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how to model battery energy storage in load flow and cbest modelling?

asked 2020-04-30 23:19:15 -0500

maryamfzainal gravatar image

currently i am working on effect of renewable energy on system frequency and how battery energy storage can solve this issue. unfortunately i have no idea on how to model BESS in PSSE32. can someone guide me on how to model bess in load flow as well as on dynamic modelling.

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answered 2020-05-05 08:10:22 -0500

haugstenrod gravatar image

updated 2020-05-08 02:25:09 -0500

I wrote Siemens PTI support about this issue not too long ago, and the reply was that the recommended models for modelling this dynamically are the REGCAU/REECCU/REPCAU models, added as generator control, voltage control and auxiliary control for the renewable plant respectively. You can find descriptions of the models in the model documentation, and WECC have some pretty neat battery modelling guidelines to these models, which are easily found by a google search on "WECC battery modelling guidelines" for instance.

If you decide to use these renewable energy ("RE") models, the BESS should be modelled as a wind machine in the load flow, with Zsorce as @pssuser writes. You can set active power between +/- Pmax, and the dynamic model picks it up when initializing for dynamic simulations.

...but now I see that you are using PSSE v32 - are the "RE"-models included in v32?

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Those models were added in rev 33.4.

perolofl gravatar imageperolofl ( 2020-05-07 03:34:26 -0500 )edit

OK, thanks @perolofl. I'll leave the comment in though for anyone searching for the topic in the future.

haugstenrod gravatar imagehaugstenrod ( 2020-05-08 02:24:48 -0500 )edit

answered 2020-05-04 05:44:08 -0500

perolofl gravatar image

CBEST is modelled in load flow (saved case) as a synchronous generator (not a wind machine). Set Pgen=0 and Mbase to Pmax of the battery storage.

In a dynamic simulation you can change the output of the battery storage by changing VAR(L) to a proper value, positive for discharge and negative for charge of the battery. That means that you have to control the output manually, or use a user-written model to update VAR(L) of CBEST model.

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answered 2020-05-03 12:30:17 -0500

pssuser gravatar image

BESS storage are modelled as a renewable machine in load floaw study with Zsorce=99999. For dynamic simulation, check Psse manual PAGV2. Hope it will help

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thanks for your answer, btw, in load flow, how about the pgen and pmax?

maryamfzainal gravatar imagemaryamfzainal ( 2020-05-03 22:21:42 -0500 )edit

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Asked: 2020-04-30 23:19:15 -0500

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Last updated: May 08 '20