How to control the fluctuation of energy in wind turbine?

Due to the change in the wind speed, the speed of the wind turbine rotor changes, so at the output we get variable AC supply which means we do not get exactly constant voltage and frequency.



It can be control by controlling shaft speed and at the output by varying the load (Resistance).



I need to submit a case study about that so tell me about any site or e-book where I can find comprehensive details about that.How to control the fluctuation of energy in wind turbine?
Variable-pitch propellers would help with shaft speed:How to control the fluctuation of energy in wind turbine?
RenewableEnergyWorld.com had some articles on this awhile ago.

how i can go to the us to work

latin name for