Ask Your Question

NEVA - PSS/E - Eigenvalue analysis

asked 2015-01-14 02:36:39 -0500

Javier gravatar image


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.


edit retag flag offensive close merge delete


Correct me if I am wrong, but you need to pay more to have appropriate license to be able to use NEVA.

Cao Huy gravatar imageCao Huy ( 2015-01-14 03:09:16 -0500 )edit

Yes. NEVA licence is sold separately.

Mahesh gravatar imageMahesh ( 2015-01-14 06:03:28 -0500 )edit

Hello! How can i get NEVA ?

Emely gravatar imageEmely ( 2020-06-12 17:14:46 -0500 )edit

2 answers

Sort by ยป oldest newest most voted

answered 2015-01-14 06:08:13 -0500

Mahesh gravatar image

updated 2015-01-14 23:25:13 -0500


I think you are loading only ".sav" file and trying to run NEVA.

Load both .sav and .dyr files. Then the option is enabled and you can perform eigenvalue analysis.

There could be two things then. 1.Check if your file has errors. This will be reflected in progress window. (one of my 2 terminal dc model was wrong, there neva could not launch.) 2.Check if installation is correct. Try opening neva directly using icon in programs.

Also try savnw.sav and .dyr files from example folder in psse installation for NEVA analysis

edit flag offensive delete link more


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.

Javier gravatar imageJavier ( 2015-01-14 10:07:43 -0500 )edit

I haven't used NEVA, but with my experience with LYSANS, I think you should do ASTR activity before run NEVA.

Cao Huy gravatar imageCao Huy ( 2015-01-14 20:28:21 -0500 )edit

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.

Javier gravatar imageJavier ( 2015-01-15 02:30:11 -0500 )edit

I am using LSYSAN (PSSE 29) to calculate eigenvalues, eigenvector and check small signal stability. Since NEVA and LSYSAN do the same job, I thought that maybe NEVA is an upgrade version of LSYSAN.

Cao Huy gravatar imageCao Huy ( 2015-01-15 04:20:46 -0500 )edit

Have you done those activities "CONG", "CONL", "ORDR", "FACT", TYSL before run ASTR? After all, ASTR is an dynamic activity. In PSSE 33, I am able to run ASTR without NEVA and LSYSAN license.

Cao Huy gravatar imageCao Huy ( 2015-01-15 04:31:14 -0500 )edit

answered 2020-06-11 08:11:52 -0500

Emely gravatar image


I'm trying to make a small signal stability analysis in PSS E. I have already open the .sav and .dyr file, . I executed the power flow but when i execute the "launch eigenvalue analysis appears this error:

UnboundLocalError: local variable 'strValue' referenced before assignment

There may have been an issue running Python file:C:\Program Files (x86)\PTI\PSSEXplore34\PSSBIN\

I need your help.

edit flag offensive delete link more


Do you have python 2.7 installed? If not, try installing and the "There may have been an issue running Python file..." issue may be fixed. gravatar ( 2020-07-14 08:30:40 -0500 )edit

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Add Answer

[hide preview]

Question Tools


Asked: 2015-01-14 02:36:39 -0500

Seen: 1,705 times

Last updated: Jun 11