Hi Jesus,

Sorry, I wrote the wrong the name for the model, but I have edited the comment now. The steps are then:

1) Find the Modelica.Electrical.Machines.Examples.SynchronousInductionMachines.SMEE_Rectifier model in the class browser in Model Center.

2) Duplicate the model, by clicking it with the right button and selecting Duplicate. A window will open where you can give a name to this new model.

3) Go to the text view of this new model.

4) You'll find the declaration of the component

Modelica.Electrical.Machines.BasicMachines.SynchronousInductionMachines.SM_ElectricalExcited smee(...)

with a lot of modifications, here represented with ... .

5) Add the modification

idq_dr(each fixed = true)

to it, so you should end up with something like

Modelica.Electrical.Machines.BasicMachines.SynchronousInductionMachines.SM_ElectricalExcited smee(... ,  idq_dr(each fixed = true))

6) Simulate, with either Simulation Center or Mathematica, and you'll be able to set initial values for both smee.idq_dr[1] and smee.idq_dr[2].

Dear Jesus,

In this case, if you duplicate the Modelica.Electrical.Machines.Examples.SynchronousInductionMachines.SMEE_Rectifier model and add the modification

idq_dr(each fixed = true)

to the component

    Modelica.Electrical.Machines.BasicMachines.SynchronousInductionMachines.SM_ElectricalExcited smee

then you can provide initial values to both smee.idq_dr[1] and smee.idq_dr[2].

Sergio

No, that is not possible, and there is no guarantee that two different Modelica tools (or two different versions of the same tool) will make the same choice of equations. Actually, there is technically not even a guarantee that there will be a choice at all; one can imagine using integration methods that don't perform reduction to ODE (state-space) form, or ODE forms where the equations used don't have a closed-form relation to the original equations of the model.

Dear Sergio and Henrik, Looking into more complex systems but in the same subject, I have tried this with a SystemModeler example and I am again having trouble at initializing. I thought I understood before, but I did not. Please help.

Ex1 = SystemModel[
  "Modelica.Electrical.Machines.Examples.SynchronousInductionMachines.\
SMEE_Rectifier"]
Ex1["StateVariables", 
 Method -> {"Elimination" -> All, "ReduceIndex" -> True}]
Ex1["StateVariables"]
Ex1["Balanced"]
SystemModelSimulate[Ex1, {0, 1/50}, <|
  "InitialValues" -> {"capacitor1.v" -> 1, "smee.idq_dr[1]" -> 1}|>]

SystemModelSimulate::eva: The variables {smee.idq_dr[1]} are computed from other variables.

Hi Jesus,

In the Mathematica side of your question, I believe you are using the SystemModel property "StateVariables" to find the states. To get a picture consistent with the full kernel action in System Modeler, you can use the Method option

SystemModel[model, "StateVariables", Method -> {"Elimination" -> All, "ReduceIndex" -> True}] 

which returns, for your model, L3.i and c2.v. We created a bug report to clarify the process of state classification further in the Mathematica side. Thanks for your input.

Sergio