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Return to Dynamics terminated--system model requires too many

asked 2017-01-23 23:57:55 -0500

Youim gravatar image

I am new to PSSE so I am starting with savnw.sav and modify savnw.dyr to get familiar with it before moving to a 250-bus network. I am trying to add composite load models (CMLDBLU1) to three load buses. But, I get an error saying "Return to Dynamics terminated--system model requires too many." The dynamic simulation runs fine after getting this error. Is it something I need to be aware of? Can anyone help me to remove this error?

Below is the output I get after loading .dyr file:

Generator models use:

CONS 1- 82 STATES 1- 35

Excitation System models use:

CONS 83- 144 STATES 36- 53 VARS 1- 3

Turbine Governor models use:

CONS 145- 177 STATES 54- 63 VARS 4- 8

Shared Load Characteristic models use:

CONS 178- 573

Return to Dynamics terminated--system model requires too many Unshared Load models use:

STATES 64- 144 VARS 9- 300 ICONS 1- 96

SUMMARY OF MODELS READ:

GENS: GENROU GENSAL 5 1

EXSYS: IEEET1 SCRX SEXS 3 1 2

GOVS: TGOV1 HYGOV 3 1

USER: USRLOD 3

NEXT AVAILABLE ADDRESSES ARE: CON STATE VAR ICON 574 145 301 97

Compile models not supplied by PSS/E and create user dll

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answered 2017-01-24 08:36:36 -0500

jconto gravatar image

what version of PSSe are you using? Does the setup run OK without load modeling? can you post the dyr file?

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I am using version 34. The setup runs fines, and I have no issue adding a composite load model to one bus. But, I get the "Dynamic Terminated" error when I add the load model to three buses. Is it because of the limit numbers of CONs for version 34? Thanks!

Youim gravatar imageYouim ( 2017-01-24 11:04:28 -0500 )edit

it would not be a limit on the # of CONs, since your test system is small. Post your dyr data if allow.

jconto gravatar imagejconto ( 2017-01-24 12:03:48 -0500 )edit

I am not sure if I am allowed to share dyr data online. Anyway, I tried my dyr file on version 33 today and I didn't get "Dynamic Terminated" error so there may be some limitation of version 34. But, I run into another issue which I get NaN for all of my outputs. Thank you for your help, jconto!

Youim gravatar imageYouim ( 2017-01-24 21:15:57 -0500 )edit

NaN error are due to bad initialization of the (untuned) load model. Add the model one load model at a time, noting monitoring values reaction to it (channels). Perform a no-disturbance test at every try, you should get flat lines on all channels. Search for NERC LMTF.

jconto gravatar imagejconto ( 2017-01-25 08:31:23 -0500 )edit

I have a similar problem... You wrote it is related to the untuned load model, however, how do I tune the load model then? searching for NERC LMTF did unfortunately not help with finding anything on this...

johnny gravatar imagejohnny ( 2017-05-19 04:20:13 -0500 )edit

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Asked: 2017-01-23 23:57:55 -0500

Seen: 557 times

Last updated: Jan 24 '17