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Q#1 Phase Controlled Converter GATE EE 2002 MCQ +2 marks -0.66 marks

A three phase thyristor bridge rectifier is used in a HVDC link. The firing angle α (as measured from the point of natural commutation) is constrained to lie between 5° and 30°. If the dc side current and ac side voltage magnitudes are constant, which of the following statements is true (neglect harmonics in the ac side currents and commutation overlap in your analysis)

Reactive power absorbed by the rectifier is maximum when α=5°

Reactive power absorbed by the rectifier is maximum when α=30°

Reactive power absorbed by the rectifier is maximum when α=15°

Reactive power absorbed by the rectifier is maximum when α=10°

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