OpenIPSL.NonElectrical.Nonlinear

Blocks that are described with nonlinear equations

Information

Extends from Modelica.Icons.Package (Icon for standard packages).

Package Content

Name	Description
CeilingBlock	Implements the ceiling function primarily found inside AVRs.
Deadband1	Deadband with error step
Deadband2	Simple deadband
Div0block	Block that implements division by zero protection
FEX	FEX=f(IN)
FrequencyCalc	Frequency deviation calculation from a rotating phasor
SaturationBlockTan	Block 1 in the OEL to decide the input signal of MIN Gate

OpenIPSL.NonElectrical.Nonlinear.CeilingBlock

Implements the ceiling function primarily found inside AVRs.

Information

Extends from Modelica.Blocks.Interfaces.SISO (Single Input Single Output continuous control block).

Parameters

Name	Description
Ae	First ceiling coefficient
Be	Second ceiling coefficient

Connectors

Name	Description
u	Connector of Real input signal
y	Connector of Real output signal

OpenIPSL.NonElectrical.Nonlinear.Deadband1

Deadband with error step

Information

Extends from Modelica.Blocks.Interfaces.SISO (Single Input Single Output continuous control block).

Parameters

Name	Description
db	Deadband
err	Step

Connectors

Name	Description
u	Connector of Real input signal
y	Connector of Real output signal

OpenIPSL.NonElectrical.Nonlinear.Deadband2

Simple deadband

Information

Extends from Modelica.Blocks.Interfaces.SISO (Single Input Single Output continuous control block).

Parameters

Name	Description
db	Deadband

Connectors

Name	Description
u	Connector of Real input signal
y	Connector of Real output signal

OpenIPSL.NonElectrical.Nonlinear.Div0block

Block that implements division by zero protection

Information

Extends from Modelica.Blocks.Interfaces.SI2SO (2 Single Input / 1 Single Output continuous control block).

Connectors

Name	Description
u1	Connector of Real input signal 1
u2	Connector of Real input signal 2
y	Connector of Real output signal

OpenIPSL.NonElectrical.Nonlinear.FEX

FEX=f(IN)

Connectors

Name	Description
u
y

OpenIPSL.NonElectrical.Nonlinear.FrequencyCalc

Frequency deviation calculation from a rotating phasor

Information

This block uses the real and imaginary components of a Cartesian representation of a voltage phasor to estimate the electrical frequency deviation from nominal value present at the node.

    Vr*der(Vi) - Vi*der(Vr)
f = -----------------------
          Vr^2 + Vi^2

The calculations are done using the filtered derivative of the real and imaginary parts of the phasor representation. The user is required to set proper values for initialization of the calculations, together with a smoothing filter time constant, used to filter the derivative components.

Note

The calculated frequency is just an estimate and can deviate by a certain margin of error.

Parameters

Name	Description
start_guess
real_start	Phasor initial real part
imag_start	Phasor initial imaginary part
Ts	Smoothing filter time constant [s]

Connectors

Name	Description
real_part
y	O/P is in rad/sec
imag_part

OpenIPSL.NonElectrical.Nonlinear.SaturationBlockTan

Block 1 in the OEL to decide the input signal of MIN Gate

Information

Parameters

Name	Description
r	Exiciter parameter
f	Exiciter parameter

Connectors

Name	Description
p1
n1

Automatically generated Thu Feb 26 06:56:12 2026.