Toufik,

These are standard experimental procedures, and should be available in many books.

-Sanjay

Sanjay is quite correct - of course! Basically the slope of the IV curve at V ~ 0 is a measure of the shunt resistance and at I ~ 0 a measure of the series resistance. Incidentally, the point where I/V = - dI/dV is the maximum power point. Maybe some MPPT's work on this principle, though I haven't come across one.

That's right, Tony.

What the "PV community" refers to as MPPT by incremental admittance is exactly what you have suggested. Of course the practical realisations have the usual experimental approximations involved.

Cheers !

-Sanjay

Sanjoy & Tony,

Thank you for your interest and for your contribution.

Are there any mathematical formulas?

Toufik,

Whatever you need is there in my earlier reply :-) :-)

-Sanjay

Dear Sanjoy,

May I know, Is there any direct way of calculating Rs and Rsh from the I-V curves ?

Sanjoy,

Do you mean:

Rs=-(dV/dI)V=V_OC

RSh=-(dV/dI)I=I_CC

No Toufik,

You are misinterpreting the series resistance part. The shunt resistance part is exactly what I stated.

Dileep: That is exactly what Toufik's question is all about, and that is exactly we are discussing here.

As I said guys, this is covered in most basic texts of PV, so just take up the ones you have access to, and you will see my earlier reply right there.

-Sanjay

Hi

If you don't want to or cannot conduct experiments to determine the parameters, you can still calculate the model parameters using only the PV panel datasheet values. For details, please have a look at:

http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6586957&newsearch=true&queryText=Parameter%20extraction%20algorithm%20for%20one-diode%20model%20of%20PV%20panels%20based%20on%20datasheet%20values

Here is the easier way to calculate #shunt resistance (Rsh) and series resistance (Rs) and # for #PV Panels using origin software

https://youtu.be/j9on6UphVik