asked 2022-09-19 08:41:41 -0500

HSU gravatar image

updated 2022-09-21 09:11:22 -0500

hi everyone, I'm trying to add a CBEST model in my system,during the dynamics simulation here is the imformation from output bar,could someone help me understand how to resolve it,thanks.


  I   DSTATE(I)    STATE(I)     MODEL             STATE     BUS# X-- NAME --X BASKV  ID
 6460    1.1000       0.0000      CBEST              K+3       2       ESSG   22.800  1

CBEST dynamics data

value  descrption                                                                                                               1       PMAX (pu on MBASE)                                                                           1.1     OutEff (>= 1) Output Efficiency                                 
0.9     InpEff (<= 1) Input Efficiency                                                                  1.2     IACMAX (pu)
100     KAVR, AVR gain
0       T1, AVR time constant (sec)
1       T2, AVR time constant (sec)
0.05    T3, AVR time constant (sec) ( >0 )
10      T4, AVR time constant (sec)
1       VMAX, AVR speed limit (pu)
-1      VMIN, AVR speed limit (pu) ( <0 )
0.025   DROOP (pu)
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It is better to show the load flow data for the generator and the dynamic data for CBEST.

perolofl gravatar imageperolofl ( 2022-09-20 04:05:41 -0500 )edit

thanks your reply,here is the dynamics data I set.And the load flow data I only set Pgen into 100MW others parameter I use the default value.

HSU gravatar imageHSU ( 2022-09-21 09:14:44 -0500 )edit

check the limits on that model. that state variable is exceeding some limit in the model

bikiran1991 gravatar imagebikiran1991 ( 2022-09-22 15:42:53 -0500 )edit

This is a problem caused by the initial output of the ESS not being 0MW. K+3 of the CBEST model means Energy Ouput. I think ESSG has 110MW of output. Therefore, SOC fluctuations occur, and the CBEST model recognizes them as INITIAL CONDITIONS SUSPECT.

KYC_Korea gravatar imageKYC_Korea ( 2023-03-15 08:56:51 -0500 )edit

As this is a model problem, it seems safe to ignore it,. if it is concerned, it is recommended to use the ESS model reflecting SOC. See "how to model battery energy storage in load flow and cbest modelling?" for details.

KYC_Korea gravatar imageKYC_Korea ( 2023-03-15 08:58:24 -0500 )edit