Under Excitation Limiter: UEL1

 

Following checks and corrections are applied during Validation and AutoCorrection.

  • If 0.0 < Tu2 < 0.5*Mult*TimeStep then Tu2 = 0, ElseIf 0.5*Mult*TimeStep < Tu2 < Mult*TimeStep then Tu2 = Mult*TimeStep
  • If 0.0 < Tu4 < 0.5*Mult*TimeStep then Tu4 = 0, ElseIf 0.5*Mult*TimeStep < Tu4 < Mult*TimeStep then Tu4 = Mult*TimeStep
  • Kul and Kui: Kul can't be 0 if Kui = 0, if true then Kul changed to 40.

  • If VUImax < VUImin then swap the values. If VUImax < 0 then VUImax change sign to positive. If VUImin > 0 then change sign to negative.

  • If VULmax < VULmin then swap the values. If VULmax < 0 then VULmax change sign to positive. If VULmin > 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

Model Equations and/or Block Diagrams

Parameters:

Kur Radius setting, p.u.
Kuc Center setting, p.u.
Kuf Excitation system stabilizer gain, p.u.
Vurmax Limit, p.u.
Vucmax Limit, p.u.
Kui Integral gain, p.u.
Kul Proportional gain, p.u.
Vuimax PI control maximum output, p.u.
Vuimin PI control minimum output, p.u.
Tu1 Lead time constant, sec.
Tu2 Lag time constant, sec.
Tu3 Lead time constant, sec.
Tu4 Lag time constant, sec.
Vulmax UEL maximum output, p.u.
Vulmin UEL minimum output, p.u.