Turbine Governors

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Note:

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. Their values must be set to PN = 0 and At = 1.
The governors that have gov_ prefixes are from the PSSE compatible library in PowerFactory 2022 and prior versions. Comparatively, the governors that have gov_PSSE_ prefixes are from the PSSE compatible library in PowerFactory 2023 and more recent versions.

The version of the Governor components can be determined using the following pattern:

Version	Type Prefixes
PowerFactory 2022 and prior versions	Governors: gov_
PowerFactory 2023 and more recent versions	Governors: 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
`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
`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
`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
`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
`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
`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
`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]