1) Wind turbine 
=== The case against variable speed wind turbines === As already mentioned, variable speed wind turbines cannot be directly connected to a transmission system. One of the drawbacks of this is that the inertia of the transmission system is reduced as more variable speed wind turbines are put online. This can result in more significant drops in the ...
The ratio of the blade tip speed to wind speed
Four rotors designed to run at different tip speed ratios. Image courtesy Hugh Scoraig In reference to a wind energy conversion device's blades, the ratio between the rotational speed of the tip of the blade and the actual velocity of the wind. High efficiency 3-blade-turbines have tip speed r...
In reference to a wind energy conversion device's blades, the difference between the rotational speed of the tip of the blade and the actual velocity of the wind.
The speed at the tip of the rotor blade as it moves through the air divided by the wind velocity. This is typically a design requirement for the turbine.
The ratio of how much faster than the windspeed that the blade tips are moving. Abbreviation TSR.
In reference to a wind energy conversion device's blades, the difference between the rotational speed of the tip of the blade and the actual velocity of the wind.