Exciter Model: DC4B and ESDC4B

 

Following checks and corrections are applied during Validation and AutoCorrection.

  • If 0 < Te < Mult*TimeStep then Te = Mult*TimeStep
  • If 0 < Ta < Mult*TimeStep then Ta = Mult*TimeStep
  • If 0.0 < Tr < 0.5*Mult*TimeStep then Tr = 0, ElseIf 0.5*Mult*TimeStep < Tr < Mult*TimeStep then Tr = Mult*TimeStep
  • If 0.0 < Td <0.5*Mult*TimeStep then Td = 0, ElseIf 0.5*Mult*TimeStep < Td < Mult*TimeStep then Td = Mult*TimeStep
  • If 0.0 < Tf < 0.5*Mult*TimeStep then Tf = 0, ElseIf 0.5*Mult*TimeStep < Tf < Mult*TimeStep then Tf = Mult*TimeStep
  • If Vrmax < Vrmin 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 Vr > Vrmax, then Vrmax = Vr or if Vr < Vrmin, then Vrmin = Vr

Model Equations and/or Block Diagrams

  

Parameters for DC4B:

OEL OEL input: if = 2, LV gate; if < 2, subtract from error signal
UEL UEL input: if = 2, HV gate; if < 2, add to error signal
Tr Filter time constant, sec.
Kp Proportional gain
Ki Integral gain
Kd Derivative gain
Td Derivative time constant, sec.
Vrmax Maximum controller output, p.u.
Vrmin Minimum controller output, p.u.
Ka Gain, p.u.
Ta Time constant, sec. (> 0.)
Ke Exciter field resistance line slope margin, p.u.
Te Exciter time constant, sec. (> 0.)
Kf Rate feedback gain
Tf Rate feedback time constant, sec.
Vemin Exciter minimum output
E1 Field voltage value, 1
SE1 Saturation factor at E1
E2 Field voltage value, 2
SE2 Saturation factor at E2

 

Parameters for ESDC4B:

Tr Filter time constant, sec.
Ka Gain, p.u.
Ta Time constant, sec. (> 0.)
Kp Proportional gain
Ki Integral gain
Kd Derivative gain
Td Derivative time constant, sec.
Vrmax Maximum controller output, p.u.
Vrmin Minimum controller output, p.u.
Ke Exciter field resistance line slope margin, p.u.
Te Exciter time constant, sec. (> 0.)
Kf Rate feedback gain
Tf Rate feedback time constant, sec.
E1 Field voltage value, 1
SE1 Saturation factor at E1
E2 Field voltage value, 2
SE2 Saturation factor at E2
Vemin Exciter minimum output
OEL OEL input: if = 2, LV gate; if < 2, subtract from error signal
UEL UEL input: if = 2, HV gate; if < 2, add to error signal
Spdmlt If = 1, multiply output (Efd) by generator speed