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About LCFB1

First of all, thank you for your time. I have been trying to implement secondary frequency control in PSSE and I have a couple of doubts that I was hoping you could help me with. My goal is to use TGOV1 and LCFB1 to implement this control, to do this I want to introduce the AGC requirement (that will be externally calculated in Python) to the LCFB1 model.

  1. I would like to know how to change the Pmwset of the LCFB1 model so that I can enter the AGC requirement there but I can't find the python API that does this.
  2. The Pref output from the LCFB1 is automatically introduced as the Pref input of the TGOV1 model or do I have to link it somehow?

Thank you in advance!

angelonso's avatar
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angelonso
asked 2022-02-20 06:22:24 -0500
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I have found it imposible to change de Pmwset value so I belive that the LCFB1 model is nto a good aproach to secondary frequency control via ACE. My recomendation would be to change manually the governor reference of the generators involved in secondary control.

angelonso's avatar
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angelonso
answered 2022-02-22 13:34:13 -0500, updated 2022-03-20 04:37:43 -0500
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1: EDIT: It seems that signal Pmwset cannot be changed during simulation since there is no corresponding VAR. Signal Pref0 is the third VAR in model LCFB1. You can change that value with API plmod_var: Example, update Pref0 for generator 1 at bus 206. Here I change the value to 0.03.

psspy.change_plmod_var(206,'1',r"""LCFB1""",3, 0.03)

A question here is how Pmwset is stored in the model without using a VAR????

2: Yes, the Pref output from LCFB1 is updating the power reference in model TGOV1.

perolofl's avatar
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perolofl
answered 2022-02-21 11:04:05 -0500, updated 2022-02-22 05:05:30 -0500
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Thank you very much for your answer! :)

angelonso's avatar angelonso (2022-02-21 11:11:12 -0500) edit
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Hello, the results that I am getting dont make much sense. Are you sure that this variable is the Pmwset and not Pref0? The results I get seem to indicate that the value I introduce as Pmwset does not go through the integrator part of the LCFB1 controller.

angelonso's avatar angelonso (2022-02-22 03:02:15 -0500) edit
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Sorry, my mistake. I didn't read the block diagram correctly. It seems that it is not possible to change Pmwset since it is not available in a VAR. I will update my answer to be more correct.

perolofl's avatar perolofl (2022-02-22 04:50:35 -0500) edit
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