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Initialization of Polyphase.Basic.{Capacitor, Inductor} #4488

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Oct 24, 2024
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Initialization of Polyphase.Basic.{Capacitor, Inductor} #4488

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37c1a8e
introduced initialization menu in Polyphase.Basic.{Capacitor, Inductor}
AHaumer Oct 22, 2024
d684e1c
usage of annotation(Dialog(showStartAttribute=true))
AHaumer Oct 23, 2024
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2 changes: 2 additions & 0 deletions Modelica/Electrical/Polyphase/Basic/Capacitor.mo
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,8 @@ model Capacitor "Ideal linear electrical capacitors"
extends Interfaces.TwoPlug;
parameter SI.Capacitance C[m](start=fill(1, m))
"Capacitance";
SI.Voltage vC[m](start=zeros(m), fixed=fill(false,m))=v "Capacitor voltages"
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annotation(Dialog(showStartAttribute=true));
Modelica.Electrical.Analog.Basic.Capacitor capacitor[m](final C=C)
annotation (Placement(transformation(extent={{-10,-10},{10,10}})));
equation
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2 changes: 2 additions & 0 deletions Modelica/Electrical/Polyphase/Basic/Inductor.mo
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Expand Up @@ -2,6 +2,8 @@ within Modelica.Electrical.Polyphase.Basic;
model Inductor "Ideal linear electrical inductors"
extends Interfaces.TwoPlug;
parameter SI.Inductance L[m](start=fill(1, m)) "Inductance";
SI.Current iL[m](start=zeros(m), fixed=fill(false,m))=i "Inductor currents"
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annotation(Dialog(showStartAttribute=true));
Modelica.Electrical.Analog.Basic.Inductor inductor[m](final L=L)
annotation (Placement(transformation(extent={{-10,-10},{10,10}})));
equation
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36 changes: 27 additions & 9 deletions Modelica/Electrical/Polyphase/Examples/TransformerYY.mo
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Expand Up @@ -40,7 +40,8 @@ model TransformerYY "Test example with polyphase components"
transformation(extent={{-30,-100},{-10,-80}})));
Basic.Resistor transformerR(m=m, R=fill(RT, m)) annotation (Placement(
transformation(extent={{0,10},{20,30}})));
Basic.Inductor transformerL(m=m, L=fill(LT, m)) annotation (Placement(
Basic.Inductor transformerL(m=m, L=fill(LT, m),
iL(start=zeros(m), fixed=cat(1,fill(true,m-1),{false}))) annotation (Placement(
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transformation(extent={{30,10},{50,30}})));
Basic.Resistor loadR(m=m, R=fill(RL, m)) annotation (Placement(
transformation(extent={{70,10},{90,30}})));
Expand All @@ -50,9 +51,6 @@ model TransformerYY "Test example with polyphase components"
rotation=270)));
Modelica.Electrical.Analog.Basic.Ground groundT1 annotation (Placement(
transformation(extent={{-50,-100},{-30,-80}})));
initial equation
transformerL.i[1:m - 1] = zeros(m - 1) "Y-connection";

equation
connect(starS.pin_n, groundS.p)
annotation (Line(points={{-90,-72},{-90,-80}}, color={0,0,255}));
Expand All @@ -77,12 +75,32 @@ equation
connect(loadR.plug_n, starL.plug_p)
annotation (Line(points={{90,20},{90,-52}}, color={0,0,255}));
annotation (Documentation(info="<html>
<p>Test example with polyphase components:</p>
<p>Star-connected voltage source feeds via a Y-Y-transformer with internal impedance (RT, LT) a load resistor RT.</p>
<p>Using f=5 Hz LT=3mH defines nominal voltage drop of approximately 10 &percnt;.</p>
<p>Simulate for 1 second (2 periods) and compare voltages and currents of source, transformer and load. </p>
<h4>Note</h4>
<p>
Test example with polyphase components:<br>
Star-connected voltage source feeds via a Y-Y-transformer with internal impedance (RT, LT) a load resistor RT.<br>
Using f=5 Hz LT=3mH defines nominal voltage drop of approximately 10 %.<br>
Simulate for 1 second (2 periods) and compare voltages and currents of source, transformer and load.
From the <code>m</code> currents <code>m-1</code> have to be initialized with fixed = true, one of the <code>m</code> currents with fixed = false,
due to the fact that the star connection enforces sum of the currents = 0.
</p>
<p>
Tools are expected to present a proper initialization section of the menu of <code>transformerL</code> which allows
to set the start values of the <code>m</code> currents and the fixed attributes individually, i.e. as an array.
Especially, a checkbox for the fixed attributes should be avoided.
</p>
<p>
If this is not the case, you have to write the code manually:
</p>
<p><code>
Modelica.Electrical.PolyPhase.Basic.Inductor transformerL(m=m, L=fill(LT, m),
<strong>iL(start=zeros(m), fixed=cat(1,fill(true,m-1),{false}))</strong>);</code>
</p>
</html>"),
experiment(StopTime=1.0, Interval=0.001));
experiment(StopTime=1.0, Interval=0.001),
Diagram(graphics={Text(
extent={{0,60},{80,40}},
textColor={28,108,200},
textString="Regarding initialization:
see Documentation")}));
end TransformerYY;