$1)$ With the help of the waveform given below, answer the following questions

a$.$ develop the equivalent circuit of the power conversion scheme represented

b$.$ Develop the switching diagram for the individual switches used in the circuit

c$.$ Write down the equations of the $3$ phase line to line voltages with the help of the illustration and developed circuit $(10$ marks each$=10*3=30$ marks$)$

answer everything properly, thank you.