EEET2337 - Electrical Energy Conversion - Engineering Assignment Help

Assignment Task

1. A single-phase half-wave thyristor rectifier is fed from a 155.56Vrms 50Hz AC source and feeds a 73.33V battery through a series 18? resistor and 66.7mH inductor combination. The firing angle α = 38.136?

(a) Draw the complete circuit diagram for this system. Ensure that you clearly label all circuit elements, including all sources, the switching devices and all passive elements.
You may draw the circuit by hand or include a Powersim PSIM or equivalent schematic in your submission.
(b) vs(ωt), Sketch waveforms over two complete AC cycles showing the source voltage the rectified voltage that develops across the series resistor, inductor and battery load combination vdc(ωt), the battery current i(ωt), the voltage across the thyristor vT (ωt), the voltage across the resistor vR(ωt) and the voltage across the inductor vL(ωt).
(c) Determine a time varying expression for the current flowing into the battery as a function of angular time (ωt). Show all calculations and steps.
(d) A free-wheeling diode is now connected in anti-parallel to the rectifier output. Draw the complete circuit diagram for this new system. Ensure that you clearly label all
circuit elements, including all sources, the switching devices and all passive elements. You may draw the circuit by hand or include a Powersim PSIM or equivalent schematic in your submission.

(e) For the circuit configuration of 1(d), sketch waveforms over two complete AC cycles showing the source voltage vs(ωt), the rectified voltage that develops across the series resistor, inductor and battery combination vdc(ωt), the battery current i(ωt), the voltage across the free-wheeling diode vFW D(ωt), the voltage across the resistor vR(ωt) and the voltage across the inductor vL(ωt).

(f) Determine a new time varying expression for the current flowing into the battery as a function of angular time (ωt). Show all calculations and steps.

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