Under Excitation Limiter: UEL2

 

Following checks and corrections are applied during Validation and AutoCorrection.

  • If 0.0 < Tuv < 0.5*Mult*TimeStep then Tuv = 0, ElseIf 0.5*Mult*TimeStep < Tuv < Mult*TimeStep then Tuv = Mult*TimeStep
  • If 0.0 < Tup < 0.5*Mult*TimeStep then Tup = 0, ElseIf 0.5*Mult*TimeStep < Tup < Mult*TimeStep then Tup = Mult*TimeStep
  • If 0.0 < Tuq < 0.5*Mult*TimeStep then Tuq = 0, ElseIf 0.5*Mult*TimeStep < Tuq < Mult*TimeStep then Tuq = Mult*TimeStep
  • If 0.0 < TuL < 0.5*Mult*TimeStep then TuL = 0, ElseIf 0.5*Mult*TimeStep < TuL < Mult*TimeStep then TuL = Mult*TimeStep
  • 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 for UEL2 and UEL2_PTI:

K1 Voltage exponent
K2 Voltage exponent
Qquad 0: Mirror image around MVAR axix
Tuv Voltage filter time constant, sec.
Tup Real power filter time constant, sec.
Tuq Reactive power filter time constant, sec.
Kui Integral gain, p.u./sec
Kul Proportional gain, p.u.
Vuimax PI control block maximum output, p.u.
Vuimin PI control block minimum output, p.u.
Kuf Excitation system stabilizer gain, p.u.
Kfb Gain
TuL Time constant, sec.
Tu1 Lead time constant, sec.
Tu2 Lag time constant, sec.
Tu3 Lead time constant, sec.
Tu4 Lag time constant, sec.
P0 Point 0 real power, p.u.
Q0 Point 0 reactive power, p.u.
P1 Point 1 real power, p.u.
Q1 Point 1 reactive power, p.u.
P2 Point 2 real power, p.u.
Q2 Point 2 reactive power, p.u.
P3 Point 3 real power, p.u.
Q3 Point 3 reactive power, p.u.
P4 Point 4 real power, p.u.
Q4 Point 4 reactive power, p.u.
P5 Point 5 real power, p.u.
Q5 Point 5 reactive power, p.u.
P6 Point 6 real power, p.u.
Q6 Point 6 reactive power, p.u.
P7 Point 7 real power, p.u.
Q7 Point 7 reactive power, p.u.
P8 Point 8 real power, p.u.
Q8 Point 8 reactive power, p.u.
P9 Point 9 real power, p.u.
Q9 Point 9 reactive power, p.u.
P10 Point 10 real power, p.u.
Q10 Point 10 reactive power, p.u.
VULmax Maximum limit, p.u.
VULmin Minimum limit, p.u.