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IEEEG1
Description
IEEEG1 is a steam turbine-governor model implemented in line with references [1] and [2].
Mask and Parameters
IEEEG1 Parameters
Expanding the "Block diagram" displays the block diagram in the parameters window.
Name | Description | Unit |
---|---|---|
K | Governor gain (recirpocal of droop) | pu |
T1 | Governor lag time constant | s |
T2 | governor lead time constant | s |
T3 (> 0) | Valve positioner time constant | s |
Uo | Maximum valve opening velocity | pu/s |
Uc (< 0.) | Maximum valve closing velocity | pu/s |
Pmax | Maximum valve opening, (pu of mwcap) | pu of mwcap |
Pmin | Minimum valve opening, (pu of mwcap) | pu of mwcap |
T4 | High pressure turbine bowl time constant | s |
K1 | Fraction of hp shaft power after first boiler pass |
|
K2 | Fraction of lp shaft power after first boiler pass |
|
T5 | Reheater time constant | s |
K3 | Fraction of hp shaft power after second boiler pass |
|
K4 | Fraction of lp shaft power after second boiler pass |
|
T6 | Crossover time constant | s |
K5 | Fraction of hp shaft power after third boiler pass |
|
K6 | Fraction of lp shaft power after third boiler pass |
|
T7 | Double reheat time constant | s |
K7 | Fraction of hp shaft power after fourth boiler pass |
|
K8 | Fraction of lp shaft power after fourth boiler pass |
|
Initial Values Tab
Name | Unit | Description |
---|---|---|
Pm0_hp | pu | Initial mechanical power output of the machine connected to the HP pressure shaft power |
Pm0_lp | pu | Initial mechanical power output of the machine connected to the LP pressure shaft power |
The initial values parameters can be set manually, by entering a numerical value. They can also be set automatically based on load flow calculations, by entering a referenced synchronous machine variable. For instance, if the name of the synchronous machine on which the governor/turbine HP output is connected is “SM1”, then the value of Pm0_hp should be inserted as follow:
Pm0_hp | pu | SM1.lfP/1e6/SM1.sBase+3*SM1.Rs*((sqrt(SM1.lfP^2+SM1.lfQ^2)/1e6/SM1.sBase)/sqrt(3)/SM1.lfVolt)^2 |
if the name of the synchronous machine on which the governor/turbine LP output is connected is “SM2”, then the value of Pm0_lp should be inserted as follow:
Pm0_lp | pu | SM2.lfP/1e6/SM2.sBase+3*SM2.Rs*((sqrt(SM2.lfP^2+SM2.lfQ^2)/1e6/SM2.sBase)/sqrt(3)/SM2.lfVolt)^2 |
The HYPERSIM simulation option “Set Initial Conditions” must be checked for the automatic initialization to work properly.
Inputs and Outputs and Additional Signal Available for Monitoring
Inputs
I/O name | Description | Unit |
---|---|---|
w | Machine actual speed | pu |
VAR | Variation of the external power reference. (The reference value is internally assigned and corresponds to the mechanical power Initial condition obtained from the Load flow). | pu |
Outputs
I/O name | Description | Unit |
---|---|---|
Pm_HP | High pressure shaft power | pu |
Pm_LP | Low Pressure shaft power | pu |
References
[1] PSS®E 34.2.0 Model Library. NY, USA: Siemens Industry, Inc., 2017.
[2] Power System Dynamic Performance Committee , “Dynamic Models for Turbine-Governors in Power System Studies.”, IEEE Power & Energy Society , Jan. 2013.
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