Undefined variables when importing

  • Francisco
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26 Apr 2021 18:21 #9524 by Francisco
Undefined variables when importing was created by Francisco
Dear community,

I need your help please. I have created two simulations in SAM, one PV and the other CSP, then I took the code to Python 3. So far there is no problem. I can see the results in my IDE. However, since the generation is not in the code, I added in each file:
gen_pv = ssc.data_get_array (data, b'gen ');
gen_csp = ssc.data_get_array (data, b'gen ');
And I can also see the hourly generation without problems.
The problem is when from a file (for example CSP.py), I want to call the generation of the other file (gen_pv). That is, I want to import the variable from one file to another.
For example, in the CSP.py file I call a variable from PV.py
from PV import *
There I have "NameError: name 'gen_pv' is not defined".
Each one separately works fine when I add gen_pv and gen_csp, but when I want to import variables, it tells me that it is undefined. The problem is clearly in these variables that I added, maybe they are not in the right place or I have to do something else, like define them.
I hope I was clear.
I attach all the files, in case someone can help me, please.
Thank you very much in advance,
Francisco

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  • Paul Gilman
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26 Apr 2021 18:34 #9526 by Paul Gilman
Replied by Paul Gilman on topic Undefined variables when importing
Hi Francisco,

This seems like a Python coding question rather than a question about SAM.

Be sure to run the SSC simulation before trying to read the value of 'gen'. Your code should follow these steps:

1. Set inputs for the CSP model.

2. Run a simulation for the CSP model.

3. Store the CSP model generation data.

4. Repeat Steps 1-3 for the PV model.

5. Add the generation data from the two models.

Best regards,
Paul.

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  • Francisco
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26 Apr 2021 19:04 #9527 by Francisco
Replied by Francisco on topic Undefined variables when importing
Thank you dear Paul,
I use the default values in the code, which are the ones brought from SAM. With that I can get results without problems. Should I enter any other input?
The problem is when I add new lines of code, which do not come from the original code generated by SAM.
Request the hourly generation as:
gen_pv = ssc.data_get_array (data, b'gen ')
do you think it's okay?
Thanks

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  • Paul Gilman
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26 Apr 2021 19:27 #9528 by Paul Gilman
Replied by Paul Gilman on topic Undefined variables when importing
Hi Francisco,

That should work, provided you ran a simulation for the pvsamv1 (or pvwattsv7) module before making that variable assignment.

Best regards,
Paul.

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