Exciter Model: AC7B and ESAC7B

Following checks and corrections are applied during Validation and AutoCorrection.

• If 0 < Te < Mult*TimeStep then Te = Mult*TimeStep
• If 0 < 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

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 Va > Vamax, then Vamax = Va or if Va < Vamin, then Vamin = Va
• If Ve > ((VFemax-Kd*Ifd)/(Ke + Se(Ve)), then VFemax = ((VFemax-Kd*Ifd)/(Ke + Se(Ve)) or if Ve < Vemin, then Vemin = Ve