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.