ESAC8B at SMIB unstable system.

asked 2024-02-29 16:19:32 -0500

gabriel_ipu
15 ●5 ●6 ●9

Hi, im trying to simulate am GENSAL or GENSAE (50MW) with two branches at 1 p.u. to an infinite bus. When i try to implement the ESAC8B excitation system, my simulation gets unstable, with the graphs starting to move even before the fault. What can be the problem ?

This is the control that i'm trying to use:

1 'ESAC8B' 1 0.0000 28.500 18.000 3.6600 0.30000E-01 1.0000 0.0000 27.190 0.0000 0.72000 1.0000 1.0000 0.0000 1.2000 0.0000

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answered 2024-03-01 10:36:45 -0500

jconto
2701 ●10 ●30 ●41

I guess in your case the machine model (GENSAL or GENSAE) is not good. The ESAC8B model behaves well in a simple SMIB test (machine at bus 2). Using a GENSAL model from the savnw data set, set inertia at 1.0, I did a flat run then a fault run and the plots came OK. dyr data used:

// smib.dyr
// infinite bus: bus 1
// test machine: bus 2 
1 'GENCLS' 1   8.0  0.01 /
2,'GENSAL',1, 5.0,0.05,0.20,1.0,0.0,1.0,0.75,0.4,0.26,0.10,0.11,0.62,/
//2 'GENROU' 1   6 .05 1 .05 3 0 1.4 1.35 .3 .6 .2 .1 .03 .4 /
//2 'SEXS'   1   .1 .1 100 .1 0 3 /
2 'ESAC8B' 1   0.0 28.5 18.0 3.66 0.3E-01 1.0   0.0 27.19 0.0 0.72 1.0 1.0  0.0  1.2  0.0 /
//2 'TGOV1'  1   .05 .5 1. .3 1. 1. 0. /
//2, 'PSS2A',1, 1,0,3,0,5,1,  2,2,0.02,2,4,2,0.25 ,1,0.5,0.1,30,0.15,0.03,0.15,0.03,0.1,-0.1,/

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I tried to change but it didn't change a lot. Without the ESAC8B model, it works fine, it only has problems when i try to use it at the gen. Can you try to see what i'm doing wrong ? Please, i tried everything https://drive.google.com/drive/folders/1dIksW7PRMwqmJnOCjwsDL8tRE3cieKv0?usp=drive_link%3C/p%3E (https://drive.google.com/drive/folders/1dIksW7PRMwqmJnOCjwsDL8tRE3cieKv0?usp=drive_link)

gabriel_ipu ( 2024-03-01 13:05:56 -0500 )edit

I tried with GENCLS instead of GENSAL and it didn't work aswell

gabriel_ipu ( 2024-03-01 23:09:48 -0500 )edit

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answered 2024-03-04 11:49:15 -0500

perolofl

3312 ●1 ●8 ●18

Channel values moving before the fault indicates initial conditions suspect. Check progress window for messages, e.g. a limiter hitting limits.

Show complete .raw and .dyr files.

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Sure, it is at this google drive link: https://drive.google.com/drive/folders/1s6X6r2QZGPBTHX5sn7QholX2A5UonFJM?usp=sharing%3C/p%3E (https://drive.google.com/drive/folders/1s6X6r2QZGPBTHX5sn7QholX2A5UonFJM?usp=sharing)

gabriel_ipu ( 2024-03-04 17:48:27 -0500 )edit

There is a overflow in raw file for XSORCE for generator at bus 2. It works fine at my side when using XSORCE=1. Everything is stable.