If you want power on demand and the wind doesn't blow
on demand, then you need storage and an inverter. That
storage could be battery, small scale pumped hydro, etc.
but I think batteries are your best bet, and the bank ought
to be designed based on what inverters you can find that
you like.
On the plus side this eliminates a need for a speed regulated
alternator / blade head. Though many AC motors will operate
as generators when line connected and overdriven, I'd assume
you do not expect an available continuous power feed and
forget about that.