Event-based state-feedback control of physically interconnected systems / Christian Stöcker.

Format:

Book

Author/Creator:

Stöcker, Christian, author.

Language:

English

Subjects (All):

Cybernetics.

Physical Description:

1 online resource : illustrations

Edition:

1st ed.

Place of Publication:

Berlin : Logos Verlag Berlin, [2014]

Summary:

Long description: Event-based control is a means to restrict the feedback in control loops to event time instants that are determined by a well-defined triggering mechanism. The aim of this control strategy is to adapt the communication over the feedback link to the system behavior. In this thesis, a state-feedback approach to event-based control is extended to systems that are composed of physically interconnected subsystems. The main concern of this thesis is disturbance rejection in interconnected systems, which is supposed to be best accomplished by a continuous state feedback. This consideration leads to the idea that the event-based state-feedback system should approximate the disturbance rejection behavior of a continuous state-feedback system with adjustable precision. Various methods for the event-based control of physically interconnected systems are investigated. In particular, decentralized, distributed and centralized state feedback is studied, which differ with respect to the effort for the communication between the components of the event-based controller over the communication network. The main results concern the design and analysis of event-based state-feedback control methods for physically interconnected systems. For all approaches the disturbance behavior of a continuous state-feedback system is shown to be approximated with adjustable accuracy by the event-based state-feedback system. The novel event-based control methods are tested and evaluated in experiments on a continuous flow process implemented on a large-scale pilot plant.

Contents:

Intro

1 Introduction

1.1 Event-based control

1.1.1 Structure

1.1.2 Application fields

1.1.3 Fundamental questions

1.2 Literature on event-based control

1.2.1 Literature survey

1.2.2 Classification of this thesis

1.3 Contributions of the thesis

1.3.1 Global and local approach to event-based control

1.3.2 Theoretical contributions

1.4 Structure of this thesis

2 Preliminaries

2.1 Notation and definitions

2.1.1 General notations

2.1.2 Non-negative matrices and M-matrices

2.2 Models

2.2.1 Plant

2.2.2 Interconnected subsystems

2.2.3 Communication network

2.3 Practical stability

2.4 Demonstration example: Two interconnected thermofluid processes

3 State-feedback approach to event-based control

3.1 Basic idea

3.2 Components of the event-based controller

3.2.1 Control input generator C

3.2.2 Event generator E

3.2.3 Disturbance estimation

3.3 Main properties of the event-based state feedback

3.3.1 Deviation between the behavior of the reference system and the eventbased control loop

3.3.2 Adaption of the communication effort to the system behavior

3.3.3 Minimum inter-event time

3.4 Example: Event-based state-feedback control of the thermofluid process

4 Event-based control of interconnected systems

4.1 Structures of event-based controllers for interconnected systems

4.2 Event triggering in interconnected systems

5 Event-based state-feedback control using broadcast communication

5.1 Event-based control with broadcast communication

5.2 Distributed realization of the event-based state-feedback approach

5.2.1 Problem statement

5.2.2 Description of the components

5.2.3 Behavior of the event-based state-feedback loop

5.2.4 Disturbance estimation

5.2.5 Approximation of the reference system behavior

5.2.6 Minimum inter-event time.

5.2.7 Discussion of the control approach

5.3 Example: Event-based state-feedback control of the thermofluid process

5.4 Event-based state feedback with incomplete state measurement

5.4.1 Problem statement

5.4.2 Structure of the event-based control system

5.4.3 Performance of the event-based control system

5.4.4 Boundedness of the difference states

5.4.5 Event threshold design method

5.4.6 Application example: Interconnected two-tank system

6 Event-based state-feedback control with local information couplings

6.1 Event-based control with unicast communication

6.2 Decentralized event-based control

6.2.1 Decentralized reference system

6.2.2 Description of the components

6.2.3 Behavior of the decentralized event-based state-feedback loop

6.2.4 Approximation of the reference system behavior

6.2.5 Coupling input estimation

6.2.6 Example: Decentralized event-based control of the thermofluid process

6.3 Analysis of interconnected event-based state-feedback loops

6.3.1 Structure of the event-based control system

6.3.2 Basic idea of the stability analysis

6.3.3 Comparison systems

6.3.4 Stability of the interconnected event-based state-feedback loops

6.3.5 Stability of interconnected continuous state-feedback loops

6.3.6 Ultimate bound

6.3.7 Minimum inter-event time

6.4 Example: Event-based disturbance rejection with local information couplings

6.4.1 Specification of the control aim

6.4.2 Design and analysis of the decentralized event-based state feedback

6.4.3 Experimental results

7 Distributed control with event-based communication

7.1 Event-based control with multicast communication

7.2 A distributed state-feedback design method

7.2.1 Approximate model

7.2.2 Extended subsystem model

7.2.3 Distributed state-feedback design.

7.2.4 Stability of the overall control system

7.2.5 Design algorithm

7.3 Event-based implementation of a distributed state-feedback controller

7.3.1 Basic idea

7.3.2 Reference system

7.3.3 Information transmissions and requests

7.3.4 Networked controller

7.3.5 Discussion of the event conditions

7.3.6 Approximation of the reference system behavior

7.3.7 Minimum inter-event times

7.4 Example: Distributed event-based control of the thermofluid process

7.4.1 Design of the distributed event-based controller

7.4.2 Simulation and experimental results

8 Summary and outlook

8.1 Contributions of the thesis

8.2 Open problems

Bibliography

Appendix.

Notes:

Description based on print version record.

PublicationDate: 20140430

ISBN:

3-8325-9581-3

OCLC:

1021810879