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ModelChain disregards diffuse optical losses for non-Sandia modules

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还没有人认领这个 Issue。

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Issue 类型
功能
描述清晰度
基本清楚
活跃度
停滞
技术栈
python
领域
backend

调研方向

Start with the effective_irradiance_model function in pvlib/modelchain.py, which applies the FD module parameter to poa_diffuse and defaults to 1. Then read martin_ruiz_diffuse and marion_diffuse in pvlib/iam.py to see what they return. The open question is how to choose a diffuse loss model for non-Sandia modules, which the thread does not settle, so agree on that with maintainers before writing code.

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描述

Is your feature request related to a problem? Please describe.
modelchain.ModelChain and modelchain.ModelChain.with_pvwatts only consider optical losses for diffuse irradiance for modules from the Sandia Database, which contain an FD parameter for this. This can be seen in the effective_irradiance_model function in here.

def effective_irradiance_model(self):
def _eff_irrad(module_parameters, total_irrad, spect_mod, aoi_mod):
fd = module_parameters.get('FD', 1.)
return spect_mod * (total_irrad['poa_direct'] * aoi_mod +
fd * total_irrad['poa_diffuse'])

In my opinion, this is relevant for pvwatts approach. Not sure for more detailed approaches like single-diode model, etc.

Describe the solution you'd like
pvlib already contains well-established functions to compute diffuse irradiance losses such as the Martin-Ruiz and Marion's models. Would "just" be a matter of implementing them in the modelchain workflow.

Additional context
Even for Sandia modules, could it make sense to allow users to replace the FD constant by values from the Martin-Ruiz or Marion models?

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