def test_CPVSystem_get_irradiance():
cpv_system = cpvsystem.CPVSystem()
times = pd.date_range(start='20160101 1200-0700',
end='20160101 1800-0700',
freq='6H')
location = pvlib.location.Location(latitude=32, longitude=-111)
solar_position = location.get_solarposition(times)
irrads = pd.DataFrame({
'dni': [900, 0],
'ghi': [600, 0],
'dhi': [100, 0]
},
index=times)
irradiance = cpv_system.get_irradiance(solar_position['apparent_zenith'],
solar_position['azimuth'],
irrads['dni'], irrads['ghi'],
irrads['dhi'])
expected = pd.DataFrame(data=np.array(
[[992.902225, 841.741664, 151.160560, 137.869177, 13.291383],
[0., -0., 0., 0., 0.]]),
columns=[
'poa_global', 'poa_direct', 'poa_diffuse',
'poa_sky_diffuse', 'poa_ground_diffuse'
],
index=times)
pd.testing.assert_frame_equal(irradiance, expected, rtol=0.0001)
def test_CPVSystem_get_tempair_util_factor():
cpv_system = cpvsystem.CPVSystem(module_parameters=mod_params_cpv)
times = pd.date_range(start='20160101 1200',
end='20160101 1500',
freq='3H')
temp_air = pd.Series(data=np.array([5, 35]), index=times)
ta_uf = cpv_system.get_am_util_factor(temp_air)
expected = pd.Series(data=np.array([0.986546, 0.038553]), index=times)
pd.testing.assert_series_equal(ta_uf, expected, rtol=0.0001)
def test_CPVSystem_get_am_util_factor():
cpv_system = cpvsystem.CPVSystem(module_parameters=mod_params_cpv)
times = pd.date_range(start='20160101 1200',
end='20160101 1500',
freq='3H')
airmass_absolute = pd.Series(data=np.array([2.056997, 3.241064]),
index=times)
am_uf = cpv_system.get_am_util_factor(airmass_absolute)
expected = pd.Series(data=np.array([0.989757, 0.994575]), index=times)
pd.testing.assert_series_equal(am_uf, expected, rtol=0.0001)
def test_CPVSystem_get_global_utilization_factor():
cpv_system = cpvsystem.CPVSystem(module_parameters=mod_params_cpv)
times = pd.date_range(start='20160101 1200',
end='20160101 1500',
freq='3H')
airmass_absolute = pd.Series(data=np.array([2.056997, 3.241064]),
index=times)
temp_air = pd.Series(data=np.array([5, 35]), index=times)
uf_global = cpv_system.get_global_utilization_factor(
airmass_absolute, temp_air)
expected = pd.Series(data=np.array([0.822522, 0.940439]), index=times)
pd.testing.assert_series_equal(uf_global, expected, rtol=0.0001)
def test_CPVSystem_pvsyst_celltemp(mocker):
parameter_set = 'freestanding'
temp_model_params = pvlib.temperature.TEMPERATURE_MODEL_PARAMETERS[
'pvsyst'][parameter_set]
cpv_system = cpvsystem.CPVSystem(
module_parameters=mod_params_cpv,
temperature_model_parameters=temp_model_params)
irrad = 800
temp = 45
wind = 0.5
mocker.spy(pvlib.temperature, 'pvsyst_cell')
out = cpv_system.pvsyst_celltemp(irrad, temp, wind)
pvlib.temperature.pvsyst_cell.assert_called_once_with(
irrad, temp, wind, temp_model_params['u_c'], temp_model_params['u_v'],
mod_params_cpv['eta_m'], mod_params_cpv['alpha_absorption'])
assert np.round(out, 4) == 61.8828