I need someone to help me design SPWM inverter with ltspice. My supervisor doesn’t like what I already design and I can’t figure it out yet. Below is the design i have.

 

Homework?
What have you designed so far? All I see is the H-bridge. Why doesn't your supervisor like it?

 

HI,
Registered with AAC as an 'Electrical Engineer'

Mod

 

I would say that you have some research to do. I can suggest some starting points, but I can't do the work for you.
Hart, Daniel W., Power Electronics, 2011
Power Electroics - PWM Inverters - Part 1 (youtube.com)

 

Registered with AAC as an 'Electrical Engineer'

Perhaps to get around the Homework Help limitations.

 

Have you written a requirements specification detailing the aim of the project ??
Simulating a bridge is easy. The drivers of the have to be isolated and this will be a challenge.

 

Please define "pure" in terms of distortion.