modelTwoPortRL

Model of a resistive-inductive element with two electrical ports

Extends from Modelica.Electrical.Analog.Interfaces.ConditionalHeatPort, BuildingSystems.Electrical.AC.ThreePhasesUnbalanced.Interfaces.TwoPort.

Information

Resistive-inductive model that connects two AC three-phase unbalanced interfaces. This model can be used to represent a cable in a three-phase unbalanced AC system.

image

The model represents the lumped impedances as shown in the figure above. Assuming that the overall cable has a resistance R and an inductance L, each line has an inductance equal to L/3 and a resistance equal to R/3.

Parameters

TypeNameDefaultDescription
Modelica.Units.SI.ResistanceRResistance at temperature T_ref
Modelica.Units.SI.TemperatureT_ref298.15Reference temperature
Modelica.Units.SI.TemperatureM507.65Temperature constant (R_actual = R*(M + T_heatPort)/(M + T_ref))
Modelica.Units.SI.InductanceLInductance
Modelica.Units.SI.Current[2]i1_start{0, 0}Initial current phasor of phase 1 (positive if entering from terminal p)
Modelica.Units.SI.Current[2]i2_start{0, 0}Initial current phasor of phase 2 (positive if entering from terminal p)
Modelica.Units.SI.Current[2]i3_start{0, 0}Initial current phasor of phase 3 (positive if entering from terminal p)
Modeling assumption
BuildingSystems.Electrical.Types.LoadmodeBuildingSystems.Electrical.Types.Load.FixedZ_steady_stateType of model (e.g., steady state, dynamic, prescribed power consumption, etc.)

Components

TypeNameDefaultDescription
OnePhase.Lines.TwoPortRLphase1Impedance line 1
OnePhase.Lines.TwoPortRLphase2Impedance line 2
OnePhase.Lines.TwoPortRLphase3Impedance line 3

Revisions

  • March 9, 2015, by Marco Bonvini:
    Added parameter for start value of the current.
  • January 14, 2015, by Marco Bonvini:
    Added equation that represents Joule losses
  • October 6, 2014, by Marco Bonvini:
    Revised documentation and model.