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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
Workaround works many thanks
Can you please select the answer that worked for others to know how to fix this?
He is referring to my answer.
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 0I 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
FINwill change RSELECT to '0' inside a PSAS file.
Yes, you can change the ICON, but the model does not handle the change correctly... :-)
Does it work if it's initialized in ISOC mode?
Yes, but it is not behaving correctly when changing mode during the simulation.
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.
Asked: Mar 21 '3
Seen: 2,866 times
Last updated: Apr 18 '23
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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.