Turbine Governors

On this page:

1 gov_GAST, gov_PSSE_GAST
2 gov_GGOV1, gov_PSSE_GGOV1
3 gov_HYGOV, gov_PSSE_HYGOV
4 gov_IEEEG1, gov_PSSE_IEEEG1
5 gov_IEEEG2, gov_PSSE_IEEEG2
6 gov_IEESGO, gov_PSSE_IEESGO
7 gov_TGOV1, gov_PSSE_TGOV1

Notes

The turbine-governor data comes from ElmDsl section in the DGS-XML file. The following tables outline the required parameters for each turbine-governor that is accessible through the Native Library.
Parameter "PN" for all Turbine Governor models and "At" for TGOV1 are not imported.
The version of the Governor components can be determined using the following pattern:

Version	Type Prefix

Version	Type Prefix
PowerFactory 2022 and prior versions	gov_
PowerFactory 2023 and more recent versions	gov_PSSE_

gov_GAST, gov_PSSE_GAST

These PowerFactory components are mapped to GAST component of the Native Library.

Parameters from ElmDsl Section

Parameter	Description	Acceptable Values

Parameter	Description	Acceptable Values
`R`	Speed Droop [pu]	Any value
`T1`	Controller Time Constant [s]
`T2`	Actuator Time Constant [s]
`T3`	Compressor Time Constant [s]
`AT`	Ambient Temperature Load Limit [pu]
`Kt`	Turbine Factor [pu]
`Dturb`	Frictional losses factor pu [pu]
`PN`	Turbine Rated Power (=0→PN=Pgnn) [MW]
`Vmin`	Controller Minimum Output [pu]
`Vmax`	Controller Maximum Output [pu]

gov_GGOV1, gov_PSSE_GGOV1

These PowerFactory components are mapped to GGOV1 component of the Native Library.

Parameters from ElmDsl Section

Parameter	Description	Acceptable Values

Parameter	Description	Acceptable Values
`Ldref`	Load Limiter Reference Value [pu]	Any value
`Kturb`	Turbine Gain [pu]
`Wfnl`	No Load Fuel Flow [pu]
`Kpload`	Load Limiter Proportional Gain [pu]
`Tfload`	Load Limiter Time Constant [s]
`Tsa`	Temperature Detection Lead Time Constant [s]
`Tsb`	Temperature Detection Lag Time Constant [s]
`Ka`	Acceleration Limiter Gain [pu/s]
`Ta`	Acceleration Limiter Time Constant [s]
`Kimw`	Power Controller Reset Gain [pu]
`Tpelec`	Electrical Power Transducer time constant [s]
`Rselect`	Governor Droop Feedback Signal Selector [-]
`Aset`	Acceleration Limiter Setpoint [pu/s]
`r`	Permanent Droop [pu]
`db`	Speed Governor Deadband [pu]
`Kpgov`	Governor Proportional Gain [pu]
`Kigov`	Governor Integral Gain [pu]
`Kdgov`	Governor Derivative Gain [pu]
`Tdgov`	Governor Derivative Controller Time Constant [s]
`Tact`	Actuator Time Constant [s]
`Trate`	Turbine Rated Power (=0→PN=Pgnn) [MW]
`Dm`	Mechanical Damping Coefficient [pu]
`Flag`	Switch for Fuel Source Coefficient [-]
`bf1`	Turbine 2nd Factor [pu]
`Teng`	Diesel Engine Transport Time Constant [s]
`Tc`	Turbine Lead Time Constant [s]
`Tb`	Turbine Lag Time Constant [s]
`Tc`	Temperature Control [grd.F]
`Kiload`	Load Limiter Integral Gain [pu]
`rdown`	Maximum Rate of Load Limit Decrease [pu/s]
`minerr`	Minimum Speed Error Signal [pu]
`Vmin`	Minimum Valve Position Limit [pu]
`rclose`	Maximum Valve Closing Rate [pu/s]
`rup`	Maximum Rate of Load Limit Increase [pu/s]
`maxerr`	Maximum Speed Error Signal [pu]
`Vmax`	Maximum Valve Position Limit [pu]
`ropen`	Maximum Valve Opening Rate [pu/s]

gov_HYGOV, gov_PSSE_HYGOV

These PowerFactory components are mapped to the HYGOV component of the Native Library.

Parameters from ElmDsl Section

Parameter	Description	Acceptable Values

Parameter	Description	Acceptable Values
`r`	Temporary Droop [pu]	Any value
`Tr`	Governor Time Constant [s]
`Tf`	Filter Time Constant [s]
`Tg`	Servo Time Constant [s]
`Tw`	Water Starting Time [s]
`At`	Turbine Gain [pu]
`Dturb`	frictional losses factor pu [pu]
`qnl`	No Load Flow [pu]
`R`	Permanent Droop [pu]
`PN`	Turbine Rated Power (=0->PN=Pgnn) [Mw]
`Gmin`	Minimum Gate Limit [pu]
`Velm`	Gate Velocity Limit [pu]
`Gmax`	Maximum Gate Limit [pu]

gov_IEEEG1, gov_PSSE_IEEEG1

These PowerFactory components are mapped to the IEEEG1 component of the Native Library.

Parameters from ElmDsl Section

Parameter	Description	Acceptable Values

Parameter	Description	Acceptable Values
`K`	Controller Gain [pu]	Any value
`T1`	Governor Time Constant [s]
`T2`	Governor Derivative Time Constant [s]
`T3`	Servo Time Constant [s]
`K1`	High-Pressure Turbine Factor [pu]
`K2`	High-Pressure Turbine Factor [pu]
`T5`	Intermediate Pressure Turbine Time Constant [s]
`K3`	Intermediate Pressure Turbine Factor [pu]
`K4`	Intermediate Pressure Turbine Factor [pu]
`T6`	Medium Pressure Turbine Time Constant [s]
`K5`	Medium Pressure Turbine Factor [pu]
`K6`	Medium Pressure Turbine Factor [pu]
`T4`	High-Pressure Turbine Time Constant [s]
`T7`	Low-Pressure Turbine Time Constant [s]
`K7`	Low-Pressure Turbine Factor [pu]
`K8`	Low-Pressure Turbine Factor [pu]
`PNhp`	HP Turbine Rated Power (=0->PNhp=PgnnHp) [MW]
`PNlp`	LP Turbine Rated Power (=0->PNhp=Pgnnlp) [MW]
`Uc`	Valve Closing Time [pu/s]
`Pmin`	Minimum Gate Limit [pu]
`Uo`	Valve Opening Time [pu/s]
`Pmax`	Maximum Gate Limit [pu]

gov_IEEEG2, gov_PSSE_IEEEG2

These PowerFactory components are mapped to IEEEG2 turbine governor of the Native Library.

Parameters from ElmDsl Section

Parameter	Description	Acceptable Values

Parameter	Description	Acceptable Values
`K`	Controller Gain [pu]	Any value
`T1`	Governor Time Constant [s]
`T2`	Governor Derivative Time Constant [s]
`T3`	Servo Time Constant [s]
`T4`	Water Starting Time [s]
`PN`	Turbine Rated Power (=0→PN=Pgnn) [MW]
`Pmin`	Minimum Gate Limit [pu]
`Pmax`	Maximum Gate Limit [pu]

gov_IEESGO, gov_PSSE_IEESGO

These PowerFactory components are mapped to the IEEESGO component of the Native Library.

Parameters from ElmDsl Section

Parameter	Description	Acceptable Values

Parameter	Description	Acceptable Values
`T1`	Governor Time Constant [s]	Any value
`T2`	Governor Derivative Time Constant [s]
`K1`	Controller Gain [pu]
`T3`	Servo Time Constant [pu]
`T4`	Steam Chest & Inlet Piping Time Constant [s]
`K3`	Low-Pressure Turbine Factor [pu]
`T6`	Interm. & Low-Pressure Turbine Time Constant [s]
`K2`	High-Pressure Turbine Factor [pu]
`T5`	Reheater Time Constant [pu]
`PN`	Turbine Rated Power (=0→PN=Pgnn) [MW]
`Pmin`	Minimum Gate Limit [pu]
`Pmax`	Maximum Gate Limit [pu]

gov_TGOV1, gov_PSSE_TGOV1

These PowerFactory components are mapped the TGOV1 component of the Native Library.

Parameters from ElmDsl Section

Parameter	Description	Acceptable Values

Parameter	Description	Acceptable Values
`T3`	Turbine Delay Time Constant [s]	Any value
`T2`	Turbine Derivative Time Constant [s]
`At`	Turbine power coefficient [pu]
`Dt`	Frictional Losses Factor [pu]
`R`	Controller Droop [pu]
`T1`	Governor Time Constant [s]
`Vmin`	Minimum Gate Limit [pu]
`Vmax`	Maximum Gate Limit [pu]
`PN`	Turbine Rated Power (=0→PN=Pgnn) [MW]