Hi, why aren't these circuits working?

The three phase inverter only converts one period.

Answer 1

[Sabin]

Thyristors are unidirectional devices—they conduct only when forward-biased and triggered by a gate pulse. After conduction, they turn off only when the current through them drops to zero.

[Dimitar]

Can you show me how one of the legs would look like for it to work properly please?

thanks!