BBSEX1

BBSEX1 model

Context

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

It represents a static excitation system in which a gated thyristor bridge fed by a transformer at the main generator terminals feeds the main generator directly.

Model use, assumptions, validity domain and limitations

To be completed

Model inputs and output

The input variables are :

Variable	Description	Units
\(U_s P_u\)	measured stator voltage	\({pu}\) (base \(U_{Nom}\))
\(U_{s} R_{ef} P_u\)	reference stator voltage	\({pu}\) (base \(U N_{om}\))
\(U_{Oel} P_u\) (optional)	output voltage of overexcitation limiter	\({pu}\) (base \(U N_{om}\))
\(U P_{ss} P_u\) (optional)	output voltage of power system stabilizer	\({pu}\) (base \(U N_{om}\))
\(U U_{el} P_u\) (optional)	output voltage of underexcitation limiter	\({pu}\) (base \(U N_{om}\))

The output signal is \(E_{fd} P_u\), the excitation voltage in \(pu\) (user-selected base voltage).

Model parameters

Parameter	Description	Units
\(E_{fd} Max P_u\)	Maximum excitation voltage	\({pu}\) (user-selected base voltage)
\(E_{fd} Min P_u\)	Minimum excitation voltage	\({pu}\) (user-selected base voltage)
\(K\)	Voltage regulator gain	\({pu}\)
\(t_1\)	Voltage regulator first time constant	\({s}\)
\(t_2\)	Voltage regulator second time constant	\({s}\)
\(t_3\)	Voltage regulator lead time constant	\({s}\)
\(t_4\)	Voltage regulator lag time constant	\({s}\)
\(t_R\)	Stator voltage filter time constant	\({s}\)
\(V_{r} Max P_u\)	Maximum output voltage of voltage regulator	\({pu}\) (user-selected base voltage)
\(V_{r} Min P_u\)	Minimum output voltage of voltage regulator	\({pu}\) (user-selected base voltage)

Model diagram

Figure 1: BBSEX1 block 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