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

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

cheema gravatar image

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!

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

perolofl gravatar image

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

Check parameter Pmin in REECA1.

perolofl gravatar imageperolofl ( 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 gravatar imagecheema ( 2020-07-01 09:15:38 -0500 )edit

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

Seen: 132 times

Last updated: Jun 23