Exciter Model: AC11C

 

Following checks and corrections are applied during Validation and AutoCorrection.

  • If 0 < Te < Mult*TimeStep then Te = Mult*TimeStep
  • If 0 < Tia < Mult*TimeStep then Tia = Mult*TimeStep
  • If 0 < Tio < Mult*TimeStep then Tio = Mult*TimeStep
  • If 0 < Tiu < Mult*TimeStep then Tiu = Mult*TimeStep
  • If Kpa <= 0 then Kpa = Mult*TimeStep
  • If Kpu <= 0 then Kpu = Mult*TimeStep
  • If Kpo <= 0 then Kpo = Mult*TimeStep
  • If Kb <= 0 then Kb = Mult*TimeStep
  • If Tb <= 0 then Tb = Mult*TimeStep
  • If 0.0 < Tr < 0.25*Mult*TimeStep then Tr = 0.0
    ElseIf 0.25*Mult*TimeStep < Tr < 0.5*Mult*TimeStep then Tr = 0.5*Mult*TimeStep
  • If Vrmax < Vrmin then swap the values
  • If Vrsmax < Vrsmin then swap the values
  • 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 Vr > Vrmax, then Vrmax = Vr limits or if Vr < Vrmin, then Vrmin = Vr
  • If Vrs > Vrsmax, then Vrsmax = Vrs limits or if Vrs < Vrsmin, then Vrsmin = Vrs
  • If Va > Vamax, then Vamax = Va limits or if Va < Vamin, then Vamin = Va

Model Equations and/or Block Diagrams

Parameters:

VOS PSS input: if <= 1, add to error signal; if = 2, add in SWLim Logic; if = 3, add to VS2 Sum
OEL OEL input: if <= 1, add to error signal; if = 2, LV gate 1; if = 3, LV gate 2
UEL UEL input: if <= 1, add to error signal; if = 2, HV gate 1; if = 3, HV gate 2
SCL SCL input: if <= 1, add to error signal; if = 2, LV gate 1; if = 3, LV gate 2
SW1 SW1 Logical switch 1 (1 = Position A, 2 = Position B)
Tr Filter time constant, sec
Kpa Amplifier proportional gain, pu
Tia Integrator time constant, sec
KPU Potential source gain, pu
TIU Integrator time constant, sec
Kb Exciter field current controller gain, pu
Tb Time constant, sec
KPO Potential source gain, pu
TIO Integrator time constant, sec
VRSmax Maximum exciter control signal, pu
VRSmin Minimum exciter control signal, pu
VRmax Maximum exciter control signal, pu
VRmin Minimum exciter control signal, pu
VaMax Maximum control element output, pu
VaMin Minimum control element output, pu
Te Exciter field time constant, sec
KC Rectifier loading factor proportional to commutating reactance
Kd Exciter internal reactance, pu
Ke Exciter field resistance constant, pu
Vfemax Exciter field current limit parameter, pu
Vemin Minimimum exciter output voltage, pu
E1 Field voltage value, 1
SE1 Saturation factor at E1
E2 Field voltage value, 2
SE2 Saturation factor at E2
KP Potential source gain, pu
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
VbMax1 Maximum available exciter field voltage
KI2 Potential circuit (current) gain coefficient
KC2 Rectifier loading factor proportional to commutating reactance
VbMax2 Maximum available exciter field voltage
KBOOST Exciter field current controller gain, pu
VBOOST Model Parameters\VBOOST