Exciter Model: ESSURRY and EXAC1M

ESURRY:

Following checks and corrections are applied during Validation and AutoCorrection.

• If 0.0 < Tr < 0.5*Mult*TimeStep then Tf = 0, ElseIf 0.5*Mult*TimeStep < Tr < Mult*TimeStep then Tf = Mult*TimeStep
• 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 < Td < 0.5*Mult*TimeStep then Tb = 0, ElseIf 0.5*Mult*TimeStep < Td < Mult*TimeStep then Tb = Mult*TimeStep
• If 0.0 < T1 < 0.5*Mult*TimeStep then Tb1 = 0, ElseIf 0.5*Mult*TimeStep < T1 < Mult*TimeStep then Tb1 = Mult*TimeStep
• If 0 < Tf < Mult*TimeStep then Tf = Mult*TimeStep
• If 0 < Te < Mult*TimeStep then Te = Mult*TimeStep
• If Kc <= 0 then Kc = 0.01, if Kc > 1 then Kc = 1
• If Vrmax < Vrmin then swap the values

EXAC1M:

Following checks and corrections are applied during Validation and AutoCorrection.

• Same as ESURRY
• Parameter K10 in the block diagram is K1
• Parameter K16 in the block diagram is K2

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