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I have solved the problem by changing IT from 2 to 0.

I write a user-written model, specifically a CCT type user-written model. dyr data is like：

6 'USRBRN' 9 '2 ' 'MESBRN' 301 2 0 0 0 20 /

And the Fortran code is like：

subroutine mesbrn(km, islot)
......
    return
end subroutine

When I load the dll and run the simulation, there is always a message saying:

 CCT TYPE USER DEFINED MODEL "
 TO BUS      9 [BUS__6__    230.00] CKT 2  NOT ACCESSIBLE

CAN SOMEONE HELP ME TO SOLVE THE PROBLEM. THANKS.

thanks for the answer!!!

When I develop a user-written model for metering and calculating the current of a branch, I need to fill a set of parameters to identify the branch with from bus, to bus and circuit id. The parameter circuit id is in the form of a two- character string. When I debug the dll, I find the ICON is 0. How to get the character from ICON? May someone help.

Very grateful for the answer !! In fact I had studied the REGC_A model of WECC before. There is an accel factor in the GE realization which is used in the process of numerical calculation and there is a block diagram. It will be more grateful if you can help to find a block diagram of PSSE version.

Among the CON parameters in the REGCAU1 model, there is an ACCEL parameter that I have not found a specific description for its meaning and usage. Hope someone help

Does anyone encounter the error "library not found 004054" when loading a user defined model in psse 33.4 ?