Best Choice Of Transformer Connection For VSD

Delta primary and wye (or star) secondary is what I'm used to seeing. I believe the reason for the wye secondary is to provide a safety ground via the transformer neutral. There may be other reasons.

I'm not familiar with a VSD load. Can you provide more detail?

By VSD I'll assume you mean Variable Speed Drive, which could be AC or DC. In either case, joeconed is right, Delta - Wye (star) is the best choice, if for no reason that to keep the voltage potential across the input phases of the rectifier as low as possible. That means the PIV rating can be lower. Many AC drives (VFDs) will specify that they be fed from a grounded Wye system unless modifications are made.

In all VFD Or VSD 3 Ph Y is used with a neutral.
Power-Rectifier is a 3ph Full-Bridge & N is only used for Control & Indications Circuitry

No Transformer is used in-side the VFD but Local-Electrical Company supplies 3 ph supply at the
General-Public or Industrial requirements.