PVsyst's forum

Welcome on PVsyst's forum.
It is currently Mon Jun 21, 2021 3:22 pm

All times are UTC+02:00

Post new topic  Reply to topic  [ 2 posts ] 
Author Message
PostPosted: Mon Jun 15, 2020 6:06 pm 

Joined: Mon Jun 15, 2020 5:11 pm
Posts: 1

In the "Graphical tool for determining the effect of parameter mismatch" the 2 independent parameters are: Isc and Voc.

If a pair of Isc and Voc is enough to create IV curves, it means all the other single-diode parameters are dependent or kept constant to the avg. module characteristics.

How are the other parameters calculated? Which are free and which are constant?

My guess is that:

- Constant to the module .pan values:
gamma_ref, alpha_isc (isc temp coefficient), mu_gamma, rsh_ref, rsh_0 and rsh_exp.

- Pmpp is dependent to Isc and Voc through the fill factor FF.

- I_ph, I_0 and rs_ref are the other dependent parameters: calculated with the equations of the single-diode system by
making the IV curve pass by Pmpp, Isc and Voc from above.

Is it right? or do you keep other parameters constant?

Thank you very much for your support,


PostPosted: Sat Aug 08, 2020 8:18 pm 
User avatar

Joined: Mon Apr 16, 2012 7:29 pm
Posts: 1686
In fact in this tool, we don't need the full one-diode model as the addition of I/V curves is only done at STC values.

Therefore PVsyst simply performs a scaling of the I/V curve in voltage and current, with respect to the original model.
This is an approximation, however probably largely sufficient for such an "uncertain" random calculation.

Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 2 posts ] 

All times are UTC+02:00

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Limited