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This module is based on the IEEE std 412.5 type PSS3B excitation system model. A detailed
explanation can be found in [1].

Exciter model overview
The block diagram of this Power System Stabilizer PSS3B has a dual input of electrical power and the 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 (electrical power)
VSI2Input (pu)Power system stabilizer model input (speed or frequency)
VSTOutput (pu)

Power system stabilizer model output


PSS3B mask parameters

80 Block diagram PSS3B

A1, A2-Numerator coefficients (first block)
A3, A4-Denominator coefficients (first block)
A5, A6-Numerator coefficients (second block)
A7, A8-Denominator coefficients (second block)
T1, T2sTransducer time constants
Tw1, Tw2, Tw3sWashout time constants
Ks1, Ks2-PSS gains
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 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.

PSS3B Initialization

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

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