How to Reinitialize a Continuous Integrator Block

Questions
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1

I am having trouble figuring out to reinitialize a continuous integrator block to its y_start value given a certain conditional state.

I am modeling a Heat Pump for a week that only turns on during daylight hours.
I have the On/Off states working fine, but I would like the integrator blocks to be able to be reset each morning to their intial values.
You can see here one of the integrator outputs.

Thanks.

TCondenserOutput.png
TCondenserOutput.png1376×710 7.36 KB

It’s very easy to do this in Simulink - Integrator - as the integrator block has a state reset input built into it, but I can’t figure out how do it in System Modeler. Any insights would be appreciated.

Many Thanks.

2

For the non-experts in the crowd, please clarify, “continuous integrator block”?

3

Sorry, I just mean Modelica>Blocks>Continuous>Integrator

4

This model achieves that:

model IntegratorWithReset
  extends Modelica.Blocks.Continuous.Integrator;
  Modelica.Blocks.Interfaces.BooleanInput reset;
equation
  when reset then 
   reinit (y,y_start);
end when;
end IntegratorWithReset;

/Peter

5

Here’s an add-on to Peter’s answer:
It’s easier to copy and paste the code if the annotations are included, that way the BooleanInput block is shown in the diagram view:

model IntegratorWithReset
  extends Modelica.Blocks.Continuous.Integrator;
  Modelica.Blocks.Interfaces.BooleanInput reset annotation(Placement(visible=true, transformation(origin={-120,-60}, extent={{-20,-20},{20,20}}, rotation=0), iconTransformation(origin={-120,-80}, extent={{-20,-20},{20,20}}, rotation=-360)));
equation 
  when reset then
    reinit(y, y_start);
  end when;
end IntegratorWithReset;