Question

A single phase full bridge inverter has RLC load with R = 4 Ω, Xl = 11 Ω and Xc = 20.54 Ω. The dc input voltage is 230 V. Find the value of fundamental load power.

(a) 1633 W

(b) 1603 W

(c) 1576 W

(d) none of the mentioned

This question was addressed to me in quiz.

The above asked question is from Single Phase VSI-5 in chapter Inverters of Power Electronics

Answer 1

The correct option is (b) 1603 W

The best explanation: Average value of fundamental output voltage =  4Vs/π = 292.85 V

Z = [R^2 + (Xl – Xc)^2]^1/2

I = V/Z = 28.31

I(rms)(fundamental) = V/Z√2 = (292.85)/(1.414 x 10.345) = 20.02 A

Fundamental Load power = (20.02)^2 x R = (20.02)^2 x 4 = 1603.2 Watts.