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Initialization of Polyphase.Basic.{Capacitor, Inductor} (#4488)
* introduced initialization menu in Polyphase.Basic.{Capacitor, Inductor} * usage of annotation(Dialog(showStartAttribute=true))
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Diff for: ‎Modelica/Electrical/Polyphase/Basic/Capacitor.mo

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Original file line numberDiff line numberDiff line change
@@ -3,6 +3,8 @@ model Capacitor "Ideal linear electrical capacitors"
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extends Interfaces.TwoPlug;
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parameter SI.Capacitance C[m](start=fill(1, m))
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"Capacitance";
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SI.Voltage vC[m](start=zeros(m), fixed=fill(false,m))=v "Capacitor voltages"
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annotation(Dialog(showStartAttribute=true));
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Modelica.Electrical.Analog.Basic.Capacitor capacitor[m](final C=C)
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annotation (Placement(transformation(extent={{-10,-10},{10,10}})));
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equation

Diff for: ‎Modelica/Electrical/Polyphase/Basic/Inductor.mo

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@@ -2,6 +2,8 @@ within Modelica.Electrical.Polyphase.Basic;
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model Inductor "Ideal linear electrical inductors"
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extends Interfaces.TwoPlug;
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parameter SI.Inductance L[m](start=fill(1, m)) "Inductance";
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SI.Current iL[m](start=zeros(m), fixed=fill(false,m))=i "Inductor currents"
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annotation(Dialog(showStartAttribute=true));
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Modelica.Electrical.Analog.Basic.Inductor inductor[m](final L=L)
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annotation (Placement(transformation(extent={{-10,-10},{10,10}})));
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equation

Diff for: ‎Modelica/Electrical/Polyphase/Examples/TransformerYY.mo

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@@ -40,7 +40,8 @@ model TransformerYY "Test example with polyphase components"
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transformation(extent={{-30,-100},{-10,-80}})));
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Basic.Resistor transformerR(m=m, R=fill(RT, m)) annotation (Placement(
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transformation(extent={{0,10},{20,30}})));
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Basic.Inductor transformerL(m=m, L=fill(LT, m)) annotation (Placement(
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Basic.Inductor transformerL(m=m, L=fill(LT, m),
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iL(start=zeros(m), fixed=cat(1,fill(true,m-1),{false}))) annotation (Placement(
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transformation(extent={{30,10},{50,30}})));
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Basic.Resistor loadR(m=m, R=fill(RL, m)) annotation (Placement(
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transformation(extent={{70,10},{90,30}})));
@@ -50,9 +51,6 @@ model TransformerYY "Test example with polyphase components"
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rotation=270)));
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Modelica.Electrical.Analog.Basic.Ground groundT1 annotation (Placement(
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transformation(extent={{-50,-100},{-30,-80}})));
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initial equation
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transformerL.i[1:m - 1] = zeros(m - 1) "Y-connection";
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equation
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connect(starS.pin_n, groundS.p)
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annotation (Line(points={{-90,-72},{-90,-80}}, color={0,0,255}));
@@ -77,12 +75,32 @@ equation
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connect(loadR.plug_n, starL.plug_p)
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annotation (Line(points={{90,20},{90,-52}}, color={0,0,255}));
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annotation (Documentation(info="<html>
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<p>Test example with polyphase components:</p>
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<p>Star-connected voltage source feeds via a Y-Y-transformer with internal impedance (RT, LT) a load resistor RT.</p>
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<p>Using f=5 Hz LT=3mH defines nominal voltage drop of approximately 10 &percnt;.</p>
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<p>Simulate for 1 second (2 periods) and compare voltages and currents of source, transformer and load. </p>
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<h4>Note</h4>
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<p>
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Test example with polyphase components:<br>
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Star-connected voltage source feeds via a Y-Y-transformer with internal impedance (RT, LT) a load resistor RT.<br>
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Using f=5 Hz LT=3mH defines nominal voltage drop of approximately 10 %.<br>
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Simulate for 1 second (2 periods) and compare voltages and currents of source, transformer and load.
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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,
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due to the fact that the star connection enforces sum of the currents = 0.
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</p>
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<p>
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Tools are expected to present a proper initialization section of the menu of <code>transformerL</code> which allows
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to set the start values of the <code>m</code> currents and the fixed attributes individually, i.e. as an array.
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Especially, a checkbox for the fixed attributes should be avoided.
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</p>
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<p>
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If this is not the case, you have to write the code manually:
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</p>
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<p><code>
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Modelica.Electrical.PolyPhase.Basic.Inductor transformerL(m=m, L=fill(LT, m),
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<strong>iL(start=zeros(m), fixed=cat(1,fill(true,m-1),{false}))</strong>);</code>
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</p>
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</html>"),
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experiment(StopTime=1.0, Interval=0.001));
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experiment(StopTime=1.0, Interval=0.001),
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Diagram(graphics={Text(
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extent={{0,60},{80,40}},
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textColor={28,108,200},
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textString="Regarding initialization:
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see Documentation")}));
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end TransformerYY;

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