Renewable Energy Questions/Discussion > Automation, Controls, Inverters, MPPT, etc

MPPT

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artv:
Maximum Power Point Tracking..
I'm not even sure if thats right?
Could it be used to close a contact, when the coil is at max out-put?
I want the circut to engage just before peak output, then disengage , right after peak output..
I've been trying to do this by mechanical means .......
Just wondering if this is what MPPT does??
and so it goes on..........artv

Bryan1:
G'day Artv,
                  Basically a MPPT uses a buck step down converter and the P channel fet is pulsed to get the maximum performance. I am working on a MPPT project and the pic below shows the barebones of the buck circuit.

Cheers Bryan

Wolvenar:
LOL no offence Bryan, but I can see a laymen say..
What the heck did he just say ?

artv:
Thanks for the reply Bryan1,
But like Wolvenar just said "what the heck"..
I don't know much of anything with electronics...
But your diagram basically splits the output of each phase , and feeds it to both sides of each bridge . I've never seen this before.
I will give it a try....
I found that by putting a diode parralel to the phase connection ,then connecting back to the dc out of the bridge ,gives about a 10 percent increase.
Kind of hard to explain.
When I can get my mechanical switch working right,(not very consistant),  it triples the output and only testing one phase.
here's a pic of my latest failure
It didn't work.....artv

rossw:
Art, Bryans example was a fairly specific case of MPPT.

MPPT is really a "concept", that may be implemented in a variety of ways. It stands for "Maximum Power Point Tracking", and it means exactly what it reads like.

It's a control system that adjusts itself to get the Maximum Power from a source, and it then Tracks as changes happen, to ensure it remains on the maximum power point.

Initially, this was most common on PV arrays, where the voltage changes with current drawn, but isn't linear. There's one point on the curve where you get maximum WATTS out. It's not the maximum current, and it's not the maximum volts, and it varies depending on temperature and illumination and other factors.

It's also finding favor now with wind turbines. Turbines are trickier though, as they change far more quickly than PV, and if you lose control with a PV, nothing happens much, whereas a turbine can easily fly apart.

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