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test_pvsystem.py
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from collections import OrderedDict
import itertools
import numpy as np
from numpy import nan, array
import pandas as pd
import pytest
from .conftest import (
assert_series_equal, assert_frame_equal, fail_on_pvlib_version)
from numpy.testing import assert_allclose
import unittest.mock as mock
from pvlib import inverter, pvsystem
from pvlib import atmosphere
from pvlib import iam as _iam
from pvlib import irradiance
from pvlib.location import Location
from pvlib.pvsystem import FixedMount
from pvlib import temperature
from pvlib._deprecation import pvlibDeprecationWarning
from pvlib.tools import cosd
@pytest.mark.parametrize('iam_model,model_params', [
('ashrae', {'b': 0.05}),
('physical', {'K': 4, 'L': 0.002, 'n': 1.526}),
('martin_ruiz', {'a_r': 0.16}),
])
def test_PVSystem_get_iam(mocker, iam_model, model_params):
m = mocker.spy(_iam, iam_model)
system = pvsystem.PVSystem(module_parameters=model_params)
thetas = 1
iam = system.get_iam(thetas, iam_model=iam_model)
m.assert_called_with(thetas, **model_params)
assert iam < 1.
def test_PVSystem_multi_array_get_iam():
model_params = {'b': 0.05}
system = pvsystem.PVSystem(
arrays=[pvsystem.Array(mount=pvsystem.FixedMount(0, 180),
module_parameters=model_params),
pvsystem.Array(mount=pvsystem.FixedMount(0, 180),
module_parameters=model_params)]
)
iam = system.get_iam((1, 5), iam_model='ashrae')
assert len(iam) == 2
assert iam[0] != iam[1]
with pytest.raises(ValueError,
match="Length mismatch for per-array parameter"):
system.get_iam((1,), iam_model='ashrae')
def test_PVSystem_get_iam_sapm(sapm_module_params, mocker):
system = pvsystem.PVSystem(module_parameters=sapm_module_params)
mocker.spy(_iam, 'sapm')
aoi = 0
out = system.get_iam(aoi, 'sapm')
_iam.sapm.assert_called_once_with(aoi, sapm_module_params)
assert_allclose(out, 1.0, atol=0.01)
def test_PVSystem_get_iam_interp(sapm_module_params, mocker):
system = pvsystem.PVSystem(module_parameters=sapm_module_params)
with pytest.raises(ValueError):
system.get_iam(45, iam_model='interp')
def test__normalize_sam_product_names():
BAD_NAMES = [' -.()[]:+/",', 'Module[1]']
NORM_NAMES = ['____________', 'Module_1_']
norm_names = pvsystem._normalize_sam_product_names(BAD_NAMES)
assert list(norm_names) == NORM_NAMES
BAD_NAMES = ['Module[1]', 'Module(1)']
NORM_NAMES = ['Module_1_', 'Module_1_']
with pytest.warns(UserWarning):
norm_names = pvsystem._normalize_sam_product_names(BAD_NAMES)
assert list(norm_names) == NORM_NAMES
BAD_NAMES = ['Module[1]', 'Module[1]']
NORM_NAMES = ['Module_1_', 'Module_1_']
with pytest.warns(UserWarning):
norm_names = pvsystem._normalize_sam_product_names(BAD_NAMES)
assert list(norm_names) == NORM_NAMES
def test_PVSystem_get_iam_invalid(sapm_module_params, mocker):
system = pvsystem.PVSystem(module_parameters=sapm_module_params)
with pytest.raises(ValueError):
system.get_iam(45, iam_model='not_a_model')
def test_retrieve_sam_raise_no_parameters():
"""
Raise an exception if no parameters are provided to `retrieve_sam()`.
"""
with pytest.raises(ValueError) as error:
pvsystem.retrieve_sam()
assert 'A name or path must be provided!' == str(error.value)
def test_retrieve_sam_cecmod():
"""
Test the expected data is retrieved from the CEC module database. In
particular, check for a known module in the database and check for the
expected keys for that module.
"""
data = pvsystem.retrieve_sam('cecmod')
keys = [
'BIPV',
'Date',
'T_NOCT',
'A_c',
'N_s',
'I_sc_ref',
'V_oc_ref',
'I_mp_ref',
'V_mp_ref',
'alpha_sc',
'beta_oc',
'a_ref',
'I_L_ref',
'I_o_ref',
'R_s',
'R_sh_ref',
'Adjust',
'gamma_r',
'Version',
'STC',
'PTC',
'Technology',
'Bifacial',
'Length',
'Width',
]
module = 'Itek_Energy_LLC_iT_300_HE'
assert module in data
assert set(data[module].keys()) == set(keys)
def test_retrieve_sam_cecinverter():
"""
Test the expected data is retrieved from the CEC inverter database. In
particular, check for a known inverter in the database and check for the
expected keys for that inverter.
"""
data = pvsystem.retrieve_sam('cecinverter')
keys = [
'Vac',
'Paco',
'Pdco',
'Vdco',
'Pso',
'C0',
'C1',
'C2',
'C3',
'Pnt',
'Vdcmax',
'Idcmax',
'Mppt_low',
'Mppt_high',
'CEC_Date',
'CEC_Type',
]
inverter = 'Yaskawa_Solectria_Solar__PVI_5300_208__208V_'
assert inverter in data
assert set(data[inverter].keys()) == set(keys)
def test_sapm(sapm_module_params):
times = pd.date_range(start='2015-01-01', periods=5, freq='12H')
effective_irradiance = pd.Series([-1000, 500, 1100, np.nan, 1000],
index=times)
temp_cell = pd.Series([10, 25, 50, 25, np.nan], index=times)
out = pvsystem.sapm(effective_irradiance, temp_cell, sapm_module_params)
expected = pd.DataFrame(np.array(
[[ -5.0608322 , -4.65037767, nan, nan,
nan, -4.91119927, -4.15367716],
[ 2.545575 , 2.28773882, 56.86182059, 47.21121608,
108.00693168, 2.48357383, 1.71782772],
[ 5.65584763, 5.01709903, 54.1943277 , 42.51861718,
213.32011294, 5.52987899, 3.48660728],
[ nan, nan, nan, nan,
nan, nan, nan],
[ nan, nan, nan, nan,
nan, nan, nan]]),
columns=['i_sc', 'i_mp', 'v_oc', 'v_mp', 'p_mp', 'i_x', 'i_xx'],
index=times)
assert_frame_equal(out, expected, check_less_precise=4)
out = pvsystem.sapm(1000, 25, sapm_module_params)
expected = OrderedDict()
expected['i_sc'] = 5.09115
expected['i_mp'] = 4.5462909092579995
expected['v_oc'] = 59.260800000000003
expected['v_mp'] = 48.315600000000003
expected['p_mp'] = 219.65677305534581
expected['i_x'] = 4.9759899999999995
expected['i_xx'] = 3.1880204359100004
for k, v in expected.items():
assert_allclose(out[k], v, atol=1e-4)
# just make sure it works with Series input
pvsystem.sapm(effective_irradiance, temp_cell,
pd.Series(sapm_module_params))
def test_PVSystem_sapm(sapm_module_params, mocker):
mocker.spy(pvsystem, 'sapm')
system = pvsystem.PVSystem(module_parameters=sapm_module_params)
effective_irradiance = 500
temp_cell = 25
out = system.sapm(effective_irradiance, temp_cell)
pvsystem.sapm.assert_called_once_with(effective_irradiance, temp_cell,
sapm_module_params)
assert_allclose(out['p_mp'], 100, atol=100)
def test_PVSystem_multi_array_sapm(sapm_module_params):
system = pvsystem.PVSystem(
arrays=[pvsystem.Array(pvsystem.FixedMount(0, 180),
module_parameters=sapm_module_params),
pvsystem.Array(pvsystem.FixedMount(0, 180),
module_parameters=sapm_module_params)]
)
effective_irradiance = (100, 500)
temp_cell = (15, 25)
sapm_one, sapm_two = system.sapm(effective_irradiance, temp_cell)
assert sapm_one['p_mp'] != sapm_two['p_mp']
sapm_one_flip, sapm_two_flip = system.sapm(
(effective_irradiance[1], effective_irradiance[0]),
(temp_cell[1], temp_cell[0])
)
assert sapm_one_flip['p_mp'] == sapm_two['p_mp']
assert sapm_two_flip['p_mp'] == sapm_one['p_mp']
with pytest.raises(ValueError,
match="Length mismatch for per-array parameter"):
system.sapm(effective_irradiance, 10)
with pytest.raises(ValueError,
match="Length mismatch for per-array parameter"):
system.sapm(500, temp_cell)
@pytest.mark.parametrize('airmass,expected', [
(1.5, 1.00028714375),
(np.array([[10, np.nan]]), np.array([[0.999535, 0]])),
(pd.Series([5]), pd.Series([1.0387675]))
])
def test_sapm_spectral_loss(sapm_module_params, airmass, expected):
out = pvsystem.sapm_spectral_loss(airmass, sapm_module_params)
if isinstance(airmass, pd.Series):
assert_series_equal(out, expected, check_less_precise=4)
else:
assert_allclose(out, expected, atol=1e-4)
def test_PVSystem_sapm_spectral_loss(sapm_module_params, mocker):
mocker.spy(pvsystem, 'sapm_spectral_loss')
system = pvsystem.PVSystem(module_parameters=sapm_module_params)
airmass = 2
out = system.sapm_spectral_loss(airmass)
pvsystem.sapm_spectral_loss.assert_called_once_with(airmass,
sapm_module_params)
assert_allclose(out, 1, atol=0.5)
def test_PVSystem_multi_array_sapm_spectral_loss(sapm_module_params):
system = pvsystem.PVSystem(
arrays=[pvsystem.Array(pvsystem.FixedMount(0, 180),
module_parameters=sapm_module_params),
pvsystem.Array(pvsystem.FixedMount(0, 180),
module_parameters=sapm_module_params)]
)
loss_one, loss_two = system.sapm_spectral_loss(2)
assert loss_one == loss_two
# this test could be improved to cover all cell types.
# could remove the need for specifying spectral coefficients if we don't
# care about the return value at all
@pytest.mark.parametrize('module_parameters,module_type,coefficients', [
({'Technology': 'mc-Si'}, 'multisi', None),
({'Material': 'Multi-c-Si'}, 'multisi', None),
({'first_solar_spectral_coefficients': (
0.84, -0.03, -0.008, 0.14, 0.04, -0.002)},
None,
(0.84, -0.03, -0.008, 0.14, 0.04, -0.002))
])
def test_PVSystem_first_solar_spectral_loss(module_parameters, module_type,
coefficients, mocker):
mocker.spy(atmosphere, 'first_solar_spectral_correction')
system = pvsystem.PVSystem(module_parameters=module_parameters)
pw = 3
airmass_absolute = 3
out = system.first_solar_spectral_loss(pw, airmass_absolute)
atmosphere.first_solar_spectral_correction.assert_called_once_with(
pw, airmass_absolute, module_type, coefficients)
assert_allclose(out, 1, atol=0.5)
def test_PVSystem_multi_array_first_solar_spectral_loss():
system = pvsystem.PVSystem(
arrays=[
pvsystem.Array(
mount=pvsystem.FixedMount(0, 180),
module_parameters={'Technology': 'mc-Si'},
module_type='multisi'
),
pvsystem.Array(
mount=pvsystem.FixedMount(0, 180),
module_parameters={'Technology': 'mc-Si'},
module_type='multisi'
)
]
)
loss_one, loss_two = system.first_solar_spectral_loss(1, 3)
assert loss_one == loss_two
@pytest.mark.parametrize('test_input,expected', [
([1000, 100, 5, 45], 1140.0510967821877),
([np.array([np.nan, 1000, 1000]),
np.array([100, np.nan, 100]),
np.array([1.1, 1.1, 1.1]),
np.array([10, 10, 10])],
np.array([np.nan, np.nan, 1081.1574])),
([pd.Series([1000]), pd.Series([100]), pd.Series([1.1]),
pd.Series([10])],
pd.Series([1081.1574]))
])
def test_sapm_effective_irradiance(sapm_module_params, test_input, expected):
test_input.append(sapm_module_params)
out = pvsystem.sapm_effective_irradiance(*test_input)
if isinstance(test_input, pd.Series):
assert_series_equal(out, expected, check_less_precise=4)
else:
assert_allclose(out, expected, atol=1e-1)
def test_PVSystem_sapm_effective_irradiance(sapm_module_params, mocker):
system = pvsystem.PVSystem(module_parameters=sapm_module_params)
mocker.spy(pvsystem, 'sapm_effective_irradiance')
poa_direct = 900
poa_diffuse = 100
airmass_absolute = 1.5
aoi = 0
p = (sapm_module_params['A4'], sapm_module_params['A3'],
sapm_module_params['A2'], sapm_module_params['A1'],
sapm_module_params['A0'])
f1 = np.polyval(p, airmass_absolute)
expected = f1 * (poa_direct + sapm_module_params['FD'] * poa_diffuse)
out = system.sapm_effective_irradiance(
poa_direct, poa_diffuse, airmass_absolute, aoi)
pvsystem.sapm_effective_irradiance.assert_called_once_with(
poa_direct, poa_diffuse, airmass_absolute, aoi, sapm_module_params)
assert_allclose(out, expected, atol=0.1)
def test_PVSystem_multi_array_sapm_effective_irradiance(sapm_module_params):
system = pvsystem.PVSystem(
arrays=[pvsystem.Array(pvsystem.FixedMount(0, 180),
module_parameters=sapm_module_params),
pvsystem.Array(pvsystem.FixedMount(0, 180),
module_parameters=sapm_module_params)]
)
poa_direct = (500, 900)
poa_diffuse = (50, 100)
aoi = (0, 10)
airmass_absolute = 1.5
irrad_one, irrad_two = system.sapm_effective_irradiance(
poa_direct, poa_diffuse, airmass_absolute, aoi
)
assert irrad_one != irrad_two
@pytest.fixture
def two_array_system(pvsyst_module_params, cec_module_params):
"""Two-array PVSystem.
Both arrays are identical.
"""
temperature_model = temperature.TEMPERATURE_MODEL_PARAMETERS['sapm'][
'open_rack_glass_glass'
]
# Need u_v to be non-zero so wind-speed changes cell temperature
# under the pvsyst model.
temperature_model['u_v'] = 1.0
# parameter for fuentes temperature model
temperature_model['noct_installed'] = 45
# parameters for noct_sam temperature model
temperature_model['noct'] = 45.
temperature_model['module_efficiency'] = 0.2
module_params = {**pvsyst_module_params, **cec_module_params}
return pvsystem.PVSystem(
arrays=[
pvsystem.Array(
mount=pvsystem.FixedMount(0, 180),
temperature_model_parameters=temperature_model,
module_parameters=module_params
),
pvsystem.Array(
mount=pvsystem.FixedMount(0, 180),
temperature_model_parameters=temperature_model,
module_parameters=module_params
)
]
)
@pytest.mark.parametrize("poa_direct, poa_diffuse, aoi",
[(20, (10, 10), (20, 20)),
((20, 20), (10,), (20, 20)),
((20, 20), (10, 10), 20)])
def test_PVSystem_sapm_effective_irradiance_value_error(
poa_direct, poa_diffuse, aoi, two_array_system):
with pytest.raises(ValueError,
match="Length mismatch for per-array parameter"):
two_array_system.sapm_effective_irradiance(
poa_direct, poa_diffuse, 10, aoi
)
def test_PVSystem_sapm_celltemp(mocker):
a, b, deltaT = (-3.47, -0.0594, 3) # open_rack_glass_glass
temp_model_params = {'a': a, 'b': b, 'deltaT': deltaT}
system = pvsystem.PVSystem(temperature_model_parameters=temp_model_params)
mocker.spy(temperature, 'sapm_cell')
temps = 25
irrads = 1000
winds = 1
out = system.get_cell_temperature(irrads, temps, winds, model='sapm')
temperature.sapm_cell.assert_called_once_with(irrads, temps, winds, a, b,
deltaT)
assert_allclose(out, 57, atol=1)
def test_PVSystem_sapm_celltemp_kwargs(mocker):
temp_model_params = temperature.TEMPERATURE_MODEL_PARAMETERS['sapm'][
'open_rack_glass_glass']
system = pvsystem.PVSystem(temperature_model_parameters=temp_model_params)
mocker.spy(temperature, 'sapm_cell')
temps = 25
irrads = 1000
winds = 1
out = system.get_cell_temperature(irrads, temps, winds, model='sapm')
temperature.sapm_cell.assert_called_once_with(irrads, temps, winds,
temp_model_params['a'],
temp_model_params['b'],
temp_model_params['deltaT'])
assert_allclose(out, 57, atol=1)
def test_PVSystem_multi_array_sapm_celltemp_different_arrays():
temp_model_one = temperature.TEMPERATURE_MODEL_PARAMETERS['sapm'][
'open_rack_glass_glass']
temp_model_two = temperature.TEMPERATURE_MODEL_PARAMETERS['sapm'][
'close_mount_glass_glass']
system = pvsystem.PVSystem(
arrays=[pvsystem.Array(pvsystem.FixedMount(0, 180),
temperature_model_parameters=temp_model_one),
pvsystem.Array(pvsystem.FixedMount(0, 180),
temperature_model_parameters=temp_model_two)]
)
temp_one, temp_two = system.get_cell_temperature(
(1000, 1000), 25, 1, model='sapm'
)
assert temp_one != temp_two
def test_PVSystem_pvsyst_celltemp(mocker):
parameter_set = 'insulated'
temp_model_params = temperature.TEMPERATURE_MODEL_PARAMETERS['pvsyst'][
parameter_set]
alpha_absorption = 0.85
module_efficiency = 0.17
module_parameters = {'alpha_absorption': alpha_absorption,
'module_efficiency': module_efficiency}
system = pvsystem.PVSystem(module_parameters=module_parameters,
temperature_model_parameters=temp_model_params)
mocker.spy(temperature, 'pvsyst_cell')
irrad = 800
temp = 45
wind = 0.5
out = system.get_cell_temperature(irrad, temp, wind_speed=wind,
model='pvsyst')
temperature.pvsyst_cell.assert_called_once_with(
irrad, temp, wind_speed=wind, u_c=temp_model_params['u_c'],
u_v=temp_model_params['u_v'], module_efficiency=module_efficiency,
alpha_absorption=alpha_absorption)
assert (out < 90) and (out > 70)
def test_PVSystem_faiman_celltemp(mocker):
u0, u1 = 25.0, 6.84 # default values
temp_model_params = {'u0': u0, 'u1': u1}
system = pvsystem.PVSystem(temperature_model_parameters=temp_model_params)
mocker.spy(temperature, 'faiman')
temps = 25
irrads = 1000
winds = 1
out = system.get_cell_temperature(irrads, temps, winds, model='faiman')
temperature.faiman.assert_called_once_with(irrads, temps, winds, u0, u1)
assert_allclose(out, 56.4, atol=1)
def test_PVSystem_noct_celltemp(mocker):
poa_global, temp_air, wind_speed, noct, module_efficiency = (
1000., 25., 1., 45., 0.2)
expected = 55.230790492
temp_model_params = {'noct': noct, 'module_efficiency': module_efficiency}
system = pvsystem.PVSystem(temperature_model_parameters=temp_model_params)
mocker.spy(temperature, 'noct_sam')
out = system.get_cell_temperature(poa_global, temp_air, wind_speed,
model='noct_sam')
temperature.noct_sam.assert_called_once_with(
poa_global, temp_air, wind_speed, noct, module_efficiency,
effective_irradiance=None)
assert_allclose(out, expected)
# different types
out = system.get_cell_temperature(np.array(poa_global), np.array(temp_air),
np.array(wind_speed), model='noct_sam')
assert_allclose(out, expected)
dr = pd.date_range(start='2020-01-01 12:00:00', end='2020-01-01 13:00:00',
freq='1H')
out = system.get_cell_temperature(pd.Series(index=dr, data=poa_global),
pd.Series(index=dr, data=temp_air),
pd.Series(index=dr, data=wind_speed),
model='noct_sam')
assert_series_equal(out, pd.Series(index=dr, data=expected))
# now use optional arguments
temp_model_params.update({'transmittance_absorptance': 0.8,
'array_height': 2,
'mount_standoff': 2.0})
expected = 60.477703576
system = pvsystem.PVSystem(temperature_model_parameters=temp_model_params)
out = system.get_cell_temperature(poa_global, temp_air, wind_speed,
effective_irradiance=1100.,
model='noct_sam')
assert_allclose(out, expected)
def test_PVSystem_noct_celltemp_error():
poa_global, temp_air, wind_speed, module_efficiency = (1000., 25., 1., 0.2)
temp_model_params = {'module_efficiency': module_efficiency}
system = pvsystem.PVSystem(temperature_model_parameters=temp_model_params)
with pytest.raises(KeyError):
system.get_cell_temperature(poa_global, temp_air, wind_speed,
model='noct_sam')
@pytest.mark.parametrize("model",
['faiman', 'pvsyst', 'sapm', 'fuentes', 'noct_sam'])
def test_PVSystem_multi_array_celltemp_functions(model, two_array_system):
times = pd.date_range(start='2020-08-25 11:00', freq='H', periods=3)
irrad_one = pd.Series(1000, index=times)
irrad_two = pd.Series(500, index=times)
temp_air = pd.Series(25, index=times)
wind_speed = pd.Series(1, index=times)
temp_one, temp_two = two_array_system.get_cell_temperature(
(irrad_one, irrad_two), temp_air, wind_speed, model=model)
assert (temp_one != temp_two).all()
@pytest.mark.parametrize("model",
['faiman', 'pvsyst', 'sapm', 'fuentes', 'noct_sam'])
def test_PVSystem_multi_array_celltemp_multi_temp(model, two_array_system):
times = pd.date_range(start='2020-08-25 11:00', freq='H', periods=3)
irrad = pd.Series(1000, index=times)
temp_air_one = pd.Series(25, index=times)
temp_air_two = pd.Series(5, index=times)
wind_speed = pd.Series(1, index=times)
temp_one, temp_two = two_array_system.get_cell_temperature(
(irrad, irrad),
(temp_air_one, temp_air_two),
wind_speed,
model=model
)
assert (temp_one != temp_two).all()
temp_one_swtich, temp_two_switch = two_array_system.get_cell_temperature(
(irrad, irrad),
(temp_air_two, temp_air_one),
wind_speed,
model=model
)
assert_series_equal(temp_one, temp_two_switch)
assert_series_equal(temp_two, temp_one_swtich)
@pytest.mark.parametrize("model",
['faiman', 'pvsyst', 'sapm', 'fuentes', 'noct_sam'])
def test_PVSystem_multi_array_celltemp_multi_wind(model, two_array_system):
times = pd.date_range(start='2020-08-25 11:00', freq='H', periods=3)
irrad = pd.Series(1000, index=times)
temp_air = pd.Series(25, index=times)
wind_speed_one = pd.Series(1, index=times)
wind_speed_two = pd.Series(5, index=times)
temp_one, temp_two = two_array_system.get_cell_temperature(
(irrad, irrad),
temp_air,
(wind_speed_one, wind_speed_two),
model=model
)
assert (temp_one != temp_two).all()
temp_one_swtich, temp_two_switch = two_array_system.get_cell_temperature(
(irrad, irrad),
temp_air,
(wind_speed_two, wind_speed_one),
model=model
)
assert_series_equal(temp_one, temp_two_switch)
assert_series_equal(temp_two, temp_one_swtich)
def test_PVSystem_get_cell_temperature_invalid():
system = pvsystem.PVSystem()
with pytest.raises(ValueError, match='not a valid'):
system.get_cell_temperature(1000, 25, 1, 'not_a_model')
@pytest.mark.parametrize("model",
['faiman', 'pvsyst', 'sapm', 'fuentes', 'noct_sam'])
def test_PVSystem_multi_array_celltemp_temp_too_short(
model, two_array_system):
with pytest.raises(ValueError,
match="Length mismatch for per-array parameter"):
two_array_system.get_cell_temperature((1000, 1000), (1,), 1,
model=model)
@pytest.mark.parametrize("model",
['faiman', 'pvsyst', 'sapm', 'fuentes', 'noct_sam'])
def test_PVSystem_multi_array_celltemp_temp_too_long(
model, two_array_system):
with pytest.raises(ValueError,
match="Length mismatch for per-array parameter"):
two_array_system.get_cell_temperature((1000, 1000), (1, 1, 1), 1,
model=model)
@pytest.mark.parametrize("model",
['faiman', 'pvsyst', 'sapm', 'fuentes', 'noct_sam'])
def test_PVSystem_multi_array_celltemp_wind_too_short(
model, two_array_system):
with pytest.raises(ValueError,
match="Length mismatch for per-array parameter"):
two_array_system.get_cell_temperature((1000, 1000), 25, (1,),
model=model)
@pytest.mark.parametrize("model",
['faiman', 'pvsyst', 'sapm', 'fuentes', 'noct_sam'])
def test_PVSystem_multi_array_celltemp_wind_too_long(
model, two_array_system):
with pytest.raises(ValueError,
match="Length mismatch for per-array parameter"):
two_array_system.get_cell_temperature((1000, 1000), 25, (1, 1, 1),
model=model)
@pytest.mark.parametrize("model",
['faiman', 'pvsyst', 'sapm', 'fuentes', 'noct_sam'])
def test_PVSystem_multi_array_celltemp_poa_length_mismatch(
model, two_array_system):
with pytest.raises(ValueError,
match="Length mismatch for per-array parameter"):
two_array_system.get_cell_temperature(1000, 25, 1, model=model)
def test_PVSystem_fuentes_celltemp(mocker):
noct_installed = 45
temp_model_params = {'noct_installed': noct_installed, 'surface_tilt': 0}
system = pvsystem.PVSystem(temperature_model_parameters=temp_model_params)
spy = mocker.spy(temperature, 'fuentes')
index = pd.date_range('2019-01-01 11:00', freq='h', periods=3)
temps = pd.Series(25, index)
irrads = pd.Series(1000, index)
winds = pd.Series(1, index)
out = system.get_cell_temperature(irrads, temps, winds, model='fuentes')
assert_series_equal(spy.call_args[0][0], irrads)
assert_series_equal(spy.call_args[0][1], temps)
assert_series_equal(spy.call_args[0][2], winds)
assert spy.call_args[0][3] == noct_installed
assert_series_equal(out, pd.Series([52.85, 55.85, 55.85], index,
name='tmod'))
def test_PVSystem_fuentes_module_height(mocker):
# check that fuentes picks up Array.mount.module_height correctly
# (temperature.fuentes defaults to 5 for module_height)
array = pvsystem.Array(mount=FixedMount(module_height=3),
temperature_model_parameters={'noct_installed': 45})
spy = mocker.spy(temperature, 'fuentes')
index = pd.date_range('2019-01-01 11:00', freq='h', periods=3)
temps = pd.Series(25, index)
irrads = pd.Series(1000, index)
winds = pd.Series(1, index)
_ = array.get_cell_temperature(irrads, temps, winds, model='fuentes')
assert spy.call_args[1]['module_height'] == 3
def test_Array__infer_temperature_model_params():
array = pvsystem.Array(mount=FixedMount(0, 180,
racking_model='open_rack'),
module_parameters={},
module_type='glass_polymer')
expected = temperature.TEMPERATURE_MODEL_PARAMETERS[
'sapm']['open_rack_glass_polymer']
assert expected == array._infer_temperature_model_params()
array = pvsystem.Array(mount=FixedMount(0, 180,
racking_model='freestanding'),
module_parameters={},
module_type='glass_polymer')
expected = temperature.TEMPERATURE_MODEL_PARAMETERS[
'pvsyst']['freestanding']
assert expected == array._infer_temperature_model_params()
array = pvsystem.Array(mount=FixedMount(0, 180,
racking_model='insulated'),
module_parameters={},
module_type=None)
expected = temperature.TEMPERATURE_MODEL_PARAMETERS[
'pvsyst']['insulated']
assert expected == array._infer_temperature_model_params()
def test_Array__infer_cell_type():
array = pvsystem.Array(mount=pvsystem.FixedMount(0, 180),
module_parameters={})
assert array._infer_cell_type() is None
def test_calcparams_desoto(cec_module_params):
times = pd.date_range(start='2015-01-01', periods=3, freq='12H')
effective_irradiance = pd.Series([0.0, 800.0, 800.0], index=times)
temp_cell = pd.Series([25, 25, 50], index=times)
IL, I0, Rs, Rsh, nNsVth = pvsystem.calcparams_desoto(
effective_irradiance,
temp_cell,
alpha_sc=cec_module_params['alpha_sc'],
a_ref=cec_module_params['a_ref'],
I_L_ref=cec_module_params['I_L_ref'],
I_o_ref=cec_module_params['I_o_ref'],
R_sh_ref=cec_module_params['R_sh_ref'],
R_s=cec_module_params['R_s'],
EgRef=1.121,
dEgdT=-0.0002677)
assert_series_equal(IL, pd.Series([0.0, 6.036, 6.096], index=times),
check_less_precise=3)
assert_series_equal(I0, pd.Series([0.0, 1.94e-9, 7.419e-8], index=times),
check_less_precise=3)
assert_allclose(Rs, 0.094)
assert_series_equal(Rsh, pd.Series([np.inf, 19.65, 19.65], index=times),
check_less_precise=3)
assert_series_equal(nNsVth, pd.Series([0.473, 0.473, 0.5127], index=times),
check_less_precise=3)
def test_calcparams_cec(cec_module_params):
times = pd.date_range(start='2015-01-01', periods=3, freq='12H')
effective_irradiance = pd.Series([0.0, 800.0, 800.0], index=times)
temp_cell = pd.Series([25, 25, 50], index=times)
IL, I0, Rs, Rsh, nNsVth = pvsystem.calcparams_cec(
effective_irradiance,
temp_cell,
alpha_sc=cec_module_params['alpha_sc'],
a_ref=cec_module_params['a_ref'],
I_L_ref=cec_module_params['I_L_ref'],
I_o_ref=cec_module_params['I_o_ref'],
R_sh_ref=cec_module_params['R_sh_ref'],
R_s=cec_module_params['R_s'],
Adjust=cec_module_params['Adjust'],
EgRef=1.121,
dEgdT=-0.0002677)
assert_series_equal(IL, pd.Series([0.0, 6.036, 6.0896], index=times),
check_less_precise=3)
assert_series_equal(I0, pd.Series([0.0, 1.94e-9, 7.419e-8], index=times),
check_less_precise=3)
assert_allclose(Rs, 0.094)
assert_series_equal(Rsh, pd.Series([np.inf, 19.65, 19.65], index=times),
check_less_precise=3)
assert_series_equal(nNsVth, pd.Series([0.473, 0.473, 0.5127], index=times),
check_less_precise=3)
def test_calcparams_cec_extra_params_propagation(cec_module_params, mocker):
"""
See bug #1215.
When calling `calcparams_cec`, the parameters `EgRef`, `dEgdT`, `irrad_ref`
and `temp_ref` must not be ignored.
Since, internally, this function is calling `calcparams_desoto`, this test
checks that the latter is called with the expected parameters instead of
some default values.
"""
times = pd.date_range(start='2015-01-01', periods=3, freq='12H')
effective_irradiance = pd.Series([0.0, 800.0, 800.0], index=times)
temp_cell = pd.Series([25, 25, 50], index=times)
extra_parameters = dict(
EgRef=1.123,
dEgdT=-0.0002688,
irrad_ref=1100,
temp_ref=23,
)
m = mocker.spy(pvsystem, 'calcparams_desoto')
pvsystem.calcparams_cec(
effective_irradiance=effective_irradiance,
temp_cell=temp_cell,
alpha_sc=cec_module_params['alpha_sc'],
a_ref=cec_module_params['a_ref'],
I_L_ref=cec_module_params['I_L_ref'],
I_o_ref=cec_module_params['I_o_ref'],
R_sh_ref=cec_module_params['R_sh_ref'],
R_s=cec_module_params['R_s'],
Adjust=cec_module_params['Adjust'],
**extra_parameters,
)
assert m.call_count == 1
assert m.call_args[1] == extra_parameters
def test_calcparams_pvsyst(pvsyst_module_params):
times = pd.date_range(start='2015-01-01', periods=2, freq='12H')
effective_irradiance = pd.Series([0.0, 800.0], index=times)
temp_cell = pd.Series([25, 50], index=times)
IL, I0, Rs, Rsh, nNsVth = pvsystem.calcparams_pvsyst(
effective_irradiance,
temp_cell,
alpha_sc=pvsyst_module_params['alpha_sc'],
gamma_ref=pvsyst_module_params['gamma_ref'],
mu_gamma=pvsyst_module_params['mu_gamma'],
I_L_ref=pvsyst_module_params['I_L_ref'],
I_o_ref=pvsyst_module_params['I_o_ref'],
R_sh_ref=pvsyst_module_params['R_sh_ref'],
R_sh_0=pvsyst_module_params['R_sh_0'],
R_s=pvsyst_module_params['R_s'],
cells_in_series=pvsyst_module_params['cells_in_series'],
EgRef=pvsyst_module_params['EgRef'])
assert_series_equal(
IL.round(decimals=3), pd.Series([0.0, 4.8200], index=times))
assert_series_equal(
I0.round(decimals=3), pd.Series([0.0, 1.47e-7], index=times))
assert_allclose(Rs, 0.500)
assert_series_equal(
Rsh.round(decimals=3), pd.Series([1000.0, 305.757], index=times))
assert_series_equal(
nNsVth.round(decimals=4), pd.Series([1.6186, 1.7961], index=times))
def test_PVSystem_calcparams_desoto(cec_module_params, mocker):
mocker.spy(pvsystem, 'calcparams_desoto')
module_parameters = cec_module_params.copy()
module_parameters['EgRef'] = 1.121
module_parameters['dEgdT'] = -0.0002677
system = pvsystem.PVSystem(module_parameters=module_parameters)
effective_irradiance = np.array([0, 800])
temp_cell = 25
IL, I0, Rs, Rsh, nNsVth = system.calcparams_desoto(effective_irradiance,
temp_cell)
pvsystem.calcparams_desoto.assert_called_once_with(
effective_irradiance,
temp_cell,
alpha_sc=cec_module_params['alpha_sc'],
a_ref=cec_module_params['a_ref'],
I_L_ref=cec_module_params['I_L_ref'],
I_o_ref=cec_module_params['I_o_ref'],
R_sh_ref=cec_module_params['R_sh_ref'],
R_s=cec_module_params['R_s'],
EgRef=module_parameters['EgRef'],
dEgdT=module_parameters['dEgdT'])
assert_allclose(IL, np.array([0.0, 6.036]), atol=1)
assert_allclose(I0, 2.0e-9, atol=1.0e-9)
assert_allclose(Rs, 0.1, atol=0.1)
assert_allclose(Rsh, np.array([np.inf, 20]), atol=1)
assert_allclose(nNsVth, 0.5, atol=0.1)
def test_PVSystem_calcparams_pvsyst(pvsyst_module_params, mocker):
mocker.spy(pvsystem, 'calcparams_pvsyst')
module_parameters = pvsyst_module_params.copy()
system = pvsystem.PVSystem(module_parameters=module_parameters)
effective_irradiance = np.array([0, 800])
temp_cell = np.array([25, 50])
IL, I0, Rs, Rsh, nNsVth = system.calcparams_pvsyst(effective_irradiance,
temp_cell)
pvsystem.calcparams_pvsyst.assert_called_once_with(
effective_irradiance,
temp_cell,
alpha_sc=pvsyst_module_params['alpha_sc'],
gamma_ref=pvsyst_module_params['gamma_ref'],
mu_gamma=pvsyst_module_params['mu_gamma'],
I_L_ref=pvsyst_module_params['I_L_ref'],
I_o_ref=pvsyst_module_params['I_o_ref'],
R_sh_ref=pvsyst_module_params['R_sh_ref'],
R_sh_0=pvsyst_module_params['R_sh_0'],
R_s=pvsyst_module_params['R_s'],
cells_in_series=pvsyst_module_params['cells_in_series'],
EgRef=pvsyst_module_params['EgRef'],
R_sh_exp=pvsyst_module_params['R_sh_exp'])
assert_allclose(IL, np.array([0.0, 4.8200]), atol=1)
assert_allclose(I0, np.array([0.0, 1.47e-7]), atol=1.0e-5)
assert_allclose(Rs, 0.5, atol=0.1)
assert_allclose(Rsh, np.array([1000, 305.757]), atol=50)
assert_allclose(nNsVth, np.array([1.6186, 1.7961]), atol=0.1)
@pytest.mark.parametrize('calcparams', [pvsystem.PVSystem.calcparams_pvsyst,
pvsystem.PVSystem.calcparams_desoto,
pvsystem.PVSystem.calcparams_cec])
def test_PVSystem_multi_array_calcparams(calcparams, two_array_system):
params_one, params_two = calcparams(
two_array_system, (1000, 500), (30, 20)
)
assert params_one != params_two
@pytest.mark.parametrize('calcparams, irrad, celltemp',
[ (f, irrad, celltemp)
for f in (pvsystem.PVSystem.calcparams_desoto,
pvsystem.PVSystem.calcparams_cec,
pvsystem.PVSystem.calcparams_pvsyst)
for irrad, celltemp in [(1, (1, 1)), ((1, 1), 1)]])
def test_PVSystem_multi_array_calcparams_value_error(
calcparams, irrad, celltemp, two_array_system):
with pytest.raises(ValueError,
match='Length mismatch for per-array parameter'):
calcparams(two_array_system, irrad, celltemp)
@pytest.fixture(params=[
{ # Can handle all python scalar inputs
'Rsh': 20.,
'Rs': 0.1,
'nNsVth': 0.5,
'I': 3.,
'I0': 6.e-7,
'IL': 7.,
'V_expected': 7.5049875193450521
},
{ # Can handle all rank-0 array inputs
'Rsh': np.array(20.),
'Rs': np.array(0.1),
'nNsVth': np.array(0.5),
'I': np.array(3.),
'I0': np.array(6.e-7),
'IL': np.array(7.),
'V_expected': np.array(7.5049875193450521)
},
{ # Can handle all rank-1 singleton array inputs
'Rsh': np.array([20.]),
'Rs': np.array([0.1]),
'nNsVth': np.array([0.5]),
'I': np.array([3.]),
'I0': np.array([6.e-7]),
'IL': np.array([7.]),
'V_expected': np.array([7.5049875193450521])
},
{ # Can handle all rank-1 non-singleton array inputs with infinite shunt
# resistance, Rsh=inf gives V=Voc=nNsVth*(np.log(IL + I0) - np.log(I0)
# at I=0
'Rsh': np.array([np.inf, 20.]),
'Rs': np.array([0.1, 0.1]),
'nNsVth': np.array([0.5, 0.5]),
'I': np.array([0., 3.]),
'I0': np.array([6.e-7, 6.e-7]),
'IL': np.array([7., 7.]),
'V_expected': np.array([0.5*(np.log(7. + 6.e-7) - np.log(6.e-7)),
7.5049875193450521])
},
{ # Can handle mixed inputs with a rank-2 array with infinite shunt
# resistance, Rsh=inf gives V=Voc=nNsVth*(np.log(IL + I0) - np.log(I0)
# at I=0
'Rsh': np.array([np.inf, np.inf]),
'Rs': np.array([0.1]),
'nNsVth': np.array(0.5),
'I': 0.,
'I0': np.array([6.e-7]),