PSS1A

PSS1A model

This article is incomplete, some sections must be written.

Context

This power system stabilizer model appears in the IEEE Std 421.5-2016 [1]. It has been reproduced identically in the IEC 61970-302:2024 version [2]. This model was introduced in the previous standard version (2005).

Model use, assumptions, validity domain and limitations

To be completed

Model input and output

The input variables are either :

Variable	Description	Units
\(\omega_{pu}\)	measured angular frequency	pu (base \(\omega_{Nom}\))
\(P_{GenPu}\)	active power	pu (base \(S_{nRef}\))

The output signal is VPssPu in pu (base UNom).

Model parameters

Parameter	Description	Units
\(A1\)	First coefficient of notch filter	\(s\)
\(A2\)	Second coefficient of notch filter	\(s ^ 2\)
\(Ks\)	Gain of power system stabilizer	\(pu\)
\(t1\)	First lead time constant	\(s\)
\(t2\)	First lag time constant	\(s\)
\(t4\)	Second lag time constant	\(s\)
\(t5\)	Washout time constant	\(s\)
\(t6\)	Transducer time constant	\(s\)
\(VPssMaxPu\)	Maximum voltage output of power system stabilizer	pu (base \(U_{Nom}\))
\(VPssMinPu\)	Minimum voltage output of power system stabilizer	pu (base \(U_{Nom}\))
\(S_{Nom}\)	Nominal apparent power	MVA (only if \(P_{GenPu}\) is the input signal)

Model diagram

Figure 1: PSS1A

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.

Electrical TI of, Engineers E (2016) IEEE recommended practice for excitation system models for power system stability studies. IEEE Std 4215-2016

2.

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