GATE EE 2019 Set 1 — Question 64
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Power Electronics → AC-DC Converters → Controlled Rectifiers (3φ)
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Question
A fully-controlled three-phase bridge converter is working from a , AC supply. It is supplying constant current of at to a DC load. Assume large inductive smoothing and neglect overlap. The rms value of the AC line current in amperes (round off to two decimal places) is _________.
Correct answer
81 to 82
Solution
For a three-phase fully controlled bridge converter with constant DC current , the line current waveform is a quasi-square wave. In each cycle of radians, the line current is for ( radians) and for ( radians). The RMS value of the line current is calculated as:Given:
Substituting the value:Rounding off to two decimal places, the rms value of the AC line current is . This value falls within the official range of to .
Substituting the value:Rounding off to two decimal places, the rms value of the AC line current is . This value falls within the official range of to .
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