Question
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 (– 4000 – j3000) VA, then the modulation index used in sinusoidal PWM is ______. (round off to two decimal places).
Answer :
0.471 (Range : 0.46 to 0.48)
Given :
(i) 3-phase grid connected voltage source converter with DC link
Vdc= 1000V using sinusoidal pulse with modulation (PWM)
(ii) Grid phase current IL=10A
(iii) S = (– 4000 – j3000) VA
The modulation index. The expression of fundamental phase voltage of 3-phase sinusoidal PWM
(vph)01=m Vdc/2 sin(ωt)
√3vL01(rms)
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