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GWatPE

Senior Member

Joined: 01/09/2006
Location: Australia
Posts: 2127

Posted: 10:24pm 23 Nov 2010

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Hi AB,

as I posted above, the problem only appears when the logging computer was connected. This micro has a different earth to the system earth. The buck converter has a common positive.

The controller only starts to work at above around 100rpm, 2m/s windspeed. There is too little wind energy below this to really be concerned capturing part of it.

Gordon.

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domwild
Guru

Joined: 16/12/2005
Location: Australia
Posts: 873

Posted: 07:38am 10 Dec 2010

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Gordon,

Interesting read! Very happy to see you are now entering the MPPT arena, which you did not have to do for the F&P cap doubler situation. The discussion of MPPT needs someone like you with your black belt in electrickery.

Keep up the good work.

Taxation as a means of achieving prosperity is like a man standing inside a bucket trying to lift himself up.

Winston Churchill

GWatPE

Senior Member

Joined: 01/09/2006
Location: Australia
Posts: 2127

Posted: 01:04pm 10 Dec 2010

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Hi Dom,

Thanks for the rap, but Internet politics are affecting my replies to posts, however, I will reply to you.

I was able to get the Buck converter to work, but Murphy came along and broke it at the first decent wind. It ended up easier to work on the stator with the dremel and some dental burrs, and do a rewire.

The cap doubler has replaced the buck converter, and is producing the same relative power to the battery without any electrickery. The windmill is better behaved in high winds as well, which is a major plus. I have sacrificed some top end peak power for this more controlled behaviour and earlier cutin, but windmills are not just about quoting big numbers. It is about getting the windmill performance to match the wind conditions most of the time, and not just cranking big numbers in storms.

The cap doubler works equally as well with an AxFx mill, as it did with a F&P mill. Components are different, but results are the same.

My testing of a buck converter has concluded. I just cannot justify more effort. I don't doubt that making a much bigger unit would work, but I cannot see it being cost effective, compared to 12 diodes, and 12 capacitors.

Gordon.

become more energy aware

darcyrandall200

Newbie

Joined: 17/01/2009
Location: Australia
Posts: 34

Posted: 12:26pm 03 Jan 2011

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Hello,

Does anyone have a schematic for a wind turbine mppt they can share?

My F&P wind turbine is nearing completion. I wish to start thinking about how I can extract the most amount of power from it.

thankyou

Thankyou.

Regards Darcy Randall, Perth Western Australia

domwild
Guru

Joined: 16/12/2005
Location: Australia
Posts: 873

Posted: 01:11pm 03 Jul 2014

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Darcy,

Did you get a schematic from another forum? If so, pls let us have it! I find using a PIC-based solution like a Picaxe reduces the number of electronic components as the software takes over the control functions of the hardware.

Taxation as a means of achieving prosperity is like a man standing inside a bucket trying to lift himself up.

Winston Churchill

domwild
Guru

Joined: 16/12/2005
Location: Australia
Posts: 873

Posted: 02:16pm 20 Jul 2014

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Gordon and Jean from another MPPT thread:

Now here comes a tall order: There is much more available on MPPT via analogue means compared to MPPT via PICs. Would it be possible to see a schematic and/or code? I realize this is a fluid project and components/code changes all the time but it might just be possible to send comments/pseudocode alone (no code) to get the gist of things. And an "approximate" schematic.

Something more detailed than

Main
Read parameters, e.g., rpm, voltage into batt, amps, wind speed
Hill climbing algorithm for optimisation, like measure power into batts, increase pulse width, measure power in, increase/decrease pulse width
Goto Main

If only it were that simple!

Taxation as a means of achieving prosperity is like a man standing inside a bucket trying to lift himself up.

Winston Churchill

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