VariableImpedance

Polyphase variable impedance

    VariableImpedance

Library

Modelica/Electrical/QuasiStatic/Polyphase/Basic

Description

The impedance model represents a series connection of a resistor and either an inductor or capacitorin each phase.

The linear impedance connects the complex voltage v with thecomplex current i by i*Z = v in each phase,using mvariable single-phase impedances.The impedances Z_ref = R_ref + j*X_ref are given as complex input signals, representing theresistive and reactive components of the input impedances. The resistivecomponents are modeled temperature dependent, so the real part R_actual = real(Z) are determined fromthe actual operating temperatures and the reference input resistances real(Z_ref).Conditional heat ports are considered.The reactive components X_actual = imag(Z)are 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 reactances X_actual are proportional to f/f_ref
(b) imag(Z_ref) < 0: capacitive case
The actual reactances X_actual are proportional to f_ref/f

Note

Zero crossings of the real or imaginary parts of the impedance signals Z_ref could causesingularities due to the actual structure of the connected network.

See also

VariableResistor,Resistor,Conductor,Capacitor,Inductor,Impedance,Admittance,Variable conductor,Variable capacitor,Variable inductorVariable admittance

Parameters

VariableImpedance_0

NameLabelDescriptionData TypeValid Values

mo_m

m

Number of phases

Scalar

mo_T_ref

T_ref

Reference temperatures

Vector

mo_alpha_ref

alpha_ref

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

Vector

mo_mh

mh

Number of heatPorts=number of phases

Scalar

mo_useHeatPort

useHeatPort

= true, if all heat ports are enabled

Number

0
1

mo_T

T

Fixed device temperatures if useHeatPort = false

Vector

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

'omega'
'abs_v'
'arg_v'
'abs_i'
'arg_i'
'P'
'P_total'
'Q'
'Q_total'
'S'
'S_total'
'pf'

mo__modifiers/attribute

Attribute

Cell of strings

'start'
'fixed'

mo__modifiers/value

Value

Ports

NameTypeDescriptionIO TypeNumber

plug_p

implicit

Positive quasi-static polyphase plug

input

1

plug_n

implicit

Negative quasi-static polyphase plug

output

1

Z_ref

implicit

Variable complex impedances

input

2

Port 4

implicit

Conditional heat ports

input

mo_useHeatPort

See Also