VariableImpedance

Single phase variable impedance

    VariableImpedance

Library

Modelica/Electrical/QuasiStationary/SinglePhase/Basic

Description

The impedance model represents a series connection of a resistor and either an inductor or capacitor.

The linear impedance connects the complex voltage v with thecomplex current i by i*Z = v.The impedance Z_ref = R_ref + j*X_ref is given as complex input signal, representing theresistive and reactive component of the input impedance. The resistivecomponent is modeled temperature dependent, so the real part R_actual = real(Z) is determined fromthe actual operating temperature and the reference input resistance real(Z_ref).The reactive component X_actual = imag(Z)is equal to imag(Z_ref) if frequencyDependent = false.Frequency dependency is considered by frequencyDependent = true, distinguishing two cases:

(a) imag(Z_ref) > 0: inductive case
The actual reactance X_actual is proportional to f/f_ref
(b) imag(Z_ref) < 0: capacitive case
The actual reactance X_actual is proportional to f_ref/f

Note

A zero crossing of the real or imaginary part of the impedance signal Z_ref could causesingularities due to the actual structure of the connected network.

See also

Resistor,Conductor,Capacitor,Inductor,Impedance,Admittance,Variable resistor,Variable conductor,Variable capacitor,Variable inductor,Variable admittance

Parameters

VariableImpedance_0

NameLabelDescriptionData TypeValid Values

mo_T_heatPort

T_heatPort

T_heatPort

Structure

mo_T_heatPort/fixed

fixed

Cell of scalars

true
false

mo_T_heatPort/start

start

Cell of scalars

mo_T_ref

T_ref

Reference temperature

Scalar

mo_alpha_ref

alpha_ref

Temperature coefficient of resistance (R_actual = R_ref*(1 + alpha_ref*(heatPort.T - T_ref))

Scalar

mo_useHeatPort

useHeatPort

=true, if heatPort is enabled

Number

0
1

mo_T

T

Fixed device temperature if useHeatPort = false

Scalar

mo_frequencyDependent

frequencyDependent

Consider frequency dependency, if true

Scalar

true
false

mo_f_ref

f_ref

Reference frequency, if frequency dependency is considered

Scalar

VariableImpedance_1

NameLabelDescriptionData TypeValid Values

mo__nmodifiers

Number of Modifiers

Specifies the number of modifiers

Number

mo__modifiers

Modifiers

Add new modifier

Structure

mo__modifiers/varname

Variable name

Cell of strings

'abs_v'
'arg_v'
'abs_i'
'arg_i'
'P'
'Q'
'S'
'pf'
'omega'
'LossPower'
'R_actual'
'X_actual'
'R_ref'
'X_ref'

mo__modifiers/attribute

Attribute

Cell of strings

'start'
'fixed'

mo__modifiers/value

Value

Ports

NameTypeDescriptionIO TypeNumber

pin_p

implicit

Positive quasi-static single-phase pin

input

1

pin_n

implicit

Negative quasi-static single-phase pin

output

1

Z_ref

implicit

Variable complex impedance

input

2

Port 4

implicit

Conditional heat port

input

mo_useHeatPort

See Also