1 Description
2 Mask and Parameters
- 2.1 IEEEST Parameters
- 2.2 Initial Values
3 Inputs, Outputs and Signal Available for Monitoring
- 3.1 Inputs
- 3.2 Outputs
4 References

Description

This model is based on the PowerSystem Stabilizer (PSS) IEEEST from [1] and [2]. The architecture of the IEEEST is shown below.

Mask and Parameters

IEEEST Parameters

Expanding the “Block diagram” displays the IEEEST diagram in the parameters window.

Name	Description	Unit

Name	Description	Unit
Input Type	Type of Input (Reference from Input Types Table below)	-
A1, A2, A3, A4, A5, A6	Notch filter Parameters	-
T1, T3	Lead compensating time constants	s
T2, T4	Lag compensating time constants	s
T5, T6	Washout time constant	s
Ks	Stabilizer gains	-
Lsmax	Stabilizer maximum output	pu
Lsmin	Stabilizer minimum output	pu
Vcl	Stabilizer input Vct lower cutoff threshold	pu
Vcu	Stabilizer input Vct upper cutoff threshold	pu

The input of IEEEST can be of any type as mentioned above, based on the control requirements. For each type of input, the corresponding reference input is provided as given in the InputTypes Table.

Input Types Table

Input Type	Name	Description

Input Type	Name	Description
1	Rotor Speed (pu)	Reference speed (pu) w* of the Syn. generator.
2	Bus frequency (pu)	Reference frequency (pu) f* of the Syn. generator.
3	Generator electrical power on MBASE base (pu)	Reference Electrical power output (pu) Pe0* of the syn. generator.
4	Generator accelerating power (pu) = Pm – Pe0	Reference input = 0
5	Bus voltage (pu)	Reference voltage (pu) Vt*
6	Derivative of pu bus voltage	Reference input = 0

Initial Values

Name	Description	Unit

Name	Description	Unit
Input Reference	Reference to the input	-

Inputs, Outputs and Signal Available for Monitoring

Inputs

Name	Description	Unit

Name

Description

Unit

Input

The input is one of the following type:

Rotor Speed (pu)
Bus frequency (pu)
Generator Electrical Power in Gen MVA Base (pu)
Generator Accelerating Power (pu)
Bus Voltage (pu)
Derivative of pu bus voltage.

pu

Vct

Compensator terminal voltage of a remote bus for inputs 2, 5 & 6. This may be neglected if the threshold voltages Vcl & Vcu are zero.

pu

Outputs

Name	Description	Unit

Name	Description	Unit
Vs	Power system stabilizer model output	pu

References

[1] Siemens Industry, Inc. Siemens Power Technologies International, "PSS®E 34.2.0 MODEL LIBRARY," April 2017.
[2] IEEE, "IEEE Recommended Practice for Excitation System Models for Power System Stability Studies," IEEE Std 421.5-1992, pp. 1-56, 10 Aug. 1992.