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Issue3022 cdl continuos derivative (#3023)
* Implementation of CDL.Continuous.Derivative For #3022
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|---|---|---|
| @@ -0,0 +1,121 @@ | ||
| within Buildings.Controls.OBC.CDL.Continuous; | ||
| block Derivative | ||
| "Block that approximates the derivative of the input" | ||
| parameter Real y_start=0 | ||
| "Initial value of output (= state)" | ||
| annotation (Dialog(group="Initialization")); | ||
|
|
||
| Buildings.Controls.OBC.CDL.Interfaces.RealInput k | ||
| "Connector for gain signal" | ||
| annotation (Placement(transformation(extent={{-140,60},{-100,100}}))); | ||
| Buildings.Controls.OBC.CDL.Interfaces.RealInput T( | ||
| final quantity="Time", | ||
| final unit="s", | ||
| min=100*Buildings.Controls.OBC.CDL.Constants.eps) | ||
| "Time constant (T>0 required; T=0 is ideal derivative block)" | ||
| annotation (Placement(transformation(extent={{-140,20},{-100,60}}))); | ||
| Buildings.Controls.OBC.CDL.Interfaces.RealInput u | ||
| "Input to be differentiated" | ||
| annotation (Placement(transformation(extent={{-140,-20},{-100,20}}))); | ||
| Buildings.Controls.OBC.CDL.Interfaces.RealOutput y | ||
| "Approximation of derivative du/dt" | ||
| annotation (Placement(transformation(extent={{100,-20},{140,20}}))); | ||
| protected | ||
| Real T_nonZero(final unit="s") "Non-zero value for T"; | ||
|
|
||
| output Real x | ||
| "State of block"; | ||
|
|
||
| initial equation | ||
| x= if abs(k) < Buildings.Controls.OBC.CDL.Constants.eps then u else u - T*y_start/k; | ||
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| equation | ||
| T_nonZero = max(T, 100*Buildings.Controls.OBC.CDL.Constants.eps); | ||
| der(x) = (u-x)/T_nonZero; | ||
| y = (k/T_nonZero)*(u-x); | ||
|
|
||
| annotation ( | ||
| defaultComponentName="der", | ||
| Documentation( | ||
| info="<html> | ||
| <p> | ||
| This blocks defines the transfer function between the | ||
| input <code>u</code> and the output <code>y</code> | ||
| as <i>approximated derivative</i>: | ||
| </p> | ||
| <pre> | ||
| s | ||
| y = k * ------------ * u | ||
| T * s + 1 | ||
| </pre> | ||
| <p> | ||
| If <code>k=0</code>, the block reduces to <code>y=0</code>. | ||
| </p> | ||
| </html>", | ||
| revisions="<html> | ||
| <ul> | ||
| <li> | ||
| May 20, 2022, by Michael Wetter:<br/> | ||
| First implementation.<br/> | ||
| This is for | ||
| <a href=\"https://github.com/lbl-srg/modelica-buildings/issues/3022\">issue 3022</a>. | ||
| </li> | ||
| </ul> | ||
| </html>"), | ||
| Icon( | ||
| coordinateSystem( | ||
| extent={{-100.0,-100.0},{100.0,100.0}}), | ||
| graphics={ | ||
| Rectangle( | ||
| extent={{-100,-100},{100,100}}, | ||
| lineColor={0,0,127}, | ||
| fillColor={255,255,255}, | ||
| fillPattern=FillPattern.Solid), | ||
| Line( | ||
| points={{-56,78},{-56,-90}}, | ||
| color={192,192,192}), | ||
| Polygon( | ||
| lineColor={192,192,192}, | ||
| fillColor={192,192,192}, | ||
| fillPattern=FillPattern.Solid, | ||
| points={{-56,90},{-64,68},{-48,68},{-56,90}}), | ||
| Line( | ||
| points={{-64,-80},{82,-80}}, | ||
| color={192,192,192}), | ||
| Polygon( | ||
| lineColor={192,192,192}, | ||
| fillColor={192,192,192}, | ||
| fillPattern=FillPattern.Solid, | ||
| points={{90.0,-80.0},{68.0,-72.0},{68.0,-88.0},{90.0,-80.0}}), | ||
| Line( | ||
| origin={-24.667,-27.333}, | ||
| points={{-31.333,89.333},{-19.333,-40.667},{86.667,-52.667}}, | ||
| color={0,0,127}, | ||
| smooth=Smooth.Bezier), | ||
| Text( | ||
| extent={{-150,150},{150,110}}, | ||
| textString="%name", | ||
| textColor={0,0,255}), | ||
| Text( | ||
| extent={{226,60},{106,10}}, | ||
| textColor={0,0,0}, | ||
| textString=DynamicSelect("",String(y, | ||
| leftJustified=false, | ||
| significantDigits=3))), | ||
| Text( | ||
| extent={{-106,14},{-62,-12}}, | ||
| textColor={0,0,0}, | ||
| textString="u"), | ||
| Text( | ||
| extent={{46,14},{90,-12}}, | ||
| textColor={0,0,0}, | ||
| textString="y=du/dt"), | ||
| Text( | ||
| extent={{-108,94},{-64,68}}, | ||
| textColor={0,0,0}, | ||
| textString="k"), | ||
| Text( | ||
| extent={{-108,54},{-64,28}}, | ||
| textColor={0,0,0}, | ||
| textString="T")})); | ||
| end Derivative; |
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