AixLib.Electrical.AC.ThreePhasesUnbalanced.Lines.TwoPortMatrixRL

# .AixLib.Electrical.AC.ThreePhasesUnbalanced.Lines.TwoPortMatrixRL

Model of an RL line parameterized with impedance matrices

## 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. The voltage between the ports is

where Vi{p,n} is the voltage phasor at the connector `p` or `n` of the i-th phase, while Iip the current phasor entering from the connector `p` of the i-th phase.

The model is parameterized with an impedance matrix Z. The matrix is symmetric thus just the upper triangular part of it has to be defined.

## Revisions

- April 5, 2022, by Michael Wetter:
  Set nominal attribute for voltage at terminals. This is required for AixLib.Electrical.AC.ThreePhasesUnbalanced.Validation.IEEETests.Test4NodesFeeder.UnbalancedStepUp.DD to converge with Dymola 2023 beta3. Inspecting the homotopy trajectory showed that this variable diverged to an unreasonable value.
- 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 AixLib.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.
  Made current and voltage public to allow setting start values.
  This is for #584.
- October 6, 2014, by Marco Bonvini:
  Revised documentation and model.
- June 5, 2014, by Marco Bonvini:
  Added model.

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