#################################################################################
# The Institute for the Design of Advanced Energy Systems Integrated Platform
# Framework (IDAES IP) was produced under the DOE Institute for the
# Design of Advanced Energy Systems (IDAES).
#
# Copyright (c) 2018-2023 by the software owners: The Regents of the
# University of California, through Lawrence Berkeley National Laboratory,
# National Technology & Engineering Solutions of Sandia, LLC, Carnegie Mellon
# University, West Virginia University Research Corporation, et al.
# All rights reserved. Please see the files COPYRIGHT.md and LICENSE.md
# for full copyright and license information.
#################################################################################
"""
Multistage steam turbine for power generation.
Liese, (2014). "Modeling of a Steam Turbine Including Partial Arc Admission
for Use in a Process Simulation Software Environment." Journal of Engineering
for Gas Turbines and Power. v136, November
"""
# TODO: Missing docstrings
# pylint: disable=missing-class-docstring
import copy
import pyomo.environ as pyo
from pyomo.network import Arc
from pyomo.common.config import ConfigBlock, ConfigValue, ConfigList, In
from idaes.core import declare_process_block_class, UnitModelBlockData, useDefault
from idaes.models_extra.power_generation.unit_models.helm import (
HelmSplitter,
HelmMixer,
MomentumMixingType,
HelmTurbineInletStage,
HelmTurbineStage,
HelmTurbineOutletStage,
ValveFunctionType,
)
from idaes.models_extra.power_generation.unit_models.helm import HelmValve as SteamValve
from idaes.core.util.config import is_physical_parameter_block
from idaes.core.util import from_json, to_json, StoreSpec
from idaes.core.util.initialization import propagate_state
import idaes.core.util.scaling as iscale
import idaes.logger as idaeslog
_log = idaeslog.getLogger(__name__)
def _define_turbine_multistage_config(config):
config.declare(
"dynamic",
ConfigValue(
domain=In([False]),
default=False,
description="Dynamic model flag",
doc="Only False, in a dynamic flowsheet this is pseudo-steady-state.",
),
)
config.declare(
"has_holdup",
ConfigValue(
default=False,
domain=In([False]),
description="Holdup construction flag",
doc="Only False, in a dynamic flowsheet this is pseudo-steady-state.",
),
)
config.declare(
"property_package",
ConfigValue(
default=useDefault,
domain=is_physical_parameter_block,
description="Property package to use for control volume",
doc="""Property parameter object used to define property calculations,
**default** - useDefault.
**Valid values:** {
**useDefault** - use default package from parent model or flowsheet,
**PropertyParameterObject** - a PropertyParameterBlock object.}""",
),
)
config.declare(
"property_package_args",
ConfigBlock(
implicit=True,
description="Arguments to use for constructing property packages",
doc="""A ConfigBlock with arguments to be passed to a property block(s)
and used when constructing these,
**default** - None.
**Valid values:** {
see property package for documentation.}""",
),
)
config.declare(
"num_parallel_inlet_stages",
ConfigValue(
default=4,
domain=int,
description="Number of parallel inlet stages to simulate partial arc "
"admission. Default=4",
),
)
config.declare(
"throttle_valve_function",
ConfigValue(
default=ValveFunctionType.linear,
domain=In(ValveFunctionType),
description="Valve function type, if custom provide an expression rule",
doc="""The type of valve function, if custom provide an expression rule
with the valve_function_rule argument.
**default** - ValveFunctionType.linear
**Valid values** - {
ValveFunctionType.linear,
ValveFunctionType.quick_opening,
ValveFunctionType.equal_percentage,
ValveFunctionType.custom}""",
),
)
config.declare(
"throttle_valve_function_callback",
ConfigValue(
default=None,
description="A callback to add a custom valve function to the "
"throttle valves or None. If a callback is provided, it should "
"take the valve block data as an argument and add a "
"valve_function expressions to it. Default=None",
),
)
config.declare(
"num_hp",
ConfigValue(
default=2,
domain=int,
description="Number of high pressure stages not including inlet stage",
doc="Number of high pressure stages not including inlet stage",
),
)
config.declare(
"num_ip",
ConfigValue(
default=10,
domain=int,
description="Number of intermediate pressure stages",
doc="Number of intermediate pressure stages",
),
)
config.declare(
"num_lp",
ConfigValue(
default=5,
domain=int,
description="Number of low pressure stages not including outlet stage",
doc="Number of low pressure stages not including outlet stage",
),
)
config.declare(
"hp_split_locations",
ConfigList(
default=[],
domain=int,
description="Locations of splitters in HP section",
doc="A list of index locations of splitters in the HP section. The "
"indexes indicate after which stage to include splitters. 0 is "
"between the inlet stage and the first regular HP stage.",
),
)
config.declare(
"ip_split_locations",
ConfigList(
default=[],
domain=int,
description="Locations of splitters in IP section",
doc="A list of index locations of splitters in the IP section. The "
"indexes indicate after which stage to include splitters.",
),
)
config.declare(
"lp_split_locations",
ConfigList(
default=[],
domain=int,
description="Locations of splitter in LP section",
doc="A list of index locations of splitters in the LP section. The "
"indexes indicate after which stage to include splitters.",
),
)
config.declare(
"hp_disconnect",
ConfigList(
default=[],
domain=int,
description="HP Turbine stages to not connect to next with an arc.",
doc="HP Turbine stages to not connect to next with an arc. This is "
"usually used to insert additional units between stages on a "
"flowsheet, such as a reheater",
),
)
config.declare(
"ip_disconnect",
ConfigList(
default=[],
domain=int,
description="IP Turbine stages to not connect to next with an arc.",
doc="IP Turbine stages to not connect to next with an arc. This is "
"usually used to insert additional units between stages on a "
"flowsheet, such as a reheater",
),
)
config.declare(
"lp_disconnect",
ConfigList(
default=[],
domain=int,
description="LP Turbine stages to not connect to next with an arc.",
doc="LP Turbine stages to not connect to next with an arc. This is "
"usually used to insert additional units between stages on a "
"flowsheet, such as a reheater",
),
)
config.declare(
"hp_split_num_outlets",
ConfigValue(
default={},
domain=dict,
description="Dict, hp split index: number of splitter outlets, if not 2",
),
)
config.declare(
"ip_split_num_outlets",
ConfigValue(
default={},
domain=dict,
description="Dict, ip split index: number of splitter outlets, if not 2",
),
)
config.declare(
"lp_split_num_outlets",
ConfigValue(
default={},
domain=dict,
description="Dict, lp split index: number of splitter outlets, if not 2",
),
)
[docs]@declare_process_block_class(
"HelmTurbineMultistage",
doc="Multistage steam turbine with optional reheat and extraction",
)
class HelmTurbineMultistageData(UnitModelBlockData):
CONFIG = ConfigBlock()
_define_turbine_multistage_config(CONFIG)
[docs] def build(self):
super().build()
config = self.config
unit_cfg = { # general unit model config
"dynamic": config.dynamic,
"has_holdup": config.has_holdup,
"property_package": config.property_package,
"property_package_args": config.property_package_args,
}
ni = self.config.num_parallel_inlet_stages
inlet_idx = self.inlet_stage_idx = pyo.RangeSet(ni)
thrtl_cfg = unit_cfg.copy()
thrtl_cfg["valve_function"] = self.config.throttle_valve_function
thrtl_cfg[
"valve_function_callback"
] = self.config.throttle_valve_function_callback
# Adding unit models
# ------------------------
# Splitter to inlet that splits main flow into parallel flows for
# partial arc admission to the turbine
self.inlet_split = HelmSplitter(**self._split_cfg(unit_cfg, ni))
self.throttle_valve = SteamValve(inlet_idx, **thrtl_cfg)
self.inlet_stage = HelmTurbineInletStage(inlet_idx, **unit_cfg)
# mixer to combine the parallel flows back together
self.inlet_mix = HelmMixer(**self._mix_cfg(unit_cfg, ni))
# add turbine sections.
# inlet stage -> hp stages -> ip stages -> lp stages -> outlet stage
self.hp_stages = HelmTurbineStage(pyo.RangeSet(config.num_hp), **unit_cfg)
self.ip_stages = HelmTurbineStage(pyo.RangeSet(config.num_ip), **unit_cfg)
self.lp_stages = HelmTurbineStage(pyo.RangeSet(config.num_lp), **unit_cfg)
self.outlet_stage = HelmTurbineOutletStage(**unit_cfg)
for i in self.hp_stages:
self.hp_stages[i].ratioP.fix()
self.hp_stages[i].efficiency_isentropic.fix()
for i in self.ip_stages:
self.ip_stages[i].ratioP.fix()
self.ip_stages[i].efficiency_isentropic.fix()
for i in self.lp_stages:
self.lp_stages[i].ratioP.fix()
self.lp_stages[i].efficiency_isentropic.fix()
# Then make splitter config. If number of outlets is specified
# make a specific config, otherwise use default with 2 outlets
s_sfg_default = self._split_cfg(unit_cfg, 2)
hp_splt_cfg = {}
ip_splt_cfg = {}
lp_splt_cfg = {}
# Now to finish up if there are more than two outlets, set that
for i, v in config.hp_split_num_outlets.items():
hp_splt_cfg[i] = self._split_cfg(unit_cfg, v)
for i, v in config.ip_split_num_outlets.items():
ip_splt_cfg[i] = self._split_cfg(unit_cfg, v)
for i, v in config.lp_split_num_outlets.items():
lp_splt_cfg[i] = self._split_cfg(unit_cfg, v)
# put in splitters for turbine steam extractions
if config.hp_split_locations:
self.hp_split = HelmSplitter(
config.hp_split_locations, **s_sfg_default, initialize=hp_splt_cfg
)
else:
self.hp_split = {}
if config.ip_split_locations:
self.ip_split = HelmSplitter(
config.ip_split_locations, **s_sfg_default, initialize=ip_splt_cfg
)
else:
self.ip_split = {}
if config.lp_split_locations:
self.lp_split = HelmSplitter(
config.lp_split_locations, **s_sfg_default, initialize=lp_splt_cfg
)
else:
self.lp_split = {}
# Done with unit models. Adding Arcs (streams).
# ------------------------------------------------
# First up add streams in the inlet section
def _split_to_rule(b, i):
return {
"source": getattr(self.inlet_split, "outlet_{}".format(i)),
"destination": self.throttle_valve[i].inlet,
}
def _valve_to_rule(b, i):
return {
"source": self.throttle_valve[i].outlet,
"destination": self.inlet_stage[i].inlet,
}
def _inlet_to_rule(b, i):
return {
"source": self.inlet_stage[i].outlet,
"destination": getattr(self.inlet_mix, "inlet_{}".format(i)),
}
self.stream_throttle_inlet = Arc(inlet_idx, rule=_split_to_rule)
self.stream_throttle_outlet = Arc(inlet_idx, rule=_valve_to_rule)
self.stream_inlet_mix_inlet = Arc(inlet_idx, rule=_inlet_to_rule)
# There are three sections HP, IP, and LP which all have the same sort
# of internal connctions, so the functions below provide some generic
# capcbilities for adding the internal Arcs (streams).
def _arc_indexes(nstages, index_set, discon, splits):
"""
This takes the index set of all possible streams in a turbine
section and throws out arc indexes for stages that are disconnected
and arc indexes that are not needed because there is no splitter
after a stage.
Args:
nstages (int): Number of stages in section
index_set (Set): Index set for arcs in the section
discon (list): Disconnected stages in the section
splits (list): Spliter locations
"""
sr = set() # set of things to remove from the Arc index set
for i in index_set:
if (i[0] in discon or i[0] == nstages) and i[0] in splits:
# don't connect stage i to next remove stream after split
sr.add((i[0], 2))
elif (i[0] in discon or i[0] == nstages) and i[0] not in splits:
# no splitter and disconnect so remove both streams
sr.add((i[0], 1))
sr.add((i[0], 2))
elif i[0] not in splits:
# no splitter and not disconnected so just second stream
sr.add((i[0], 2))
else:
# has splitter so need both streams don't remove anything
pass
for i in sr: # remove the unneeded Arc indexes
index_set.remove(i)
def _arc_rule(turbines, splitters):
"""
This creates a rule function for arcs in a turbine section. When
this is used, the indexes for nonexistent stream will have already
been removed, so any indexes the rule will get should have a stream
associated.
Args:
turbines (TurbineStage): Indexed block with turbine section stages
splitters (Separator): Indexed block of splitters
"""
def _rule(b, i, j):
if i in splitters and j == 1: # stage to splitter
return {
"source": turbines[i].outlet,
"destination": splitters[i].inlet,
}
elif j == 2: # splitter to next stage
return {
"source": splitters[i].outlet_1,
"destination": turbines[i + 1].inlet,
}
else: # no splitter, stage to next stage
return {
"source": turbines[i].outlet,
"destination": turbines[i + 1].inlet,
}
return _rule
# Create initial arcs index sets with all possible streams
self.hp_stream_idx = pyo.Set(initialize=self.hp_stages.index_set() * [1, 2])
self.ip_stream_idx = pyo.Set(initialize=self.ip_stages.index_set() * [1, 2])
self.lp_stream_idx = pyo.Set(initialize=self.lp_stages.index_set() * [1, 2])
# Throw out unneeded streams for disconnected stages or no splitter
_arc_indexes(
config.num_hp,
self.hp_stream_idx,
config.hp_disconnect,
config.hp_split_locations,
)
_arc_indexes(
config.num_ip,
self.ip_stream_idx,
config.ip_disconnect,
config.ip_split_locations,
)
_arc_indexes(
config.num_lp,
self.lp_stream_idx,
config.lp_disconnect,
config.lp_split_locations,
)
# Create connections internal to each turbine section (hp, ip, and lp)
self.hp_stream = Arc(
self.hp_stream_idx, rule=_arc_rule(self.hp_stages, self.hp_split)
)
self.ip_stream = Arc(
self.ip_stream_idx, rule=_arc_rule(self.ip_stages, self.ip_split)
)
self.lp_stream = Arc(
self.lp_stream_idx, rule=_arc_rule(self.lp_stages, self.lp_split)
)
# Connect hp section to ip section unless its a disconnect location
last_hp = config.num_hp
if 0 not in config.ip_disconnect and last_hp not in config.hp_disconnect:
# Not disconnected stage so add stream, depending on splitter existence
if last_hp in config.hp_split_locations: # connect splitter to ip
self.hp_to_ip_stream = Arc(
source=self.hp_split[last_hp].outlet_1,
destination=self.ip_stages[1].inlet,
)
else: # connect last hp to ip
self.hp_to_ip_stream = Arc(
source=self.hp_stages[last_hp].outlet,
destination=self.ip_stages[1].inlet,
)
# Connect ip section to lp section unless its a disconnect location
last_ip = config.num_ip
if 0 not in config.lp_disconnect and last_ip not in config.ip_disconnect:
if last_ip in config.ip_split_locations: # connect splitter to ip
self.ip_to_lp_stream = Arc(
source=self.ip_split[last_ip].outlet_1,
destination=self.lp_stages[1].inlet,
)
else: # connect last hp to ip
self.ip_to_lp_stream = Arc(
source=self.ip_stages[last_ip].outlet,
destination=self.lp_stages[1].inlet,
)
# Connect inlet stage to hp section
# not allowing disconnection of inlet and first regular hp stage
if 0 in config.hp_split_locations:
# connect inlet mix to splitter and splitter to hp section
self.inlet_to_splitter_stream = Arc(
source=self.inlet_mix.outlet, destination=self.hp_split[0].inlet
)
self.splitter_to_hp_stream = Arc(
source=self.hp_split[0].outlet_1, destination=self.hp_stages[1].inlet
)
else: # connect mixer to first hp turbine stage
self.inlet_to_hp_stream = Arc(
source=self.inlet_mix.outlet, destination=self.hp_stages[1].inlet
)
self.power = pyo.Var(
self.flowsheet().time,
initialize=-1e8,
doc="total turbine power",
units=pyo.units.W,
)
@self.Constraint(self.flowsheet().time)
def power_eqn(b, t):
return b.power[t] == b.outlet_stage.control_volume.work[
t
] * b.outlet_stage.efficiency_mech + sum(
b.inlet_stage[i].control_volume.work[t]
* b.inlet_stage[i].efficiency_mech
for i in b.inlet_stage
) + sum(
b.hp_stages[i].control_volume.work[t] * b.hp_stages[i].efficiency_mech
for i in b.hp_stages
) + sum(
b.ip_stages[i].control_volume.work[t] * b.ip_stages[i].efficiency_mech
for i in b.ip_stages
) + sum(
b.lp_stages[i].control_volume.work[t] * b.lp_stages[i].efficiency_mech
for i in b.lp_stages
)
# Connect lp section to outlet stage, not allowing outlet stage to be
# disconnected
last_lp = config.num_lp
if last_lp in config.lp_split_locations: # connect splitter to outlet
self.lp_to_outlet_stream = Arc(
source=self.lp_split[last_lp].outlet_1,
destination=self.outlet_stage.inlet,
)
else: # connect last lpstage to outlet
self.lp_to_outlet_stream = Arc(
source=self.lp_stages[last_lp].outlet,
destination=self.outlet_stage.inlet,
)
pyo.TransformationFactory("network.expand_arcs").apply_to(self)
def _split_cfg(self, unit_cfg, no=2):
"""
This creates a configuration dictionary for a splitter.
Args:
unit_cfg: The base unit config dict.
no: Number of outlets, default=2
"""
# Create a dict for splitter config args
cfg = copy.copy(unit_cfg)
cfg.update(num_outlets=no)
return cfg
def _mix_cfg(self, unit_cfg, ni=2):
"""
This creates a configuration dictionary for a mixer.
Args:
unit_cfg: The base unit config dict.
ni: Number of inlets, default=2
"""
cfg = copy.copy(unit_cfg)
cfg.update(
num_inlets=ni, momentum_mixing_type=MomentumMixingType.minimize_and_equality
)
return cfg
[docs] def throttle_cv_fix(self, value):
"""
Fix the thottle valve coefficients. These are generally the same for
each of the parallel stages so this provides a convenient way to set
them.
Args:
value: The value to fix the turbine inlet flow coefficients at
"""
for i in self.throttle_valve:
self.throttle_valve[i].Cv.fix(value)
[docs] def turbine_inlet_cf_fix(self, value):
"""
Fix the inlet turbine stage flow coefficient. These are
generally the same for each of the parallel stages so this provides
a convenient way to set them.
Args:
value: The value to fix the turbine inlet flow coefficients at
"""
for i in self.inlet_stage:
self.inlet_stage[i].flow_coeff.fix(value)
def _init_section(
self,
stages,
splits,
disconnects,
prev_port,
outlvl,
solver,
optarg,
copy_disconnected_flow,
copy_disconnected_pressure,
):
"""Reuse the initializtion for HP, IP and, LP sections."""
if 0 in splits:
propagate_state(splits[0].inlet, prev_port)
splits[0].initialize(outlvl=outlvl, solver=solver, optarg=optarg)
prev_port = splits[0].outlet_1
for i in stages:
if i - 1 not in disconnects:
propagate_state(stages[i].inlet, prev_port)
else:
if copy_disconnected_flow:
for t in stages[i].inlet.flow_mol:
stages[i].inlet.flow_mol[t] = pyo.value(prev_port.flow_mol[t])
if copy_disconnected_pressure:
for t in stages[i].inlet.pressure:
stages[i].inlet.pressure[t] = pyo.value(prev_port.pressure[t])
stages[i].initialize(outlvl=outlvl, solver=solver, optarg=optarg)
prev_port = stages[i].outlet
if i in splits:
propagate_state(splits[i].inlet, prev_port)
splits[i].initialize(outlvl=outlvl, solver=solver, optarg=optarg)
prev_port = splits[i].outlet_1
return prev_port
[docs] def turbine_outlet_cf_fix(self, value):
"""
Fix the inlet turbine stage flow coefficient. These are
generally the same for each of the parallel stages so this provides
a convenient way to set them.
Args:
value: The value to fix the turbine inlet flow coefficients at
"""
self.outlet_stage.flow_coeff.fix(value)
[docs] def initialize_build(
self,
outlvl=idaeslog.NOTSET,
solver=None,
flow_iterate=2,
optarg=None,
copy_disconnected_flow=True,
copy_disconnected_pressure=True,
calculate_outlet_cf=False,
calculate_inlet_cf=False,
):
"""
Initialize
Args:
outlvl: logging level default is NOTSET, which inherits from the
parent logger
solver: the NL solver
flow_iterate: If not calculating flow coefficients, this is the
number of times to update the flow and repeat initialization
(1 to 5 where 1 does not update the flow guess)
optarg: solver arguments, default is None
copy_disconnected_flow: Copy the flow through the disconnected stages
default is True
copy_disconnected_pressure: Copy the pressure through the disconnected
stages default is True
calculate_outlet_cf: Use the flow initial flow guess to calculate
the outlet stage flow coefficient, default is False,
calculate_inlet_cf: Use the inlet stage ratioP to calculate the flow
coefficient for the inlet stage default is False
Returns:
None
"""
# Setup loggers
# Store initial model specs, restored at the end of initializtion, so
# the problem is not altered. This can restore fixed/free vars,
# active/inactive constraints, and fixed variable values.
sp = StoreSpec.value_isfixed_isactive(only_fixed=True)
istate = to_json(self, return_dict=True, wts=sp)
for it_count in range(flow_iterate):
self.inlet_split.initialize(outlvl=outlvl, solver=solver, optarg=optarg)
# Initialize valves
for i in self.inlet_stage_idx:
u = self.throttle_valve[i]
propagate_state(
u.inlet, getattr(self.inlet_split, "outlet_{}".format(i))
)
u.initialize(outlvl=outlvl, solver=solver, optarg=optarg)
# Initialize turbine
for i in self.inlet_stage_idx:
u = self.inlet_stage[i]
propagate_state(u.inlet, self.throttle_valve[i].outlet)
u.initialize(
outlvl=outlvl,
solver=solver,
optarg=optarg,
calculate_cf=calculate_inlet_cf,
)
# Initialize Mixer
self.inlet_mix.use_minimum_inlet_pressure_constraint()
for i in self.inlet_stage_idx:
propagate_state(
getattr(self.inlet_mix, "inlet_{}".format(i)),
self.inlet_stage[i].outlet,
)
getattr(self.inlet_mix, "inlet_{}".format(i)).fix()
self.inlet_mix.initialize(outlvl=outlvl, solver=solver, optarg=optarg)
for i in self.inlet_stage_idx:
getattr(self.inlet_mix, "inlet_{}".format(i)).unfix()
self.inlet_mix.use_equal_pressure_constraint()
prev_port = self.inlet_mix.outlet
prev_port = self._init_section(
self.hp_stages,
self.hp_split,
self.config.hp_disconnect,
prev_port,
outlvl,
solver,
optarg,
copy_disconnected_flow=copy_disconnected_flow,
copy_disconnected_pressure=copy_disconnected_pressure,
)
if len(self.hp_stages) in self.config.hp_disconnect:
self.config.ip_disconnect.append(0)
prev_port = self._init_section(
self.ip_stages,
self.ip_split,
self.config.ip_disconnect,
prev_port,
outlvl,
solver,
optarg,
copy_disconnected_flow=copy_disconnected_flow,
copy_disconnected_pressure=copy_disconnected_pressure,
)
if len(self.ip_stages) in self.config.ip_disconnect:
self.config.lp_disconnect.append(0)
prev_port = self._init_section(
self.lp_stages,
self.lp_split,
self.config.lp_disconnect,
prev_port,
outlvl,
solver,
optarg,
copy_disconnected_flow=copy_disconnected_flow,
copy_disconnected_pressure=copy_disconnected_pressure,
)
propagate_state(self.outlet_stage.inlet, prev_port)
self.outlet_stage.initialize(
outlvl=outlvl,
solver=solver,
optarg=optarg,
calculate_cf=calculate_outlet_cf,
)
if calculate_outlet_cf:
break
if it_count < flow_iterate - 1:
for t in self.inlet_split.inlet.flow_mol:
self.inlet_split.inlet.flow_mol[
t
].value = self.outlet_stage.inlet.flow_mol[t].value
for s in self.hp_split.values():
for i, o in enumerate(s.outlet_list):
if i == 0:
continue
o = getattr(s, o)
self.inlet_split.inlet.flow_mol[t].value += o.flow_mol[
t
].value
for s in self.ip_split.values():
for i, o in enumerate(s.outlet_list):
if i == 0:
continue
o = getattr(s, o)
self.inlet_split.inlet.flow_mol[t].value += o.flow_mol[
t
].value
for s in self.lp_split.values():
for i, o in enumerate(s.outlet_list):
if i == 0:
continue
o = getattr(s, o)
self.inlet_split.inlet.flow_mol[t].value += o.flow_mol[
t
].value
if calculate_inlet_cf:
# cf was probably fixed, so will have to set the value again here
# if you ask for it to be calculated.
icf = {}
for i in self.inlet_stage:
for t in self.inlet_stage[i].flow_coeff:
icf[i, t] = pyo.value(self.inlet_stage[i].flow_coeff[t])
if calculate_outlet_cf:
ocf = pyo.value(self.outlet_stage.flow_coeff)
from_json(self, sd=istate, wts=sp)
if calculate_inlet_cf:
# cf was probably fixed, so will have to set the value again here
# if you ask for it to be calculated.
for t in self.inlet_stage[i].flow_coeff:
for i in self.inlet_stage:
self.inlet_stage[i].flow_coeff[t] = icf[i, t]
if calculate_outlet_cf:
self.outlet_stage.flow_coeff = ocf
def calculate_scaling_factors(self):
super().calculate_scaling_factors()
# Add a default power scale
# pretty safe to say power is around 100 to 1000 MW
for t in self.power:
if iscale.get_scaling_factor(self.power[t]) is None:
iscale.set_scaling_factor(self.power[t], 1e-8)
for t, c in self.power_eqn.items():
power_scale = iscale.get_scaling_factor(
self.power[t], default=1, warning=True
)
# Set power equation scale factor
iscale.constraint_scaling_transform(c, power_scale, overwrite=False)
def _get_stream_table_contents(self, time_point=0):
raise NotImplementedError(
"The multi-stage turbine model has not implemented the code necessary to "
"construct a stream table."
)
