Buildings.Electrical.AC.ThreePhasesUnbalanced.Conversion

Package with converter and transformer models for three-phase unbalanced AC systems

Information

This package contains models that represent different types of three phases unbalanced AC/AC transformers and AC/DC converters.

Extends from Modelica.Icons.Package (Icon for standard packages).

Package Content

Name	Description
ACACConverter	AC AC converter single phase systems (YY)
ACACTransformer	AC AC transformer simplified equivalent circuit (YY)
ACACTransformerDD	AC AC transformer simplified equivalent circuit (DD)
ACACTransformerFull	AC AC transformer detailed equivalent circuit (YY)
ACACTransformerStepDownDY	AC AC transformer simplified equivalent circuit (DY step down)
ACACTransformerStepDownYD	AC AC transformer simplified equivalent circuit (YD step down)
ACACTransformerStepUpDY	AC AC transformer simplified equivalent circuit (DY step up)
ACACTransformerStepUpYD	AC AC transformer simplified equivalent circuit (YD step up)
Examples	Package with example models
BaseClasses	Package with base class models

Buildings.Electrical.AC.ThreePhasesUnbalanced.Conversion.ACACConverter

AC AC converter single phase systems (YY)

Information

This is an AC AC converter, based on a power balance between both circuit sides. The paramater conversionFactor defines the ratio between the RMS voltages

V₂ = conversionFactor * V₁

where V₁ and V₂ are the RMS voltages at the primary and secondary sides of the transformer (connector N and P respectively).

The loss of the converter is proportional to the power transmitted. The parameter eta is the efficiency of the transfer. The loss is computed as

P_loss = (1-η) P_tr

where P_tr is the power transmitted. The model is bi-directional and the power can flow from both the primary to the secondary and vice-versa. Furthermore, reactive power on both side are set to 0.

Configuration:

The image below describes the connection of the windings.

Note:

This model reuses models from Buildings.Electrical.AC.OnePhase.Conversion.ACACConverter.

See Buildings.Electrical.AC.ThreePhasesUnbalanced.Conversion.BaseClasses.PartialConverterYY for details on the connections.

Extends from Buildings.Electrical.AC.ThreePhasesUnbalanced.Conversion.BaseClasses.PartialConverterYY (Model of a transformer with Y connection primary side and Y connection secondary side).

Parameters

Connectors

Modelica definition

Buildings.Electrical.AC.ThreePhasesUnbalanced.Conversion.ACACTransformer

AC AC transformer simplified equivalent circuit (YY)

Information

This is a simplified equivalent transformer model. 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 both 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.

Note:

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

See Buildings.Electrical.AC.ThreePhasesUnbalanced.Conversion.BaseClasses.PartialConverterYY for details on the connections.

Extends from Buildings.Electrical.AC.ThreePhasesUnbalanced.Conversion.BaseClasses.PartialConverterYY (Model of a transformer with Y connection primary side and Y connection secondary side).

Parameters

Connectors

Modelica definition

Buildings.Electrical.AC.ThreePhasesUnbalanced.Conversion.ACACTransformerDD

AC AC transformer simplified equivalent circuit (DD)

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.

Note:

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

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

Extends from Buildings.Electrical.AC.ThreePhasesUnbalanced.Conversion.BaseClasses.PartialConverterDD (Model of a transformer with D connection primary side and D connection secondary side).

Parameters

Connectors

Modelica definition

Buildings.Electrical.AC.ThreePhasesUnbalanced.Conversion.ACACTransformerFull

AC AC transformer detailed equivalent circuit (YY)

Information

This is a detailed transformer model that takes into accounts the winding Joule losses, and the leakage reactances on the primary and secondary side. The model also takes into account the core or iron losses and the losses due to magnetization effects.

The losses are represented by a series of resistances R₁, R₂, R_m and inductances L₁, L₂, and L_m.

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,
• f - frequency,
• R_1, L_1 - resistance and inductance at primary side (per unit),
• R_2, L_2 - resistance and inductance at secondary side (per unit), and
• R_m, L_m - resistance and inductance for magnetization effects (per unit).

Given the nominal conditions, the model computes the values of the nominal impedances at the primary and secondary side. Given these values, the per unit values are transformed into the actual values of the resistances and inductancs.

The magnetization losses can be enabled or disabled using the boolean flag magEffects.

Configuration:

The image below describes the connection of the windings.

Note:

This model reuses models from Buildings.Electrical.AC.OnePhase.Conversion.ACACTransformerFull.

See Buildings.Electrical.AC.ThreePhasesUnbalanced.Conversion.BaseClasses.PartialConverterYY for details on the connections.

Extends from Buildings.Electrical.AC.ThreePhasesUnbalanced.Conversion.BaseClasses.PartialConverterYY (Model of a transformer with Y connection primary side and Y connection secondary side).

Parameters

Connectors

Modelica definition

Buildings.Electrical.AC.ThreePhasesUnbalanced.Conversion.ACACTransformerStepDownDY

AC AC transformer simplified equivalent circuit (DY step down)

Information

This is a simplified equivalent transformer model with Y-Delta connection (voltage step down). 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.

Note:

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

See Buildings.Electrical.AC.ThreePhasesUnbalanced.Conversion.BaseClasses.PartialConverterStepDownDY for details on the connections.

Extends from Buildings.Electrical.AC.ThreePhasesUnbalanced.Conversion.BaseClasses.PartialConverterStepDownDY (Model of a transformer with D connection primary side and Y connection secondary side (Voltage step down)).

Parameters

Connectors

Modelica definition

Buildings.Electrical.AC.ThreePhasesUnbalanced.Conversion.ACACTransformerStepDownYD

AC AC transformer simplified equivalent circuit (YD step down)

Information

This is a simplified equivalent transformer model with Y-Delta connection (voltage step down). 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.

Note:

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

See Buildings.Electrical.AC.ThreePhasesUnbalanced.Conversion.BaseClasses.PartialConverterStepDownYD for details on the connections.

Extends from Buildings.Electrical.AC.ThreePhasesUnbalanced.Conversion.BaseClasses.PartialConverterStepDownYD (Model of a transformer with Y connection primary side and D connection secondary side (Voltage step down)).

Parameters

Connectors

Modelica definition

Buildings.Electrical.AC.ThreePhasesUnbalanced.Conversion.ACACTransformerStepUpDY

AC AC transformer simplified equivalent circuit (DY step up)

Information

This is a simplified equivalent transformer model with Delta-Y connection (voltage step up). 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.

Note:

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

See Buildings.Electrical.AC.ThreePhasesUnbalanced.Conversion.BaseClasses.PartialConverterStepUpDY for details on the connections.

Extends from Buildings.Electrical.AC.ThreePhasesUnbalanced.Conversion.BaseClasses.PartialConverterStepUpDY (Model of a transformer with D connection primary side and Y connection secondary side (Voltage step up)).

Parameters

Connectors

Modelica definition

Buildings.Electrical.AC.ThreePhasesUnbalanced.Conversion.ACACTransformerStepUpYD

AC AC transformer simplified equivalent circuit (YD step up)

Information

This is a simplified equivalent transformer model with Y-Delta connection (voltage step up). 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.

Note:

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

See Buildings.Electrical.AC.ThreePhasesUnbalanced.Conversion.BaseClasses.PartialConverterStepUpYD for details on the connections.

Extends from Buildings.Electrical.AC.ThreePhasesUnbalanced.Conversion.BaseClasses.PartialConverterStepUpYD (Model of a transformer with Y connection primary side and D connection secondary side (Voltage step up)).

Parameters

Connectors

Modelica definition