Re: Parallel Conductors - 1/0 minimum?
This being a branch circuit for a motor the conductors do not need to be sized to the breaker.
You may size the conductors to the full load current of the motor you will be running from this VFD.
Take a look at Table 240.4(G) Specific Conductor Applications and parts II, III, and IV of article 430.
If you post the motor size you are going to be running (you did not say if you where using the drive to the maximum rated load) we could help you out.
Most systems work best if they are kept simple rather than made complicated; therefore simplicity should be a key goal in design and unnecessary complexity should be avoided.