class PlantFromWWF(Component):
"""Create a Plant information from a .wwf WAsP file"""
# Inputs
filename = Str(iotype='in', desc='The .wwf file name')
wt_desc = VarTree(GenericWindTurbinePowerCurveVT(),
iotype='in',
desc='The wind turbine power curve')
# Outputs
wt_layout = VarTree(GenericWindFarmTurbineLayout(),
iotype='out',
desc='wind turbine properties and layout')
wind_rose_array = Array(
iotype='out',
units='m/s',
desc='Windrose array [wind_directions, frequency, weibull_A, weibull_k]'
)
def execute(self):
# Reading the .wwf file
wwf = WWF(self.filename)
self.wt_layout.wt_list.append(self.wt_desc)
# self.wt_layout.wt_wind_roses.frequency_array =
self.wt_layout.configure_single()
for wt, wr in self.wwf.windroses.iteritems():
self.wt_layout.wt_positions[i, :] = self.wwf.data[wt][:2]
self.wt_layout.wt_wind_roses.append(wr)
i += 1
self.wt_layout.configure_single()
# For practical reason we also output the first wind rose array outside
# the wt_layout
self.wind_rose_array = self.wt_layout.wt_wind_roses[0]
class WTDescFromWTG(Component):
"""Create a wt_desc from a .wtg WAsP file"""
# Inputs
filename = Str(iotype='in', desc='The .wtg file name')
# Outputs
wt_desc = VarTree(GenericWindTurbinePowerCurveVT(),
iotype='out',
desc='The wind turbine power curve')
def __init__(self, filename=None):
super(WTDescFromWTG, self).__init__()
if filename is not None:
self.filename = filename
self.execute()
def execute(self):
# Reading the .wtg file
wtg = WTG(self.filename)
# Filling up the VT
self.wt_desc.power_curve = wtg.data[:, :2]
self.wt_desc.c_t_curve = vstack([wtg.data[:, 0], wtg.data[:, 2]]).T
self.wt_desc.cut_in_wind_speed = wtg.data[0, 0]
self.wt_desc.cut_out_wind_speed = wtg.data[-1, 0]
self.wt_desc.air_density = wtg.density
self.wt_desc.rotor_diameter = wtg.rotor_diameter
self.wt_desc.power_rating = self.wt_desc.power_curve[:, 1].max()
self.wt_desc.hub_height = wtg.hub_height
self.wt_desc.test_consistency()
def __init__(self, openwind_executable, workbook_path,
turbine_name=None, script_file=None, machine_rating=None,
academic=False, debug=False):
""" Creates a new LCOE Assembly object """
foundErrors = False
if not os.path.isfile(openwind_executable):
sys.stderr.write('\n*** ERROR: executable {:} not found\n\n'.format(openwind_executable))
foundErrors = True
if not os.path.isfile(workbook_path):
sys.stderr.write('\n*** ERROR: workbook {:} not found\n\n'.format(workbook_path))
foundErrors = True
if foundErrors:
return None
# Set the location where new scripts and turbine files will be written
self.workDir = os.getcwd()
#self.workDir = os.path.dirname(os.path.realpath(__file__)) # location of this source file
self.openwind_executable = openwind_executable
self.workbook_path = workbook_path
self.turbine_name = turbine_name
self.script_file = script_file
self.academic = academic
self.debug = debug
if machine_rating is not None:
self.machine_rating = machine_rating
super(openwind_assembly, self).__init__()
# TODO: hack for now assigning turbine
self.turb = GenericWindTurbinePowerCurveVT()
self.turb.power_rating = self.machine_rating
self.turb.hub_height = self.hub_height
self.turb.power_curve = np.copy(self.power_curve)
for i in xrange(0,self.turbine_number):
self.wt_layout.wt_list.append(self.turb)
def generate_GenericWindTurbinePowerCurveVT(WT):
"""Generate a GenericWindTurbinePowerCurveVT instance from a WindTurbine
instance
Parameters
----------
WT: WindTurbine
A WindTurbine instance
Returns
-------
wt_desc: GenericWindTurbinePowerCurveVT
A GenericWindTurbinePowerCurveVT instance containing the same information
as in WT
"""
wt_desc = GenericWindTurbinePowerCurveVT()
wt_desc.hub_height = WT.H
wt_desc.rotor_diameter = WT.R * 2.0
wt_desc.c_t_curve = np.vstack([WT.ref_u, WT.ref_CT]).T
wt_desc.power_curve = np.vstack([WT.ref_u, WT.ref_P]).T
wt_desc.cut_in_wind_speed = WT.u_cutin
wt_desc.cut_out_wind_speed = WT.u_cutout
return wt_desc
def generate_GenericWindTurbinePowerCurveVT(WT):
"""Generate a GenericWindTurbinePowerCurveVT instance from a WindTurbine
instance
Parameters
----------
WT: WindTurbine
A WindTurbine instance
Returns
-------
wt_desc: GenericWindTurbinePowerCurveVT
A GenericWindTurbinePowerCurveVT instance containing the same information
as in WT
"""
wt_desc = GenericWindTurbinePowerCurveVT()
wt_desc.hub_height = WT.H
wt_desc.rotor_diameter = WT.R*2.0
wt_desc.c_t_curve = np.vstack([WT.ref_u, WT.ref_CT]).T
wt_desc.power_curve = np.vstack([WT.ref_u, WT.ref_P]).T
wt_desc.cut_in_wind_speed = WT.u_cutin
wt_desc.cut_out_wind_speed = WT.u_cutout
return wt_desc
def generate_random_GenericWindTurbinePowerCurveVT(D=None):
"""
Generate a random turbine and power curve using the GenericWindTurbinePowerCurveVT class
Parameters
----------
D float, default=random, (optional)
The wind turbine rotor diameter
Returns
-------
wt_desc GenericWindTurbinePowerCurveVT
A random wind turbine power curve and c_t curve variable tree
"""
if not D:
D = 200 * random()
wt_desc = GenericWindTurbinePowerCurveVT()
wt_desc.rotor_diameter = D
wt_desc.hub_height = D * (0.5 + random())
wt_desc.cut_in_wind_speed = 2. + 4. * random()
wt_desc.cut_out_wind_speed = 20. + 10. * random()
rho = 1.225
rated_wind_speed = 8. + 4. * random()
max_a = 0.333 * random()
max_cp = 4 * max_a * (1 - max_a)**2.
max_ct = 4 * max_a * (1 - max_a)
A = 0.25 * pi * D**2. # Rotor area
ideal_power = lambda ws: 0.5 * rho * A * max_cp * ws**3.
real_power = lambda ws: ideal_power(
ws) if ws < rated_wind_speed else ideal_power(rated_wind_speed)
#a_ct = -sqrt(-c_t + 1)/2 + 1/2
ct_from_cp = lambda cp: min(0.89, cp * 2.)
cp_from_power = lambda power, ws: power / (0.5 * rho * A * ws**3.)
ct_from_power = lambda pws: ct_from_cp(cp_from_power(pws[0], pws[1]))
N = 3 + int(random() * 100)
ws = linspace(wt_desc.cut_in_wind_speed, wt_desc.cut_out_wind_speed, N)
wt_desc.power_curve = vstack([ws, map(real_power, ws)]).T
wt_desc.c_t_curve = vstack(
[ws, map(ct_from_power, zip(wt_desc.power_curve[:, 1], ws))]).T
wt_desc.power_rating = ideal_power(rated_wind_speed)
wt_desc.rated_wind_speed = rated_wind_speed
wt_desc.air_density = rho
wt_desc.test_consistency()
return wt_desc
def test_init(self):
gwtpc = GenericWindTurbinePowerCurveVT()
def generate_random_GenericWindTurbinePowerCurveVT(D=None):
"""
Generate a random turbine and power curve using the GenericWindTurbinePowerCurveVT class
Parameters
----------
D float, default=random, (optional)
The wind turbine rotor diameter
Returns
-------
wt_desc GenericWindTurbinePowerCurveVT
A random wind turbine power curve and c_t curve variable tree
"""
if not D:
D = 200*random()
wt_desc = GenericWindTurbinePowerCurveVT()
wt_desc.rotor_diameter = D
wt_desc.hub_height = D * (0.5 + random())
wt_desc.cut_in_wind_speed = 2. + 4. * random()
wt_desc.cut_out_wind_speed = 20. + 10. * random()
rho = 1.225
rated_wind_speed = 8. + 4. * random()
max_a = 0.333 * random()
max_cp = 4 * max_a * (1 - max_a)**2.
max_ct = 4 * max_a * (1 - max_a)
A = 0.25 * pi * D**2. # Rotor area
ideal_power = lambda ws: 0.5 * rho * A * max_cp * ws **3.
real_power = lambda ws: ideal_power(ws) if ws < rated_wind_speed else ideal_power(rated_wind_speed)
#a_ct = -sqrt(-c_t + 1)/2 + 1/2
ct_from_cp = lambda cp: min(0.89, cp * 2.)
cp_from_power = lambda power, ws: power/(0.5 * rho * A * ws**3.)
ct_from_power = lambda pws: ct_from_cp(cp_from_power(pws[0], pws[1]))
N = 3+int(random() * 100)
ws = linspace(wt_desc.cut_in_wind_speed, wt_desc.cut_out_wind_speed, N)
wt_desc.power_curve = vstack([ws, map(real_power, ws)]).T
wt_desc.c_t_curve = vstack([ws, map(ct_from_power, zip(wt_desc.power_curve[:,1],ws))]).T
wt_desc.power_rating = ideal_power(rated_wind_speed)
wt_desc.rated_wind_speed = rated_wind_speed
wt_desc.air_density = rho
wt_desc.test_consistency()
return wt_desc
