.IndustrialControlSystems.Controllers.PI

Information

Description

Proportional + Integral controller with Automatic, Tracking mode and bias signal.
The control law is defined as

              1+sTi 
  CS(s) = Kp ------- (SP(s) - PV(S))
               sTi
  


Scheme



Name Description Conditional?
SP Set Point NO
PV Process Variable NO
CS Control Signal NO
TR Track Reference signal YES (useTS)
TS Track Switch signal YES (useTS)
Bias Biasing signal YES (useBIAS)
ATreq AutoTuning request YES (*)
(*) AutoTuning Not available here, please see the package
AutoTuning

The controller can have various operating conditions:
In the Automatic mode, the control output is computed with the proportional+integral control law, while in the tracking mode
it is defined by the input TR.

To note that in the tracking mode the output signal CS is equal to TR, and the first order filter
     1
  -------- TR(S)
   1+s*Ti
  
is replaced by
     1
  -------- TR(S)
   1+s*eps
  
where eps is a small time constant. With such a scheme, the integrator does not diverge while the tracking mode
is enabled.

Revisions

Industrial Control Systems (v 1.0.0) : April-May 2012
List of revisions:
  • 11 May 2012 (author: Marco Bonvini)
Main Authors:
Marco Bonvini; <bonvini@elet.polimi.it>
Alberto Leva <leva@elet.polimi.it>
Politecnico di Milano
Dipartimento di Elettronica e Informazione
Via Ponzio 34/5
20133 Milano - ITALIA -
Copyright:
Copyright © 2010-2012, Marco Bonvini and Alberto Leva.
The IndustrialControlSystems package is free software; it can be redistributed and/or modified under the terms of the Modelica license.

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