(Solved): In a single-phase thyristor converter, Vs=120V(rms) at 60Hz, and Ls=3mH. The delay angle ...

In a single-phase thyristor converter, $V_s=120\mathrm{V}(\mathrm{rms})$ at $60\mathrm{Hz}$, and $L_s=3\mathrm{mH}$. The delay angle $?=45^{?}$. This converter is supplying $1\mathrm{kW}$ of power. The dc-side current $i_d$ can be assumed purely dc. a) Calculate the commutation angle $u$. b) Assuming that the currents through the thyristors increase/decrease linearly during commutations, calculate the reactive power drawn by the converter.