Fix power connector balance

CHANGELOG.md

@@ -8,6 +8,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 
 ### Fixed <!--Make sure to add a link to the PR and issues related to your change-->
+ - Fixed [#99](https://github.com/Metroscope-dev/metroscope-modeling-library/issues/99) in [#278](https://github.com/Metroscope-dev/metroscope-modeling-library/pull/278), by adding a `not_used` effort variable to power inlets and outlets. Local balance is ensured by defining `C_in(not_used = 0)` in all power inlets. ⚠️ This fix works only because we have not several power inlets in one power connection set.
  - Fixed [#273](https://github.com/Metroscope-dev/metroscope-modeling-library/issues/273), steam extraction splitter'`x` are lower than 1 [PR#275](https://github.com/Metroscope-dev/metroscope-modeling-library/pull/275)
  - Fixed `IsoHFlowModel` and `IsoPHFlowModel` now use `h_0` as `h` start value with [PR #265]([url](https://github.com/Metroscope-dev/metroscope-modeling-library/pull/265))
  - Fixed `NTU HX` test configuration name for `shell_and_tubes` test, [PR #239](https://github.com/Metroscope-dev/metroscope-modeling-library/pull/239)

MetroscopeModelingLibrary/Partial/Machines/Pump.mo

@@ -37,7 +37,7 @@ partial model Pump
         extent={{-20,-20},{20,20}},
         rotation=90,
         origin={0,-120})));
-  Power.Connectors.Inlet C_power "Electrical alimentation of the pump" annotation (Placement(transformation(
+  Power.Connectors.Inlet C_power(not_used = 0) "Electrical alimentation of the pump" annotation (Placement(transformation(
         extent={{-12,-12},{12,12}},
         rotation=-90,
         origin={0,108}), iconTransformation(

MetroscopeModelingLibrary/Power/BoundaryConditions/Sink.mo

@@ -1,9 +1,10 @@
 within MetroscopeModelingLibrary.Power.BoundaryConditions;
 model Sink
   extends MetroscopeModelingLibrary.Icons.BoundaryConditions.PowerSinkIcon;
+  import MetroscopeModelingLibrary.Units.Inputs;
 
   Units.PositivePower W_in;
-  Connectors.Inlet C_in annotation (Placement(transformation(extent={{-60,-10},{-40,10}}), iconTransformation(extent={{-60,-10},{-40,10}})));
+  Connectors.Inlet C_in(not_used = 0) annotation (Placement(transformation(extent={{-60,-10},{-40,10}}), iconTransformation(extent={{-60,-10},{-40,10}})));
 equation
   W_in = C_in.W;
 end Sink;

MetroscopeModelingLibrary/Power/BoundaryConditions/Source.mo

@@ -1,9 +1,11 @@
 within MetroscopeModelingLibrary.Power.BoundaryConditions;
 model Source
   extends MetroscopeModelingLibrary.Icons.BoundaryConditions.PowerSourceIcon;
+  import MetroscopeModelingLibrary.Units.Inputs;
 
+  Inputs.InputNotUsed not_used; // To keep local balance of the Power.Sink, since we cannot define 'not_used = 0' here
   Units.NegativePower W_out;
-  Connectors.Outlet C_out annotation (Placement(transformation(extent={{38,-10},{58,10}}), iconTransformation(extent={{38,-10},{58,10}})));
+  Connectors.Outlet C_out(not_used = not_used) annotation (Placement(transformation(extent={{38,-10},{58,10}}), iconTransformation(extent={{38,-10},{58,10}})));
 equation
   W_out = C_out.W;
 end Source;

MetroscopeModelingLibrary/Power/Connectors/Inlet.mo

@@ -4,4 +4,5 @@ connector Inlet
   import MetroscopeModelingLibrary.Units;
 
   flow Units.PositivePower W;
+  Units.NotUsed not_used "not used effort variable to balance the connector";
 end Inlet;

MetroscopeModelingLibrary/Power/Connectors/Outlet.mo

@@ -4,4 +4,5 @@ connector Outlet
   import MetroscopeModelingLibrary.Units;
 
   flow Units.NegativePower W;
+  Units.NotUsed not_used "not used effort variable to balance the connector";
 end Outlet;

MetroscopeModelingLibrary/Power/Machines/Generator.mo

@@ -7,7 +7,7 @@ model Generator
   Units.NegativePower W_elec "Electrical power produced by the generator";
   Units.PositivePower W_mech "Mechanical power received by the generator";
 
-  Connectors.Inlet C_in annotation (Placement(transformation(extent={{-72,-10},{-52,10}}), iconTransformation(extent={{-72,-10},{-52,10}})));
+  Connectors.Inlet C_in(not_used = 0) annotation (Placement(transformation(extent={{-72,-10},{-52,10}}), iconTransformation(extent={{-72,-10},{-52,10}})));
   Connectors.Outlet C_out annotation (Placement(transformation(extent={{60,-10},{80,10}}), iconTransformation(extent={{60,-10},{80,10}})));
 equation
   W_mech = C_in.W;

MetroscopeModelingLibrary/Sensors/Power/PowerSensor.mo

@@ -7,7 +7,7 @@ model PowerSensor
   Units.Power W;  // Power in W
   Real W_MW(min=0, nominal=100, start=100); // Power in MW
 
-  MetroscopeModelingLibrary.Power.Connectors.Inlet C_in annotation (Placement(transformation(extent={{-110,-10},{-90,10}}), iconTransformation(extent={{-110,-10},{-90,10}})));
+  MetroscopeModelingLibrary.Power.Connectors.Inlet C_in(not_used = 0) annotation (Placement(transformation(extent={{-110,-10},{-90,10}}), iconTransformation(extent={{-110,-10},{-90,10}})));
   MetroscopeModelingLibrary.Power.Connectors.Outlet C_out annotation (Placement(transformation(extent={{88,-10},{108,10}}), iconTransformation(extent={{88,-10},{108,10}})));
 equation
   // Conservation of power

MetroscopeModelingLibrary/Units/Inputs/InputNotUsed.mo

@@ -0,0 +1,2 @@
+within MetroscopeModelingLibrary.Units.Inputs;
+connector InputNotUsed = input Units.NotUsed;

MetroscopeModelingLibrary/Units/Inputs/package.order

@@ -27,3 +27,4 @@ InputPositiveVolumeFlowRate
 InputNegativeVolumeFlowRate
 InputTemperature
 InputYield
+InputNotUsed

MetroscopeModelingLibrary/Units/NotUsed.mo

@@ -0,0 +1,2 @@
+within MetroscopeModelingLibrary.Units;
+type NotUsed = Real  "For Non used variables, needed in power connector for local balance";

MetroscopeModelingLibrary/Units/package.order

@@ -32,3 +32,4 @@ VolumeFlowRate
 PositiveVolumeFlowRate
 NegativeVolumeFlowRate
 Yield
+NotUsed