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2003 Course Advanced Power Electronics

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Total No. of Questions : 12] P1346 [Total No. of Pages : 3 [3764]-226 B.E. (E & TC) ADVANCED POWER ELECTRONICS (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to candidates : 1) Answer Q.1 or Q.2, Q.3 or Q.4, Q.5 & Q.6 questions from Section I and Q.7 or Q.8, Q.9 or Q.10, Q11 or Q12 questions from Section II. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 6) Assume suitable data, if necessary. SECTION - I Q1) a) b) Q2) a) b) Draw the circuit diagram of three - phase fully controlled converter feeding a resistive load and the following: Waveforms for = 30 . [10] i) Supply phase voltages. ii) Supply line voltages. iii) Output voltage. iv) Supply Current (any one phase). v) Current through SCR (any one). Explain the effect of source inductance on the performance of a single phase full converter with waveforms. Derive expression for its output voltage interms of maximum voltage (vm), filing angle , and overlap angle . [8] OR Explain with a neat circuit diagram and relevant waveforms, the operation of a three-phase circulating current type dual converter. Derive an expression for the peak circulating current in terms of the filing angle.[10] With the help of a neat circuit diagram, explain the technique for achieving equal voltage sharing of two series connected diodes. Derive the relationship between the current sharing resistors in terms of the diode parameters. [8] P.T.O.

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