VariableImpedanceMultiphase 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
in each phase.
The linear impedance connects the complex voltage v
with the
complex current i
by i*Z = v
in each phase,
using m
variable singlephase impedances.
The impedances Z_ref = R_ref + j*X_ref
are given as complex input signals, representing the
resistive and reactive components of the input impedances. The resistive
components are modeled temperature dependent, so the real part R_actual = real(Z)
are determined from
the 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:
imag(Z_ref) > 0
: inductive caseX_actual
are proportional to f/f_ref
imag(Z_ref) < 0
: capacitive caseX_actual
are proportional to f_ref/f
Zero crossings of the real or imaginary parts of the impedance signals Z_ref
could cause
singularities due to the actual structure of the connected network.
VariableResistor, Resistor, Conductor, Capacitor, Inductor, Impedance, Admittance, Variable conductor, Variable capacitor, Variable inductor Variable admittance
mh 
Value: m Type: Integer Description: Number of heatPorts=number of phases 

useHeatPort 
Value: false Type: Boolean Description: =true, if all heat ports are enabled 
T 
Value: T_ref Type: Temperature[mh] (K) Description: Fixed device temperatures if useHeatPort = false 
T_ref 
Value: fill(293.15, m) Type: Temperature[m] (K) Description: Reference temperatures 
alpha_ref 
Value: zeros(m) Type: LinearTemperatureCoefficient[m] (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 
plug_p 
Type: PositivePlug Description: Positive quasistatic polyphase plug 


plug_n 
Type: NegativePlug Description: Negative quasistatic polyphase plug 

heatPort 
Type: HeatPort_a[mh] Description: Conditional heat ports 

Z_ref 
Type: ComplexInput[m] Description: Variable complex impedances 
v 
Type: ComplexVoltage[m] Description: Complex voltage 


i 
Type: ComplexCurrent[m] Description: Complex current 

plugToPins_p 
Type: PlugToPins_p 

plugToPins_n 
Type: PlugToPins_n 

variableImpedance 
Type: VariableImpedance[m] 