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Forum Index : Windmills : Update on 15� (4.6 m) axial-flux

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kitestrings
Senior Member

Joined: 23/04/2014
Location: United States
Posts: 102

Posted: 04:02am 15 May 2017

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Hi,

I thought it might be best to start a new topic. DaveP68 recently asked:

Quote Could you please supply me some operating data from your 15' axial-flux with MPPT controllers? Interested to know things like cut in RPM, peak RPM, operating Volts/Amps range into and out of MPPT controllers etc.

I've posted most of the progress on this turbine on OP, so rather than restate things I'll put some links below. Briefly it is a dual-axial, 16-pole PM turbine on an 85' guyed tower. It feeds two MPPT MS Classic 250 charge controllers via two isolated, full-wave diode stud-mounted bridge rectifiers. It cuts in at about 90 rpm and 59VDC and tops out at about 230 rpm and 140V. Each controller is set up to handle about 2.6 kW. Kind regards, ~ks

http://www.fieldlines.com/index.php/topic,149124.0.html http://www.fieldlines.com/index.php/topic,149071.0.html http://www.fieldlines.com/index.php/topic,148058.msg1026285.html#msg1026285
http://www.fieldlines.com/index.php/topic,147846.msg1023897.html#msg1023897

Edited by kitestrings 2017-05-16

DaveP68

Senior Member

Joined: 25/11/2014
Location: New Zealand
Posts: 292

Posted: 12:29pm 15 May 2017

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Hi kitestrings

This sort of data is of interest to me as it related to actual wind turbine performance using MPPT etc. So many thanks for making it available and have to say one very impressive set up!

For the PMA part as you have picked up, I'm only interested in the F&P 36 pole copper stators with back cap, as I can get them in reasonable numbers for free. Just add more to the shaft if you require more power(within limits of course).

Cheers

David

There are realities if you do not accept, will lead to frustration because you will be spending time on wrong assumptions and the results cannot follow! The Dunning Kruger Effect :)

kitestrings
Senior Member

Joined: 23/04/2014
Location: United States
Posts: 102

Posted: 03:53am 16 May 2017

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The Classics are a quasi MPPT approach. They don't monitor wind speed in real time, or periodically the way you might sweep a PV array, and then find the sweet spot. Wind changes are of course comparatively much too fast. Instead they have a 16-step, user-programmable power curve. The controller then looks at Vin (from the rectifier) to the controller and attempts to follow the power curve. I've fiddled with the settings quite a bit. This is what ours currently looks like:

MEM_6 MEM_6
03/11/17 03/11/17
Classic A Classic B
step amps volts amps volts
1 0 58 0 85
2 1 62 4 102
3 3 66 8 105
4 6 69 12 108
5 9 72 15 111
6 12 75 18 114
7 15 78 21 117
8 18 81 24 120
9 21 84 27 123
10 24 87 30 126
11 27 90 33 129
12 30 93 36 132
13 33 96 39 135
14 36 99 43 139
15 39 102 47 143
16 40 103 52 150

The first unit (Classic A) current limits at 40A. The second one wakes up at 85V and fully takes any incremental power, over the 40A mark, above 102V.

I hope this helps. ~ks

flc1
Senior Member

Joined: 20/11/2011
Location: New Zealand
Posts: 242

Posted: 10:59pm 25 Jun 2017

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just checked out your pics here Kitestrings, thats awsom setup, love the veiw from the top of your tower.

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