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PSS2A

The PSS2A model was developed in line with the references [1] [2]. Figure 1 shows the architecture of the PSS2A model. PSS2A is a dual-input stabilizer. This model can represent a variety of stabilizers with inputs of power, speed, or frequency [1].

Symbol

Mask parameters



Name

Description

Unit

Hard coded parameter range

T1, T3

PSS lead compensating time constant

s

-

T2, T4

PSS lag compensating time constant

s

-

Tw1, Tw2, Tw3, Tw4

PSS washout time constant

s

-

T6

Transducer time constant

s

-

T7

Transducer time constant

s

-

T8

Lead time constant of ramp tracking filter

s

-

T9

Lag time constant of ramp tracking filter

s

-

M, N

Ramp tracking filter constant

-

0≤M≤5

0≤N≤4

M, N are integers

Ks1, Ks2, Ks3

PSS gains

-

-

VSTmax

Maximum PSS output

pu

-

VSTmin

Minimum PSS output

pu

-

W0

Rotor speed/frequency reference (Wref in the diagram)

pu

-

Pe0

Electrical active power reference (Pref in the diagram)

pu

-

For all transfer functions, the degree of the numerator must be less than or equal to the denominator. The user must be aware of this restriction at all times.


The parameters Pe0 and W0 can be set manually by entering a numerical value. It can also be set automatically based on load flow calculations, by entering a referenced synchronous machine variable.
For instance, if the name of the synchronous machine in the genunit to which the stabilizer is connected is “SM1”, then Pe0 and W0 shall be set respectively as “=SM1.Peo/SM1.BaseMVA” and “=SM1.wo” if a thermal machine or a hydraulic machine is used, and as "=SM1.lfP/1e6/SM1.sBase" and "=SM1.Wm_Init" if a pu standard or pu fundamental machine is used. For example:


The HYPERSIM® simulation option “Set Initial Conditions” must be checked for the automatic initialization to work properly.

Input/Output signals

NameDescription

Type 

VSI1

Power system stabilizer model input (speed or frequency)

Input 

VSI2

Power system stabilizer model input (electrical power)

Input 

VST

Power system stabilizer model output

Output 

Sensor descriptions

NameDescription

Unit

VSI1

Power system stabilizer model input (speed or frequency)

pu

VSI2

Power system stabilizer model input (electrical power)

pu

VST

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. 


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