def test_calc_series():
pvconst = PVconstants()
pvcells = [
PVcell(pvconst=pvconst, Tcell=323),
PVcell(pvconst=pvconst, Ee=0.75, Tcell=313),
PVcell(pvconst=pvconst, Ee=0.55, Tcell=303)
]
i_at_vrbd = np.asarray([
np.interp(pvc.VRBD, pvc.Vcell.flat, pvc.Icell.flat) for pvc in pvcells
])
icells = np.asarray([pvc.Icell.flatten() for pvc in pvcells])
vcells = np.asarray([pvc.Vcell.flatten() for pvc in pvcells])
isc = np.asarray([pvc.Isc for pvc in pvcells])
i, v = pvconst.calcSeries(icells, vcells, isc.mean(), i_at_vrbd.max())
iv_old = np.loadtxt(os.path.join(BASE_DIR, 'calc_series_test_iv_old.dat'))
iv_expected = np.loadtxt(os.path.join(BASE_DIR, 'calc_series_test_iv.dat'))
# noinspection PyTypeChecker
iv_calc = np.concatenate([[i], [v]], axis=0).T
# noinspection PyTypeChecker
ok_(np.allclose(iv_calc, iv_expected))
assert np.allclose(iv_old[0, :], np.interp(iv_old[1, :], v, i), 0.01, 0.01)
assert np.allclose(iv_old[1, :],
np.interp(iv_old[0, :], np.flipud(i), np.flipud(v)),
0.1, 0.1)
return i, v
def __init__(self, numberMods=NUMBERMODS, pvmods=None,
pvconst=None):
# is pvmods a list?
try:
pvmod0 = pvmods[0]
except TypeError:
# is pvmods an object?
try:
pvconst = pvmods.pvconst
except AttributeError:
# try to use the pvconst arg or create one if none
if not pvconst:
pvconst = PVconstants()
# create pvmod
pvmods = PVmodule(pvconst=pvconst)
# expand pvmods to list
pvmods = [pvmods] * numberMods
else:
pvconst = pvmod0.pvconst
numberMods = len(pvmods)
for p in pvmods:
if p.pvconst is not pvconst:
raise Exception('pvconst must be the same for all modules')
self.pvconst = pvconst #: ``PVconstants`` used in ``PVstring``
self.numberMods = numberMods #: number of module in string
self.pvmods = pvmods #: list of ``PVModule`` in ``PVstring``
# calculate string
self.Istring, self.Vstring, self.Pstring = self.calcString()
def __init__(self,
Rs=RS,
Rsh=RSH,
Isat1_T0=ISAT1_T0,
Isat2=ISAT2,
Isc0_T0=ISC0_T0,
aRBD=ARBD,
bRBD=BRBD,
VRBD=VRBD_,
nRBD=NRBD,
Eg=EG,
alpha_Isc=ALPHA_ISC,
Tcell=TCELL,
Ee=1.,
pvconst=PVconstants()):
# user inputs
self.Rs = Rs #: [ohm] series resistance
self.Rsh = Rsh #: [ohm] shunt resistance
self.Isat1_T0 = Isat1_T0 #: [A] diode one sat. current at T0
self.Isat2 = Isat2 #: [A] diode two saturation current
self.Isc0_T0 = Isc0_T0 #: [A] short circuit current at T0
self.aRBD = aRBD #: reverse breakdown coefficient 1
self.bRBD = bRBD #: reverse breakdown coefficient 2
self.VRBD = VRBD #: [V] reverse breakdown voltage
self.nRBD = nRBD #: reverse breakdown exponent
self.Eg = Eg #: [eV] band gap of cSi
self.alpha_Isc = alpha_Isc #: [1/K] short circuit temp. coeff.
self.Tcell = Tcell #: [K] cell temperature
self.Ee = Ee #: [suns] incident effective irradiance on cell
self.pvconst = pvconst #: configuration constants
self.Icell = None #: cell currents on IV curve [A]
self.Vcell = None #: cell voltages on IV curve [V]
self.Pcell = None #: cell power on IV curve [W]
def __init__(self,
cell_pos=STD96,
pvcells=None,
pvconst=PVconstants(),
Vbypass=VBYPASS,
cellArea=CELLAREA):
# TODO: check cell position pattern
self.cell_pos = cell_pos #: cell position pattern dictionary
self.numberCells = sum([len(c) for s in self.cell_pos for c in s])
"""number of cells in the module"""
self.pvconst = pvconst #: configuration constants
self.Vbypass = Vbypass #: [V] trigger voltage of bypass diode
self.cellArea = cellArea #: [cm^2] cell area
if pvcells is None:
# faster to use copy instead of making each object in a for-loop
# use copy instead of deepcopy to keep same pvconst for all objects
# PVcell.calcCell() creates new np.ndarray if attributes change
pvcells = PVcell(pvconst=self.pvconst)
if isinstance(pvcells, PVcell):
pvcells = [pvcells] * self.numberCells
if len(pvcells) != self.numberCells:
# TODO: use pvexception
raise Exception(
"Number of cells doesn't match cell position pattern.")
self.pvcells = pvcells #: list of `PVcell` objects in this `PVmodule`
self.numSubStr = len(self.cell_pos) #: number of substrings
self.subStrCells = [len(_) for _ in self.cell_pos] #: cells per substr
# initialize members so PyLint doesn't get upset
self.Imod, self.Vmod, self.Pmod, self.Isubstr, self.Vsubstr = self.calcMod(
)
def __init__(self, pvconst=None, numberStrs=NUMBERSTRS,
pvstrs=None, numberMods=NUMBERMODS, pvmods=None):
# is pvstrs a list?
try:
pvstr0 = pvstrs[0]
except TypeError:
# is pvstrs a PVstring object?
try:
pvconst = pvstrs.pvconst
except AttributeError:
# try to use the pvconst arg or create one if none
if not pvconst:
pvconst = PVconstants()
# create a pvstring
pvstrs = PVstring(numberMods=numberMods, pvmods=pvmods,
pvconst=pvconst)
# expand pvstrs to list
pvstrs = [pvstrs] * numberStrs
numberMods = [numberMods] * numberStrs
else:
pvconst = pvstr0.pvconst
numberStrs = len(pvstrs)
numberMods = []
for p in pvstrs:
if p.pvconst is not pvconst:
raise Exception('pvconst must be the same for all strings')
numberMods.append(len(p.pvmods))
self.pvconst = pvconst #: ``PVconstants`` used in ``PVsystem``
self.numberStrs = numberStrs #: number strings in the system
self.numberMods = numberMods #: list of number of modules per string
self.pvstrs = pvstrs #: list of ``PVstring`` in system
# calculate pvsystem
self.update()
def __init__(self,
cell_pos=STD96,
pvcells=None,
pvconst=None,
Vbypass=None,
cellArea=CELLAREA):
# TODO: check cell position pattern
self.cell_pos = cell_pos #: cell position pattern dictionary
self.numberCells = sum([len(c) for s in self.cell_pos for c in s])
"""number of cells in the module"""
# is pvcells a list?
try:
pvc0 = pvcells[0]
except TypeError:
# is pvcells an object?
try:
pvconst = pvcells.pvconst
except AttributeError:
# try to use the pvconst arg or create one if none
if not pvconst:
pvconst = PVconstants()
# create pvcell
pvcells = PVcell(pvconst=pvconst)
# expand pvcells to list
pvcells = [pvcells] * self.numberCells
else:
pvconst = pvc0.pvconst
for p in pvcells:
if p.pvconst is not pvconst:
raise Exception(
'PVconstant must be the same for all cells')
self.pvconst = pvconst #: configuration constants
# set default value of Vbypass if None
if Vbypass is None:
self.Vbypass = VBYPASS #: [V] trigger voltage of bypass diode
else:
# if an object is passed, use that to determine the config of bypass diodes
self.Vbypass = Vbypass
self.Vbypass_config = parse_diode_config(self.Vbypass, self.cell_pos)
self.cellArea = cellArea #: [cm^2] cell area
# check cell position pattern matches list of cells
if len(pvcells) != self.numberCells:
raise PVexception(
"Number of cells doesn't match cell position pattern.")
self.pvcells = pvcells #: list of `PVcell` objects in this `PVmodule`
self.numSubStr = len(self.cell_pos) #: number of substrings
self.subStrCells = [len(_) for _ in self.cell_pos] #: cells per substr
# initialize members so PyLint doesn't get upset
self.Imod, self.Vmod, self.Pmod, self.Isubstr, self.Vsubstr = self.calcMod(
)
def __init__(self, pvconst=PVconstants(), numberStrs=NUMBERSTRS,
pvstrs=None, numberMods=NUMBERMODS, pvmods=None):
self.pvconst = pvconst
self.numberStrs = numberStrs
self.numberMods = numberMods
if pvstrs is None:
pvstrs = PVstring(numberMods=self.numberMods, pvmods=pvmods,
pvconst=self.pvconst)
# use deep copy instead of making each object in a for-loop
if isinstance(pvstrs, PVstring):
pvstrs = [pvstrs] * self.numberStrs
if len(pvstrs) != self.numberStrs:
# TODO: use pvmismatch excecptions
raise Exception("Number of strings don't match.")
self.pvstrs = pvstrs
self.Isys, self.Vsys, self.Psys = self.calcSystem()
(self.Imp, self.Vmp, self.Pmp,
self.Isc, self.Voc, self.FF, self.eff) = self.calcMPP_IscVocFFeff()
def __init__(self, numberMods=NUMBERMODS, pvmods=None,
pvconst=PVconstants()):
self.pvconst = pvconst
self.numberMods = numberMods
if pvmods is None:
# use deepcopy instead of making each object in for-loop, 2x faster
pvmods = PVmodule(pvconst=self.pvconst)
if isinstance(pvmods, PVmodule):
pvmods = [pvmods] * self.numberMods
# reset pvconsts in all pvcells and pvmodules
for p in pvmods:
for c in p.pvcells:
c.pvconst = self.pvconst
p.pvconst = self.pvconst
if len(pvmods) != self.numberMods:
# TODO: use pvmismatch exceptions
raise Exception("Number of modules doesn't match.")
self.pvmods = pvmods
self.Istring, self.Vstring, self.Pstring = self.calcString()
def test_calc_series():
pvconst = PVconstants()
pvcells = [
PVcell(pvconst=pvconst, Tcell=323),
PVcell(pvconst=pvconst, Ee=0.75, Tcell=313),
PVcell(pvconst=pvconst, Ee=0.55, Tcell=303)
]
i_at_vrbd = np.asarray([
np.interp(pvc.VRBD, pvc.Vcell.flat, pvc.Icell.flat) for pvc in pvcells
])
icells = np.asarray([pvc.Icell.flatten() for pvc in pvcells])
vcells = np.asarray([pvc.Vcell.flatten() for pvc in pvcells])
isc = np.asarray([pvc.Isc for pvc in pvcells])
i, v = pvconst.calcSeries(icells, vcells, isc.mean(), i_at_vrbd.max())
iv = np.loadtxt(os.path.join(BASE_DIR, 'calc_series_test_iv.dat'))
# noinspection PyTypeChecker
ok_(np.allclose(i, iv[0]))
# noinspection PyTypeChecker
ok_(np.allclose(v, iv[1], rtol=1e-4))
return i, v