modelACACTransformerDD

AC AC transformer simplified equivalent circuit (DD)

Extends from BuildingSystems.Electrical.AC.ThreePhasesUnbalanced.Conversion.BaseClasses.PartialConverterDD.

Information

This is a simplified equivalent transformer model with Delta-Delta connection. The model accounts for winding Joule losses and leakage reactances that are represented by a series of a resistance R and an inductance L. The resistance and the inductance represent the effects of the secondary and primary side of the transformer.

The model is parameterized using the following parameters

  • Vhigh - RMS voltage at primary side,
  • Vlow - RMS voltage at secondary side,
  • VAbase - apparent nominal power of the transformer,
  • XoverR - ratio between reactance and resistance, and
  • Zperc - the short circuit impedance.

Given the nominal conditions, the model computes the values of the resistance and inductance.

Configuration:

The image below describes the connection of the windings.

image

Note:

This model reuses models from BuildingSystems.Electrical.AC.OnePhase.Conversion.ACACTransformer.

See BuildingSystems.Electrical.AC.ThreePhasesUnbalanced.Conversion.BaseClasses.PartialConverterDD for details on the connections.

Parameters

TypeNameDefaultDescription
Modelica.Units.SI.VoltageVHighRms voltage on side 1 of the transformer (primary side)
Modelica.Units.SI.VoltageVLowRms voltage on side 2 of the transformer (secondary side)
Modelica.Units.SI.ApparentPowerVABaseNominal power of the transformer
RealXoverRRatio between the complex and real components of the impedance (XL/R)
RealZpercShort circuit impedance
Ground › side 1
Booleanground_1falseConnect side 1 of transformer to ground
Ground › side 2
Booleanground_2trueConnect side 2 of transformer to ground

Revisions

  • October 3, 2014, by Marco Bonvini:
    Revised documentation.
  • June 6, 2014, by Marco Bonvini:
    First implementation.