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The power output of a 50 MW battery shows significant vibration after tripping the largest generator in the Texas synthetic 6717-bus system.

How can I eliminate or mitigate these vibrations? Should I adjust the battery parameters? The battery is modeled using REPC-A, REEC-C, and REGC-A models with the following parameters:

100 'REGCA1' BT 1 0.20000E-01 10.000 0.90000 0.50000 1.2200 1.2000 0.80000 0.40000 -1.3000 0.20000E-01 1.0000 99.000 -99.000 1.0000 /

100 'USRMDL' BT 'REECCU1' 102 0 5 45 7 6 0 0 1 1 0 -99.000 99.000 0.0000 0.0000 0.0000 0.0000 1.0000 -1.0000 1.0350 0.50000E-01 0.16400 -0.16400 1.1000 0.90000 0.0000 0.10000 0.0000 40.000 0.20000E-01 99.000 -99.000 1.0000 -1.0000 1.0200 0.40000E-01 -1.0000 99.000 2.0000 99.000 0.0000 0.0000 0.0000 0.0000 -1.0000 99.000 2.0000 99.000 0.0000 0.0000 0.0000 0.0000 14400. 0.50000 1.0000 0.0000 /

100 'REPCA1' BT 120492 0 0 '0 ' 1 1 1 0.20000E-01 18.000 5.0000 0.0000 0.50000E-01 0.0000 0.0000 0.0000 0.20000E-01 0.50000 -0.50000 0.0000 0.0000 0.16400 -0.16400 0.10000 0.50000E-01 0.25000 0.0000 0.0000 99.000 -99.000 1.0000 -1.0000 0.10000 20.000 20.000 /