Change the voltage reference in REGCA1 and REECA1 model during dynamic simulation

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Hi, Does anyone know how to change the voltage reference for REECA1 and REGCA1 models in PSSE 34.0.1? "Change V_ref" command doesn't work as that is not for renewable it seems like. I tried changing variable 5 (L - Bus reference voltage (Vref0)) during the simulation but it didn't do anything:

psspy.run(0, 5.0,1,1,0) #run for 5 seconds psspy.changevar(5,0.5) #change vref to 0.5 psspy.run(0, 6.0,1,1,0) #run to 6 seconds

I am trying to the step response by changing the voltage and power reference internal to the REECA1 and REGCA1 at 5 seconds in model instead of using a playback model. Any suggestion will be helpful. Thanks!

cheema

asked 2020-06-20 08:54:30 -0500

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A voltage step test can be done by changing VAR(L+3) in REECA1 model, if QFLAG=1 and VFLAG=0.

The calculated bias is 0 if PFFLAG=0 and it is Vinitial if PFFLAG=1. Update the value during the simulation with the wanted voltage step change.

Example 1: Step change 5%, PFFLAG=0; Change VAR(L+3) to 0.05

Example 2: Step change 5%, PFFLAG=1; Vinitial = 1.01; Change VAR(L+3) to 1.06

You need to use a plant controller, e.g. REPCA1, to make a step change in active power (Pref) or reactive power (Qref).

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perolofl

answered 2020-06-23 04:41:30 -0500

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Thank you Perolofl! Bias works in REECA1. One more question on Pref for REPCA1, when I step change the Pref of the plant, it doesn't exactly follow the Pref. I was running the plant at 80 MW and changed Pref to 0 MW at 10 sec, but the plant output settled at around 45 MW, any idea why?

cheema (2020-06-27 10:37:01 -0500) edit

Check parameter Pmin in REECA1.

perolofl (2020-06-29 06:38:31 -0500) edit

Thanks once again perolofl! I realized that the grid's inertia wasn't set to infinite (H=0) and the frequency of the grid was dropping a little bit which was causing the droop characteristics of REPCA1 model to kick in. I changed H to 0 for GENCLS and it is tracking the Pref setpoint now. Thank you

cheema (2020-07-01 09:15:38 -0500) edit

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Could you tell me the exact process of "change the voltage reference in REGCA1 and REECA1 model during dynamic simulation"? how to perform "Change VAR(L+3) to 0.05 at 5sec"?

Ben

answered 2025-08-25 20:38:43 -0500, updated 2025-08-25 20:40:10 -0500

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Run to 5 s and use API: psspy.change_wnmod_var(ibus,id,r"""REECA1""",4,0.05)

perolofl (2025-08-26 03:47:23 -0500) edit

Thanks a lot!!

Ben (2025-09-03 04:06:33 -0500) edit

I set REGCA1 and REECA1 and REPCA1. I try to change V_ref in Var #1 of REPCA1. But It doesn't work. How to solve? # t = 5.0 s : Vref → 1.20 [pu] psspy.change_wnmod_var(70101, '1', "REPCA1", 1, 1.20) But the signal performace dosn't follow V_ref.

Ben (2025-09-03 04:11:54 -0500) edit

Is RefFlag = 1?

perolofl (2025-09-03 08:25:10 -0500) edit

Yes. RefFlag = 1. --> ICON, M+5 : Index Value M 70102 M+1 70102 M+2 97000 M+3 1 M+4 0 M+5 1 M+6 1

Ben (2025-09-03 09:09:02 -0500) edit

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