search

itesla / ipsl

The iTesla Power System Library is a Modelica library developed as part of the iTesla project. The library contains a set of power system component models for phasor time domain simulations.
Mozilla Public License 2.0
23 stars 71 forks source link

Models LOADPQ/LOADPQ_variation #146

Closed AIAitesla closed 7 years ago

AIAitesla commented 8 years ago

Hi @tinrabuzin,

We are updating a Modelica test system from Eurostag to the last version of the iPSL. In the older version of the library, this test system used the following model:

PowerSystems.Electrical.Loads.PwLoadwithVariation.

We think that the equivalent model in the last library is:

iPSL.Electrical.Loads.PSAT.LOADPQ_Variation.

We have tested the Modelica system from Eurostag with this LOADPQ_Variation but it doesn't work: the simulation stopped as you can see in the image above.

image

Thank you in advance.

tinrabuzin commented 8 years ago

@AIAitesla

I'm not sure that this is the same model as the one from Eurostag. When we were cleaning the library we deleted the ones that were unsorted and duplicates.

But in any case, it seems like there is a problem with something other than the load model, by looking at the figure attached. However, I cannot debug your problems without a test system that you're using. Can I have it?

AIAitesla commented 8 years ago

Hi @tinrabuzin,

we can't attach a Modelica file in the issue, so we will send it to you by e-mail.

The system we will send you is the test system A and the library that you should use is the iPSL in AIAreverse branch. This test system used and simulated with model PowerSystems.Electrical.Loads.PwLoadwithVariation but does not simulate with iPSL.Electrical.Loads.PSAT.LOADPQ_Variation.

In the Modelica file there is the LOADPQ_variation and also (commented) the PwLoadwithVariation with the corresponding parameters. A part from this we also need that the model iPSL.Electrical.Loads.PSAT.LOADPQ will be reviewed because it is the only PQ load (excluding the load from PSSE).

Could you please have a look at these two models?

We also have noticed something it seems to be different in the initial P and Q units. These two models (LOADPQ and LOADPQ_variation) extend from the model baseLoad that extends from model pfComponent where P_0 and Q_0 are defined in MW and MVAr respectively. In the model LOADPQ_variation these two parameters are converted to p.u. but in the model LOADPQ they are in MW and MVAr because Sn and S_b are 100. In the image above you can see these differences.

image

Thank you very much for you help.

tinrabuzin commented 8 years ago

@AIAitesla

Please, have a look at the new LOADPQ model.

tinrabuzin commented 8 years ago

@AIAitesla

Also, I added the Eurostag model that you asked for.

AIAitesla commented 8 years ago

@tinrabuzin we have tested the model :iPSL.Electrical.Loads.PSAT.LOADPQ, with the simple test SystA_iPSL and it does not work. There is not other LoadPQ model available in the iPSL, so we need this model to work. Since, we are updating Eurostag models these models should be in the master and the AIAreverse branch. Please merge them

Thanks

tinrabuzin commented 8 years ago

@AIAitesla I will not merge them. I will just move the Eurostag model to the master branch.

By the way, if I put the Eurostag model back to the library, why do you even care about the PSAT loads? Maybe you should just use the ones that you've developed from Eurostag.

tinrabuzin commented 8 years ago

@AIAitesla In case you didn't know, it is possible to make the PSSE load to be constant power load. Also, your system maybe doesn't work because of the too large disturbance to your system. Try increasing the fault impedance.

AIAitesla commented 8 years ago

Ok, sorry about the merge. It was an error to ask you . We will take care of that!

That was the question. We need to have Load models with PQ constant for Eurostag conversions. We haven't use PSS/E model because the PSAT model seems the more simple and appropriate for this, but if the PSS/E model is the one available for this then we will use it.

tinrabuzin commented 8 years ago

@AIAitesla

As I said, if your system worked before with the Eurostag models and we added it now, it might be smart to just continue using it since there is not a lot of time until the end of the project...

AIAitesla commented 8 years ago

OK.