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Hi patrickrossiter, I do have initialization suspect. Here I only paste part of the message related to switched shunt. As you suggested, I looked up generator with terminal voltage being 0.9861pu and found two. But neither of their P/Q is beyond limits, however, one generator has Pgen=Pmax=Pmin=0.

INITIAL CONDITIONS SUSPECT: I DSTATE(I) STATE(I) MODEL STATE BUS# X-- NAME --X BASKV ID 203 0.22517 1.0232 GENSAL K 20691 2GPSG1 11.500 1 208 0.20950 1.0042 GENSAL K 20692 2GPSG2 11.500 2 213 0.46492E-02 -0.14608 CSVCQA K 20750 2SYWS1 330.00 1 4564 0.12042E-03 0.62448E-02 UN6UEL K+1 20023 2EPSG3 23.000 3 4918 0.38564E-01 3.0661 UN6EXC K+7 20021 2EPSG1 23.000 1 4930 0.12042E-03 0.62448E-02 UN6EXC K+1 20023 2EPSG3 23.000 3 5339 0.10780E-03 0.14448E-02 ZMSSE2 K+3 30331 3MURG11 17.000 11 5353 0.12899E-03 0.14302E-02 ZMSSE2 K+3 30332 3MURG12 17.000 12 5367 0.11199E-03 0.14251E-02 ZMSSE2 K+3 30333 3MURG13 17.000 13 5381 0.91735E-04 0.14428E-02 ZMSSE2 K+3 30334 3MURG14 17.000 14 ODE 4 ODE 4 ODE 4 ODE 4 NO ACTIVE TABLE MODEL CALL FOR SWITCHED SHUNT AT BUS 20405 [2BUKG5 11.000] NO ACTIVE TABLE MODEL CALL FOR SWITCHED SHUNT AT BUS 20640 [2GADG1 11.000]

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Hi patrickrossiter, I do have initialization suspect. Here I only paste part of the message related to switched shunt. As you suggested, I looked up generator with terminal voltage being 0.9861pu and found two. But neither of their P/Q is beyond limits, however, one generator has Pgen=Pmax=Pmin=0.

INITIAL CONDITIONS SUSPECT:
     I   DSTATE(I)    STATE(I)     MODEL             STATE     BUS# X-- NAME --X BASKV  ID
   203   0.22517       1.0232      GENSAL             K       20691 2GPSG1 2GPS_G1     11.500  1
   208   0.20950       1.0042      GENSAL             K       20692 2GPSG2 2GPS_G2     11.500  2
   213   0.46492E-02 -0.14608      CSVCQA             K       20750 2SYWS1 2SYW_S1     330.00  1
  4564   0.12042E-03  0.62448E-02  UN6UEL             K+1     20023 2EPSG3 2EPS_G3     23.000  3
  4918   0.38564E-01   3.0661      UN6EXC             K+7     20021 2EPSG1 2EPS_G1     23.000  1
  4930   0.12042E-03  0.62448E-02  UN6EXC             K+1     20023 2EPSG3 2EPS_G3     23.000  3
  5339   0.10780E-03  0.14448E-02  ZMSSE2             K+3     30331 3MURG11 3MUR_G11    17.000  11
  5353   0.12899E-03  0.14302E-02  ZMSSE2             K+3     30332 3MURG12 3MUR_G12    17.000  12
  5367   0.11199E-03  0.14251E-02  ZMSSE2             K+3     30333 3MURG13 3MUR_G13    17.000  13
  5381   0.91735E-04  0.14428E-02  ZMSSE2             K+3     30334 3MURG14 3MUR_G14    17.000  14
ODE 4
ODE 4
ODE 4
ODE 4
NO ACTIVE TABLE MODEL CALL FOR SWITCHED SHUNT AT BUS  20405 [2BUKG5 [2BUK_G5     11.000]
NO ACTIVE TABLE MODEL CALL FOR SWITCHED SHUNT AT BUS  20640 [2GADG1     11.000]
[2GAD_G1     11.000]
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