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#1
12-18-2010, 01:20 PM
 hello14 New Member Join Date: Dec 2010 Posts: 4
measuring wind turbine power

I have a 3 phase AC wind turbine that is directly connected to 3 pieces of same ligthbulbs. here is the picture (http://img232.imageshack.us/f/photol.png/). I'm wondering how should I compute for the power generated by the turbine.
#2
12-18-2010, 04:48 PM
 beenthere Senior Member Join Date: Apr 2004 Location: Missouri, USA (GMT -6) Posts: 15,815 Blog Entries: 10

Obtaining a measure of both voltage and current across a load will give you power. Power is the product of those measurements.
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#3
12-18-2010, 05:31 PM
 hello14 New Member Join Date: Dec 2010 Posts: 4

do I need power factor or √3 (squareroot) ?
#4
12-18-2010, 06:17 PM
 thatoneguy Senior Member Join Date: Feb 2009 Location: Midwest USA Posts: 6,356 Blog Entries: 4

If you have a True RMS meter, you will get the real voltage and real current through each bulb. Multiply them for real power.

A non True RMS meter will give a close voltage if the input is an undistorted sine wave (which yours is), you can do the same math.

You only need to worry about 1.404 and 0.707 when converting between peak and RMS or vice versa.
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Also-Impedance Graph paper.
#5
12-18-2010, 06:17 PM
 beenthere Senior Member Join Date: Apr 2004 Location: Missouri, USA (GMT -6) Posts: 15,815 Blog Entries: 10

You can always go through a full wave rectifier and deal with DC.
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First comes the hardware, then the software.
#6
12-18-2010, 06:33 PM
 thatoneguy Senior Member Join Date: Feb 2009 Location: Midwest USA Posts: 6,356 Blog Entries: 4

Quote:
 Originally Posted by beenthere You can always go through a full wave rectifier and deal with DC.
This would work if it was filtered. Would need to be cautious on what voltage caps to get. Make sure you get caps rated for over the Peak Value.

I'm guessing this test is to get an idea of the voltage and power the windmill outputs, a home made one, is this correct?
__________________
$\small{\fra{1}{\fra{1}{R_1}+\fra{1}{R_2}+{\dots}+{ \fra{1}{R_N}}}$ Nifty? -Click Here to see how to make your formulas Look GOOD!
Also-Impedance Graph paper.
#7
12-18-2010, 10:36 PM
 timrobbins Senior Member Join Date: Aug 2009 Location: Melbourne, Australia Posts: 318

hello hello,

As per above, you need to calculate the power through each bulb by V x I. You then need to sum the three measured power levels.

If the bulbs are the same type then you could make an assumption for turbine power as 3x the power measurement for one bulb.

Bulbs are non-linear loads so you can't use the bulb power rating. Bulbs will fail very quickly if you apply more voltage across the bulb than the rated bulb voltage (very easy situation to occur with a wind turbine, and can lead to ugly consequences as the turbine is then unloaded).

Ciao, Tim

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