Governor Model: UCCPSS
AutoCorrection Properties
Following checks and corrections are applied during Validation and AutoCorrection.
- For the parameters Tp, Tdg, Tthcp, TdGT, TvGT, TdST, and TvST 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 - For the parameters Tdrum, the following check is done
If 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 |
| TnGT | Heat transfer lead time constant |
| TdGT | Heat transfer lag time constant |
| TvGT | 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 |
| TrateGT | Gas Turbine rating in MW |
| Pgt1 | Power Point #1 for Heat versus gas turbine power function |
| Qgt1 | Heat at Power Point #1 for Heat versus gas turbine power function |
| Pgt2 | Power Point #2 for Heat versus gas turbine power function |
| Qgt2 | Heat at Power Point #2 for Heat versus gas turbine power function |
| Pgt3 | Power Point #3 for Heat versus gas turbine power function |
| Qgt3 | Heat at Power Point #3 for Heat versus gas turbine power function |
| Pgt4 | Power Point #4 for Heat versus gas turbine power function |
| Qgt4 | Heat at Power Point #4 for Heat versus gas turbine power function |
| Pgt5 | Power Point #5 for Heat versus gas turbine power function |
| Qgt5 | Heat at Power Point #5 for Heat versus gas turbine power function |
| Pgt6 | Power Point #6 for Heat versus gas turbine power function |
| Qgt6 | Heat at Power Point #6 for Heat versus gas turbine power function |
| Pgt7 | Power Point #7 for Heat versus gas turbine power function |
| Qgt7 | Heat at Power Point #7 for Heat versus gas turbine power function |
| Tdrum | Drum time constant |
| Km | Pressure loss due to flow friction in the boiler tubes |
| TvST | Actuator time constant for main steam |
| Kp | Governor proportional gain |
| Ki | Governor integral gain |
| TnST | Turbine lead time constant |
| TdST | Turbine lag time constant |
| Qs | Amount of supplemental firing, in per unit, applied to the boiler; it is to be defined by the user or by the program upon initialization of the model. |
| Bv | Fixed position of the bypass valve defined by the user to simulate a fixed amount of steam extraction. |
| Pref | Minimum steam pressure reference |
| TrateST | Steam Turbine rating in MW |