VariableImpedanceSingle phase variable impedance 
This information is part of the Modelica Standard Library maintained by the Modelica Association.
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 the
complex current i
by i*Z = v
.
The impedance Z_ref = R_ref + j*X_ref
is given as complex input signal, representing the
resistive and reactive component of the input impedance. The resistive
component is modeled temperature dependent, so the real part R_actual = real(Z)
is determined from
the 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:
imag(Z_ref) > 0
: inductive caseX_actual
is proportional to f/f_ref
imag(Z_ref) < 0
: capacitive caseX_actual
is proportional to f_ref/f
A zero crossing of the real or imaginary part of the impedance signal Z_ref
could cause
singularities due to the actual structure of the connected network.
Resistor, Conductor, Capacitor, Inductor, Impedance, Admittance, Variable resistor, Variable conductor, Variable capacitor, Variable inductor, Variable admittance
useHeatPort 
Value: false Type: Boolean Description: =true, if heatPort is enabled 

T 
Value: T_ref Type: Temperature (K) Description: Fixed device temperature if useHeatPort = false 
T_ref 
Value: 293.15 Type: Temperature (K) Description: Reference temperature 
alpha_ref 
Value: 0 Type: LinearTemperatureCoefficient (ยน/K) Description: Temperature coefficient of resistance (R_actual = R_ref*(1 + alpha_ref*(heatPort.T  T_ref)) 
frequencyDependent 
Value: false Type: Boolean Description: Consider frequency dependency, if true 
f_ref 
Value: 1 Type: Frequency (Hz) Description: Reference frequency, if frequency dependency is considered 
pin_p 
Type: PositivePin Description: Positive quasistatic singlephase pin 


pin_n 
Type: NegativePin Description: Negative quasistatic singlephase pin 

heatPort 
Type: HeatPort_a Description: Conditional heat port 

Z_ref 
Type: ComplexInput Description: Variable complex impedance 
v 
Type: ComplexVoltage Description: Complex voltage 


i 
Type: ComplexCurrent Description: Complex current 
Modelica.Electrical.QuasiStationary.MultiPhase.Basic Multiphase variable impedance 