feat: DCE (Declaration-Collection-Execution) pattern for vectorized model creation

flixopt/components.py

@@ -819,6 +819,10 @@ def _do_modeling(self):
         """Create transmission efficiency equations and optional absolute loss constraints for both flow directions"""
         super()._do_modeling()
 
+        # In DCE mode, skip constraint creation - constraints will be added later
+        if self._model._dce_mode:
+            return
+
         # first direction
         self.create_transmission_equation('dir1', self.element.in1, self.element.out1)
 
@@ -870,6 +874,10 @@ def _do_modeling(self):
         """Create linear conversion equations or piecewise conversion constraints between input and output flows"""
         super()._do_modeling()
 
+        # In DCE mode, skip constraint creation - constraints will be added later
+        if self._model._dce_mode:
+            return
+
         # Create conversion factor constraints if specified
         if self.element.conversion_factors:
             all_input_flows = set(self.element.inputs)
@@ -929,6 +937,9 @@ def __init__(self, model: FlowSystemModel, element: Storage):
     def _do_modeling(self):
         """Create charge state variables, energy balance equations, and optional investment submodels."""
         super()._do_modeling()
+        # In DCE mode, skip variable/constraint creation - will be added later
+        if self._model._dce_mode:
+            return
         self._create_storage_variables()
         self._add_netto_discharge_constraint()
         self._add_energy_balance_constraint()
@@ -1307,6 +1318,9 @@ def _do_modeling(self):
         inter-cluster linking. Overrides specific methods to customize behavior.
         """
         super()._do_modeling()
+        # In DCE mode, skip constraint creation - constraints will be added later
+        if self._model._dce_mode:
+            return
         self._add_intercluster_linking()
 
     def _add_cluster_cyclic_constraint(self):