Exciter Model: AC9C

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 < Tf < 0.5*Mult*TimeStep then Tf = 0, ElseIf 0.5*Mult*TimeStep < Tf < Mult*TimeStep then Tf = 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 Vamax < Vamin then swap the values
• If Vpidmax < Vpidmin then swap the values
• If VFWmax < VFWmin 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 VFW > VFWmax, then VFWmax = VFW limits or if VFW < VFWmin, then VFWmin = VFW
• If Va > Vamax, then Vamax = Va limits or if Va < Vamin, then Vamin = Va
• If IFDref > VPIDmax, then VPIDmax = IFDref limits or if IFDref < VPIDmin, then VPIDmin = IFDref