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#Post#: 3910--------------------------------------------------
Re: Arduino Controllers
By: lynx wind Date: July 18, 2014, 8:36 pm
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Very cool. Using an unloaded sensor to read power in the wind
may just be the way to load a turbine correctly through its
power curve. I am so glad you know how to do this stuff.
#Post#: 3911--------------------------------------------------
Re: Arduino Controllers
By: nessprojects Date: July 18, 2014, 8:52 pm
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Trust me...it is so simple with these things, the only thing you
are doing is building interfaces and sorting the code.
It will be very interesting to see the results and adjust as
necessary.....This is my territory...still learning but loving
it in the process.
#Post#: 3936--------------------------------------------------
Re: Arduino Controllers
By: nessprojects Date: July 21, 2014, 2:51 pm
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Managed to get the RPM side of things linked up today so now the
TSR can be calculated live.
Sorted the software out but was getting weird results for the
TSR.....Unfortunately I made a school boy error.....The formula
requires meters per second and I was feeding it with miles per
hour. ::) Code changed now and running great.
It reads the average of RPM and WIND SPEED over a 5 second
period then does the calculations for the TSR.
#Post#: 3937--------------------------------------------------
Re: Arduino Controllers
By: lynx wind Date: July 21, 2014, 2:56 pm
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Awesome. With that data you can then calculate power in the
wind, and how much to load the turbine. This is going to be
fun. I don't know of anyone else taking this approach. Others
use calculated look up tables based on voltage, but that changes
as loading varies.
#Post#: 3939--------------------------------------------------
Re: Arduino Controllers
By: lynx wind Date: July 21, 2014, 5:33 pm
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@CG,
The problem with frequency of AC, is when you load the turbine
it drops frequency and rpm. You don't want the controlling
variable affected by the control.
#Post#: 3940--------------------------------------------------
Re: Arduino Controllers
By: nessprojects Date: July 21, 2014, 6:09 pm
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I think there could be some confusion here.....The RPM on this
system is detected from the turbine AC side but the anemometer
is just detecting the wind speed. The Arduino is doing the rest.
I need to get myself a new video camera instead of this Key Fob
camera but I am trying my best with the videos.
Here is just a short video of the lcd display readings in about
a 5 mph wind using the Diy75-rebuild and loaded with 2200uf caps
on the booster....Top left=Wind Speed....Top middle=Turbine rpm
and top right=TSR calculated......Update=5 seconds.....Sorry for
the quality.
HTML http://youtu.be/lGDBCbFfACQ
#Post#: 3943--------------------------------------------------
Re: Arduino Controllers
By: lynx wind Date: July 21, 2014, 8:03 pm
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It's a good discussion. I don't think there is confusion. Both
methods of determining power work. It's just that when the
determination of windspeed is independent of the turbine we can
know through calculation how much power is impinging on the
turbine. Then by knowing the efficiency of the turbine at that
windspeed we can know what voltage and amperage to load. As the
turbine is loaded it slows down but the independent windspeed
meter doesn't.
It is more complicated but it will work to make the controller
far more simple. For the cost of a simple anemometer and some
wire I think it is worth the complication.
#Post#: 3944--------------------------------------------------
Re: Arduino Controllers
By: nessprojects Date: July 21, 2014, 8:38 pm
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So ..... What we need to do is run the turbine unloaded to
determine its maximum TSR, then the loading can be determined
from that ?.
Maths is not my strong point (as such) but I will do anything
within my capabilities to solve a problem.
My initial thoughts were to load the turbine at a particular TSR
using PWM from the controller in the configuration I have, but
if you have a better or easier way please explain.
How do we get the efficiency of the turbine ? or is this just a
guess until we are at a correct situation ?
Understanding is the hard part for me.....many apologies guys.
When I was a kid I always had to take thing apart to see how
they work.....then I knew how and why it worked !.
#Post#: 3945--------------------------------------------------
Re: Arduino Controllers
By: lynx wind Date: July 21, 2014, 9:15 pm
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The power in the wind formula tells us for a given swept area
how many watts there are
If we know the windspeed we know the watts
If we know the efficiency of the turbine at each windspeed we
know how many watts we can take without stalling (known for the
Gull design 40% low wind - 15% high wind)
If we know the TSR the turbine likes we know the rpm and voltage
(known for the Gull as between 1.2-2.0 tsr)
So at 10 mph there may be just 10 watts or 13 volts x .76 amps
At 20 mph there may be 72 watts or 13 volts x 5.5 amps
But its more efficient to allow the turbine to run up faster to
30 volts x 2.4 amps and buck the voltage down to load voltage.
This is where we square wave the higher voltage.
All this information can be loaded into the program and tested.
#Post#: 4023--------------------------------------------------
Re: Arduino Controllers
By: nessprojects Date: July 30, 2014, 5:55 pm
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Update:-
Finally received my new arduinos and my new Lcd display today,
so now I have got my programming head on trying to build a buck
system for my re-build turbine.
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