.Buildings.Electrical.AC.ThreePhasesUnbalanced.Lines.TwoPortMatrixRLC_N

Information

RLC line model (π-model) that connects two AC three-phase unbalanced interfaces and neutral line. This model can be used to represent a cable in a three-phase unbalanced AC system.

The model is parameterized with an impedance matrix Z and an admittance matrix B. The impedance matrix is symmetric, and therefore only the upper triangular part of the matrix needs to be defined.

This model is a more detailed version of the model Buildings.Electrical.AC.ThreePhasesUnbalanced.Lines.TwoPortMatrixRL_N that includes the capacitive effects of the lines.

Note

The fourth line is the neutral one.

Revisions

• April 5, 2023, by Michael Wetter:
  Set nominal attribute for voltage at terminal.
• November 28, 2016, by Michael Wetter:
  Made current and voltage public to allow setting start values.
  This is for #584.
• November 28, 2016, by Michael Wetter:
  Removed zero start value for currents i1, i2 and i3. Setting a zero start value led Dymola 2017 on Linux to find a different solution for Buildings.Electrical.AC.ThreePhasesUnbalanced.Validation.IEEETests.Test4NodesFeeder.BalancedStepDown.YD. Also, the current is typically non-zero and zero is anyway the default start value, hence there is no need to set it.
  This is for #584.
• January 14, 2015, by Marco Bonvini:
  Created model and documentation.