Governor Model: UCBGT
AutoCorrection Properties
Following checks and corrections are applied during Validation and AutoCorrection.
- For the parameters Tp, Tdg, Tthcp, Td, and Tv, the following check is done
If 0.0 < Param < 0.5*Mult*TimeStep then Param = 0
ElseIf 0.5*Mult*TimeStep < Param < Mult*TimeStep then Param = Mult*TimeStep - rfmax and rfmin are flipped if rfmax < rfmin
- Fmax and Fmin are flipped in Fmax < Fmin
- Vmax and Vmin are flipped in Vmax < Vmin
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
The following parameters interpretations are applied when running transient stability
- The absolute value of Dbd and Err are used.
Model Equations and/or Block Diagrams
Parameters:
| Rp | Electrical power feedback droop |
| Tp | Electrical power feedback time constant |
| Rv | Governor feedback droop |
| Kmwp | Proportional gain for outer loop MW control |
| Kmwi | Integral gain for outer loop MW control |
| rfmax | Maximum limit on outer loop MW control loop |
| rfmin | Minimum limit on outer loop MW control loop |
| Dbd | Intentional deadband |
| Err | Intentional error limit |
| Ta | Acceleration control differentiator time constant |
| aset | Acceleration limit set-point |
| Kpg | Speed governor proportional gain |
| Kig | Speed governor integral gain |
| Kdg | Speed governor derivative gain |
| Tdg | Speed governor derivative time constant |
| Kpa | Acceleration control proportional gain |
| Kia | Acceleration control integral gain |
| Kpt | Temperature control proportional gain |
| Kit | Temperature control integral gain |
| Fmax | Maximum fuel flow command |
| FMin | Minimum fuel flow command |
| Tlimit | Temperature limit (in pu corresponds to fuel flow required for 1 pu turbine power i.e. = 1/Kt + Wfo) (4) |
| Tthcp | Thermocouple time constant |
| Tn | Heat transfer lead time constant |
| Td | Heat transfer lag time constant |
| Tv | Fuel system time constant |
| Vmax | Maximum valve opening |
| Vmin | Minimum valve opening |
| Fm | Fuel flow multiplier; typically set to 1.0. In some cases this is equal to speed (e.g. liquid fuel system with shaft driven fuel pump) |
| Wfo | Full-speed no-load fuel flow |
| Kt | Turbine gain |
| Ttn1 | Turbine transfer function numerator time constant 1 |
| Ttn2 | Turbine transfer function numerator time constant 2 |
| Ttd1 | Turbine transfer function denominator time constant 1 |
| Ttd2 | Turbine transfer function denominator time constant 2 |
| x1 | Turbine characteristic curve speed 1 |
| Fx1 | Turbine characteristic curve output for speed 1 |
| x2 | Turbine characteristic curve speed 2 |
| Fx2 | Turbine characteristic curve output for speed 2 |
| x3 | Turbine characteristic curve speed 3 |
| Fx3 | Turbine characteristic curve output for speed 3 |
| Trate | Turbine rating in MW |