How to make sure that a home windmill generator generates current constantly at 50 Hz (at 230V) for household?

Image by Jeff Hill Photo
Black and White shot of the Spanish Fork Windmills in Utah, due to their location and size it’s a bit difficult to get a good angle on them.

Question by Rox Tarr: How to make sure that a home windmill generator generates current constantly at 50 Hz (at 230V) for household?
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How is this achieved at industrial scale ( e.g. Suzlon) ? I doubt if they use batteries; Please correct me if I am wrong.

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