Question

A three-phase full converter charges a battery from a three-phase supply of 230 V. The battery emf is 200 V. Find the value of the firing angle if the battery terminal voltage is 210 V.

(a) 36.54°

(b) 56.7°

(c) 89.3°

(d) 47.45°

I got this question during an interview.

The query is from Three Phase Converters-2 topic in division Converters of Power Electronics

Answer 1

Right answer is (d) 47.45°

The explanation: Vo = (3Vml/π) cos α

α = cos^-1(210π/3√2×230) = 47.453°.