Description

HYGOV is the hydro turbine-governor model implemented in line with references [1-3].

Mask and Parameters

HYGOV Parameters

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

Name	Description	Unit	Variable = {Possible Values}
R	Permanent droop	pu	0 < R < 0.1
r	Temporary droop	pu	0 < r < 2.0
VELM	Gate velocity limit	pu/s	--
GMAX	Maximum gate opening limit	pu	0 < GMAX ≤ 1.0
GMIN	Minimum gate opening limit	pu	0 ≤ GMIN < 1.0
TR	Governor time constant	s	0.04 < TR < 30
TF	Filter time constant	s	0.04 < TF < 0.1
TG	Servo time constant	s	0.04 < TG < 1.0
TW	Water time constant	s	>0.04
At	Turbine gain	pu	--
Dturb	Turbine damping	pu	--
qNL	No-load flow	pu	--

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 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
VAR	External control reference	pu

Outputs

I/O name	Description	Unit
Gate_p	Gate position	pu
Pm	Mechanical power output	pu

References

[1] P. Kundur, Power System Stability and Control, New York:McGraw-Hill, 1994.

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

[3] T. Tshibungu and J. Mahseredjian, Exciters and Governors: Governor-Turbine HYGOV. EMTP-EMTPWorks, 2016.