About LCFB1

angelonso
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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.

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.
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!

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answered Feb 22 '2

angelonso
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updated Mar 20 '2

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.

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answered Feb 21 '2

perolofl

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updated Feb 22 '2

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.

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Thank you very much for your answer! :)

angelonso (Feb 21 '2)

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 (Feb 22 '2)

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 (Feb 22 '2)

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