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 BuildingSystems.Electrical.AC.ThreePhasesUnbalanced.Lines.TwoPortMatrixRL_N that includes the capacitive effects of the lines.
The fourth line is the neutral one.
i1
, i2
and
i3
.
Setting a zero start value led Dymola 2017 on Linux to find a different solution
for
BuildingSystems.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.