Governor Model: URGS3T

 

Following checks and corrections are applied during Validation and AutoCorrection.

  • If 0.0 < Linc < 0.25*Mult*TimeStep then Linc = 0.0
    ElseIf 0.25*Mult*TimeStep < Linc < 0.5*Mult*TimeStep then Linc = 0.5*Mult*TimeStep
  • If 0.0 < T1 < Mult*TimeStep then T1 = Mult*TimeStep
  • If 0.0 < T2 < Mult*TimeStep then T2 = Mult*TimeStep
  • If 0.0 < T3 < Mult*TimeStep then T3 = Mult*TimeStep
  • If 0.0 < Tltr < Mult*TimeStep then Tltr = Mult*TimeStep
  • If B <= 0 then B = 0.1
  • If Lmax <= 0 then Lmax = 0.1
  • If Vmax < Vmin 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 Valve > Vmax, then Vmax = Valve or if Valve < Vmin, then Vmin = Valve

Model Equations and/or Block Diagrams

   

Parameters:

MWCap Turbine Rating, MW
R Permanent droop, pu
T1 Governor mechanism time constant, sec
T2 Turbine power time constant, sec
T3 Turbine exhaust temperature time constant, sec
Lmax Ambient Temperature load limit, pu
Kt Temperature limiter gain
Vmax Maximum turbine power, pu of mwcap
Vmin Minimum turbine power, pu of mwcap
Dturb Turbine damping coefficient, pu
Fidle Fuel flow at zero power output, pu
Rmax Maximum fuel valve opening rate, pu/sec
Linc Valve opening limit, pu
Tltr Valve position averaging time constant, sec
Ltrat Maximum long term fuel valve opening rate, pu/sec
A Turbine power time constant numerator scale factor
B Turbine power time constant denominator scale factor
db1pu Intentional deadband width, pu
Err Intentional db hysteresis, pu
db2pu Unintentional deadband, pu
Gv1 Nonlinear gain point 1, pu gv
Pgv1 Nonlinear gain point 1, pu power
Gv2 Nonlinear gain point 2, pu gv
Pgv2 Nonlinear gain point 2, pu power
Gv3 Nonlinear gain point 3, pu gv
Pgv3 Nonlinear gain point 3, pu power
Gv4 Nonlinear gain point 4, pu gv
Pgv4 Nonlinear gain point 4, pu power
Gv5 Nonlinear gain point 5, pu gv
Pgv5 Nonlinear gain point 5, pu power
Ka Governor gain
T4 Governor lead time constant, sec
T5 Governor lag time constant, sec