1 Description
2 Mask and Parameters
- 2.1 IEEEG1 Parameters
- 2.2 Initial Values Tab
- 2.3 Inputs and Outputs and Additional Signal Available for Monitoring
  - 2.3.1 Inputs
  - 2.3.2 Outputs
3 References

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

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

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

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

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.