¿what does it mean the line code INCLUDE COMON4.INS in the PSS/E user written model examples ?? also , what is BADMID?

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There is a manual for using environment manager that should address your questions on how to use that application. It covers the GUI and a great library that can be imported into python and used to automate the process of compiling, linking, and building user DLL's. It has saved me a ton of time creating an automation script for compiling user-defined flecs code.

The manual is located in the "site-packages" directory of your python installation. You should find a manual entitled "PSSE Environment Manager.pdf"

You will have to compile your fortran code using the Environment manager to create a dsusr.dll. What you should do you in open the Environment manager, select the installed PSS/E version and select the place where your fortran files are in your computer. Once you do that, you will need to click compile + create dll. Depending on your code, Environment manager will create a dsusr.dll for you. However, you will have to install Intel Visual Fortran compiler with shell which will compile your fortran code. The easiest way to see if you have the compiler is to create a dsusr.dll from conect.flx and conet.flx which is available in the PSSE example folder in this location c:\programs86\pti\psse\example

The include statement just inserts the code in file comon4.ins into the source code. It contains declaration of variables and common blocks, for example CON, STATE, VAR, EFD, VREF used in the model.

BADMID is only needed if you have the option of extended term simulation, so you can, most probably, forget that function.

You need a Fortran compiler in order to compile and link the source code.