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Applikationen & Tools Answers for indust ry. Deckblatt Model Predictive Control including integral transfer functions SIMATIC PCS 7 Application Example April 2010.
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MPC Level V 1.0, Beitrags-ID: 42200753 3 Copyright Siemens AG 2010 All rights reserved Industry Automation and Driv es Tech nologies Service & Support Portal This article is taken from the Service Portal of Siemens AG, Industry Automation and Drives Technologies.
Warranty and Liability 4 MPC Level V 1.0, Beitrags-ID: 42200753 Copyright Siemens AG 2010 All rights reserved Warranty and Liability Note The Application Examples are not bindin g and do not claim to be complete regarding the circuits shown, equipping and any eventuality.
Table of Contents MPC Level V 1.0, Beitrags-ID: 42200753 5 Copyright Siemens AG 2010 All rights reserved T able of Content s Warranty a nd Liability ................................................................................................. 4 1 Preface .
Preface 6 MPC Level V 1.0, Beitrags-ID: 42200753 Copyright Siemens AG 2010 All rights reserved 1 Preface Objective of the Application The area of application of the model pred ictive controller pr.
Introduction MPC Level V 1.0, Beitrags-ID: 42200753 7 Copyright Siemens AG 2010 All rights reserved 2 Introduction 2.1 Basic Principles of Model Predictive Control A general overview of model pred.
Introduction 8 MPC Level V 1.0, Beitrags-ID: 42200753 Copyright Siemens AG 2010 All rights reserved Figure 2-1 Step response of a control loo p with compensation (blue) and witho ut compensation (red), i.e. with integral behaviour. 0 10 20 30 40 50 60 70 80 90 100 0 0.
Introduction MPC Level V 1.0, Beitrags-ID: 42200753 9 Copyright Siemens AG 2010 All rights reserved 2.3 Examples of Unstable Control Loops 2.3.1 Level Control If the level of a tank with continuous feed is to be controlled via an a djustable drain as actuator (e.
Introduction 10 MPC Level V 1.0, Beitrags-ID: 42200753 Copyright Siemens AG 2010 All rights reserved feed water tanks. There are different objec tives for level control according to the plant context [also see Related Literature /2.
Introduction MPC Level V 1.0, Beitrags-ID: 42200753 11 Copyright Siemens AG 2010 All rights reserved 2.3.3 Position Control The control loop shows integrating b ehaviour if the position of mechanical parts is controlled and the speed of the actuator is available as manipulated variable.
Stabilization of Unst able Control Loops 12 MPC Level V 1.0, Beitrags-ID: 42200753 Copyright Siemens AG 2010 All rights reserved 3 S t abilization of Unst able Control Loop s Regarding the stabilization of unstable c ontrol loops, integral processes and mono- tone unstable or oscillating unstable processes have to be distin guished.
Stabilization of Unst able Control Loops MPC Level V 1.0, Beitrags-ID: 42200753 13 Copyright Siemens AG 2010 All rights reserved The behaviour of an integrating process 1 1 s.
Stabilization of Unst able Control Loops 14 MPC Level V 1.0, Beitrags-ID: 42200753 Copyright Siemens AG 2010 All rights reserved 3.2 PID Tuner The PCS 7 PID tuner can be used for integral processes with out problems if at least one stable controller parameterization is already available.
Configuration of MPC with Slave Controller MPC Level V 1.0, Beitrags-ID: 42200753 15 Copyright Siemens AG 2010 All rights reserved 4 Configuration of MPC with Slave Controller 4.1 Starting Point The starting point is the standard connection of the MPC with its a ctuators.
Configuration of MPC with Slave Controller 16 MPC Level V 1.0, Beitrags-ID: 42200753 Copyright Siemens AG 2010 All rights reserved Figure 4-2 Signal flow chart of MPC with s ubordinated stabilizing PID controller for the integral main transfer function g22 The slave controller stabili zes the control variable CV1 in gene ral.
Configuration of MPC with Slave Controller MPC Level V 1.0, Beitrags-ID: 42200753 17 Copyright Siemens AG 2010 All rights reserved Figure 4-3 Connection of MPC and slave co ntroller.
Configuration of MPC with Slave Controller 18 MPC Level V 1.0, Beitrags-ID: 42200753 Copyright Siemens AG 2010 All rights reserved 4.3 Commissioning The parameterization of the controller a nd the commissionin g is done „from interior to exterior” as in any cascade control.
Simulation Example MPC Level V 1.0, Beitrags-ID: 42200753 19 Copyright Siemens AG 2010 All rights reserved 5 Simulation Example The simulation example was generated from a co py of the plant section ModPre- Con of the APL_Example_EU, by introduci ng an a dditional integral block after the transfer function Proc662.
Simulation Example 20 MPC Level V 1.0, Beitrags-ID: 42200753 Copyright Siemens AG 2010 All rights reserved Figure 5-2 OS picture of the example proj ect Despite the interaction bet ween both m ani.
Conclus ion MPC Level V 1.0, Beitrags-ID: 42200753 21 Copyright Siemens AG 2010 All rights reserved 6 Conclusion The area of application of the model pred ictive controller embedd ed in SIMATIC PCS 7 is extended clearly by the descri bed stabilization of unstabl e sub control loops with the help of a slave propo rtional- only controller.
Related Literature 22 MPC Level V 1.0, Beitrags-ID: 42200753 Copyright Siemens AG 2010 All rights reserved 7 Related Literature 7.1 Bibliography This list is not complete and only rep resents a selection of relevant literature. Tabelle 7-1 Titel /1/ Krämer, S.
History MPC Level V 1.0, Beitrags-ID: 42200753 23 Copyright Siemens AG 2010 All rights reserved 8 History Tabelle 8-1 Version Date Modifications V1.
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