Description

The block diagram of Governor/Turbine system model. This model present a governor action, reheater time constant, and the ratio of high-pressure turbine.

Mask and Parameters

Exciter Parameters

TGOV1 mask parameters

Expanding the "Block diagram" displays the block diagram in the parameters window.

Block diagram TGOV1

Name	Description	Unit
Dt	Turbine damping coefficient	pu
R	Permanent droop	pu/pu
T1	Steam bowl time constant 1	s
T2	Time constant 2	s
T3	Time constant 3	s
Vmax	Maximum valve position	pu
Vmin	Minimum valve position	pu
W0*	Speed reference	pu

*The speed reference can be set manually, by entering a numerical value in the W0 field of the parameters window. It can also be set automatically based on load flow calculations, by entering a referenced synchronous machine variable.

Machine variables can be found in the machine netlist. For instance, if the name of the synchronous machine on which the governor/turbine is connected is “SM1”, then the speed reference should be inserted as “=SM1.wo” if a thermal machine or a hydraulic machine is used, and as "=SM1.Wm_Init" if a pu standard or pu fundamental machine is used.

The HYPERSIM simulation option Set Initial Conditions must be checked for the automatic initialization to work properly.

Inputs and Outputs and Additional Signals Available for Monitoring

Inputs

Name	Description	Unit
SpeedFreq	Speed or Frequency input	pu
Pref	Reference electrical power	pu

Outputs

Name	Description	Type
Tmec	Mechanical Torque Output	pu