Exciter Model: ESST6B and ST6B

 

Following checks and corrections are applied during Validation and AutoCorrection.

  • If 0.0 < Tr < 0.5*Mult*TimeStep then Tr = 0, ElseIf 0.5*Mult*TimeStep < Tr < Mult*TimeStep then Tr = Mult*TimeStep
  • If 0.0 < Tg < 0.5*Mult*TimeStep then Tg = 0, ElseIf 0.5*Mult*TimeStep < Tg < Mult*TimeStep then Tg = Mult*TimeStep
  • If 0.0 < Ts < 0.5*Mult*TimeStep then Ts = 0, ElseIf 0.5*Mult*TimeStep < Ts < Mult*TimeStep then Ts = Mult*TimeStep
  • Kff and Km: (Kff + Km) can not be zero. Must be fixed.
  • If Kpa = 0 then Kpa = 1
  • If Kia = 0 then Kia = 1
  • 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

Model Equations and/or Block Diagrams

Parameters for ESST6B:
Tr Filter time constant, sec.
Kpa Regulator proportional gain, p.u. (> 0.)
Kia Regulator integral gain, sec-1(> 0.)
VaMax PI maximum output, p.u.
VaMin PI minimum output, p.u.
Kff Feedforward gain, p.u.
Km Main gain, p.u.
Kg Feedback gain p.u.
Tg Feedback time constant, sec.
Vrmax Maximum regulator output, p.u.
Vrmin Minimum regulator output, p.u.
VRMult If non-zero, multiply regulator output by terminal voltage
OEL OEL input selector: 1 – before UEL, 2 – after UEL, 0 – no OEL input
Ilr Field current limiter setpoint, p.u.
Kcl Field current limiter conversion factor
Klr Field current limiter gain, p.u.
Ts Rectifier firing time constant, sec.
 
Parameters for ST6B:
OEL OEL input selector: 1 – before UEL, 2 – after UEL, 0 – no OEL input
Tr Filter time constant, sec.
Kpa Regulator proportional gain, p.u. (> 0.)
Kia Regulator integral gain, sec-1(> 0.)
Kda Regulator derivative gain
Tda Regulator derivative channel time constant
VaMax PI maximum output, p.u.
VaMin PI minimum output, p.u.
Kff Feedforward gain, p.u.
Km Main gain, p.u.
Kcl Field current limiter conversion factor
Klr Field current limiter gain, p.u.
Ilr Field current limiter setpoint, p.u.
Vrmax Maximum regulator output, p.u.
Vrmin Minimum regulator output, p.u.
Kg Feedback gain p.u.
Tg Feedback time constant, sec.