PSS2B

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.
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 (speed or frequency)
VSI2	Input (pu)	Power system stabilizer model input (electrical power)
VST	Output (pu)	Power system stabilizer model output

Parameters

PSS2B - mask parameters

PSS2B Block diagram

Name	Unit	Description
T1, T3, T10	s	PSS lead compensating time constant
T2, T4, T11	s	PSS lag compensating time constant
Tw1, Tw2, Tw3, Tw4	s	PSS washout time constant
T6	s	Transducer time constant
T7	s	Transducer time constant
M, N	-	Integer filter constant
Ks1, Ks2, Ks3	-	PSS gains
VSI1max	pu	Maximum input 1
VSI1	pu	Minimum input 1
VSI2	pu	Maximum input 2
VSI2	pu	Minimum input 2
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 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:

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