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Transformer Model - Dynamic Model - V36

asked 2026-02-10 19:23:13 -0600

haveityourwa gravatar image

updated 2026-02-10 19:29:44 -0600

Hey All, In previous versions of PSSE I have been able to have a dynamic voltage setpoint to an OLTC1T, by doing a change to the VMAX and VMIN during dynamic simulations, essentially the UDM would do the following.

CALL PFMODE(IERR)
CALL TWO_WINDING_CHNG_6(TRN_BUS_1, TRN_BUS_2, TRN_ID, T_W_INTGAR,T_W_REALAR,T_W_RATINGS,CDEF,CDEF,IERR)
CALL DSMODE(FALSE, IERR)

Which no longer seems possible in PSSE V36 presumably because of the VIND modelling changes. I am trying instead to make a complete tap changer model, and I am getting a bit stuck with the double-entry branch index. I Can run GETFTC which takes in the branch "double" array index. But I can't seem to use the GETKNUM function that uses the double-entry branch index. Ultimately I just wanted to be able to SETVMAX during dynamics but there is no setter for this, I would like to be able to run the function GETVMAX, GETNTAPPOS etc. however these take in the branch array index which up until now I have not been able to find in version 36 of the model. Any help or guidance would be greatly appreciated.

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answered 2026-02-11 21:11:16 -0600

haveityourwa gravatar image

The New API seems to mix up some of the input indexes,

NT = ABS(GET_TAPNO(GET_KNUM(KM))

Is the index needed to access the transformer tap positions, this is indicated as the branch array index, but it must be something else like the tap array index. @perolofl answer on https://psspy.org/psse-help-forum/que..., had the correct solution, however I read over it too quickly and missed the TAPNO call which the explaination for which is a bit confusing in the current version. If anyone is still able to let me know if the PFMODE and DSMODE can still be used in V36 that would be appreciated.

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Asked: 2026-02-10 19:23:13 -0600

Seen: 116 times

Last updated: Feb 11