GGOV1 model can I switch from droop to isoc mode in the simulation
Can I switch from droop to isoc mode during simulation to do frequency control. I change the reselect value from 1 to 0 but it is not controlling the frequency
3 answers
Workaround works many thanks
Comments
After some testing I found that it works if Gref is set to 0 when control mode is set to isochronous mode:
psspy.change_plmod_icon(ibus,id,r"""GGOV1""",1,0) # isochronous mode
psspy.change_gref((ibus,id,0.0) # Greg to 0
I can't say I know much about GGOV1, but you can change the Rselect or any other ICON with BATCHANGEPLMODICON.
PASSTHRU
BAT_CHANGE_PLMOD_ICON,<busno>,'<unitID>','GGOV1',1,0
FIN
will change RSELECT to '0' inside a PSAS file.
Comments
It should work; the speed circuit should always be active and working regardless of rselect. The only other thing I would try is to set R=0 (or something small) in the psas file if possible. This should logically do the same thing. Please post if you figure it out.
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Asked: 2023-03-21 09:52:25 -0500
Seen: 2,825 times
Last updated: Apr 18 '23
It seems it is not possible to switch control mode during a simulation.
Change VAR L - Load Reference to 1.0 at the same time when you make ICON RSELECT = 0 to enable ISOCH mode. This should regulate the speed to 1.0 pu.
@MODELGUY. Wrong, it doesn’t work when changing VAR(L). See my answer April 17. Also, the reference shall be 0, not 1!
@perolofi. Gref is governor reference, which is generic term applicable for all governor models. In case of GGOV1 model, the Gref should be same as Var L which is Pref signal shown in the block diagram. When droop is zero, Speed = Pref and logically to drive speed to 1.0pu, Pref should be 1.0pu.
@MODELGUY. In mode 2 the model uses Gref and not VAR(L). You have completely missed that at nominal speed the pu speed deviation is 0. Thereby, Pref shall be 0, not 1. 1 pu speed deviation means 1 pu overspeed, i.e. 100 or 120 Hz.