Description

The block diagram for the governor/turbine system model presents a governor action, reheater time constant, and the ration of high-pressure turbine, with fast valving action.

Mask and Parameters

AVR parameters

TGOV2 mask parameters

Expanding the "Block diagram for TGOV2" displays the block diagram in the parameters window.

Block diagram TGOV2

Name	Description	Unit
R	Permanent droop	pu/pu
Dt	Turbine damping coefficient	pu
T1	Steam bowl time constant 1	s
T3	Time constant 3	s
K	Governor gain	pu
TT	Valve time constant	s
Vmax	Maximum valve position	pu
Vmin	Minimum valve position	pu
Fast valving parameters	[TI TA TB TC] *	s

* The T1 parameter should remain at zero, to have a reference in the x-axes.

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
Tmech	mechanical torque output	pu