuss operation of Forward converter. Draw its circuit diagram and 07 waveforms.
Q.3 (a) What is the need of resonant converters? Give its classifications. 03
(b) Discuss need of multilevel inverter. Mention various topology of 04 multilevel inverter.
(c) Discuss operation of series load resonant DC to DC converter 07
OR
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Q.3 (a) Compare zero voltage switching (ZVS) and zero current switching 03 (ZCS) resonant converter:
(b) Explain concept of multilevel inverter. 04
(c) Discuss operation of parallel load resonant DC to DC converter 07
Q.4 (a) Discuss star/delta phase shifting transformer with Phasor diagram. 03
(b) Discuss concept of multi pulse converter. Mention its advantages, 04 limitations and applications.
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(c) Discuss operation of diode clamped multilevel inverter with neat 07 circuit diagram and waveforms.
OR
Q.4 (a) Give classification and applications of phase shifting transformer. 03
(b) Compare 12 pulse and 18 pulse converter based on its harmonic 04 analysis.
(c) Discuss operation of five level flying capacitor multilevel inverter 07 with neat circuit diagram and waveforms.
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Q.5 (a) Draw schematic diagram of Monopolar, Bipolar and Homopolar link. 03
(b) Discuss control of HVDC system. 04
(c) Discuss principle of shunt compensation. Explain operation of fixed 07 capacitor- thyristors controlled reactor.
OR
Q.5 (a) Draw block diagram of HVDC transmission system. Mention 03 equipment required for HVDC system.
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(c) Discuss principle of series compensation. Explain operation of static 07 synchronous series compensator (SSSC).
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