PSS3B

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.
Input/output
This model’s inputs and outputs are described in the following table.

I/O name	Type (unit)	Description
VSI1	Input (pu)	Power system stabilizer model input (electrical power)
VSI2	Input (pu)	Power system stabilizer model input (speed or frequency)
VST	Output (pu)	Power system stabilizer model output

Parameters

PSS3B mask parameters

80 Block diagram PSS3B

Name	Unit	Description
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, T2	s	Transducer time constants
Tw1, Tw2, Tw3	s	Washout time constants
Ks1, Ks2	-	PSS gains
VSTmax	pu	Maximum PSS output
VSTmin	pu	Minimum 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.