Exciter Model: DC3A and ESDC3A

 

Following checks and corrections are applied during Validation and AutoCorrection.

  • If 0 < Te < Mult*TimeStep then Te = Mult*TimeStep
  • If 0.0 < Tr < 0.5*Mult*TimeStep then Tr = 0.0

    ElseIf 0.5*Mult*TimeStep < Tr < Mult*TimeStep then Tr = Mult*TimeStep
  • If Vrmax < Vrmin then swap the values
  • If Trh <= 0 then Trh = 0
  • If Kv <= 0 then Kv = 0

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 Vr > Vrmax, then Vrmax = Vr or if Vr < Vrmin, then Vrmin = Vr

Model Equations and/or Block Diagrams

   

Parameters for DC3A:

Tr Filter time constant, sec.
Kv Voltage error threshold min/max control action, p.u. (> 0.)
VrMax Maximum control element output, p.u.
VrMin Minimum control element output, p.u.
Trh Rheostat full range travel time, sec. (> 0.)
Te Exciter field time constant, sec. (> 0.)
Ke Exciter field resistance line slope margin p.u.
Vemin Exciter minimum limit
E1 Field voltage value, 1
SE1 Saturation factor at E1
E2 Field voltage value, 2
SE2 Saturation factor at E2

 

Parameters for ESDC3A:

Tr Filter time constant, sec.
Trh Rheostat full range travel time, sec. (> 0.)
Kv Voltage error threshold min/max control action, p.u. (> 0.)
Vrmax Maximum control element output, p.u.
Vrmin Minimum control element output, p.u.
Te Exciter field time constant, sec. (> 0.)
Ke Exciter field resistance line slope margin p.u.
E1 Field voltage value, 1
SE1 Saturation factor at E1
E2 Field voltage value, 2
SE2 Saturation factor at E2
Spdmlt If = 1, multiply output (Efd) by generator speed
exclim If not 0, apply lower limit of 0. to exciter output