PSS1A

This module is based on the IEEE std 412.5 type PSS1A excitation system model. A detailed explanation can be found in [1].

Exciter model overview
The Power System Stabilizer PSS1A block has a single input.
Input/output
The inputs and outputs for this model are described in Table 1.

I/O Name	Type (unit)	Description
VSI	Input (pu)	Power system stabilizer model input
VST	Output (pu)	Power system stabilizer model output

Parameters

PSS1A Parameters

PSS1A Block diagram

Name	Unit	Description
A1, A2	-	PSS signal conditioning frequency filter constants
T1, T3	s	PSS lead compensating time constant
T2, T4	s	PSs lag compensating time constant
T5	s	PSS washout time constant
T6	s	Transducer time constant
Ks	-	PSS gain
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.
Types of inputs
The power system stabilizer PSS1A allows inputs from speed, speed deviation, frequency, frequency deviation, electrical power and power deviation.