TGOV3

TGOV3 model

This article is incomplete, some sections must be written.

Context

This governor model appears under the name GovSteamFV3 in the Common Information Model for Dynamics - Standard Models (2012) [1] and in the IEC 61970-302:2024 version [2].

Model use, assumptions, validity domain and limitations

To be completed

Model inputs and output

The input variables are :

Variable	Description	Units
\(fastValving\)	a Boolean which, if true, initiates the fast valving	-
\(\omega_{Pu}\)	measured angular frequency	\(pu\) (base \(\omega_{Nom}\))
\(\omega_{RefPu}\)	reference angular frequency	\(pu\) (base \(\omega_{Nom}\))
\(P_{mRefPu}\)	reference mechanical power	\(pu\) (base \(P_{NomTurb}\))

The output signal is \(P_{mPu}\), the mechanical power in \(pu\) (base \(P_{NomTurb}\)).

Model parameters

Parameter	Description	Units
\(K\)	Governor gain(reciprocal of droop)	\(pu\)
\(K_1\)	Fraction of HP shaft power after first boiler pass	-
\(K_2\)	Fraction of LP shaft power after first boiler pass	-
\(K_3\)	Fraction of HP shaft power after second boiler pass	-
\(P_{MaxPu}\)	Maximum valve opening	\(pu\) (base \(P_{NomTurb}\))
\(P_{MinPu}\)	Minimum valve opening	\(pu\) (base \(P_{NomTurb}\))
\(P_{rMaxPu}\)	Maximum pressure in reheater	\(pu\) (base \(P_{NomTurb}\))
\(t_1\)	Governor lag time constant	\(s\)
\(t_2\)	Governor lead time constant	\(s\)
\(t_3\)	Valve positioner time constant	\(s\)
\(t_4\)	Inlet piping / steam bowl time constant	\(s\)
\(t_5\)	Time constant of second boiler pass (reheater)	\(s\)
\(t_6\)	Time constant of crossover of third boiler pass	\(s\)
\(t_A\)	Time to close intercept valve	\(s\)
\(t_B\)	Time until intercept valve starts to reopen	\(s\)
\(t_C\)	Time until intercept valve is fully open	\(s\)
\(U_o\)	Maximum valve opening velocity	\(pu/s\)
\(U_c\)	Maximum valve closing velocity	\(pu/s\)

Model diagram

Figure 1: TGOV3 model diagram

Open source implementations

This model has been successfully implemented in :

Software	URL	Language	Open-Source License	Last consulted date	Comments
Dynawo	Link	Modelica	MPL v2.0	24/05/2024

References

1.

Commission IE (2012) Common information model (CIM) standard models 2012. https://doi.org/10.3403/30160442

2.

Commission IE (2024) Energy management system application program interface (EMS-API) part 302: Common information model (CIM) dynamics. IEC 61970-302