PSS6C

PSS6C model

This article is incomplete, some sections must be written.

Context

This power system stabilizer model first appeared in the IEEE Std 421.5-2016 [1]. It has been reproduced identically 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
\(\omega_{pu}\)	measured angular frequency	\(pu\) (base \(\omega_{Nom}\))
\(\omega_{RefPu}\)	reference angular frequency	\(pu\) (base \(\omega_{Nom}\))
\(P_{GenPu}\)	active power	\(pu\) (base \(S_{nRef}\))

The output signal is \(VPssPu\) in \(pu\) (base \(U_{Nom}\)).

Model parameters

Parameter	Description	Units
\(K_{\Omega}\)	Coefficient applied to angular frequency	-
\(K_{\Omega Ref}\)	Coefficient applied to reference angular frequency	-
\(K_{0}\)	Gain of first integrator input	\(pu\)
\(K_{1}\)	Gain of first integrator output	\(pu\)
\(K_{2}\)	Gain of second integrator output	\(pu\)
\(K_{3}\)	Gain of third integrator output	\(pu\)
\(K_{4}\)	Gain of fourth integrator output	\(pu\)
\(K_{i3}\)	Gain of third integrator	\(pu\)
\(K_{i4}\)	Gain of fourth integrator	\(pu\)
\(K_{s}\)	Gain of power system stabilizer	\(pu\)
\(K_{s1}\)	Gain of active power branch	\(pu\)
\(K_{s2}\)	Gain of angular frequency branch	\(pu\)
\(M_{Acc}\)	Gain of angular velocity	\(pu\)
\(\Omega_{MaxPu}\)	Maximum angular velocity	\(pu\) (base \(\omega_{Nom}\))
\(\Omega_{MinPu}\)	Minimum angular velocity	\(pu\) (base \(\omega_{Nom}\))
\(P_{GenMaxPu}\)	Maximum active power	\(pu\) (base \(S_{Nom}\)) (generator convention)
\(P_{GenMinPu}\)	Minimum active power	\(pu\) (base \(S_{Nom}\)) (generator convention)
\(PPssOffPu\)	Lower active power threshold for PSS activation	\(pu\) (base \(S_{Nom}\)) (generator convention)
\(PPssOnPu\)	Higher active power threshold for PSS activation	\(pu\) (base \(S_{Nom}\)) (generator convention)
\(t1\)	Transducer time constant (active power branch)	\(s\)
\(t2\)	Transducer time constant (angular frequency branch)	\(s\)
\(t3\)	First order time constant (active power branch)	\(s\)
\(t4\)	Derivative time constant (angular frequency branch)	\(s\)
\(tD\)	Washout time constant	\(s\)
\(tI1\)	Time constant of first integrator,	\(s\)
\(tI2\)	Time constant of second integrator,	\(s\)
\(tI3\)	Time constant of third integrator,	\(s\)
\(tI4\)	Time constant of fourth integrator,	\(s\)
\(VPssMaxPu\)	Maximum output voltage of power system stabilizer	\(pu\) (base \(U_{Nom}\))
\(VPssMinPu\)	Minimum output voltage of power system stabilizer	\(pu\) (base \(U_{Nom}\))
\(S_{Nom}\)	Nominal apparent power	\(MVA\)

Model diagram

Figure 1: PSS6C

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