How to practice concept:sinusoidal-pulse-width-modulation

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Question 60

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A 3-phase grid-connected voltage source converter with DC link voltage of 1000 V is switched using sinusoidal Pulse Width Modulation (PWM) technique. If the grid phase current is 10 A and the 3-phase complex power supplied by the converter is given by

VA, then the modulation index used in sinusoidal PWM is __________. (round off to two decimal places)

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Question 39

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The figure below shows a half-bridge voltage source inverter supplying an RL-load with

and

. The desired fundamental frequency of the load voltage is 50 Hz. The switch control signals of the converter are generated using sinusoidal pulse width modulation with modulation index,

. At 50 Hz, the RL-load draws an active power of 1.44 kW. The value of DC source voltage

in volts is
Diagram for Electrical Engineering question 39

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