First,
Study all of this site in its entirety.
Second
It is unlikely you will grid tie a home built PM alternator to the grid
without batteries feeding a grid tie inverter.
Third
A grid tie inverter is usually big bucks.
Fourth
Your power company will have to be involved and will have the requirements for you to tie to their network.
Fifth
This will not save you any money over current electric rates but will cost a bundle.
Thurmond