digital control system analysis and design phillips pdf

Digital Control System Analysis And Design Phillips Free Public Full

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The detailed mathemati cs associ- ated with the NCS study can be found from the references listed and from the general control literature. 2 General framework and main sur vey 2.1 Introduction The area of NCSs is still in its infancy and there are at least two subjects where existing results can be improved.

A simple framework and some general formulations for the study of NCSs are proposed.

In addition to the survey on NCSs, the impact of NCSs on traditional large-scale system control methodologies with a related application is also reviewed.

Sampling time skew between controller and ith sensor NCS with two-level communications Experimental study of NCS with a WAN Different controller structures and signal transfer requirements a Decentralised control scheme b Quasi-decentralised control scheme c Centralised control scheme Quasi-decentralised power system control with synchronised measurement Figures - uploaded by Taicheng Yang Author content All figure content in this area was uploaded by Taicheng Yang Content may be subject to copyright.

Digital Control System Analysis And Design Phillips Free Public Full

Discover the worlds research 20 million members 135 million publications 700k research projects Join for free Public Full-text 1 Content uploaded by Taicheng Yang Author content All content in this area was uploaded by Taicheng Yang on Jul 12, 2014 Content may be subject to copyright.

A simple framework and some general formul ations for the study of NCSs are proposed.

In addition to the survey on NCSs, the impact of NCSs on traditional large- scale system control methodologies with a relat ed application is also reviewed.

Introduction A major trend in mode rn industrial and comme rcial systems is to integrate computing, com munica tion and control into dif ferent levels of machine factor y operations and infor- mation processes.

Control loops that are closed over a com munication network have become more and more common as the hard- ware devices for networ ks and network nodes have become cheaper.

NCS setup and its inf ormation ows 2.

The traditi onal com munication architecture for control systems, whi ch has been successfully imp lemented in industry for decades, is point-to-point; that is, a wire con- nects the central control com puter with each sensor or actuator point.

However, expanding physi cal setups and functionality are pushing the limits of the point-to- point architecture.

Hence, a traditional centralised point-to-point control system is no longer suitabl e to meet new require- ments, such as modularity, decentralisation of control, inte- grated diagnost ics, quick and easy maint enance and low cost.

The introduction of common-bus network architec- tures can improve the ef ciency, e xibility and reliability of these integrated applications through reduc ed wiring and distributed intelligenc e and so reduce the installation, reconguration and maintenance time and costs.

The change of communication architecture from point- to-point to common bus, however, introduces different forms of time-delay uncertainty between sensors, actuators and controllers.

The characteristics of time delays can be constant, b ounded or random, depending on the network prot ocols adopted and the chosen hardware.

It is well know n in control systems that time delays can degrade a systems performance and even cause system instability.

There is also a possi bility that sensor cont rol signals may be lost in communication.

This paper can be considered as an up-to-date supplement, repor ting the most recen t developments in this area, to a survey by Tipsuwan and Chow 3 with only three of their 41 references (from the IEEE Control Systems Magazine ) quoted in this paper.

With almost ever y control confe rence now having sess ions on networks and cont rol, this survey has been limited to main journal publications.

Within this limit, it is aimed at providing a comprehensive, representative and up-to-date sample of the research in this area.

Some future research is proposed at relevant places in the paper.

The main objective of the paper is to provide readers with an overview of the area, in the context of a cle ar con- ceptual framework, and a vision for future development.

Consequently, the mathematical notations and equations used in this paper are simple and the total number of them is kept to minimum.

The detailed mathemati cs associ- ated with the NCS study can be found from the references listed and from the general control literature.

General framework and main sur vey 2.1 Introduction The area of NCSs is still in its infancy and there are at least two subjects where existing results can be improved.

Digital Control System Analysis And Design Phillips Pdf