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Thermal (Steam) Governors

Description

Input Parameters

 

Description

This component can represent one of five IEEE type thermal governor models:

The inputs to this component are per-unit speed w, per-unit speed reference Wref.  The output is the gate position z.  The outputs are the control valve flow area Cv and on GOV2, 3 and 5, the intercept valve flow area Iv.  Both of these outputs should be input to a corresponding Thermal Turbine.

 

 

More:

Governor Models

Thermal Governor Transfer Functions

PSCAD references [1], [2] and [3]

Input Parameters

ConfigurationConfiguration

 

 Name for Identification

  

Text

  

Optional text parameter for identification of the component.
         

 Thermal Governor Model

 

Choice

 

Select GOV1, GOV2, GOV3, GOV4 or GOV5 as described in Thermal Governor Transfer Functions

 

 

 

 

 

Gov/Turb Status => 0-Initialize; 1-Normal

 

INTEGER

Variable

A variable name can be used.  This variable can come from Output Variables for Controller Initialization section of the Synchronous Machine input parameters

 

 

 

 

 

CV Initial Value  (Same as Turbine)

 

REAL

Variable

Initial Value of Control Valve Flow Area [pu]

 

Gov1: Mechanical-Hydraulic GovernorGov1: Mechanical-Hydraulic Governor

NOTE:  See Thermal Governor Transfer Functions for more details.

 

 Dead Band Value

 

REAL

Constant

If the speed difference is less than the dead band value, then the 'error' input to the governor will be zero [pu]

 

 

 

 

 

Inverse of Droop (Kg)

 

REAL

Constant

Enter a value for the inverse of droop [pu]

 

 

 

 

 

Speed Relay Time Constant (TSR)

 

REAL

Constant

Enter a value for speed relay time constant [s]

 

 

 

 

 

Gate Servo Time Constant (TSM)

 

REAL

Constant

Enter a value for gate servo time constant [s]

 

 

 

 

 

Maximum Opening Rate (P_up)

 

REAL

Constant

Enter a value for maximum opening rate [pu/s]

 

 

 

 

 

Maximum Closing Rate (P_down)

 

REAL

Constant

Enter a value for maximum closing rate [pu/s]

 

 

 

 

 

Maximum Servo Position (Cmax)

 

REAL

Constant

Enter a value for the maximum servo position [pu]

 

 

 

 

 

Minimum Servo Position (Cmin)

 

REAL

Constant

Enter a value for the minimum servo position [pu]

 

Gov2: Mechanical-Hydraulic (Ge) Governor : Section 1Gov2: Mechanical-Hydraulic (Ge) Governor : Section 1

NOTE:  See Thermal Governor Transfer Functions for more details.

 

 Dead Band Value

 

REAL

Constant

If the speed difference is less than the dead band value, then the 'error' input to the governor will be zero [pu]

 

 

 

 

 

Permanent Droop (R)

 

REAL

Constant

Enter a value for the inverse of droop [pu]

 

 

 

 

 

Speed Relay Time Constant (TSR)

 

REAL

Constant

Enter a value for permanent droop [s]

 

 

 

 

 

Gate Servo Time Constant (TSM)

 

REAL

Constant

Enter a value for gate servo time constant [s]

 

 

 

 

 

Maximum CV Opening Rate (P_up)

 

REAL

Constant

Enter a value for maximum Cv opening rate [pu/s]

 

 

 

 

 

Maximum CV Closing Rate (P_down)

 

REAL

Constant

Enter a value for maximum Cv closing rate [pu/s]

 

 

 

 

 

Maximum CV Servo Position (Cmax)

 

REAL

Constant

Enter a value for the maximum Cv servo position [pu]

 

 

 

 

 

Minimum CV Servo Position (Cmin)

 

REAL

Constant

Enter a value for the minimum Cv servo position [pu]

 

 

 

 

 

IV Path Accelerator Gain (K1)

 

REAL

Constant

Enter a value for the Iv path position gain [pu]

 

 

 

 

 

IV Path Position Gain (K2)

 

REAL

Constant

Enter a value for the Iv path accelerator bias [pu]

 

Gov2: Mechanical-Hydraulic (Ge) Governor : Section 2Gov2: Mechanical-Hydraulic (Ge) Governor : Section 2

NOTE:  See Thermal Governor Transfer Functions for more details.

 

 IV Path Accelerator Bias (BIAS1)

 

REAL

Constant

Enter a value for the Iv path accelerator bias [pu]

 

 

 

 

 

IV Path Position Bias (BIAS2)

 

REAL

Constant

Enter a value for the Iv path position bias [pu]

 

 

 

 

 

Max. IV  Accelerator Value (Amax)

 

REAL

Constant

Enter a value for the maximum Iv accelerator value [pu]

 

 

 

 

 

Min. IV  Accelerator Value (Amin)

 

REAL

Constant

Enter a value for the minimum Iv accelerator value [pu]

 

 

 

 

 

IV Servo Time Constant (TSJ)

 

REAL

Constant

Enter a value for Iv servo time constant [s]

 

 

 

 

 

Maximum IV Opening Rate (I_up)

 

REAL

Constant

Enter a value for maximum Iv opening rate [pu/s]

 

 

 

 

 

Maximum IV Closing Rate (I_down)

 

REAL

Constant

Enter a value for maximum Iv closing rate [pu/s]

 

 

 

 

 

Maximum IV Servo Position (Imax)

 

REAL

Constant

Enter a value for the maximum Iv servo position [pu]

 

 

 

 

 

Minimum IV Servo Position (Imin)

 

REAL

Constant

Enter a value for the minimum Iv servo position [pu]

 

 

 

 

 

IV Initial Value: Variable (Same as Tur.)

 

REAL

Variable

Initial value of Intercept Valve Flow Area [pu]

 

Gov3: Electro-Hydraulic (Ge) Governor : Section 1Gov3: Electro-Hydraulic (Ge) Governor : Section 1

NOTE:  See Thermal Governor Transfer Functions for more details.

 

 Dead Band Value

 

REAL

Constant

If the speed difference is less than the dead band value, then the 'error' input to the governor will be zero [pu]

 

 

 

 

 

Permanent Droop (R)

 

REAL

Constant

Enter a value for the inverse of droop [pu]

 

 

 

 

 

Max value of Load

 

REAL

Constant

Enter a value for the maximum value of load [pu]

 

 

 

 

 

Gate Servo Time Constant (TSM)

 

REAL

Constant

Enter a value for gate servo time constant [s]

 

 

 

 

 

Maximum CV Opening Rate (P_up)

 

REAL

Constant

Enter a value for maximum Cv opening rate [pu/s]

 

 

 

 

 

Maximum CV Closing Rate (P_down)

 

REAL

Constant

Enter a value for maximum Cv closing rate [pu/s]

 

 

 

 

 

Maximum CV Servo Position (Cmax)

 

REAL

Constant

Enter a value for the maximum Cv servo position [pu]

 

 

 

 

 

Minimum CV Servo Position (Cmin)

 

REAL

Constant

Enter a value for the minimum Cv servo position [pu]

 

 

Gov3: Electro-Hydraulic (Ge) Governor : Section 2Gov3: Electro-Hydraulic (Ge) Governor : Section 2

NOTE:  See Thermal Governor Transfer Functions for more details.

 

 IV Path Position Gain (K2)

 

REAL

Constant

Enter a value for the Iv path position gain [pu]

 

 

 

 

 

IV Path Position Bias (BIAS2)

 

REAL

Constant

Enter a value for the Iv path position bias [pu]

 

 

 

 

 

IV Servo Time Constant (TSJ)

 

REAL

Constant

Enter a value for Iv servo time constant [s]

 

 

 

 

 

Maximum IV Opening Rate (I_up)

 

REAL

Constant

Enter a value for maximum Iv opening rate [pu/s]

 

 

 

 

 

Maximum IV Closing Rate (I_down)

 

REAL

Constant

Enter a value for maximum Iv closing rate [pu/s]

 

 

 

 

 

Maximum IV Servo Position (Imax)

 

REAL

Constant

Enter a value for the maximum Iv servo position [pu]

 

 

 

 

 

Minimum IV Servo Position (Imin)

 

REAL

Constant

Enter a value for the minimum Iv servo position [pu]

 

 

 

 

 

PLU Status => 0 = Off ; 1 = On

 

INTEGER

Variable

Enter 1 or 0 to control Power Load Unbalance (PLU) for fast valving:

  • 1:  Fast Valving in effect

  • 0:  Fast Valving not in effect.

 

 

 

 

 

IV Initial Value: Variable (Same as Tur.)

 

REAL

Variable

Initial value of Intercept Valve Flow Area [pu]

 

 

Gov4: Deh Controls (Westinghouse)Gov4: Deh Controls (Westinghouse)

NOTE:  See Thermal Governor Transfer Functions for more details.

 

 Dead Band Value

 

REAL

Constant

If the speed difference is less than the dead band value, then the 'error' input to the governor will be zero [pu]

 

 

 

 

 

Permanent Droop (R)

 

REAL

Constant

Enter a value for the inverse of droop [pu]

 

 

 

 

 

Speed Relay Lag Time Constant (T1)

 

REAL

Constant

Enter a value for speed relay lag time constant [s]

 

 

 

 

 

Speed Relay Lead Time Constant (T2)

 

REAL

Constant

Enter a value for speed relay lead time constant [s]

 

 

 

 

 

Gate Servo Time Constant (T3)

 

REAL

Constant

Enter a value for gate servo time constant [s]

 

 

 

 

 

Maximum  Opening Rate (P_up)

 

REAL

Constant

Enter a value for maximum opening rate [pu/s]

 

 

 

 

 

Maximum Closing Rate (P_down)

 

REAL

Constant

Enter a value for maximum closing rate [pu/s]

 

 

 

 

 

Maximum Servo Position (Cmax)

 

REAL

Constant

Enter a value for the maximum servo position [pu]

 

 

 

 

 

Minimum Servo Position (Cmin)

 

REAL

Constant

Enter a value for the minimum servo position [pu]

 

 

Gov5: Electro-Hydraulic (Parson's) ControlsGov5: Electro-Hydraulic (Parson's) Controls

NOTE:  See Thermal Governor Transfer Functions for more details.

 

 Transducer Time Constant (TR)

 

REAL

Constant

Enter a value for transducer time constant [s]

 

 

 

 

 

Dead Band Value

 

REAL

Constant

If the speed difference is less than the dead band value, then the 'error' input to the governor will be zero [pu]

 

 

 

 

 

Permanent Droop (R)

 

REAL

Constant

Enter a value for the inverse of droop [pu]

 

 

 

 

 

Threshold Speed Deviation for Overspeed

 

REAL

Constant

Enter a value for the speed deviation threshold for over-speed [pu]

 

 

 

 

 

Overspeed Droop

 

REAL

Constant

Enter a value for over-speed droop [pu]

 

 

 

 

 

Max value of Overspeed Limit

 

REAL

Constant

Enter a value for the maximum over-speed limit [pu]

 

 

 

 

 

Min value of Overspeed Limit

 

REAL

Constant

Enter a value for the minimum over-speed limit [pu]

 

 

 

 

 

Max Load Limit

 

REAL

Constant

Enter a value for the maximum load limit [pu]

 

 

 

 

 

CV Phase Compensation Lead Time T1

 

REAL

Constant

Enter a value for the Cv phase compensation lead-time [s]

 

 

 

 

 

CV Phase Compensation Lag Time T2

 

REAL

Constant

Enter a value for the Cv phase compensation lag-time [s]

 

 

 

 

 

Gate Servo Time Constant (TSM)

 

REAL

Constant

Enter a value for gate servo time constant [s]

 

 

 

 

 

Maximum CV Opening Rate (P_up)

 

REAL

Constant

Enter a value for maximum Cv opening rate [pu/s]

 

 

 

 

 

Maximum CV Closing Rate (P_down)

 

REAL

Constant

Enter a value for maximum Cv closing rate [pu/s]

 

 

 

 

 

Maximum CV Servo Position (Cmax)

 

REAL

Constant

Enter a value for the maximum Cv servo position [pu]

 

 

 

 

 

Minimum CV Servo Position (Cmin)

 

REAL

Constant

Enter a value for the minimum Cv servo position [pu]

 

 

Gov5: Parson's Iv ControlsGov5: Parson's Iv Controls

NOTE:  See Thermal Governor Transfer Functions for more details.

 

IV Path Position Bias (IVOB)

 

REAL

Constant

Enter a value for the Iv path position bias [pu]

 

 

 

 

 

IV Phase Compensation Lead Time T3

 

REAL

Constant

Enter a value for the Iv phase compensation lead-time [s]

 

 

 

 

 

IV Phase Compensation Lag Time T4

 

REAL

Constant

Enter a value for the Iv phase compensation lag-time [s]

 

 

 

 

 

IV Servo Time Constant (TSJ)

 

REAL

Constant

Enter a value for Iv servo time constant [s]

 

 

 

 

 

Maximum IV Opening Rate (I_up)

 

REAL

Constant

Enter a value for maximum Iv opening rate [pu/s]

 

 

 

 

 

Maximum IV Closing Rate (I_down)

 

REAL

Constant

Enter a value for maximum Iv closing rate [pu/s]

 

 

 

 

 

Maximum IV Servo Position (Imax)

 

REAL

Constant

Enter a value for the maximum Iv servo position [pu]

 

 

 

 

 

Minimum IV Servo Position (Imin)

 

REAL

Constant

Enter a value for the minimum Iv servo position [pu]

 

 

 

 

 

IV Initial Value: Variable (Same as Tur.)

 

REAL

Variable

Initial value of Intercept Valve Flow Area [pu]