Exciter Model: ST10C

 

Following checks and corrections are applied during Validation and AutoCorrection.

  • If Kr <= 0 then Kr = 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 0.0 < T1 < 0.5*Mult*TimeStep then T1 = 0, ElseIf 0.5*Mult*TimeStep < T1 < Mult*TimeStep then T1 = Mult*TimeStep
  • If Vrmax < Vrmin then swap the values
  • If Vrsmax < Vrsmin 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 limits or if Vr < Vrmin, then Vrmin = Vr
  • If Vrs > Vrsmax, then Vrsmax = Vrs limits or if Vrs < Vrsmin, then Vrsmin = Vrs

Model Equations and/or Block Diagrams

Parameters:

VOS PSS input: if = 1, add to error signal; if = 2, add in SWLim Logic; if = 3, add to VS2 Sum
OEL OEL input: if < 2, add to error signal; if = 2, LV gate 1; if = 3, LV gate 2
UEL UEL input: if < 2, add to error signal; if = 2, HV gate 1; if = 3, HV gate 2
SCL SCL input: if < 2, add to error signal; if = 2, Take Over 2; if = 3, Take Over 3
SW1 Logical switch 1 (1 = Position A, 2 = Position B)
Tr Filter time constant, sec
Kr Field voltage feedback gain, pu
TC1 Lead time constant 1, sec
TB1 Lag time constant 1, sec
TC2 Lead time constant 2, sec
TB2 Lag time constant 2, sec
TUC1 UEL lead time constant 1, sec.
TUB1 UEL lag time constant 1, sec.
TUC2 UEL lead time constant 2, sec.
TUB2 UEL lag time constant 2, sec.
TOC1 OEL lead time constant 1, sec.
TOB1 OEL lag time constant 1, sec.
TOC2 OEL lead time constant 2, sec.
TOB2 OEL lag time constant 2, sec.
VRSmax Maximum exciter control signal, pu
VRSmin Minimum exciter control signal, pu
VRmax Maximum exciter control signal, pu
VRmin Minimum exciter control signal, pu
T1 Inverse timing current constant, sec
Kp Potential source gain, pu
KC Rectifier loading factor proportional to commutating reactance
KI Potential circuit (current) gain coefficient
XL Reactance associated with potential source
ThetaP Potencial circuit phase angle, degrees
VbMax Maximum available exciter field voltage