Author Topic: How can I match my Generator to the Prop and Loads?  (Read 8495 times)

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wooferhound

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How can I match my Generator to the Prop and Loads?
« on: June 15, 2010, 12:42:29 PM »
One of the most difficult things to accomplish when making a Wind Generator is to match the Prop to the Generator and then again to the loads that you plan to use. One our most knowledgeable users, Flux, has written some excellent articles on Load Matching and here they are . . .

http://www.fieldlines.com/board/index.php/topic,127288.html
http://www.fieldlines.com/board/index.php/topic,128552.html
« Last Edit: July 28, 2010, 08:03:59 PM by wooferhound »

SparWeb

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Re: How can I match my Generator to the Prop and Loads?
« Reply #1 on: August 11, 2010, 02:28:29 PM »
I have been working on a way to illustrate the power a prop can collect, and the power a generator demands.

http://www3.telus.net/faheydumas/Wind_Turbine/1_Blades/Aero.html

Using a chart like this to show the power of the prop at different wind speeds:



Every rotor blade can have a curve like this.  To the left is "stall" and to the right is overspeed.  Bear in mind that stall doesn't bring the power to zero, it just seriously reduces it and things go downhill quickly thereafter.  There is an obvious "best speed" where the prop gets the most power from the wind at any given wind speed.

Then I super-impose the power curve of a generator, or several of them to compare:



On this chart, you can see three generators' power curves.  One runs too slow (low RPM) and the prop will probably stall.  The curve on the right is too fast, and that generator will let the blades run fast, maybe even running into furling problems. 

...And the middle one is "just right".   ;)

If you want to know how to create curves like this...  well... the first thing I have to ask is, "how's your calculus?"  :(
No one believes the theory except the one who developed it.  Everyone believes the experiment except the one who ran it.

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