def setUp(self):
self.short_circuit_current = 3.87 # [A]
self.open_circuit_voltage = 42.1 # [V]
self.temperature_voltage_coefficient = -0.080 # [V/ºC]
self.temperature_current_coefficient = (
0.065 / 100
) * self.short_circuit_current # ([%/ºC] / [100%]) * [A] = [A/ºC]
series_resistance = 0.56
shunt_resistance = 1862
diode_quality_factor = 1.343
number_of_cells_in_series = 72
number_of_voltage_decimal_digits = 1
self.single_diode_model = SingleDiodeModel(
self.short_circuit_current,
self.open_circuit_voltage,
number_of_cells_in_series,
number_of_voltage_decimal_digits=number_of_voltage_decimal_digits,
temperature_voltage_coefficient=self.
temperature_voltage_coefficient,
temperature_current_coefficient=self.
temperature_current_coefficient,
series_resistance=series_resistance,
shunt_resistance=shunt_resistance,
diode_quality_factor=diode_quality_factor)
def __get_single_diode_model_and_calculate(
self, operating_temperature, actual_irradiance,
partial_shading_ratio, number_of_corresponding_modules):
overall_number_of_cells_in_series = self.number_of_cells_in_series * number_of_corresponding_modules
overall_open_circuit_voltage = self.open_circuit_voltage * number_of_corresponding_modules
single_diode_model = SingleDiodeModel(
self.short_circuit_current,
overall_open_circuit_voltage,
overall_number_of_cells_in_series,
number_of_voltage_decimal_digits=self.
number_of_voltage_decimal_digits,
temperature_voltage_coefficient=self.
temperature_voltage_coefficient,
temperature_current_coefficient=self.
temperature_current_coefficient,
series_resistance=self.series_resistance,
shunt_resistance=self.shunt_resistance,
diode_quality_factor=self.diode_quality_factor)
actual_irradiance_for_the_group_of_modules = actual_irradiance * partial_shading_ratio
single_diode_model.calculate(
operating_temperature, actual_irradiance_for_the_group_of_modules)
return single_diode_model
class TestSingleDiodeModel(unittest.TestCase):
def setUp(self):
self.short_circuit_current = 3.87 # [A]
self.open_circuit_voltage = 42.1 # [V]
self.temperature_voltage_coefficient = -0.080 # [V/ºC]
self.temperature_current_coefficient = (
0.065 / 100
) * self.short_circuit_current # ([%/ºC] / [100%]) * [A] = [A/ºC]
series_resistance = 0.56
shunt_resistance = 1862
diode_quality_factor = 1.343
number_of_cells_in_series = 72
number_of_voltage_decimal_digits = 1
self.single_diode_model = SingleDiodeModel(
self.short_circuit_current,
self.open_circuit_voltage,
number_of_cells_in_series,
number_of_voltage_decimal_digits=number_of_voltage_decimal_digits,
temperature_voltage_coefficient=self.
temperature_voltage_coefficient,
temperature_current_coefficient=self.
temperature_current_coefficient,
series_resistance=series_resistance,
shunt_resistance=shunt_resistance,
diode_quality_factor=diode_quality_factor)
def test_calculate_i_v_values(self):
# maximum_power_point_current = 3.56 # [A]
# maximum_power_point_voltage = 33.7 # [V]
operating_temperature = 35 + 273
actual_irradiance = 900
self.single_diode_model.calculate(operating_temperature,
actual_irradiance)
# self.single_diode_model.calculate(operating_temperature, actual_irradiance, maximum_power_point_current, maximum_power_point_voltage)
voltages = self.single_diode_model.voltages
currents = self.single_diode_model.currents
powers = self.single_diode_model.powers
self.assertEqual(len(voltages), 411)
self.assertEqual(voltages[0], 0)
self.assertEqual(voltages[410], 41.0)
self.assertAlmostEqual(currents[0], 3.506, delta=0.001)
self.assertEqual(currents[410], 0)
self.assertEqual(powers[0], 0)
self.assertEqual(powers[410], 0)
class TestSingleDiodeModel(unittest.TestCase):
def setUp(self):
self.short_circuit_current = 3.87 # [A]
self.open_circuit_voltage = 42.1 # [V]
self.temperature_voltage_coefficient = -0.080 # [V/ºC]
self.temperature_current_coefficient = (0.065 / 100) * self.short_circuit_current # ([%/ºC] / [100%]) * [A] = [A/ºC]
series_resistance = 0.56
shunt_resistance = 1862
diode_quality_factor = 1.343
number_of_cells_in_series = 72
number_of_voltage_decimal_digits = 1
self.single_diode_model = SingleDiodeModel(self.short_circuit_current,
self.open_circuit_voltage,
number_of_cells_in_series,
number_of_voltage_decimal_digits = number_of_voltage_decimal_digits,
temperature_voltage_coefficient = self.temperature_voltage_coefficient,
temperature_current_coefficient = self.temperature_current_coefficient,
series_resistance = series_resistance,
shunt_resistance = shunt_resistance,
diode_quality_factor = diode_quality_factor)
def test_calculate_i_v_values(self):
# maximum_power_point_current = 3.56 # [A]
# maximum_power_point_voltage = 33.7 # [V]
operating_temperature = 35 + 273
actual_irradiance = 900
self.single_diode_model.calculate(operating_temperature, actual_irradiance)
# self.single_diode_model.calculate(operating_temperature, actual_irradiance, maximum_power_point_current, maximum_power_point_voltage)
voltages = self.single_diode_model.voltages
currents = self.single_diode_model.currents
powers = self.single_diode_model.powers
self.assertEqual(len(voltages), 411)
self.assertEqual(voltages[0], 0)
self.assertEqual(voltages[410], 41.0)
self.assertAlmostEqual(currents[0], 3.506, delta = 0.001)
self.assertEqual(currents[410], 0)
self.assertEqual(powers[0], 0)
self.assertEqual(powers[410], 0)
def __get_single_diode_model_and_calculate(self, operating_temperature, actual_irradiance, partial_shading_ratio, number_of_corresponding_modules):
overall_number_of_cells_in_series = self.number_of_cells_in_series * number_of_corresponding_modules
overall_open_circuit_voltage = self.open_circuit_voltage * number_of_corresponding_modules
single_diode_model = SingleDiodeModel(self.short_circuit_current,
overall_open_circuit_voltage,
overall_number_of_cells_in_series,
number_of_voltage_decimal_digits = self.number_of_voltage_decimal_digits,
temperature_voltage_coefficient = self.temperature_voltage_coefficient,
temperature_current_coefficient = self.temperature_current_coefficient,
series_resistance = self.series_resistance,
shunt_resistance = self.shunt_resistance,
diode_quality_factor = self.diode_quality_factor)
actual_irradiance_for_the_group_of_modules = actual_irradiance * partial_shading_ratio
single_diode_model.calculate(operating_temperature, actual_irradiance_for_the_group_of_modules)
return single_diode_model
def setUp(self):
self.short_circuit_current = 3.87 # [A]
self.open_circuit_voltage = 42.1 # [V]
self.temperature_voltage_coefficient = -0.080 # [V/ºC]
self.temperature_current_coefficient = (0.065 / 100) * self.short_circuit_current # ([%/ºC] / [100%]) * [A] = [A/ºC]
series_resistance = 0.56
shunt_resistance = 1862
diode_quality_factor = 1.343
number_of_cells_in_series = 72
number_of_voltage_decimal_digits = 1
self.single_diode_model = SingleDiodeModel(self.short_circuit_current,
self.open_circuit_voltage,
number_of_cells_in_series,
number_of_voltage_decimal_digits = number_of_voltage_decimal_digits,
temperature_voltage_coefficient = self.temperature_voltage_coefficient,
temperature_current_coefficient = self.temperature_current_coefficient,
series_resistance = series_resistance,
shunt_resistance = shunt_resistance,
diode_quality_factor = diode_quality_factor)
short_circuit_current = 5.75
open_circuit_voltage = 22.5
temperature_current_coefficient = 0.04
series_resistance = 0.115820201147
shunt_resistance = 37173.5612907
diode_quality_factor = 1.27873896365
number_of_series_connected_cells = 36
number_of_voltage_decimal_digits = 1
single_diode_model = SingleDiodeModel(
short_circuit_current,
open_circuit_voltage,
number_of_series_connected_cells,
number_of_voltage_decimal_digits=number_of_voltage_decimal_digits,
temperature_current_coefficient=temperature_current_coefficient,
series_resistance=series_resistance,
shunt_resistance=shunt_resistance,
diode_quality_factor=diode_quality_factor)
# operating_temperature = 25 + 273
operating_temperature = 35 + 273
actual_irradiance = 1000
single_diode_model.calculate(operating_temperature, actual_irradiance)
# voltages = single_diode_model.voltages
# currents = single_diode_model.currents
# powers = single_diode_model.powers
# Values for RNG-100D:
short_circuit_current = 5.75
open_circuit_voltage = 22.5
temperature_current_coefficient = 0.04
series_resistance = 0.115820201147
shunt_resistance = 37173.5612907
diode_quality_factor = 1.27873896365
number_of_series_connected_cells = 36
number_of_voltage_decimal_digits = 1
single_diode_model = SingleDiodeModel(short_circuit_current,
open_circuit_voltage,
number_of_series_connected_cells,
number_of_voltage_decimal_digits = number_of_voltage_decimal_digits,
temperature_current_coefficient = temperature_current_coefficient,
series_resistance = series_resistance,
shunt_resistance = shunt_resistance,
diode_quality_factor = diode_quality_factor)
# operating_temperature = 25 + 273
operating_temperature = 35 + 273
actual_irradiance = 1000
single_diode_model.calculate(operating_temperature,
actual_irradiance)
# voltages = single_diode_model.voltages
# currents = single_diode_model.currents
# powers = single_diode_model.powers