modelACACTransformer

AC AC transformer simplified equivalent circuit

Extends from Buildings.Electrical.Icons.RefAngleConversion (Icon that represents if the angle symble should be displayed or not), Buildings.Electrical.Interfaces.PartialConversion (Model representing a generic two port system for conversion).

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 the inductance.

Parameters

Type	Name	Default	Description
Modelica.Units.SI.Voltage	VHigh		Rms voltage on side 1 of the transformer (primary side)
Modelica.Units.SI.Voltage	VLow		Rms voltage on side 2 of the transformer (secondary side)
Modelica.Units.SI.ApparentPower	VABase		Nominal power of the transformer
Real	XoverR		Ratio between the complex and real components of the impedance (XL/R)
Real	Zperc		Short circuit impedance
Ground › side 1
Boolean	ground_1	false	If true, connect side 1 of converter to ground
Ground › side 2
Boolean	ground_2	true	If true, connect side 2 of converter to ground
Initialization
Modelica.Units.SI.Angle	phi_1	0	Angle of the voltage side 1 at initialization
Modelica.Units.SI.Angle	phi_2	phi_1	Angle of the voltage side 2 at initialization

Connectors

Type	Name	Default	Description
Buildings.Electrical.Interfaces.BaseTerminal	terminal_n (from PartialBaseTwoPort)		Electric terminal side p
Buildings.Electrical.Interfaces.BaseTerminal	terminal_p (from PartialBaseTwoPort)		Electric terminal side n

Components

Type	Name	Description
Modelica.Units.SI.Voltage	v_p (from PartialConversion)	Voltage drop between the two positive pins
Modelica.Units.SI.Voltage	v_n (from PartialConversion)	Voltage drop between the two negative pins
Modelica.Units.SI.Current	i_p (from PartialConversion)	Current flowing through the positive pins
Modelica.Units.SI.Current	i_n (from PartialConversion)	Current flowing through the negative pins
Modelica.Units.SI.Efficiency	eta	Efficiency
Modelica.Units.SI.Power[2]	PLoss	Loss power
Modelica.Units.SI.Voltage[2]	V1	Voltage at the winding - primary side
Modelica.Units.SI.Voltage[2]	V2	Voltage at the winding - secondary side

Revisions

January 30, 2019, by Michael Wetter:
Added missing replaceable for the terminal.
November 28, 2016, by Michael Wetter:
Made voltage public to allow setting a start value in Buildings.Electrical.AC.ThreePhasesUnbalanced.Validation.IEEETests.Test4NodesFeeder.UnbalancedStepUp.DY.
This is for #584.
September 4, 2014, by Michael Wetter:
Revised model.
August 5, 2014, by Marco Bonvini:
Revised documentation.
June 17, 2014, by Marco Bonvini:
Adde parameter phi_1 and phi_2 that are used during initialization to specify the angle of the voltage phasor.
June 9, 2014, by Marco Bonvini:
Revised implementation and added stateSelect statement to use the current i[:] on the connectors as iteration variable for the initialization problem.
January 29, 2012, by Thierry S. Nouidui:
First implementation.