Exciter Model: AC8B

Following checks and corrections are applied during Validation and AutoCorrection.
- If 0 < Te < Mult*TimeStep then Te = 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 < Tdr < 0.5*Mult*TimeStep then Tdr = 0, ElseIf 0.5*Mult*TimeStep < Tdr < Mult*TimeStep then Tdr = 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 Vpidmax < Vpidmin 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
Model Equations and/or Block Diagrams
Parameters:
Tr | Filter time constant, sec |
Kpr | Proportional gain, pu |
Kir | Integral gain, pu |
Kdr | Regulator derivative gain, pu |
Tdr | Derivative gain washout time constant, sec |
Vrmax | Maximum exciter control signal, pu |
Vrmin | Minimum exciter control signal, pu |
Kpa | Amplifier proportional gain, pu |
Kia | Amplifier integral gain, pu |
VaMax | Maximum control element output, pu |
VaMin | Minimum control element output, pu |
Kp | Potential source gain, pu |
Kl | Exciter field current limiter gain, pu |
KF1 | KF1 |
KF2 | KF2 |
KF3 | Rate feedback gain, pu |
Tf | Rate feedback constant, sec |
Kc | Rectifier loading factor proportional to commutating reactance |
Kd | Exciter internal reactance, pu |
Ke | Exciter field resistance constant, pu |
Te | Exciter field time constant, sec |
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 |