Javier's profile - activity

Hello,

I'm running a Python code in which I call PSSE/E to solve a power flow. I would like to obtain all the bus variables of the grid: Voltages, angles, active power and reactive power. One way is using a "for" loop and extract each variable of each bus one-by-one (example, with psspy.busdat(i ,'PU') ). Please, does anyone know if there is another method to obtain the variables of all the buses in a vector form? i.e, I would like to obtain the whole vector at once and do not use loops.

Thank you Javier

installing PSS/E and it was that the paths where not correct. I think that the problem is in the installation or in the compatibility with PSS/E 33.

(1) the ".nid" file is your original PSS/E file converted to NETOMAC-type file. In other words, is the new case, created to be compatible with NEVA. (2) I do not know what is the meaning of the error that you are talking about, it didn't appear to me. Nevertheless, I had some similar problems when

Hello, Sorry the delay. I didn't visit the forum. I'm afraid I do not know how to solve your problem, but I can tell you some tips about my experience with NEVA

Hello:

The procedure to perform small-signal analysis with NEVA-PSS/E is the following:

1. Load ".sav" case.
2. Run a power flow.
3. load the dynamic file ".dyr"
4. Press "Dynamics"->"Launch NEVA Eigenvalue analysis"

Please, note that you do don't have to convert the loads and generators as have to be done in time-domain simulations.

Once this is done, a folder with NEVA files will be created (NETOMAC files). NEVA will start automatically and yo will be able to obtain the eigenvalues of the linearized system. If NEVA does not start, you have to run it yourself and load the ".NID" case, which is in the new folder.

I don't have it in front of me now, but once you have loaded the file in NEVA, is easy, it should appear smth like "modal analysis" or "eigenvalues". If you press that button, the list of the eigenvalues is obtained.

I do not have LYSANS license, but it should be similar ("Dynamics"->"Build matrices for LYSANS program")

javier

thank you very much for your help.

Hello, I solved the problem with the help of PTI support. The problem was that I did the activities "CONG", "CONL", "ORDR", "FACT", TYSL. To perform eigenvalue analysis with NEVA one have to load the .sav case (or .raw) and the dynamic files (.dyr) but you don't have to convert the loads and gens.

I will check why activity ASTR does not work.

I thought that NEVA and LSYSAN were different tools (although they do the same job). But I have never use them, so maybe you're right. About the last thing that you say: can you run ASTR activity without LSYSAN license in PSS/E 33? Because as you suggested, the problem may be there. Thank you very m

Thank you for the post. I have NEVA license but I don't have license for LYSANS module. I can not run ASTR activity because I understand that belongs to LYSANS module (please correct me if I am wrong). Because of this, I'm not sure if one should run ASTR before running NEVA.

Hello, Thank you for your anwers. I have the NEVA license and I am loading ".sav" files and ".dyr" files. So I don't know what could happen.

Hello:

I would like to ask if anyone has experience with NEVA, which is separate PSS/E add-on module to perform small-signal analysis.

I think that I have all correctly installed, but I'm not able to carry out an eigenvalue analysis of an existing PSS/E case. The "Dynamics" tab of PSS/E has the option of "Launch NEVA Eigenvalue analysis", but it appears in grey and I can't use it.

I would like to know the cause of the problem and use NEVA.

Thank you very much.

Javier

Ok, thank you very much. I will study doing what I need using that option.

I am not familiar with the second option that you propose. How do you create a data structure with a VAR in PSS/E? thank you for your help javier

Dear Arjen, Thank you for your answer. It is useful to know that PSS/E does not allow to use variables from previous time steps. It is a pity that those values are not accesible, because they must be in some place internally!!! I will do something similar to your recommendations.

Dear Arjen,

Thank you for your answer. It is useful to know that PSS/E does not allow to use variables from previous time steps. It is a pity that those values are not accesible, because they must be in some place internally!!!

I will do something similar to your recommendations.

I am not familiar with the second option that you propose. How do you create a data structure with a VAR in PSS/E?

thank you for your help

javier

Hello,

Please does anyone know how to obtain the value of the variables in function of time in dynamic simulation?

For example, if I have VAR(L+12) at time "t", i would like to use the value of VAR(L+12) at time "(t-T)" and use it.

One option is to save the variable values at previous time in other variables, but I was wondering if there is a more direct method.

I have not found this information in the user's manual.

thank you. Javier

Ok, thank you for the answer.

Ok, thank you very much for the answer. I didn't know that. Javier

Hello,

I have tried to run the linear-analysis tool of PSS/E (LSYSAN, with activity ASTR) to obtain the state-space matrices of the small-signal model of a system.

Unfortunatelly, it doesn't work and I obtain the message: "Linear system analysis option is not installed". I use PSS/E 32 and I think that has been installed properly, because I followed al the steps and I have ran a lot of dynamic simulations with any problem. Also, I assumed that the Linear Analysis tool was installed automatically with the dynamics.

Please, does anyone have an idea of what could be the problem? (i.e, Why LSYSAN was no installed properly? ) Perhaps to use de Linear Analysis tool you need another license? (But I don't think so).

thank you very much. Javier