Exciter Model: DC4C

 

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:

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
SCL SCL input: if = 2, HV gate; if < 2, add to error signal
SW1 Logical switch 1 (1 = Position A, 2 = Position B)
Tr Filter time constant, sec.
Kpr Proportional gain
Kir Integral gain
KDR Derivative gain
TDR 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
Kp Potential circuit gain coefficient
Ki Potential circuit current gain coefficient
XL Reactance associated with potential source
ThetaP Potencial circuit phase angle, degrees
KC1 Rectifier loading factor proportional to commutating reactance
Vbmax Maximum available exciter field voltage
Spdmlt If = 1, multiply output (Efd) by generator speed