Exciter Model: ST3C

Following checks and corrections are applied during Validation and AutoCorrection.

• If 0.0 < Tb < 0.5*Mult*TimeStep then Tb = 0, ElseIf 0.5*Mult*TimeStep < Tb < Mult*TimeStep then Tb = Mult*TimeStep
• If 0.0 < Tm < 0.5*Mult*TimeStep then Tm = 0, ElseIf 0.5*Mult*TimeStep < Tm < Mult*TimeStep then Tm = 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 Ka = 0 then Ka = Mult*TimeStep
• If Km = 0 then Km = Mult*TimeStep
• If Vrmax < Vrmin then swap the values
• If Vmmax < Vmmin then swap the values

• If VPImax < VPImin then swap the values

• Kpr and Kir: Kpr can't be 0 if Kir = 0, if true then Kpr changed to 40.

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
• If VPI > VPImax, then VPImax = VPI or if VPI < VPImin, then VPImin = VPI
• If Vm > Vmmax, then Vmmax = Vm or if Vm < Vmmin, then Vmmin = Vm