Predictive Control for Wireless Networked Systems in Process Industry

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MARC

Henriksson, Erik,1982-KTH,Reglerteknik,ACCESS Linnaeus Centre (author)

Predictive Control for Wireless Networked Systems in Process Industry

BookEnglish2014

Publisher, publication year, extent ...

Stockholm :KTH Royal Institute of Technology,2014
viii,123 s.
electronicrdacarrier

Numbers

LIBRIS-ID:oai:DiVA.org:kth-141459
ISBN:9789175950143
https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-141459URI

Supplementary language notes

Language:English
Summary in:English

Part of subdatabase

SwePubSwePub

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Subject category:vet swepub-contenttype
Subject category:dok swepub-publicationtype

Series

TRITA-EE,1653-5146 ;2014:004

Notes

QC 20140217
Wireless networks in industrial process control enable new system architectures and designs. However, wireless control systems can be severely affected by the imperfections of the communication links. This thesis proposes new methods to handle such imperfections by adding additional components in the control loop, or by adapting sampling intervals and control actions.First, the predictive outage compensator is proposed. It is a filter which is implemented at the receiver side of networked control systems. There it generates predicted samples when data are lost, based on past data. The implementation complexity of the predictive outage compensator is analyzed. Simulation and experimental results show that it can considerably improve the closed-loop control performance under communication losses.The thesis continues with presenting an algorithm for controlling multiple processes on a shared communication network, using adaptive sampling intervals. The methodology is based on model predictive control, where the controller jointly decides the optimal control signal to be applied as well as the optimal time to wait before taking the next sample. The approach guarantees conflict-free network transmissions for all controlled processes. Simulation results show that the presented control law reduces the required amount of communication, while maintaining control performance.The third contribution of the thesis is an event-triggered model predictive controller for use over a wireless link. The controller uses open-loop optimal control, re-computed and communicated only when the system behavior deviates enough from a prediction. Simulations underline the methods ability to significantly reduce computation and communication effort, while guaranteeing a desired level of system performance.The thesis is concluded by an experimental validation of wireless control for a physical lab process. A hybrid model predictive controller is used, connected to the physical system through a wireless medium. The results reflect the advantages and challenges in wireless control.

Subject headings and genre

TEKNIK OCH TEKNOLOGIER Elektroteknik och elektronik Reglerteknik hsv//swe
ENGINEERING AND TECHNOLOGY Electrical Engineering, Electronic Engineering, Information Engineering Control Engineering hsv//eng
model predictive control; networked control systems; wireless systems; process industry; automatic control

Added entries (persons, corporate bodies, meetings, titles ...)

Johansson, Karl H.,ProfessorKTH,Reglerteknik,ACCESS Linnaeus Centre(Swepub:kth)u1h0d9k2 (thesis advisor)
Sandberg, Henrik,DocentKTH,Reglerteknik,ACCESS Linnaeus Centre(Swepub:kth)u1i9irki (thesis advisor)
Hägglund, Tore,ProfessorLunds Tekniska Högskola, Lunds Universitet (opponent)
KTHReglerteknik (creator_code:org_t)

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