Perez model in Infinite Sheds

[roshni agrawal]

Hi everyone,

Infinite shed model supports two models - 'isotropic' and 'haydavies'. 

Is there any reason why 'perez' or other irradiance model are not supported in it like this method pvlib.irradiance.get_total_irradiance — pvlib python 0.13.0 documentation? 

Kind regards,

Roshni

[kevina...@gmail.com]

One reason is a conceptual barrier.  The Perez (and Klucher, Reindl) models represent three forms of diffuse irradiance: circumsolar, isotropic, and horizon band.  pvlib's infinite sheds model understands only the circumsolar and isotropic components, so it's not obvious how to bring Perez into infinite sheds.  In contrast, hay-davies and isotropic don't consider the horizon band, so they fit naturally into the infinite sheds model.

However, we are looking into integrating Perez with infinite sheds as part of a broader set of improvements to the infinite sheds model.  The intent is to include those improvements in a future version of pvlib, but there is no concrete timeline for that yet.

Kevin

[Anton Driesse]

For moderately tilted systems (especially in large arrays) the horizon band contributions is minimal, so conceptually you could use Perez in those cases by ignoring that band.

A programmatic work-around could be to select the model 'isotropic' (which does nothing inside the infinite-shed model) and pre-process the DNI and DHI inputs using any other transposition model (e.g. Perez).

Anton

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[roshni agrawal]

Thanks Kevin and Anton taking the time to answer my questions. Your response really helped me understand reasoning behind Perez and Infinite sheds model better. 

I'm  interested to contributing to Perez implementation in Infinite sheds and other improvements in pvlib.  Please let me know how I can best get involved.

Kind regards,

Roshni

[Echedey Luis Álvarez]

Hey Roshni!
It's good to hear you want to get involved :)

I suggest you start by checking our GitHub repo, where development is centralized. https://github.com/pvlib/pvlib-python
Specifically, in the issues tab you can find bugs or enhancements. My recommendation is to start with a small contribution (for example a typo), then move to bigger things.
It's good if have a look at https://pvlib-python.readthedocs.io/en/stable/contributing/index.html as a reference.

Example issues to start with:
- https://github.com/pvlib/pvlib-python/issues/2230
- https://github.com/pvlib/pvlib-python/issues/2161
- https://github.com/pvlib/pvlib-python/issues/2255

If you feel confident, go straight ahead, but there are some Continuous Integration/Development tools that are nice to have sorted out.

Feel free to reach out.

Best,
Echedey.

To view this discussion visit https://groups.google.com/d/msgid/pvlib-python/909b2886-225d-400b-b851-3692d8dfbd38n%40googlegroups.com.