solph.flows._non_convex_flow_block.NonConvexFlowBlock._create_variables() - Code Metrics - Inspection of "Merge pull request #1220 from oemof/revision/separ..." - oemof/oemof-solph - Measure and Improve Code Quality continuously with Scrutinizer

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Push — dev ( 93e34e...2bb17a )

by Patrik

created 2025-11-03 10:12 UTC

NonConvexFlowBlock._create_variables() A

↳ Parent: solph.flows._non_convex_flow_block

Complexity

Conditions

Size

Total Lines	34
Code Lines	17

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
eloc	17
dl	0
loc	34
rs	9.55
c	0
b	0
f	0
cc	4
nop	1

# -*- coding: utf-8 -*-

"""Creating sets, variables, constraints and parts of the objective function
for Flow objects with nonconvex but without investment options.

SPDX-FileCopyrightText: Uwe Krien <[email protected]>
SPDX-FileCopyrightText: Simon Hilpert
SPDX-FileCopyrightText: Cord Kaldemeyer
SPDX-FileCopyrightText: Patrik Schönfeldt
SPDX-FileCopyrightText: Birgit Schachler
SPDX-FileCopyrightText: jnnr
SPDX-FileCopyrightText: jmloenneberga
SPDX-FileCopyrightText: Johannes Kochems

SPDX-License-Identifier: MIT

"""

from pyomo.core import Binary
from pyomo.core import Constraint
from pyomo.core import Expression
from pyomo.core import NonNegativeReals
from pyomo.core import Set
from pyomo.core import Var
from pyomo.core.base.block import ScalarBlock

from . import _shared


class NonConvexFlowBlock(ScalarBlock):
    r"""
    .. automethod:: _create_constraints
    .. automethod:: _create_variables
    .. automethod:: _create_sets

    .. automethod:: _objective_expression

    Parameters are defined in :class:`Flow`.
    """

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

    def _create(self, group=None):
        """Creates set, variables, constraints for all flow object with
        an attribute flow of type class:`.NonConvexFlowBlock`.

        Parameters
        ----------
        group : list
            List of oemof.solph.NonConvexFlowBlock objects for which
            the constraints are build.
        """
        if group is None:
            return None

        self._create_sets(group)
        self._create_variables()
        self._create_constraints()

    def _create_sets(self, group):
        r"""
        **The following sets are created:** (-> see basic sets at
        :class:`.Model` )

        FIXED_CAPACITY_NONCONVEX_FLOWS
            A set of flows with the attribute `nonconvex` of type
            :class:`.options.NonConvex`.

        Also creates everything listed in `_sets_for_non_convex_flows`.
        """
        self.FIXED_CAPACITY_NONCONVEX_FLOWS = Set(
            initialize=[(g[0], g[1]) for g in group]
        )

        _shared.sets_for_non_convex_flows(self, group)

    def _create_variables(self):
        r"""
        :math:`Y_{status}` (binary) `om.NonConvexFlowBlock.status`:
            Variable indicating if flow is >= 0

        :math:`P_{max,status}` Status_nominal (continuous)
            Variable indicating if flow is >= 0

        Also creates :py:func:`_variables_for_non_convex_flows`.
        """
        m = self.parent_block()
        self.status = Var(
            self.FIXED_CAPACITY_NONCONVEX_FLOWS, m.TIMESTEPS, within=Binary
        )
        for o, i in self.FIXED_CAPACITY_NONCONVEX_FLOWS:
            if m.flows[o, i].nonconvex.initial_status is not None:
                for t in range(
                    0, m.flows[o, i].nonconvex.first_flexible_timestep
                ):
                    self.status[o, i, t] = m.flows[
                        o, i
                    ].nonconvex.initial_status
                    self.status[o, i, t].fix()

        # `status_nominal` is a parameter which represents the
        # multiplication of a binary variable (`status`)
        # and a continuous variable (`invest` or `nominal_capacity`)
        self.status_nominal = Var(
            self.FIXED_CAPACITY_NONCONVEX_FLOWS,
            m.TIMESTEPS,
            within=NonNegativeReals,
        )

        _shared.variables_for_non_convex_flows(self)

    def _create_constraints(self):
        """
        The following constraints are created:

        .. automethod:: _status_nominal_constraint

        Also creates: :py:func:`_minimum_flow_constraint`,
        :py:func:`_maximum_flow_constraint`, and
        :py:func:`_shared_constraints_for_non_convex_flows`.

        """

        self.status_nominal_constraint = self._status_nominal_constraint()
        self.min = _shared.minimum_flow_constraint(self)
        self.max = _shared.maximum_flow_constraint(self)

        _shared.shared_constraints_for_non_convex_flows(self)

    def _objective_expression(self):
        r"""
        The following terms are to the cost function:

        * :py:func:`_startup_costs`
        * :py:func:`_shutdown_costs`
        * :py:func:`_activity_costs`
        * :py:func:`_inactivity_costs`
        """
        if not hasattr(self, "FIXED_CAPACITY_NONCONVEX_FLOWS"):
            return 0

        startup_costs = _shared.startup_costs(self)
        shutdown_costs = _shared.shutdown_costs(self)
        activity_costs = _shared.activity_costs(self)
        inactivity_costs = _shared.inactivity_costs(self)

        self.activity_costs = Expression(expr=activity_costs)
        self.inactivity_costs = Expression(expr=inactivity_costs)
        self.startup_costs = Expression(expr=startup_costs)
        self.shutdown_costs = Expression(expr=shutdown_costs)

        self.costs = Expression(
            expr=(
                startup_costs
                + shutdown_costs
                + activity_costs
                + inactivity_costs
            )
        )

        return self.costs

    def _status_nominal_constraint(self):
        r"""
        .. math::
            P_{max,status}(t) =  Y_{status}(t) \cdot P_{nom}, \\
            \forall t \in \textrm{TIMESTEPS}.
        """
        m = self.parent_block()

        def _status_nominal_rule(_, i, o, t):
            """Rule definition for status_nominal"""
            expr = (
                self.status_nominal[i, o, t]
                == self.status[i, o, t] * m.flows[i, o].nominal_capacity
            )
            return expr

        return Constraint(
            self.FIXED_CAPACITY_NONCONVEX_FLOWS,
            m.TIMESTEPS,
            rule=_status_nominal_rule,
        )


1			# -- coding: utf-8 --
2
3			"""Creating sets, variables, constraints and parts of the objective function
4			for Flow objects with nonconvex but without investment options.
5
6			SPDX-FileCopyrightText: Uwe Krien <[email protected]>
7			SPDX-FileCopyrightText: Simon Hilpert
8			SPDX-FileCopyrightText: Cord Kaldemeyer
9			SPDX-FileCopyrightText: Patrik Schönfeldt
10			SPDX-FileCopyrightText: Birgit Schachler
11			SPDX-FileCopyrightText: jnnr
12			SPDX-FileCopyrightText: jmloenneberga
13			SPDX-FileCopyrightText: Johannes Kochems
14
15			SPDX-License-Identifier: MIT
16
17			"""
18
19			from pyomo.core import Binary
20			from pyomo.core import Constraint
21			from pyomo.core import Expression
22			from pyomo.core import NonNegativeReals
23			from pyomo.core import Set
24			from pyomo.core import Var
25			from pyomo.core.base.block import ScalarBlock
26
27			from . import _shared
28
29
30			class NonConvexFlowBlock(ScalarBlock):
31			r"""
32			.. automethod:: _create_constraints
33			.. automethod:: _create_variables
34			.. automethod:: _create_sets
35
36			.. automethod:: _objective_expression
37
38			Parameters are defined in :class:`Flow`.
39			"""
40
41			def __init__(self, args, *kwargs):
42			super().__init__(args, *kwargs)
43
44			def _create(self, group=None):
45			"""Creates set, variables, constraints for all flow object with
46			an attribute flow of type class:`.NonConvexFlowBlock`.
47
48			Parameters
49			----------
50			group : list
51			List of oemof.solph.NonConvexFlowBlock objects for which
52			the constraints are build.
53			"""
54			if group is None:
55			return None
56
57			self._create_sets(group)
58			self._create_variables()
59			self._create_constraints()
60
61			def _create_sets(self, group):
62			r"""
63			The following sets are created: (-> see basic sets at
64			:class:`.Model` )
65
66			FIXED_CAPACITY_NONCONVEX_FLOWS
67			A set of flows with the attribute `nonconvex` of type
68			:class:`.options.NonConvex`.
69
70			Also creates everything listed in `_sets_for_non_convex_flows`.
71			"""
72			self.FIXED_CAPACITY_NONCONVEX_FLOWS = Set(
73			initialize=[(g[0], g[1]) for g in group]
74			)
75
76			_shared.sets_for_non_convex_flows(self, group)
77
78			def _create_variables(self):
79			r"""
80			:math:`Y_{status}` (binary) `om.NonConvexFlowBlock.status`:
81			Variable indicating if flow is >= 0
82
83			:math:`P_{max,status}` Status_nominal (continuous)
84			Variable indicating if flow is >= 0
85
86			Also creates :py:func:`_variables_for_non_convex_flows`.
87			"""
88			m = self.parent_block()
89			self.status = Var(
90			self.FIXED_CAPACITY_NONCONVEX_FLOWS, m.TIMESTEPS, within=Binary
91			)
92			for o, i in self.FIXED_CAPACITY_NONCONVEX_FLOWS:
93			if m.flows[o, i].nonconvex.initial_status is not None:
94			for t in range(
95			0, m.flows[o, i].nonconvex.first_flexible_timestep
96			):
97			self.status[o, i, t] = m.flows[
98			o, i
99			].nonconvex.initial_status
100			self.status[o, i, t].fix()
101
102			# `status_nominal` is a parameter which represents the
103			# multiplication of a binary variable (`status`)
104			# and a continuous variable (`invest` or `nominal_capacity`)
105			self.status_nominal = Var(
106			self.FIXED_CAPACITY_NONCONVEX_FLOWS,
107			m.TIMESTEPS,
108			within=NonNegativeReals,
109			)
110
111			_shared.variables_for_non_convex_flows(self)
112
113			def _create_constraints(self):
114			"""
115			The following constraints are created:
116
117			.. automethod:: _status_nominal_constraint
118
119			Also creates: :py:func:`_minimum_flow_constraint`,
120			:py:func:`_maximum_flow_constraint`, and
121			:py:func:`_shared_constraints_for_non_convex_flows`.
122
123			"""
124
125			self.status_nominal_constraint = self._status_nominal_constraint()
126			self.min = _shared.minimum_flow_constraint(self)
127			self.max = _shared.maximum_flow_constraint(self)
128
129			_shared.shared_constraints_for_non_convex_flows(self)
130
131			def _objective_expression(self):
132			r"""
133			The following terms are to the cost function:
134
135			* :py:func:`_startup_costs`
136			* :py:func:`_shutdown_costs`
137			* :py:func:`_activity_costs`
138			* :py:func:`_inactivity_costs`
139			"""
140			if not hasattr(self, "FIXED_CAPACITY_NONCONVEX_FLOWS"):
141			return 0
142
143			startup_costs = _shared.startup_costs(self)
144			shutdown_costs = _shared.shutdown_costs(self)
145			activity_costs = _shared.activity_costs(self)
146			inactivity_costs = _shared.inactivity_costs(self)
147
148			self.activity_costs = Expression(expr=activity_costs)
149			self.inactivity_costs = Expression(expr=inactivity_costs)
150			self.startup_costs = Expression(expr=startup_costs)
151			self.shutdown_costs = Expression(expr=shutdown_costs)
152
153			self.costs = Expression(
154			expr=(
155			startup_costs
156			+ shutdown_costs
157			+ activity_costs
158			+ inactivity_costs
159			)
160			)
161
162			return self.costs
163
164			def _status_nominal_constraint(self):
165			r"""
166			.. math::
167			P_{max,status}(t) = Y_{status}(t) \cdot P_{nom}, \\
168			\forall t \in \textrm{TIMESTEPS}.
169			"""
170			m = self.parent_block()
171
172			def _status_nominal_rule(_, i, o, t):
173			"""Rule definition for status_nominal"""
174			expr = (
175			self.status_nominal[i, o, t]
176			== self.status[i, o, t] * m.flows[i, o].nominal_capacity
177			)
178			return expr
179
180			return Constraint(
181			self.FIXED_CAPACITY_NONCONVEX_FLOWS,
182			m.TIMESTEPS,
183			rule=_status_nominal_rule,
184			)
185

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Push — dev ( 93e34e...2bb17a )

NonConvexFlowBlock._create_variables() A

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