Over Excitation Limiter Model: OEL3C

Following checks and corrections are applied during Validation and AutoCorrection.

• If Kscalse <= 0.0001 then Kscalse = 0.0001

• If Koel <= 0.0001 then Koel = 0.0001
• If Toel <= 0 then Toel = Mult*TimeStep
• If 0.0 < TF < 0.25*Mult*TimeStep then TF = 0.0
  ElseIf 0.25*Mult*TimeStep < TF < 0.5*Mult*TimeStep then TF = 0.5*Mult*TimeStep
• If VOELmax1 < VOELmin1 then swap the values. If VOELmax1 < 0 then VOELmax1 change sign to positive. If VOELmin1 > 0 then change sign to negative.
• If VOELmax2 < VOELmin2 then swap the values. If VOELmax2 < 0 then VOELmax2 change sign to positive. If VOELmin2 > 0 then change sign to negative.

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 VIOEL > VOELmax1, then VOELmax1 = VIOEL limits or if VIOEL < VOELmin1, then VOELmin1 = VIOEL
• If VOEL > VOELmax2, then VOELmax2 = VOEL limits or if VOEL < VOELmin2, then VOELmin2 = VOEL