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Attempt to fix #4559 by increasing RonDiode and GoffDiode #4562

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Merged
merged 2 commits into from
Mar 5, 2025
Merged

Attempt to fix #4559 by increasing RonDiode and GoffDiode #4562

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1c97ed9
Increased Ron and Goff to make the system more numerically robust
casella Mar 4, 2025
a55de87
Updated documentation
casella Mar 4, 2025
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6 changes: 3 additions & 3 deletions Modelica/Magnetic/FundamentalWave/Examples/BasicMachines/SynchronousMachines/SMPM_Braking.mo
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Expand Up @@ -69,7 +69,7 @@ model SMPM_Braking
origin={-10,0},
extent={{-10,-10},{10,10}},
rotation=270)));
Modelica.Electrical.PowerConverters.ACDC.DiodeBridge2mPulse diodeBridge2mPulse(m=m)
Modelica.Electrical.PowerConverters.ACDC.DiodeBridge2mPulse diodeBridge2mPulse(m = m, RonDiode = 1e-4, GoffDiode = 1e-4)
annotation (Placement(transformation(
extent={{-10,10},{10,-10}},
rotation=90,
Expand Down Expand Up @@ -149,13 +149,13 @@ equation
connect(starM.pin_n, grounding.p)
annotation (Line(points={{-70,-10},{-70,5},{-70,20}}, color={0,0,255}));
annotation (experiment(StopTime=0.8, Interval=1E-4, Tolerance=1e-06), Documentation(
info="<html>
info= "<html>
<p>
A synchronous machine with permanent magnets starts braking from nominal speed by feeding a diode bridge,
which in turn feeds a braking resistor.
Since induced voltage is reduced proportional to falling speed, the braking resistance is set proportional
to speed to achieve constant current and torque.</p>

<p>Default machine parameters are used</p>
<p>Default machine parameters are used. The RonDiode and GoffDiode parameters of the diode bridge are both increased to 1e-4 to avoid numerical issues when the variable resistor voltage gets close to zero.</p>
</html>"));
end SMPM_Braking;