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This module is an implementation based on the IEEE std 412.5 type PSS2B excitation system model.

Exciter model overview
The Power System Stabilizer PSS2B block diagram has dual inputs of electrical power and frequency deviation.
This model’s inputs and outputs are described in the following table.

I/O NameType (unit)Description
VSI1Input (pu)Power system stabilizer model input (speed or frequency)
VSI2Input (pu)Power system stabilizer model input (electrical power)
VSTOutput (pu)Power system stabilizer model output


PSS2B - mask parameters

PSS2B Block diagram

T1, T3, T10sPSS lead compensating time constant
T2, T4, T11sPSS lag compensating time constant
Tw1, Tw2, Tw3, Tw4sPSS washout time constant
T6sTransducer time constant
T7sTransducer time constant
M, N-Integer filter constant
Ks1, Ks2, Ks3-PSS gains
VSI1maxpuMaximum input 1
VSI1puMinimum input 1
VSI2puMaximum input 2
VSI2puMinimum input 2
VSTmaxpuMaximum PSS output
VSTminpuMinimum PSS output

Additional notes
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 to 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:

PSS2B initialization

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

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