capetools 🕶

A set of python 🐍 tools to process and model PV

I put together a set of tools used to clean data and model bifacial systems using pvfactors, pvlib and bifacialvf 🌞

Install

As of 02/2019: bifacialvf has not yet merged this PR, the simulate function cannot take arbitrary metereological data on the form of pandas DataFrames. So we are force to install a custom fork of bifacialvf from here. This is way, a formal release of capetools to PyPI is not possible rght now, so we have to install by cloning from github.

The recommended method is to install capetools on a conda envirnment. Ideally create a conda env with python 3.6 and then clone and install using pip.

conda create --name=your_env_name python=3.7

git clone https://github.com/tcapelle/capetools/

go inside the cloned capetools repo and do:

pip install .

or on editable mode, git clone this repo, and from within the repo install using:

pip install -e .

Getting started 💪

from capetools.imports import *
from capetools.utils.missing import *
from capetools.utils.tmy import read_pvgis
from capetools.modelling.mypvfactors import *
from capetools.modelling.mybifacialvf import *

PATH = Path.cwd().parent/'data'
fname = PATH/'pvgis_tmy_chambery.csv'

We will ingest a PVGIS downloaded file for Chambery

gps_data, months, tmy_data = read_pvgis(fname)

tmy_data.head()

.dataframe tbody tr th {
    vertical-align: top;
}

.dataframe thead th {
    text-align: right;
}

We can quickly look at missing data:

plot_missing(tmy_data)

as expected, no missing data !

Simulations

pvfactors

params = system_def(n_pvrows=3); params

{'n_pvrows': 3,
 'pvrow_height': 1.6218180900789148,
 'pvrow_width': 2.02,
 'tracking': False,
 'axis_azimuth': 0,
 'surface_tilt': 38,
 'surface_azimuth': 180,
 'albedo': 0.4,
 'gcr': 0.5,
 'rho_front_pvrow': 0.075,
 'rho_back_pvrow': 0.075,
 'cut': {0: {'front': 1, 'back': 7},
  1: {'front': 1, 'back': 7},
  2: {'front': 1, 'back': 7}}}

data = get_data(fname, params)

pvarray = run_pvfactors_simulation(data, params)

/home/tc256760/anaconda3/envs/fastai/lib/python3.7/site-packages/pvfactors/viewfactors/vfmethods.py:181: RuntimeWarning: invalid value encountered in true_divide
  vf_pvrow_to_gnd_surf * pvrow_surf_length / gnd_surf_length, 0.)
/home/tc256760/anaconda3/envs/fastai/lib/python3.7/site-packages/pvfactors/viewfactors/vfmethods.py:181: RuntimeWarning: divide by zero encountered in true_divide
  vf_pvrow_to_gnd_surf * pvrow_surf_length / gnd_surf_length, 0.)
/home/tc256760/anaconda3/envs/fastai/lib/python3.7/site-packages/pvfactors/viewfactors/vfmethods.py:531: RuntimeWarning: divide by zero encountered in true_divide
  vf_1_to_2 = (d1 + d2 - l1 - l2) / (2. * width)
/home/tc256760/anaconda3/envs/fastai/lib/python3.7/site-packages/pvfactors/viewfactors/vfmethods.py:531: RuntimeWarning: invalid value encountered in true_divide
  vf_1_to_2 = (d1 + d2 - l1 - l2) / (2. * width)
/home/tc256760/anaconda3/envs/fastai/lib/python3.7/site-packages/pvfactors/viewfactors/vfmethods.py:607: RuntimeWarning: invalid value encountered in true_divide
  vf_1_to_2 = np.abs(sum_2 - sum_1) / (2. * width_1)
/home/tc256760/anaconda3/envs/fastai/lib/python3.7/site-packages/pvfactors/viewfactors/vfmethods.py:222: RuntimeWarning: invalid value encountered in true_divide
  vf_i_to_j * length_i / length_j, 0.)

ax = plot_idx(pvarray)
ax.set_xlim(-2, 10)

(-2, 10)

res_pvfactors = individual_report(pvarray, index=data.index)

res_pvfactors.head()

.dataframe tbody tr th {
    vertical-align: top;
}

.dataframe thead th {
    text-align: right;
}

res_pvfactors['21 June 2019'].plot();

bifacialvf

res_bifacialvf = run_bifacialvf_simulation(data)

  0%|          | 0/8760 [00:00<?, ?it/s]/home/tc256760/Apps/bifacialvf/bifacialvf/vf.py:300: RuntimeWarning: divide by zero encountered in double_scalars
  projectedX2 = PcellX + np.float64(PcellY) / math.tan(startElvDown);      # Projection of ElvDown to ground in +x direction (X1 and X2 opposite nomenclature for front irradiance method)
  0%|          | 40/8760 [00:00<00:22, 379.91it/s]


********* 
Running Simulation for TMY3:  Chambery
Location:   Chambery
Lat:  45.637001  Long:  5.881  Tz  -1.0
Parameters: beta:  0   Sazm:  180   Height:  0.5   rtr separation:  8.0   Row type:  interior   Albedo:  0.4
Saving into output.csv




100%|██████████| 8760/8760 [00:27<00:00, 314.85it/s]

Finished

res_bifacialvf['21 June 2019'].plot();

Coontributing 👇

Read nbdev documentation please.