Description
In this example have been tested the functionalities of the digital PI with Automatic Tuning.
The PI has to control the process with transfer function
Y(s) 1
---- = --------------
U(s) (s + 1)^3
There are three PIs that are automatically tuned. The PIs have different Phase Margin requirements: 45, 60 and 70 respectively.
The first image shows the process variables controlled by the three PIs PV.
There are thre phases:
- Normal mode [0,50]: PIs working with default parameters values,
- Auto Tuning phase [50,120]: PIs excite the processes in order to identify some characteristic parameters,
- Normal mode [120,end]: PIs working with tuned parameters values
Control signals
References
For more information please refers to the following
paper:
Efficient hybrid simulation of autotuning PI controllers
Alberto Leva, Marco Bonvini
8th Modelica Conference, Dresden, Germany
march 20-22, 2011
- 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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.IndustrialControlSystems.Controllers.AutoTuning.Examples.Test_ATPIrelayNCdigital