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2019-03-22 05:35:18 -0500 commented question Hi guys, How do i activate a python.exe file to run externally PSSe?

My advice is to create an executable that uses the python libraries but not PSS/E. If that executable works correctly, then you know that the problem is with PSS/E.

2019-03-22 03:33:53 -0500 commented question Hi guys, How do i activate a python.exe file to run externally PSSe?

Python code that calls PSS/E will not execute on a computer that does not have a licensed version of PSS/E installed.

2019-03-16 06:33:31 -0500 answered a question INITIAL CONDITIONS SUSPECT: MODEL GENSAL STATE K

There could be any number of reasons for this. It is almost impossible for anyone to diagnose this problem without seeing the PSS/E files that caused the problem (SAV, DYR etc.)

2019-03-08 07:49:28 -0500 answered a question Uresolved external symbol error when compiling an UDM

If you're using v33+ then I'd recommend that you write a CCT model instead of a CONET model. They are much more convenient.

2019-03-06 08:09:01 -0500 answered a question Compile PSSE 32

There should be no need to modify the contents of the "compile.bat" (or "compilar.bat") file that is automatically generated by PSS/E as part of the DRYE function. If you are getting compile errors then these errors are in the Fortran code of your user-defined model.

2019-03-06 04:13:12 -0500 answered a question LCC HVDC PSS/E Modelling

"Plan A" for you should be to use one of the built-in generic models provided in the PSS/E library. I have used the CHIGATT model before and its performance agreed very well with a custom model built by a HVDC manufacturer. "Plan B" is to write your own model, which is a much more complex exercise. My advice is to stick with "Plan A" unless you have a very specific reason why you need to write your own model ("Plan B").

2019-03-05 05:46:01 -0500 commented answer How to ramp the value of exciter output voltage in dynamic simulation?

I was thinking about a ramp to the voltage setpoint. A ramp to the EFD would require a user model (either CONEC, CCT (v33+) or Exciter model).

2019-03-05 04:12:25 -0500 answered a question How to ramp the value of exciter output voltage in dynamic simulation?

You can also implement the ramp in Python code, running one simulation step at a time in a while loop, changing the value of the ramp signal as you iterate. Not the most elegant solution, but effective nonetheless.

2019-03-05 03:14:19 -0500 answered a question Sequence data for the IEEE 118 network or other network

I've looked at a few websites that are hosting IEEE network data, but I can only see RAW files. I don't see any SEQ files. Try to trace back to the original source of this IEEE RAW data; it is quite possible that SEQ files associated with these RAW files were never published.

2019-03-05 02:44:52 -0500 commented answer How to convert PSCAD model to PSS/E model ?

I would say that the most effective way to model an N-terminal VSC-HVDC system is to use N separate synchronous generators in power flow. Then, in a dynamic simulation, you will need to write a model with those N generators "talking" to each other.

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2019-03-04 06:24:58 -0500 commented answer How to convert PSCAD model to PSS/E model ?

Your first option should be to try to use the built-in PSS/E model "HVDCPL1", for which you do not need any external compiler or capability to write user-defined models. Purchasing a compiler and learning to write your own models is a significant money&time investment.

2019-03-01 09:31:48 -0500 commented answer Getting y matrix through conet crashes pss e

It should be possible to get the Ybus through a user model, but you will have to write, test and debug this model to get it working (whether you write it as a CONEC model or something else). That seems like a lot of work when you can achieve the same objective using Python coding.

2019-02-28 02:56:38 -0500 answered a question Getting y matrix through conet crashes pss e

I agree that Python is the easier way to get what you want.

The following is a lot more work, but it might be a preferred option for you, if you want to avoid writing/using Python code for every simulation. You could also consider writing a CCT model instead of a CONEC model. This is a v33+ feature. This type of model can be written as a DLL with the functionality that you want, and unlike a CONEC model it does not have to be compiled at run time. I'd advise you to get your CONEC code working correctly before you try to convert it to a CCT model.

Happy coding!

2019-02-26 01:52:02 -0500 commented question psse ver 33 activation string

I had a similar issue. You need to contact Siemens PTI, and they will ask you to verify your identity before they provide you with the activation strings.

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2019-02-21 06:00:57 -0500 commented answer Array UMDNAM

Thanks for the tip, it led me to find out the problem with my source code!

2019-02-20 05:38:00 -0500 asked a question Array UMDNAM

Hello all,

The PSS/E array UMDNAM contains 6-character names of user-defined generator dynamic models (USRMDLs). The latest versions of PSS/E allow for USRMDLs that have names longer than 6 characters. Does anyone know the name of the array that contains the longer names of the USRMDLs for generators?


2019-02-20 02:25:02 -0500 commented question How to calculate the governor reference?

You need to state your problem more clearly, with less ambiguity, and with more specific details. Then I am sure that some of the people with the relevant expertise who visit this site will be able to help you.

2019-01-21 10:22:10 -0500 answered a question ImportError: No module named psspy

Do a quick sanity check. Open PSSE explore, and then type

import psspy

into the Python command line. If you don't get an error message in the Output Bar, then there's some problem linking everything up externally.

2019-01-21 08:59:20 -0500 answered a question How to convert PSCAD model to PSS/E model ?

In PSS/E, there is the HVDCPL1 model, based on Siemens HVDC Plus technology, which is MMC-HVDC.

This model is available in v34.2 of PSS/E; I can't confirm if it is in earlier versions.

Your challenge is to fit your PSCAD model to the HVDCPL1 model parameters - caveat utilitor!

2019-01-18 02:12:56 -0500 commented answer Help with compiling FORTRAN Models

Use IF(MIDTRM) RETURN and remove all references to the DLTCHG parameter, and your model should compile and run correctly in dynamic simulations in v33.

2019-01-16 02:19:28 -0500 commented answer Help with compiling FORTRAN Models

As far as I am aware, DLTCHG is only relevant for extended term simulations. You should be able to use a statement like IF(MIDTRM) RETURN to avoid extended term simulations, which you are most likely not interested in. User-defined modelling is not very well documented in PSSE.

2019-01-15 11:36:55 -0500 answered a question Help with compiling FORTRAN Models

DLTCHG is the flag for a variable step size in an extended term simulation. The line of code that you posted is saying that the model execution should end if you select extended term simulation mode with a fixed time step. Are you intending to use extended term simulation mode with a variable time step? That would be MIDTRM=1 and DLTCHG=1. If not, then you can remove all references to DLTCHG in your code, and try a compile in v33. You won't lose any relevant functionality.

2018-12-21 02:10:32 -0500 commented question PV and WTG Step Change

Why don't you try that and find out if it works?

2018-12-19 10:51:39 -0500 answered a question PSSE, python, dynamic run

Look in the PSSE "Example Directory", which on my PC is here.

C:\Program Files (x86)\PTI\PSSE34\EXAMPLE

The "" file shows you the code for running PSSE simulations from Python and plotting results.

That and the PSSE API manual should give you a head start.

2018-12-13 02:24:38 -0500 commented question UDM with vars and states equal to zero during dynamic simulation

It's very difficult to debug code without actually seeing the code!

2018-12-10 07:21:28 -0500 answered a question .sav file with psse34

I presume you are talking about the *.sav file format? There are several versions of PSSE34, and the files might not be backwards compatible. For example. if you have v34.2 installed, and someone gives you a sav file that was created using v34.4, then you might not be able to open it. I would advise you to "go back to the source" and find out what version of PSSE was used to create the sav file that you cannot open.

2018-12-05 11:35:17 -0500 commented answer IEEE 118 Bus System in PSSE Try again. This is a once-off download, then the online file is deleted.

2018-12-05 03:52:23 -0500 commented answer IEEE 118 Bus System in PSSE

I found a v33 RAW file at the University of Illinois website. I converted this to v32, and you can download that from here.

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2018-12-03 09:01:56 -0500 answered a question IEEE 118 Bus System in PSSE

If you post the RAW file here then I can import it into PSSE and then export it to v32 format, and post that for you.

2018-11-23 10:56:22 -0500 commented question PLBVFU1 Playback model

I was assuming that it was available in v33, based on the original question. Clearly that was incorrect.

2018-11-23 04:21:04 -0500 answered a question Prony Analysis

As far as I am aware, there is no built-in Prony analysis tool in PSSE. You can use Python to extract the results from a dynamic simulation. Then, you can either search for and download a Python package that does Prony analysis, or write the Python code yourself.

2018-11-23 04:14:15 -0500 commented question PLBVFU1 Playback model

I don't have v34.0.0 installed, but PLBVFU1 is available in 34.2.0 and 34.3.1, and you say that it is available in v33, so I would be surprised if it is not available in v34.0.0.

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2018-10-26 01:40:49 -0500 answered a question Plotting a CON Parameter

Thanks for your help, I got it working.

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2018-10-22 07:45:38 -0500 commented question Overwriting OUTX Files

Version 34.2.0

2018-10-21 03:36:44 -0500 asked a question Overwriting OUTX Files

Hello All,

I am using PSSE Dyanmics. I have run a simulation, and there is an OUTX file in memory ("V Change 5.outx").

When I try to repeat the simulation, I get this message in the Output Bar.

Insufficient access rights. V Change 5.outx (OpnApplFil/LOPEN)

This message seems to say that I do not have permission to overwrite the contents of the OUTX file, but when I run the simulation the contents of the OUTX file are overwritten, as I can see new/different simulation results in the overwritten file. Note that I have also implemented the following command. ierr = psspy.file_overwrite(1)

I don't know why PSS/E is showing this warning message about insufficient access rights. Does anyone have any thoughts?


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2018-10-21 03:31:04 -0500 commented question Plotting a CON Parameter

Yes, I do have a FORTRAN compiler. What do you suggest? Thanks.

2018-10-19 11:00:04 -0500 asked a question Plotting a CON Parameter

Hello All,

Here's the situation.

With a USRMDL of a STATCOM that I am using (but did not write and do not have the source code for) the voltage setpoint of the STATCOM is a CON parameter. I make changes to this CON parameter and see the response of the STATCOM. I want to plot the STATCOM voltage and the reference voltage on the same graph, to show how the voltage follows the changes in setpoint. However, it seems that I cannot plot the CON parameter. Does anyone know a workaround?

I would like to ask the model writer to include the CON parameter as a VAR, so that I can plot it that way, but this might not happen any time soon.

Perhaps some of you have faced a similar situation. I would appreciate your replies. Thanks.

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2018-09-14 12:12:16 -0500 asked a question Function in excelpy to get the name of a worksheet

Hello readers,

I'm trying to find a function in excelpy that will return the name of a worksheet. I don't think there is one, but please correct me if I am wrong.

I do know that such a function exists in the openpyxl module, but I would prefer to use excelpy if possible.


2018-09-10 07:56:09 -0500 commented answer excelpy reading excel files

I have not used xlrd, but it seems that you can't use it to write data to an Excel file. I have used openpyxl, and it lets you read from and write to Excel. The online Help for openpyxl can be tricky to navigate though.