def _get_poa(data, solar_position):
"""
Return the radiation adjusted to
Plane of Array (SkyDiffuse, GroundDiffuse, Total).
"""
extra_radiation = get_extra_radiation(data.data.index)
# Best orientation for pv system
surface_tilt = _surface_tilt(data.latitude)
surface_azimuth = _surface_azimuth(data.latitude)
# Sky Diffuse radiation (From PvLib)
poa_diffuse = haydavies(surface_tilt=surface_tilt,
surface_azimuth=surface_azimuth,
dhi=data.data['Gd(h)'],
dni=data.data['Gb(n)'],
dni_extra=extra_radiation,
solar_zenith=solar_position.apparent_zenith,
solar_azimuth=solar_position.azimuth)
# Ground Diffuse radiation (From PvLib)
poa_ground = get_ground_diffuse(data.latitude,
data.data['G(h)'],
surface_type='urban')
# Angle of incidence at best orientation
_aoi = aoi(surface_tilt=surface_tilt,
surface_azimuth=surface_azimuth,
solar_zenith=solar_position.apparent_zenith,
solar_azimuth=solar_position.apparent_zenith)
# Total radiation at plane of the pv array.
poa_total = poa_components(aoi=_aoi,
dni=data.data['Gb(n)'],
poa_sky_diffuse=poa_diffuse,
poa_ground_diffuse=poa_ground)
return poa_total, _aoi
def test_poa_components(irrad_data, ephem_data, dni_et, relative_airmass):
aoi = irradiance.aoi(40, 180, ephem_data['apparent_zenith'],
ephem_data['azimuth'])
gr_sand = irradiance.get_ground_diffuse(40,
irrad_data['ghi'],
surface_type='sand')
diff_perez = irradiance.perez(40, 180, irrad_data['dhi'],
irrad_data['dni'], dni_et,
ephem_data['apparent_zenith'],
ephem_data['azimuth'], relative_airmass)
out = irradiance.poa_components(aoi, irrad_data['dni'], diff_perez,
gr_sand)
expected = pd.DataFrame(np.array(
[[0., -0., 0., 0., 0.],
[35.19456561, 0., 35.19456561, 31.4635077, 3.73105791],
[956.18253696, 798.31939281, 157.86314414, 109.08433162, 48.77881252],
[90.99624896, 33.50143401, 57.49481495, 45.45978964, 12.03502531]]),
columns=[
'poa_global', 'poa_direct', 'poa_diffuse',
'poa_sky_diffuse', 'poa_ground_diffuse'
],
index=irrad_data.index)
assert_frame_equal(out, expected)
def test_poa_components(irrad_data, ephem_data, dni_et, relative_airmass):
aoi = irradiance.aoi(40, 180, ephem_data['apparent_zenith'],
ephem_data['azimuth'])
gr_sand = irradiance.get_ground_diffuse(40, irrad_data['ghi'],
surface_type='sand')
diff_perez = irradiance.perez(
40, 180, irrad_data['dhi'], irrad_data['dni'], dni_et,
ephem_data['apparent_zenith'], ephem_data['azimuth'], relative_airmass)
out = irradiance.poa_components(
aoi, irrad_data['dni'], diff_perez, gr_sand)
expected = pd.DataFrame(np.array(
[[ 0. , -0. , 0. , 0. ,
0. ],
[ 35.19456561, 0. , 35.19456561, 31.4635077 ,
3.73105791],
[956.18253696, 798.31939281, 157.86314414, 109.08433162,
48.77881252],
[ 90.99624896, 33.50143401, 57.49481495, 45.45978964,
12.03502531]]),
columns=['poa_global', 'poa_direct', 'poa_diffuse', 'poa_sky_diffuse',
'poa_ground_diffuse'],
index=irrad_data.index)
assert_frame_equal(out, expected)
def test_grounddiffuse_albedo_invalid_surface(irrad_data):
with pytest.raises(KeyError):
irradiance.get_ground_diffuse(40, irrad_data['ghi'], surface_type='invalid')
def test_grounddiffuse_albedo_0(irrad_data):
ground_irrad = irradiance.get_ground_diffuse(40, irrad_data['ghi'], albedo=0)
assert 0 == ground_irrad.all()
def test_grounddiffuse_simple_series(irrad_data):
ground_irrad = irradiance.get_ground_diffuse(40, irrad_data['ghi'])
assert ground_irrad.name == 'diffuse_ground'
def test_grounddiffuse_simple_float():
result = irradiance.get_ground_diffuse(40, 900)
assert_allclose(result, 26.32000014911496)
def test_grounddiffuse_albedo_surface(irrad_data):
result = irradiance.get_ground_diffuse(40,
irrad_data['ghi'],
surface_type='sand')
assert_allclose(result, [0, 3.731058, 48.778813, 12.035025], atol=1e-4)
def get_poa_ground_diffuse(surface_tilt, forecast_data, albedo):
# Calculate ground diffuse. We specified the albedo above. You could have also provided a string to the ``surface_type`` keyword argument.
poa_ground_diffuse = irradiance.get_ground_diffuse(surface_tilt, forecast_data['ghi'], albedo=albedo)
return poa_ground_diffuse
def test_grounddiffuse_albedo_0(irrad_data):
ground_irrad = irradiance.get_ground_diffuse(40,
irrad_data['ghi'],
albedo=0)
assert 0 == ground_irrad.all()
def test_grounddiffuse_simple_series(irrad_data):
ground_irrad = irradiance.get_ground_diffuse(40, irrad_data['ghi'])
assert ground_irrad.name == 'diffuse_ground'
def test_grounddiffuse_simple_float():
result = irradiance.get_ground_diffuse(40, 900)
assert_allclose(result, 26.32000014911496)
def simulate_power_by_station(station_index, surface_tilt, surface_azimuth,
pv_module, tcell_model_parameters, ghi, tamb,
wspd, albedo, days, lead_times, air_mass,
dni_extra, zenith, apparent_zenith, azimuth):
"""
This is the worker function for simulating power at a specified location. This function should be used inside
of `simulate_power` and direct usage is discouraged.
:param station_index: A station index
:param ghi: See `simulate_power`
:param tamb: See `simulate_power`
:param wspd: See `simulate_power`
:param albedo: See `simulate_power`
:param days: See `simulate_power`
:param lead_times: See `simulate_power`
:param air_mass: See `simulate_power`
:param dni_extra: See `simulate_power`
:param zenith: See `simulate_power`
:param apparent_zenith: See `simulate_power`
:param azimuth: See `simulate_power`
:param surface_tilt: See `simulate_power`
:param surface_azimuth: See `simulate_power`
:param pv_module: A PV module name
:param tcell_model_parameters: A cell module name
:return: A list with power, cell temperature, and the effective irradiance
"""
# Sanity check
assert 0 <= station_index < ghi.shape[3], 'Invalid station index'
# Determine the dimensions
num_analogs = ghi.shape[0]
num_lead_times = ghi.shape[1]
num_days = ghi.shape[2]
# Initialization
p_mp = np.zeros((num_analogs, num_lead_times, num_days))
tcell = np.zeros((num_analogs, num_lead_times, num_days))
effective_irradiance = np.zeros((num_analogs, num_lead_times, num_days))
pv_module = pvsystem.retrieve_sam("SandiaMod")[pv_module]
tcell_model_parameters = temperature.TEMPERATURE_MODEL_PARAMETERS["sapm"][
tcell_model_parameters]
for day_index in range(num_days):
for lead_time_index in range(num_lead_times):
# Determine the current time
current_posix = days[day_index] + lead_times[lead_time_index]
current_time = pd.Timestamp(current_posix, tz="UTC", unit='s')
for analog_index in range(num_analogs):
ghi_ = ghi[analog_index, lead_time_index, day_index,
station_index]
if ghi_ == 0:
continue
albedo_ = albedo[analog_index, lead_time_index, day_index,
station_index]
wspd_ = wspd[analog_index, lead_time_index, day_index,
station_index]
tamb_ = tamb[analog_index, lead_time_index, day_index,
station_index]
air_mass_ = air_mass[lead_time_index, day_index, station_index]
dni_extra_ = dni_extra[lead_time_index, day_index,
station_index]
zenith_ = zenith[lead_time_index, day_index, station_index]
apparent_zenith_ = apparent_zenith[lead_time_index, day_index,
station_index]
azimuth_ = azimuth[lead_time_index, day_index, station_index]
##########################################################################################
# #
# Core procedures of simulating power at one location #
# #
##########################################################################################
# Decompose DNI from GHI
dni_dict = irradiance.disc(ghi_, zenith_, current_time)
# Calculate POA sky diffuse
poa_sky_diffuse = irradiance.haydavies(
surface_tilt, surface_azimuth, ghi_, dni_dict["dni"],
dni_extra_, apparent_zenith_, azimuth_)
# Calculate POA ground diffuse
poa_ground_diffuse = irradiance.get_ground_diffuse(
surface_tilt, ghi_, albedo_)
# Calculate angle of incidence
aoi = irradiance.aoi(surface_tilt, surface_azimuth,
apparent_zenith_, azimuth_)
# Calculate POA total
poa_irradiance = irradiance.poa_components(
aoi, dni_dict["dni"], poa_sky_diffuse, poa_ground_diffuse)
# Calculate cell temperature
tcell[analog_index, lead_time_index,
day_index] = pvsystem.temperature.sapm_cell(
poa_irradiance['poa_global'], tamb_, wspd_,
tcell_model_parameters['a'],
tcell_model_parameters['b'],
tcell_model_parameters["deltaT"])
# Calculate effective irradiance
effective_irradiance[
analog_index, lead_time_index,
day_index] = pvsystem.sapm_effective_irradiance(
poa_irradiance['poa_direct'],
poa_irradiance['poa_diffuse'], air_mass_, aoi,
pv_module)
# Calculate power
sapm_out = pvsystem.sapm(
effective_irradiance[analog_index, lead_time_index,
day_index],
tcell[analog_index, lead_time_index, day_index], pv_module)
# Save output to numpy
p_mp[analog_index, lead_time_index,
day_index] = sapm_out["p_mp"]
return [p_mp, tcell, effective_irradiance]
def time_get_ground_diffuse(self):
irradiance.get_ground_diffuse(self.tilt, self.clearsky_irradiance.ghi)
sandia_module = sandia_modules.Canadian_Solar_CS5P_220M___2009_
# retrieve time and location parameters
time = forecast_data.index
a_point = fm.location
solpos = a_point.get_solarposition(time)
dni_extra = irradiance.get_extra_radiation(fm.time)
airmass = atmosphere.get_relative_airmass(solpos['apparent_zenith'])
poa_sky_diffuse = irradiance.haydavies(surface_tilt, surface_azimuth,
forecast_data['dhi'], forecast_data['dni'], dni_extra,
solpos['apparent_zenith'], solpos['azimuth'])
poa_ground_diffuse = irradiance.get_ground_diffuse(surface_tilt, ghi, albedo=albedo)
aoi = irradiance.aoi(surface_tilt, surface_azimuth, solpos['apparent_zenith'], solpos['azimuth'])
poa_irrad = irradiance.poa_components(aoi, forecast_data['dni'], poa_sky_diffuse,
poa_ground_diffuse)
temperature = forecast_data['temp_air']
wnd_spd = forecast_data['wind_speed']
pvtemps = pvsystem.sapm_celltemp(poa_irrad['poa_global'], wnd_spd, temperature)
effective_irradiance = pvsystem.sapm_effective_irradiance(poa_irrad.poa_direct,
poa_irrad.poa_diffuse, airmass, aoi, sandia_module)
sapm_out = pvsystem.sapm(effective_irradiance, pvtemps['temp_cell'], sandia_module)
# print(sapm_out.head())
print(sapm_out['p_mp'])
plot = "pop"
def test_grounddiffuse_albedo_surface(irrad_data):
result = irradiance.get_ground_diffuse(40, irrad_data['ghi'],
surface_type='sand')
assert_allclose(result, [0, 3.731058, 48.778813, 12.035025], atol=1e-4)
def test_grounddiffuse_albedo_invalid_surface(irrad_data):
with pytest.raises(KeyError):
irradiance.get_ground_diffuse(40,
irrad_data['ghi'],
surface_type='invalid')
def __init__(self, panel=None, forecast_length=7, forecast_model=None):
self.forecast_length = forecast_length
if panel == None:
self.panel = Panel()
else:
self.panel = panel
if forecast_model == None:
self.fm = GFS()
else:
self.fm = forecast_model
self.start = pd.Timestamp(datetime.date.today(),
tz=self.panel.tz) # today's date
self.end = self.start + pd.Timedelta(
days=forecast_length) # days from today
print(
"getting processed data with lat: %s, lng: %s, start:%s, end:%s" %
(self.panel.latitude, self.panel.longitude, self.start, self.end))
# get forecast data
forecast_data = self.fm.get_processed_data(self.panel.latitude,
self.panel.longitude,
self.start, self.end)
ghi = forecast_data['ghi']
# get solar position
time = forecast_data.index
a_point = self.fm.location
solpos = a_point.get_solarposition(time)
# get PV(photovoltaic device) modules
sandia_modules = pvsystem.retrieve_sam('SandiaMod')
sandia_module = sandia_modules.Canadian_Solar_CS5P_220M___2009_
dni_extra = irradiance.get_extra_radiation(
self.fm.time) # extra terrestrial radiation
airmass = atmosphere.get_relative_airmass(solpos['apparent_zenith'])
# POA: Plane Of Array: an image sensing device consisting of an array
# (typically rectangular) of light-sensing pixels at the focal plane of a lens.
# https://en.wikipedia.org/wiki/Staring_array
# Diffuse sky radiation is solar radiation reaching the Earth's surface after
# having been scattered from the direct solar beam by molecules or particulates
# in the atmosphere.
# https://en.wikipedia.org/wiki/Diffuse_sky_radiation
poa_sky_diffuse = irradiance.haydavies(self.panel.surface_tilt,
self.panel.surface_azimuth,
forecast_data['dhi'],
forecast_data['dni'], dni_extra,
solpos['apparent_zenith'],
solpos['azimuth'])
# Diffuse reflection is the reflection of light or other waves or particles
# from a surface such that a ray incident on the surface is scattered at many
# angles rather than at just one angle as in the case of specular reflection.
poa_ground_diffuse = irradiance.get_ground_diffuse(
self.panel.surface_tilt, ghi, albedo=self.panel.albedo)
# AOI: Angle Of Incidence
aoi = irradiance.aoi(self.panel.surface_tilt,
self.panel.surface_azimuth,
solpos['apparent_zenith'], solpos['azimuth'])
# irradiance is the radiant flux (power) received by a surface per unit area
# https://en.wikipedia.org/wiki/Irradiance
poa_irrad = irradiance.poa_components(aoi, forecast_data['dni'],
poa_sky_diffuse,
poa_ground_diffuse)
temperature = forecast_data['temp_air']
wnd_spd = forecast_data['wind_speed']
# pvtemps: pv temperature
pvtemps = pvsystem.sapm_celltemp(poa_irrad['poa_global'], wnd_spd,
temperature)
# irradiance actually used by PV
effective_irradiance = pvsystem.sapm_effective_irradiance(
poa_irrad.poa_direct, poa_irrad.poa_diffuse, airmass, aoi,
sandia_module)
# SAPM: Sandia PV Array Performance Model
# https://pvpmc.sandia.gov/modeling-steps/2-dc-module-iv/point-value-models/sandia-pv-array-performance-model/
self.sapm_out = pvsystem.sapm(effective_irradiance,
pvtemps['temp_cell'], sandia_module)
sapm_inverters = pvsystem.retrieve_sam('sandiainverter')
sapm_inverter = sapm_inverters[
'ABB__MICRO_0_25_I_OUTD_US_208_208V__CEC_2014_']
self.ac_power = pvsystem.snlinverter(self.sapm_out.v_mp,
self.sapm_out.p_mp, sapm_inverter)
