Six pulse rectifier: PE Power Power Electronics practice question

A 480 V, 60 Hz plant bus feeds a dc motor drive through a three-phase full-bridge (six-pulse) thyristor rectifier. The dc link has a large smoothing inductor, and the drive is drawing 150 A dc. The thyristors are fired at a delay angle of α=30∘\alpha = 30^\circ. Neglecting source inductance, the average dc output voltage of the rectifier is most nearly:

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