PVsyst's forum

Welcome on PVsyst's forum.
It is currently Tue Aug 04, 2020 11:03 am

All times are UTC+02:00




Post new topic  Reply to topic  [ 2 posts ] 
Author Message
PostPosted: Wed Feb 20, 2013 8:04 pm 

Joined: Wed Feb 20, 2013 7:40 pm
Posts: 2
Curious to know the explanation for the following obsveration.

Simulation A: only modified variable is rather than a near shadings 3-d model created, under "orientation", the field type of unlimiated sheds is selected. Same pitch, inactive band widths, electrical effect is selected with 2 modules in width.

Simulation B: only modified variable is rather than unlimited sheds selected, "fixed tilted plane' is chosen. And a 3-d model is created in the near shadings option. Pv plane in sheds is created. Same pitch, inactive band widths, etc. Partition in module chains is selected as well with 2 strings in height.

*all other system losses and configurations are held the same. I'm observing a varied lower outputs from Simulation B when compared to Simulation A. Sometimes as small as .38%, but other times greater. I'm guessing the Simulation B could be considered a more "accurate" representation?

Your insight would be appreciated.


Top
   
PostPosted: Thu Jul 11, 2013 3:53 pm 

Joined: Thu Jul 19, 2012 5:20 pm
Posts: 5
With "unlimited sheds", the string power decreased linearily while the buttom cell row is being shaded. The beam component of radiation is reduced by the ratio of the shaded cell area to the full cell area.
This is the correct electrical behaviour if unshaded and shaded strings are connected in parallel (MPP voltage is determined by the unshaded string, no bypass diodes are involved)

With 3D, the irradiance of the buttom string will be reduced immediately by the beam component as soon as the buttom cell row is affected by a shadow.

In PVsyst 6.0, "According to module layout" combines the best of 3D and "unlimited sheds".


Top
   
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