Revised ResourcePrice class and methods. Added tests for problem...

Revised ResourcePrice class and methods. Added tests for problem simplification routines. Started problem identification method.

src/topupopt/problems/esipp/converter.py

@@ -6,6 +6,7 @@ import numpy as np
 # local libraries, internal
 from .dynsys import DynamicSystem
 from .signal import Signal, FixedSignal
+from .time import TimeFrame
 
 # *****************************************************************************
 # *****************************************************************************
@@ -15,11 +16,17 @@ from .signal import Signal, FixedSignal
 
 class Converter:
     """A class for modular dynamic systems in an integrated energy system."""
+    
+    # input options:
+    # 1) DynamicSystem object
+    # 2) Matrices
 
     def __init__(
         self,
         # system information
         sys: DynamicSystem,
+        # time frame
+        time_frame: TimeFrame,
         # initial conditions
         initial_states: np.array,
         # optimisation-relevant parameters