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Topic: About SOLAR CHARGE CONTROLLER (Read 305 times) previous topic - next topic

engadhamosama1990

Dear all,

I am new in this field so I would like to know where I can get a solar charge controller that can receive an external control signal from an Arduino kit (PWM signal ) ? any suggestions and links please

mauried

Really need more information.
What is the purpose of the control signal, ie what do you want to happen.
What is the charging source and what are you trying to charge?

nielyay

sory i never do the project about solar charge before.

But maybe this page can help, have you check it?
access > here

ReverseEMF

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engadhamosama1990

I am new in this forum so I am sorry for any inconvenience, 

I am doing a master degree and it discusses 4 mppt techniques. i am using matlab software and i made a model of a PV system feeding a pump station. I intend to do a project applying mppt  concept practically.

i will use an arduino kit working as a mppt controller. the arduino kit has 2 signals from PV sourse current and voltage. and it is connected to matlab software that has the 4 mppt methods. when applying mppt method the arduino will send an optimum pwm signal to the switches of the dc/dc  converter so that an optimum power is received from PV to the dc pump.

The main problem I am facing is that dc dc converter circuits don't receive an external pwm signal as it has its oscillator producing a certain frequency to the switches.

ReverseEMF

I am new in this forum so I am sorry for any inconvenience,  

I am doing a master degree and it discusses 4 mppt techniques. i am using matlab software and i made a model of a PV system feeding a pump station. I intend to do a project applying mppt  concept practically.

i will use an arduino kit working as a mppt controller. the arduino kit has 2 signals from PV sourse current and voltage. and it is connected to matlab software that has the 4 mppt methods. when applying mppt method the arduino will send an optimum pwm signal to the switches of the dc/dc  converter so that an optimum power is received from PV to the dc pump.

The main problem I am facing is that dc dc converter circuits don't receive an external pwm signal as it has its oscillator producing a certain frequency to the switches.
So, am I missing something?  You say you want to control an MPPT controller from an Arduino--optimize it's functionality?  But, isn't the MPPT controller already achieving optimum control [it's defined function]?  Why not just implement the MPPT directly?  That is the topic of your Master's thesis, right--shouldn't you know how to do that?

But, then, you used the term DC/DC Converter -- how is a DC to DC converter an MPPT?  Or is it that you're trying to use an off-the-shelf DC to DC Converter as an MPPT, by tuning it's frequency [or feeding it your own PWM signal--you seemed to state both these things], in order to get peak performance out of it, at the optimal power point, thus turning it into an MPPT?  

But, then, I'm not familiar with matlab, so maybe that's my stumbling block.
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Please DON'T Private Message to me, what should be part of the Public Conversation -- especially if it's to correct a mistake, or contradict a statement!  Let it ALL hang out!!

engadhamosama1990

yes it is my master thesis but it is normal to face new things and problems and try to ask and solve them ! as well i did not say that i will controll a mppt controller just i will apply these techniques from matlab to the switches of the converter

mauried

Have a look at this.
http://www.timnolan.com/uploads/Arduino%20Solar/ArduinoSolar.pdf

This is an original schematic for a MPPT charger based on Arduino and using a 1/2 bridge charger.
You will have to describe exactly what you are trying to do though, including what voltage and power Solar panels are being used, and what you are trying to charge.
The circuit as shown is for a 12V Panel , Max power 100 watts max, and a 12V lead acid battery.
Ive built a couple of these, and they work pretty well.
The MPPT algorithm is a simple hill climber which is easy to implement and it works pretty well most of the time.
There are a few conditions which can temporarily confuse it , namely fast fading caused by cloud shadow moving across the panels.
There are better algorithms , but most are harder to code and even harder to debug.


ReverseEMF

#8
Sep 21, 2018, 07:37 pm Last Edit: Sep 21, 2018, 07:41 pm by ReverseEMF
Not sure if this is of any use, but saw this and thought of you:

https://www.allelectronics.com/item/scn-6/solar-panel-controller-dc-dc-step-down/1.html

All Electronics is an electronics surplus store, so the stuff they sell is often as-is with little or no documentation.  This appears to be in that category, BUT I thought maybe, since it's all exposed as such, you might be able to hack the thing, to get it to do what you need.
"It's a big galaxy, Mr. Scott"

Please DON'T Private Message to me, what should be part of the Public Conversation -- especially if it's to correct a mistake, or contradict a statement!  Let it ALL hang out!!

srnet

Is this a real working project, or are you just trying to get a simulation running in MATLAB ?
$50SAT is now Silent (but probably still running)
http://www.50dollarsat.info/
http://www.loratracker.uk/

nielyay

Quote
mppt controller just i will apply these techniques from matlab to the switches of the converter
have you been check this page about mppt algorithm using matlab?

access >> here

hopefully can help.

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