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The manuals that ship with PSSE are an excellent source for information on the operation of the PSSE software. These can be found in your PSSE installation folder.

There is a section of the Program Application Guide Volume 2 that covers CBEST modelling in PSSE. Please see Section 25.8.4 of PSSE 33.9 Program Application Guide Volume 2:

"25.8.4 CBEST (EPRI Battery Energy Storage)... The BES is modeled in the power flow as a generator with a large ZSORCE impedance... If MBASE is set equal to the battery power rating, Pmax is set to 1. Iacmax is set to Pmax/Power Factor. AVR parameters are set as in the SMES model. Assuming an 80% turnaround efficiency, retrieval (OutEff) and storage (InpEff) efficiencies would typically be set to 1.1 and 0.9, respectively."

Set your dynamic model parameters according to the manufacturers information for your BES. Use the DOCU function to check the data you have entered in your dynamic model is reasonable. Run test simulations to ensure the response of your BES model is reasonable.

Have you considered using the REGCAU1, REECCU1, and REPCAU1 model for BES? These models can give a much more detailed representation of BES. As this is a WECC generic model, there are some good modelling guidelines for these models available on their website. https://www.wecc.biz/Reliability/WECC%20Approved%20Energy%20Storage%20System%20Model%20-%20Phase%20II.pdf