Over Excitation Limiter Model: OEL5C

Following checks and corrections are applied during Validation and AutoCorrection.

• If Toel <= 0 then Toel = Mult*TimeStep
• If 0.0 < TF1 < 0.25*Mult*TimeStep then TF1 = 0.0
  ElseIf 0.25*Mult*TimeStep < TF1 < 0.5*Mult*TimeStep then TF1 = 0.5*Mult*TimeStep
• If 0.0 < TF2 < 0.25*Mult*TimeStep then TF2 = 0.0
  ElseIf 0.25*Mult*TimeStep < TF2 < 0.5*Mult*TimeStep then TF2 = 0.5*Mult*TimeStep
• If VOELmax < VOELmin then swap the values. If VOELmax < 0 then VOELmax change sign to positive. If VOELmin > 0 then change sign to negative.
• If VVFEmax < VVFEmin then swap the values. If VVFEmax < 0 then VVFEmax change sign to positive. If VVFEmin > 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 IntegratorPIKPvKIv > VVFEmax, then VVFEmax = IntegratorPIKPvKIv limits or if IntegratorPIKPvKIv < VVFEmin, then VVFEmin = IntegratorPIKPvKIv
• If IntegratorPIKPKI > VOELmax, then VOELmax = IntegratorPIKPKI limits or if IntegratorPIKPKI < VOELmin, then VOELmin = IntegratorPIKPKI