GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII (NEW) EXAMINATION - WINTER 2018
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Subject Code: 2170906 Date: 15/11/2018
Subject Name: Advanced Power Electronics
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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Q.1 (a) Compare buck, boost and buck-boost converter with reference to technical 03 parameters.
(b) Write the advantages of resonance converter as compared to PWM converter. 04
(c) Illustrate the push pull converter with neat circuit diagram & waveform and 07 derive the equation of output voltage in terms of input voltage & duty cycle.
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Q.2 (a) Define duty cycle and write its importance. 03
(b) Differentiate between continuous mode of conduction and discontinuous 04 mode of conduction.
(c) Justify the name of converter as zero voltage switching converter with 07 necessary diagram and waveform.
OR
(c) Illustrate how the harmonic current are canceled by phase shifting transformer 07 in 12 pulse rectifier.
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Q.3 (a) Compare the three topologies of multilevel inverter. 03
(b) Compare HVAC and HVDC transmission-line. 04
(c) The buck-boost regulator has an input voltage = 12 V, duty cycle = 0.25, 07 switching frequency = 25 kHz, inductor = 150 pH, filter capacitor = 220 pF and average load current = 1.25 A. Determine (a) Average output voltage (b) Peak to peak output voltage ripple (c) Peak to peak ripple current (d) Peak current of switch (e) Critical value of L and C.
OR
Q.3 (a) Introduce the multi pulse converter. 03
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(b) Draw circuit diagram of 9 level asymmetric cascaded H bridge multilevel 04 inverter and mention the switching states to generate 0 level.
(c) The class E-resonance inverter operates at resonance and has Vs =12 V, R= 07 10 Q, fs =25 kHz and Q = 7. Determine optimum value of L, C, Ce and Le.
Q.4 (a) Draw block diagram of HVDC transmission system. Mention equipment 03 required for HVDC system.
(b) Justify: ZVS is better than ZCS. 04
(c) Explain in detail about rectifier and inverter control characteristic of HVDC 07 converter.
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OR
Q.4 (a) State the need of reactive power compensation. 03
(b) Draw and explain bipolar HVDC power transmission system based on 12 04 pulse converters for each pole.
(c) Discuss the operation of thyristor switched capacitor. 07
Q.5 (a) Compare SVC and STATCOM. 03
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Q.5 (a) Explain in brief about FACTS. 07
OR
Explain star/delta phase shifting transformer with phasor diagram. 03
(b) Write the advantages and limitations of SSSC. 04
(c) Explain how multilevel inverter is used as reactive power compensator with 07 necessary vector diagram.
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