setParameters of ModelicaSystem has no effect on simulation

[anonymous]

Hi,
I'm trying to run the PowerWorld example from the PowerSystems library via OMPython.
No errors occur and the simulation itself works. The solutions are correct compared to the ones of OMEdit. However I run into problems when manipulating the parameters:

from OMPython import ModelicaSystem


mod = ModelicaSystem('/home/XXX/PowerSystems/package.mo', "PowerSystems.Examples.PowerWorld.PowerWorld",
                     ["Modelica"])
mod.setParameters(**{'windFarm.cut_out': 1.0})
mod.simulate()
print(mod.getParameters().get('windFarm.cut_out'))#prints out 1.0
frequ_sols = mod.getSolutions('frequency.y')
print(frequ_sols)#solutions are for windFarm.cut_out=0.0 :(

windFarm.cut_out has the default value 0.0. I set windFarm.cut_out to 1.0. No error occurs. I start the simulation.
The solutions (checked with the help of frequ_sols) are incorrect. The solutions are still the solutions of the default value.

I don't see any mistake on my side or hint in the doc that could help me.

[nytsch@…]

Hi,
I had a similar problem with the mod.setParameters() method:

from OMPython import ModelicaSystem

mod=ModelicaSystem("WallModels.mo","WallModels.WallWDVS",["Modelica","BuildingSystems"])
mod.setParameters(["wall.constructionData.thickness[1]=0.24),
                   "wall.constructionData.thickness[2]=0.1),
                   "wall.constructionData.thickness[3]=0.01",                    
                   "ambience.TAirRefSou=BuildingSystems.Buildings.Types.DataSource.Parameter",
                   "ambience.TAirRef_constant=263.15"])

The parametrization of Real values (code above) works fine, but the parametrization of a parameter with types fails (that means the default value BuildingSystems.Buildings.Types.DataSource.File is used instead of the wished value BuildingSystems.Buildings.Types.DataSource.Parameter):

mod.setParameters(["ambience.xAirSou=BuildingSystems.Buildings.Types.DataSource.Parameter",
                   "ambience.IrrDirHorSou=BuildingSystems.Buildings.Types.DataSource.Parameter",
                   "ambience.IrrDifHorSou=BuildingSystems.Buildings.Types.DataSource.Parameter",
                   "ambience.vWindRefSou=BuildingSystems.Buildings.Types.DataSource.Parameter"])

OpenModelica in principle is able to do this kind of parametrization, because this models works fine:

...    
BuildingSystems.Buildings.Ambience ambience(
      TAirRefSou=BuildingSystems.Buildings.Types.DataSource.Parameter,
      TAirRef_constant=263.15,
      xAirSou=BuildingSystems.Buildings.Types.DataSource.Parameter,
      IrrDirHorSou=BuildingSystems.Buildings.Types.DataSource.Parameter,
      IrrDifHorSou=BuildingSystems.Buildings.Types.DataSource.Parameter,
      vWindRefSou=BuildingSystems.Buildings.Types.DataSource.Parameter,	
      ...);

So I guess the Python interface of OpenModelica has an bug (The Ambience model class of the example can be find under ​https://github.com/UdK-VPT/BuildingSystems/blob/master/BuildingSystems/Buildings/Ambience.mo).

I did my tests with the official release 1.14.1 and with 1.15.0-dev.

Christoph

[Christoph Nytsch-Geusen <nytsch@…>]

sorry, my first code example wasn't correct, the correct form is

from OMPython import ModelicaSystem

mod=ModelicaSystem("WallModels.mo","WallModels.WallWDVS",["Modelica","BuildingSystems"])
mod.setParameters(["wall.constructionData.thickness[1]=0.24",
                   "wall.constructionData.thickness[2]=0.1",
                   "wall.constructionData.thickness[3]=0.01",                    
                   "ambience.TAirRef_constant=263.15"])