22-Elec-B8 Power Electronics and Drives, December 2018: worked solutions

Paper format. National Exams, December 2018 — 16-Elec-B8 Power Electronics and Drives. Three hours, open book, any non-communicating calculator. Six problems of equal value; any five constitute a complete paper. All six are solved here, because the set is a study resource rather than a three-hour sitting.

Reference texts.

M. H. Rashid, Power Electronics: Circuits, Devices and Applications, 4th ed. — primary text for this subject (Ch. 10 controlled rectifiers, Ch. 11 a.c. voltage controllers, Ch. 5 d.c.–d.c. converters, Ch. 6 inverters, Ch. 15 d.c. and a.c. drives).
N. Mohan, T. M. Undeland and W. P. Robbins, Power Electronics: Converters, Applications and Design, 3rd ed.
B. K. Bose, Modern Power Electronics and AC Drives — constant-volts-per-hertz and PWM drive material.
R. Krishnan, Electric Motor Drives: Modelling, Analysis and Control — d.c. drive loop design.
C. W. Lander, Power Electronics, 3rd ed. — classical phase-control derivations.

Check: how the printed part-lettering is handled. PROBLEM 4 and PROBLEM 6 each open with an unlettered descriptive item and then resume lettering at a-; PROBLEM 4 additionally skips b-, running a-, c-, d-. The solution keeps the exam's own lettering verbatim and answers the unlettered lead item first, so that every printed item is covered and the marks add to 20 per problem.

22-Elec-B8 Power Electronics and Drives: December 2018