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SEXS out of limits and initial conditions suspect

asked 2022-03-30 02:15:18 -0600

angelonso gravatar image

updated 2022-03-30 05:23:45 -0600

Hello and thank you for taking the time for reading. I have a problem with my PSSE dynamic model. The problem PSSE reports is a huge limits violation for the SEXS exiter model.

Model SEXS Bus 206 [GEQ_SS REYES220.00] Machine "2 " :
 Initial EFD=   4.915     Initialized out of limit EMAX=   4.000

 Model SEXS Bus 11 [PORTUGAL    400.00] Machine "1 " :
 Initial EFD=   5.617     Initialized out of limit EMAX=   4.000

 Model SEXS Bus 101 [EUR_CENTRAL 400.00] Machine "1 " :
 Initial EFD=  0.1146E+05 Initialized out of limit EMAX=   4.000

The generator at bus 101 is an equivalent of a huge area, maybe that is the problem. Its values are 480000 Mbase, 600000 Pmax and Qmax and then Emax is 4. I dont know how to adequate the dynamic data to the generator, It would be of much help if someone could indicate what should I do in order to correct this problem :).

The initial condition suspects I get are the following:

      I   DSTATE(I)    STATE(I)     MODEL             STATE     BUS#-SCT X-- NAME --X BASKV  ID
     62  -0.18309       1.5010      GENSAL             K         206     GEQ_SS REYES220.00  2
    101  -0.35923       1.9521      GENROU             K          11     PORTUGAL    400.00  1
    107   -2544.8       57.973      GENROU             K         101     EUR_CENTRAL 400.00  1
    108   0.11625E-02 -0.69986E-02  GENROU             K+1       101     EUR_CENTRAL 400.00  1

Aditional power flow info:

Vsched:1,0000   PGen:442203,1000    Pmax:600000,0000    Pmin:-9999,0000 QGen:145038,5000    Qmax:600000,0000    Qmin:-9999,0000 Mbase:486340,00 Rsource:0,000000    Xsource:0,250000    RTran:0,00000   XTran:59,75000  Gentap:1,00000

Aditional dynamic info for GENROU:

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answered 2022-03-30 03:46:05 -0600

perolofl gravatar image

How much is Pgen and Qgen for the generator at bus 101? Please show the load flow data and the GENROU data for the generator.

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I just updated the question with the information that you asked :). Thank you very much for looking into it.

angelonso gravatar imageangelonso ( 2022-03-30 05:24:23 -0600 )edit

The problem is XTran. The value is far too high. From where do you get the value 59.75 pu? Set the value to zero and it should work much better. The value corresponds to a transformer reactance of 5975%. A normal value would be 0.12 to 0.15 pu

perolofl gravatar imageperolofl ( 2022-03-30 05:37:12 -0600 )edit

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Asked: 2022-03-30 02:15:18 -0600

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Last updated: Mar 30 '22