Description

This model is the Westinghouse digital governor for gas turbines. The WESGOV component was developed in line with the reference [1].

Mask and Parameters

WEHGOV Parameters

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

Name	Description	Unit	Variable = {Possible Values}
delTC	The sample period for the speed measurement	s	-
delTP	The sample period for the electrical power measurement	s	-
Droop	Power droop	pu	-
KP	Controller proportional gain	-	-
TI	Controller integral time constant	s	-
T1	Actuator time constant	s	-
T2	Actuator time constant	s	-
Alim	Maximum change between samples	pu	-
TPE	Electrical power transducer time constant	s	-

Initial Values Tab

Name	Description	Unit	Variable = {Possible Values}
Pm0	Initial mechanical power output	pu	--
w0	Speed reference	pu	--

The speed reference can be set manually, by entering a numerical value. 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 same goes for the initial power output of the machine Pm0. Pm0 shall be set as =SM1.Peo/SM1.BaseMVA, if a thermal machine or a hydraulic machine is used, and as "=SM1.lfP/1e6/SM1.sBase" if a pu standard or a pu fundamental machine is used, where Peo and IfP are the initial power outputs of the machines, respectively.

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

I/O name	Description	Unit
w	Machine actual speed	pu
Ref	External control reference	pu
Pe	Measured electrical power	pu

Outputs

I/O name	Description	Unit
Pm	Mechanical power output	Output

References

[1] PSS®E 34.2.0 Model Library. NY, USA: Siemens Industry, Inc., 2017.