Elecronics is not generally done at high voltages so you will need to drop the input voltage and then amplify the output to suit.
The 4018 chip can give a three phase square wave output when clocked by six times the output frequency.
See CMOS Cookbook by Don Lancaster p334.. .
You could investigate three phase shift stages, each of 120 degrees, connected in a loop. Just the job for a simulation project.