Exciter Model: SCRX

 

Following checks and corrections are applied during Validation and AutoCorrection.

  • If 0 < Tb < Mult*TimeStep then Tb = Mult*TimeStep
  • If 0.0 < Te < Mult*TimeStep then Te = Mult*TimeStep, elseif Te <= 0 then Te = 0
  • If Kc < 1 then Kc = 1
  • If Efdmax < Efdmin then swap the values

Mult represents the user-specified value Minimum time constant size as multiple of time step option on the Validation page of the Transient Stability Dialog

TimeStep represents the integration time step being used as described on TimeStep

Following treatment is handled during the transient numerical simulation

  • If Efd > Efdmax, then Efdmax = Efd or if Efd < Efdmin, then Efdmin = Efd

Model Equations and/or Block Diagrams

Parameters:

Ta_Tb Ta /Tb - gain reduction ratio of lag-lead element
Tb Denominator time constant of lag-lead block, sec
K Voltage regulator gain
Te Exciter field time constant, sec
Efdmin Minimum excitation output, pu
Efdmax Maximum excitation output, pu
Cswitch 0=bus fed, 1=solid fed
Rc_Rfd Equal 0 for exciter negative field capability, otherwise > 0