def calculate_power(solar_data, pv_dict):
"""Use PVWatts to translate weather data into power.
:param dict solar_data: weather data as returned by :meth:`Psm3Data.to_dict`.
:param dict pv_dict: solar plant attributes.
:return: (*numpy.array*) hourly power output.
"""
pv_dat = pssc.dict_to_ssc_table(pv_dict, "pvwattsv7")
pv = PVWatts.wrap(pv_dat)
pv.SolarResource.assign({"solar_resource_data": solar_data})
pv.execute()
return np.array(pv.Outputs.gen)
def get_solar_energy_output(self):
ssc = pssc.PySSC()
f = open(self.sam_export_json)
self.dic = json.load(f)
self.dic['solar_resource_file'] = self.fp_srw
### uncomment if you want to change any model input parameters
# self.dic['system_capacity'] = 20000
# self.dic['module_type'] = 0
# self.dic['dc_ac_ratio'] = 1.3
# self.dic['array_type'] = 2
# self.dic['tilt'] = 35
# self.dic['azimuth'] = 180
# self.dic['gcr'] = 0.40
# self.dic['losses'] = 14
# self.dic['en_snowloss'] = 0
# self.dic['inv_eff'] = 95
pv_dat = pssc.dict_to_ssc_table(self.dic, "pvwattsv7")
grid_dat = pssc.dict_to_ssc_table(self.dic, "grid")
f.close()
pv = PVWatts.wrap(pv_dat)
grid = Grid.from_existing(pv)
grid.assign(Grid.wrap(grid_dat).export())
pv.execute()
grid.execute()
self.json_dict = pv.Outputs.export()
# print(self.json_dict.keys())
self.df_output = pd.DataFrame()
self.df_output[self.year] = self.json_dict['gen']
for col in self.df_output.columns:
self.df_output[col] = preprocessing.minmax_scale(
self.df_output[col].values.reshape(1, -1),
feature_range=(0, 1),
axis=1,
copy=True).T
if self.df_all is None:
self.df_all = self.df_output.copy()
else:
self.df_all = pd.concat([self.df_all, self.df_output], axis=1)
def retrieve_data(solar_plant, email, api_key, year="2016", rate_limit=0.5):
"""Retrieves irradiance data from NSRDB and calculate the power output using
the System Adviser Model (SAM).
:param pandas.DataFrame solar_plant: plant data frame.
:param str email: email used to`sign up <https://developer.nrel.gov/signup/>`_.
:param str api_key: API key.
:param str year: year.
:param int/float rate_limit: minimum seconds to wait between requests to NREL
:return: (*pandas.DataFrame*) -- data frame with *'Pout'*, *'plant_id'*,
*'ts'* and *'ts_id'* as columns. Values are power output for a 1MW generator.
"""
# SAM only takes 365 days.
try:
leap_day = (pd.Timestamp("%s-02-29-00" % year).dayofyear - 1) * 24
is_leap_year = True
dates = pd.date_range(start="%s-01-01-00" % 2015,
freq="H",
periods=365 * 24)
dates = dates.map(lambda t: t.replace(year=int(year)))
except ValueError:
leap_day = None
is_leap_year = False
dates = pd.date_range(start="%s-01-01-00" % year,
freq="H",
periods=365 * 24)
# Identify unique location
coord = get_plant_id_unique_location(solar_plant)
data = pd.DataFrame({"Pout": [], "plant_id": [], "ts": [], "ts_id": []})
# PV tracking ratios
# By state and by interconnect when EIA data do not have any solar PV in
# the state
pv_info = get_pv_tracking_data()
zone_id = solar_plant.zone_id.unique()
frac = {}
for i in zone_id:
state = id2abv[i]
frac[i] = get_pv_tracking_ratio_state(pv_info, [state])
if frac[i] is None:
frac[i] = get_pv_tracking_ratio_state(
pv_info, list(interconnect2abv[abv2interconnect[state]]))
# Inverter Loading Ratio
ilr = 1.25
api = NrelApi(email, api_key, rate_limit)
for key in tqdm(coord.keys(), total=len(coord)):
lat, lon = key[1], key[0]
solar_data = api.get_psm3_at(
lat,
lon,
attributes="dhi,dni,wind_speed,air_temperature",
year=year,
leap_day=False,
dates=dates,
).to_dict()
for i in coord[key]:
data_site = pd.DataFrame({
"ts":
pd.date_range(start="%s-01-01-00" % year,
end="%s-12-31-23" % year,
freq="H")
})
data_site["ts_id"] = range(1, len(data_site) + 1)
data_site["plant_id"] = i
power = 0
for j, axis in enumerate([0, 2, 4]):
pv_dict = {
"system_capacity": ilr,
"dc_ac_ratio": ilr,
"tilt": 30,
"azimuth": 180,
"inv_eff": 94,
"losses": 14,
"array_type": axis,
"gcr": 0.4,
"adjust:constant": 0,
}
pv_dat = pssc.dict_to_ssc_table(pv_dict, "pvwattsv7")
pv = PVWatts.wrap(pv_dat)
pv.SolarResource.assign({"solar_resource_data": solar_data})
pv.execute()
ratio = frac[solar_plant.loc[i].zone_id][j]
power += ratio * np.array(pv.Outputs.gen)
if is_leap_year is True:
data_site["Pout"] = np.insert(power, leap_day,
power[leap_day - 24:leap_day])
else:
data_site["Pout"] = power
data = data.append(data_site, ignore_index=True, sort=False)
data["plant_id"] = data["plant_id"].astype(np.int32)
data["ts_id"] = data["ts_id"].astype(np.int32)
data.sort_values(by=["ts_id", "plant_id"], inplace=True)
data.reset_index(inplace=True, drop=True)
return data
# PVWatts simulation.
# The json file is generated from SAM using the "Generate Code" menu item
# in the added simulation case. Choose "JSON for inputs" and a .json file
# with the title of your simulation case will be created where you select with
# the "Open" button on the file dialog.
json_file_path = 'Examples/100kW_PVWatts.json' # Change this file name to yours!
with open(json_file_path) as f:
dic = json.load(f)
# The next seven lines are needed to load the PySAM data structures with the
# inputs from the json file.
pv_dat = pssc.dict_to_ssc_table(dic, "pvwattsv7")
grid_dat = pssc.dict_to_ssc_table(dic, "grid")
ur_dat = pssc.dict_to_ssc_table(dic, "utilityrate5")
cl_dat = pssc.dict_to_ssc_table(dic, "cashloan")
pv = PVWatts.wrap(pv_dat)
grid = Grid.from_existing(pv)
ur = UtilityRate.from_existing(pv)
cl = Cashloan.from_existing(pv)
grid.assign(Grid.wrap(grid_dat).export())
ur.assign(UtilityRate.wrap(ur_dat).export())
cl.assign(Cashloan.wrap(cl_dat).export())
# The models are executed in order. Note that the outputs from the first
# simulation are automatically available for the next one, and so on. :-)
pv.execute()
grid.execute()
ur.execute()
cl.execute()
if verbose: # Print out some results. The variable names can be found in
('Json file', '*.json'),
('All files', '*.*'),
])
if verbose:
print(json_file_path)
except NameError:
print('NameError: with the json file')
else:
with open(json_file_path) as f:
dic = json.load(f)
pv_dat = pssc.dict_to_ssc_table(dic, "pvwattsv7")
grid_dat = pssc.dict_to_ssc_table(dic, "grid")
ur_dat = pssc.dict_to_ssc_table(dic, "utilityrate5")
cl_dat = pssc.dict_to_ssc_table(dic, "cashloan")
pv = PVWattsCommercial.wrap(pv_dat)
grid = Grid.from_existing(pv)
ur = UtilityRate.from_existing(pv, 'PVWattsCommercial')
cl = Cashloan.from_existing(pv, 'PVWattsCommercial')
grid.assign(Grid.wrap(grid_dat).export())
ur.assign(UtilityRate.wrap(ur_dat).export())
cl.assign(Cashloan.wrap(cl_dat).export())
degradation = cl.SystemOutput.degradation[0]
if verbose:
print('degradation', degradation)
if testing:
pv.execute()
grid.execute()
ur.execute()
cl.execute()