Package with three-phase and hybrid positive-sequence/three-phase models
This package contains three-phase models that can be used to create systems where unbalance plays an important role. Distribution and sub-transmission systems are candidates.
Three-phase systems can be easily connected to equivalent positive-sequence systems by using hybrid positive-sequence/three-phase devices. These models are called MonoTri and are usually represented as a pi-equivalent model. Transformers and power lines have their MonoTri representation in this package.
In addition, multi-phase bus, bank and load models are also available here. The modelling of such devices is based, mainly, on the following works:
Extends from Modelica.Icons.Package (Icon for standard packages).
Name | Description |
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Banks | Multi-phase capacitor bank models |
Branches | Multi-phase and hybrid positive-sequence/three-phase lines and transformers |
Buses | Multi-phase buses |
Loads | Multi-phase load models |
ThreePhaseComponent | Partial model for inheritance of single-phase base power based on three-phase system base power. |
Partial model for inheritance of single-phase base power based on three-phase system base power.
If the three-phase model deals with power, it is necessary to extand this partial model. It basically takes the system base power, which is a three-phase value, and calculates the per-phase base power. This is necessary for obtaining the correct per-unit values of current and voltages in a three-phase power system connected to a positive-sequence-equivalent system.
For instance, if the system base is 100 MVA, in a positive-sequence-equivalent grid, the phase base is 33.33 MVA.
Name | Description |
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Power flow data | |
S_b | System base [V.A] |
S_p | Phase base [V.A] |