Governor Model: WSIEG1

 

Following checks and corrections are applied during Validation and AutoCorrection.

  • If 0.0 < T3 < 0.25*Mult*TimeStep then T3 = 0.0
    ElseIf 0.25*Mult*TimeStep < T3 < 0.5*Mult*TimeStep then T3 = 0.5*Mult*TimeStep
  • If Uo < Uc then swap the values. If Uo < 0 then Uo change sign to positive. If Uc > 0 then change sign to negative.
  • If Pmax < Pmin then swap the values.
  • K1 to K8: Check K1+K3+K5+K7 and K2+K4+K6+K8 <= 1.0 and if not normalized values to 1.0.

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 Gate > Pmax , then Pmax = Gate or if Gate < Pmin , then Pmin = Gate

Model Equations and/or Block Diagrams

Parameters:

K Governor gain (recirpocal of droop), pu
T1 Governor mechanism time constant, sec
T2 Turbine power time constant, sec
T3 Turbine exhaust temperature time constant, sec
Uo Maximum valve opening velocity, pu/sec
Uc Maximum valve closing velocity, pu/sec
Pmax Maximum gate opening, pu of mwcap
Pmin Minimum gate opening, pu of mwcap
T4 Governor lead time constant, sec
K1 Fraction of hp shaft power after first boiler pass
K2 Fraction of lp shaft power after first boiler pass
T5 Governor lag time constant, sec
K3 Fraction of hp shaft power after second boiler pass
K4 Fraction of lp shaft power after second boiler pass
T6 T, sec
K5 Fraction of hp shaft power after third boiler pass
K6 Fraction of lp shaft power after third boiler pass
T7 T, sec
K7 Fraction of hp shaft power after fourth boiler pass
K8 Fraction of lp shaft power after fourth boiler pass
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
Iblock Pmin and Pmax initialization.