Exciter Model: AC5C

 

Following checks and corrections are applied during Validation and AutoCorrection.

  • If 0 < Te < Mult*TimeStep then Te = Mult*TimeStep
  • If 0 < Tf1 < Mult*TimeStep then Tf2 = Mult*TimeStep
  • If 0.0 < Tf2 < 0.5*Mult*TimeStep then Tf2 = 0, ElseIf 0.5*Mult*TimeStep < Tf2 < Mult*TimeStep then Tf2 = Mult*TimeStep
  • If 0.0 < Ta < 0.5*Mult*TimeStep then Ta = 0, ElseIf 0.5*Mult*TimeStep < 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 Vamax < Vamin 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 Va > Vamax, then Vamax = Va limits or if Va < Vamin, then Vamin = Va

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, LV gate; if < 2, subtract from error signal
Tr Filter time constant, sec
Ka Voltage regulator gain
Ta Voltage regulator time constant, sec
VaMax Maximum control element output, pu
VaMin Minimum control element output, pu
Ke Exciter field resistance constant, pu
Te Exciter field time constant, sec
Kf Rate feedback gain, pu
Tf1 Feedback lag time constant, sec
Tf2 Feedback lag time constant, sec
Tf3 Feedback lead time constant, sec
E1 Field voltage value, 1
SE1 Saturation factor at E1
E2 Field voltage value, 2
SE2 Saturation factor at E2
Kc Rectifier loading factor proportional to commutating reactance
Kd Exciter internal reactance, pu
Vfemax Exciter field current limit parameter, pu
Vemin Minimimum exciter output voltage, pu
Spdmlt If not zero, multiply output (Efd) by generator speed