Hi Nando,
I am sorry you don't have a color monitor.
Thanks for the response. Here is my reply:
Nando:
To really get MPPT going either with the wind mill or the computer, one needs to properly set the system parameters, which I could not see well in your dissertation.
Smoggy:
I have no idea what you are talking about here.
What are the "system parameters"
I why do I have to set them.
Nando:
Take the standard formula for the wind mill versus wind velocity and generate the wind power curves.
Smoggy:
Again I don't know what you are talking about.
What is the standard formula you mention?
Nando:
Setup the generator to produce, let's say @ peak RPM a high voltage at least 5 times the battery voltage.
Smoggy:
There is no battery in the system I am talking about.
It is strictly resistive heating.
No need for DC - Conversion just adds loses.
Nando:
Define the internal resistance of the wind mill windings and calculate a % loss in the generator that is around 10 % the output energy.
Plot both curves or at least the output power curve with a load resistance that varies following the output power curve.
Smoggy:
Thats pretty much what the graphs shows.
Nando:
Then replace the variable load with a battery bank, the same you had for the 5 times the output voltage of the wind mill.
Smoggy:
No batteries here.
Nando:
Using the generator parameters with a battery load, generate the output power curve.
Compare both curves for efficiency power transfer - that is the MPPT gain.
Smoggy:
Pretty much what I did except for resistive load instead of battery.
Nando:
Good for you that you can handle high level math. -- congratulations.
Smoggy:
Thanks.
Nando:
TSR does not enter in the calculations -- TSR is just an adaptation to be able to match the wind to the generator.
Smoggy:
Matching the wind to the generator/load is what it is all about. TSR matters
greatly here.
Nando:
Name each graph to be able to follow it, sometimes one insert several graphs and they appear in different order as one expected.
Make the traces with different styles for easy viewing, if possible.
Smoggy:
I did the best I could with the graphs, I wish I could get them to show up better.
Nando:
I could tell the load variation, but I prefer that you find it when the proper parameters are implemented.
Smoggy:
I guess I just don't know what you mean here.
Nando:
You will discover that MPPT is WORTH the effort, as a fellow in UK found out when he placed his wind mill to harvest MPPT energy for heating, I have been assisting him for several months now, with about 900+ KW-hr/month of harvested energy to keep is farm house warm.
Smoggy:
Do you have any data to show how much extra power he is getting
because of the MPPT.
Maybe some nice graphs properly placed and explained
Anything at all to convince me.
When increasing the load to the generator the generator always becomes less
efficient and if the blades are operating above design TSR they will become
more efficient. What I am tring to show is that the added efficiency of bringing
the blade rpm into a more efficient TSR is almost completely lost to the added inefficiency of the generator. I know that there are people who will disagree but I would like them to show me some data or reasoning that would support it. Just to say that you have
added MPPT to a system and an improvement was made is not that convincing as I
have no idea what the before and after pictures actually were.