Actually we have a grid consisting of N generators supplying a given amount of power to a load,and we want to keep the frequency, power and voltage constant in the event of a change in wind velocity.
You may read
Jianzhong Zhang; Ming Cheng; Zhe Chen; Xiaofan Fu, "Pitch angle control for variable speed wind turbines," Electric Utility Deregulation and Restructuring and Power Technologies, 2008. DRPT 2008. Third International Conference on , vol., no., pp.2691,2696, 6-9 April 2008
Power is rarely regulated in a changing wind environment. When the wind slows the power reduces etc. Frequency regulation is usually done by means of power electronics in the form of grid tied invertors (Type 4 full conversion).
Truely synchrous generation (traditional synchronous generator) can be used in wind turbines with the use of CVT's. These are gearboxes that dynamically change their gearing ratio in an analogue fashion. Conical gears, Reeves Drives and hydrostatic gearboxes are all formes of CVT's. The use of these gearboxes is effectively type 5 wind turbine technology however to the best of my knowledge there are currently no commercial turbines using this technology yet.
The frequency may be kept constant by using a suitable power electronic device, provided you have power generated. Concerning the power, the issue is much more complicated if not impossible. Note that, it there is no wind at all, the power will be zero... In fact, power depends on the cube of the wind speed.... so, fluctuations on wind (always happen) implies variable generated power by the wind generator.
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