Re: how i can built an voltage stabilizer for i/p 150vac to 175vac & o/p 220vac using
Please describe any efforts you have made up to now.
I suppose you have unstable grid power? The news reported the massive blackout in July of this year, across half of India.
Unfortunately it is not an easy problem to solve. A pic can only do things with low DC voltage. However you wish to work with high voltage AC, which destroys low voltage devices.
There is such a thing as a step-up auto-former. It operates very much like a transformer, although it has just one coil (which saves some expense).
If you were to obtain one that steps up 40 percent, that would bring the mains AC into a normal volt range. You would need one rated at the amount of watts you need to run the appliance.
The autoformer ought to have multiple terminals, which you can select to take power at plus or minus several percent.