controlling the coefficient of power in a wind turbine

[kf]

for small wind turbines (domestic uses), do they only influence the Cp with controlling the tip speed ratio. And do nothing to the pitch? was just wondering. I assume at small levels that it becomes too expensive to put in a controller to and movable blades to allow that.

 

AND, if anyone knows of any internet resources where the techniques are discussed how the TSR is controlled let me know of them? I've seen things that are too basic or too complicated. nothing in between.