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

answered 2020-05-05 08:10:22 -0600

haugstenrod
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updated 2020-05-08 02:25:09 -0600

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?

answered 2020-05-04 05:44:08 -0600

perolofl
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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.

answered 2020-05-03 12:30:17 -0600

pssuser
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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