So exactly what is an "alternative voltage regulator"? A voltage regulator that produces AC?

I think you really have to provide yourself with some more information, and then share it here before anyone will have even the faintest idea what you are talking about.

By the way - is your school explicitly sending you out on the net to find people to supply you with circuit diagrams for your project? What will you learn from that? As of now, you don't even seem to have learned exactly what your project is about...