I've been going over the same problem here with cable twist.
In most places there is a prevailing wind or the wind generaly changes in a fairly random pattern or narrow range of directions and I'd just use heavy multistranded cable as has been suggested here and eyeball the situation once in a while.
That's not the case in my area of the country. The Northern Plains of the US (Nebraska, the Dakotas and parts of Iowa and Minnesota) tend to experience a predominately clockwise wind shift. Right now I live in the middle of several commercial wind farms and am on winter layoff from one of them.
In the summer especialy that means the turbines turn to the right about 3 times a week. While that may mean I'd have to go out and untwist my cables once a month or so I also have to take into consideration of extreme cold on the cables (and me) and that my eventual goal is a unit that I can put up and forget for years at a time. On the upside we have class 4/5 wind resource ratings here.
The method the large turbines use is not very practical on a small turbine. They have active yaw control and depending on the turbine in question when they've turned 3 to 5 times in one direction from "neutral" the yaw motor(s) kick in and turn the opposite direction until a neutral position is reached again. Technicaly possible but more stuff to break, more weight.......
What I've come up with is a slip ring design using silver/carbon composite brushes and based on a shaft grounding system for stray currents in large wound rotor generators. I already have some 2" hard brass tubing for the slip rings and 6 of the composite brushes ($35 each) plan to convert the output of the generator to 120 or 240 VAC/60Hz uptower before sending it down through the slip rings at a much lower current than DC used directly for battery charging. Basicaly like the rotor brushes/rings on an automotive alternator but at higher voltage/current and with much better brushes.
If you live in an area with winds like mine and don't want to have to untwist your cables manualy once in a while you can wait until I get my test turbine up. Otherwise follow the advice of the people here with more experience in small wind than me.
Once I start construction on it I'll post pictures, diagrams, schematics and descriptions of what I'm doing. My strong points are Electronic design and power conversion but I definately need to learn from the experience of the people here in all areas of small wind generation.
Any improvements/refinements that come out of the initial designs will be posted here in hopes of contributing to the Art of extracting power from the wind.
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