A solar cell of 350 V is feeding power t o an ac supply

A solar cell of 350 V is feeding power t o an ac supply of 440 V, 50 Hz through a 3-phase fully controlled bridge converter. A large inductance is connected in the dc circuit to maintain the dc current at 20 A. If the solar cell resistance is 0.5 Ω, then each thyristor will be reverse biased for a period of

Voltage across 3-φ fully controlled bridge converter
V₀ = – (E – I_dc R_cell)
= – (350 – 20 × 0.5) = – 340V

i.e. , V₀ = -340 =	3V_me	cos α
	π

⇒	3 × 440 √2 cos α	= - 340
	π

⇒ α = 125°
Thus, each thyristor will be reversed biased for a period of (180° – 125°) = 55°