Can someone please tell me why this three-phase inverter is not giving the correct output and maybe give me some tips on how to fix it?

 

So what is the nature of the incorrect output are you getting?

 

What do you expect to see at what test points?

Signals from an actual 3-phase 400Hz inverter board.

Filtered sine-wave , SV-PWM output and timing pulse signals.
https://www.switchcraft.org/learning/2017/3/15/space-vector-pwm-intro

 

I am getting a positive three phase sinusoid ranging fro 40V-325V. I expect to see an alternating three phase sinusoid from -325V-325V. There is an issue with the simulation so it only shows the first few microseconds so it won't even help being posted here.

 

I am getting a positive three phase sinusoid ranging fro 40V-325V. I expect to see an alternating three phase sinusoid from -325V-325V. There is an issue with the simulation so it only shows the first few microseconds so it won't even help being posted here.

Hopefully another can help you with that simulation problem.