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

asked 2020-06-20 08:54:30 -0600

cheema
1 ●7 ●9 ●8

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!

answered 2020-06-23 04:41:30 -0600

perolofl

3322 ●1 ●8 ●18

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).

edit flag offensive delete link

Comments

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 -0600 )edit

Check parameter Pmin in REECA1.

perolofl ( 2020-06-29 06:38:31 -0600 )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 -0600 )edit

add a comment

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

1 answer

Comments

Your Answer

Question Tools

Stats

Related questions