Governor Model: TGOV3 and TGOV3D
AutoCorrection Properties
Following checks and corrections are applied during Validation and AutoCorrection.
- If 0.0 < T5 < 0.25*Mult*TimeStep then T5 = 0.0
ElseIf 0.25*Mult*TimeStep < T5 < 0.5*Mult*TimeStep then T5 = 0.5*Mult*TimeStep - If 0.0 < T3 < 0.25*Mult*TimeStep then < = 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.
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 Pmech > Pmax , then Pmax = Pmech or if Pmech < Pmin , then Pmin = Pmech
Model Equations and/or Block Diagrams
Parameters for TGOV3:
| Trate | Turbine rating, MW |
| K | Governor gain (recirpocal of droop), pu |
| T1 | Governor lead time constant, sec |
| T2 | Governor lag time constant, sec |
| T3 | Valve positioner time constant, sec |
| Uo | Maximum valve opening velocity, pu/sec |
| Uc | Maximum valve closing velocity, pu/sec |
| Pmax | Maximum valve opening, pu of mwcap |
| Pmin | Minimum valve opening, pu of mwcap |
| T4 | Inlet piping/steam bowl time constant, sec |
| K1 | Fraction of hp shaft power after first boiler pass |
| T5 | Time constant of second boiler pass (i.e. reaheater), sec |
| K2 | Fraction of lp shaft power after first boiler pass |
| T6 | Time constant of crossover of third boiler pass, sec |
| K3 | Fraction of hp shaft power after second boiler pass |
| Ta | Time to close Intercept Valve (IV), sec |
| Tb | Time until Intercept Valve starts to reopen, sec |
| Tc | Time until Intercept Valve is fully open, sec |
| Prmax | Maximum pressure in reheater, 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 |
| Gv6 | Nonlinear gain point 6, pu gv |
| Pgv6 | Nonlinear gain point 6, pu power |
Parameters for TGOV3D:
| K | Governor gain (recirpocal of droop), pu |
| T1 | Governor lead time constant, sec |
| T2 | Governor lag time constant, sec |
| T3 | Valve positioner time constant, sec |
| Uo | Maximum valve opening velocity, pu/sec |
| Uc | Maximum valve closing velocity, pu/sec |
| Pmax | Maximum valve opening, pu of mwcap |
| Pmin | Minimum valve opening, pu of mwcap |
| T4 | Inlet piping/steam bowl time constant, sec |
| K1 | Fraction of hp shaft power after first boiler pass |
| T5 | Time constant of second boiler pass (i.e. reaheater), sec |
| K2 | Fraction of lp shaft power after first boiler pass |
| T6 | Time constant of crossover of third boiler pass, sec |
| K3 | Fraction of hp shaft power after second boiler pass |
| Ta | Time to close Intercept Valve (IV), sec |
| Tb | Time until Intercept Valve starts to reopen, sec |
| Tc | Time until Intercept Valve is fully open, sec |
| Prmax | Maximum pressure in reheater, pu |
| dbH | Deadband High (pu) |
| dbL | Deadband Low (pu) |
| Trate | Turbine rating, MW |