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International Conferences on Info-Tech and Info-Net, ICII 2001

作者： Lu, Shu-Qiang Qin, Shi-Yin Song, Yong-Hua Ru, Shan-Mu Department of Automatic Control Beijing Polytechnic University Beijing China Department of Electrical Engineering and Electronics Brunel University Uxbridge Middlesex United Kingdom Taiyuan Steel and Iron Co. LTD. Shanxi Province China

ISBN: (纸本)0780370104

A hierarchical control structure is presented and a hybrid model including DEDS (discrete event dynamic systems) and CVCS (continuous variable controlled systems) are proposed. Moreover, frequency emergency control, voltage emergency control and coordination emergency control concerning with both frequency emergency control and voltage emergency control, are discussed and the hybrid models based on Petri nets are proposed respectively to deal with these problems. Further, a simulation of the coordination emergency control for a power system with four generators is given to verify the correctness and effectiveness of the modeling method and the control strategy proposed in this paper. © 2001 ieeE.

关键词： Differential Petri nets Emergency control Hybrid power systems

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The Emergency control of Hybrid Power System:Organization Structure＆modelling Method with Petri Nets

The Emergency Control of Hybrid Power System:Organization St...

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2001 International Conferences on Info-tech and Info-net

作者： Shu-Qiang Lu Shi-Yin Qin Yong-Hua Song Shan-Mu Ru Department of Automatic Control Beijing Polytechnic University Department of Electrical Engineering and Electronics Brunel UniversityUxbridgeMiddlesexUB8 3PHU.K. Taiyuan Steel and Iron Co. LTD.

A hierarchical control structure is presented and a hybrid model including DEDS(discrete event dynamic systems) and CVCS(continuous variable controlled systems) is proposed in this paper ***,frequency emergency control, voltage emergency control and coordination emergency control concerning with both frequency emergency control and voltage emergency control,are discussed and the hybrid models based on Petri nets are proposed respectively to deal with tiiese ***,a simulation of the coordination emergency control for a power system with four generators is given to verify the correctness and effectiveness of the modeling method and the control strategy proposed in this paper.

关键词： Hybrid power systems Emergency control Differential Petri nets

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Unobservable fault-propagation control of serial production systems based on discrete-event models

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iee PROCEEDINGS-control THEORY AND APPLICATIONS 2000年第4期147卷 381-386页

作者： Cho, KH Lim, JT Univ Ulsan Sch Elect Engn & Automat Div Elect Engn Ulsan 680749 South Korea Korea Adv Inst Sci & Technol Dept Elect Engn Taejon 305701 South Korea

The paper formulates the multiagent fault-tolerant supervisory control of serial production systems under partial observation based on unobservable fault identification utilising the difference information of the controlled results. This allows the productivity of the serial production systems to be improved and the facilities to be protected in a certain abnormal situation. A case study of the fault-propagation control of polypropylene prepolymerisation and polymerisation reactors is provided to illustrate the proposed control scheme.

关键词： production control chemical industry fault-propagation control serial production systems polymerisation reactors fault diagnosis simulation, modelling and identification systems theory applications Chemical industry systems theory applications in industry discrete event simulation polymerisation multi-agent systems Artificial intelligence discrete-event models Production management multiple agent supervisory control

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A uml-based approach to the modelling and supervisory control of manufacturing machinery

A uml-based approach to the modelling and supervisory contro...

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作者： Bordbar, B. Giacomini, L. Holding, D.J. Dept. of Electronic Engineering Aston University Aston Triangle Birmingham B4 7ET United Kingdom

A unified modeling language (UML) based approach to the modeling and supervisory control of manufacturing machinery was discussed. UML design procedure enables constructing abstract continuous and discrete event models of the components and the synchronization logic. It is suggested that UML design procedure facilitate the automatic design the co-cordination and synchronization logic. It also open the possibility of scalable designs for large scale or compositional systems.

关键词： Computer programming languages

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Migration path study of a distribution SCADA system

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iee PROCEEDINGS-GENERATION TRANSMISSION AND DISTRIBUTION 1999年第3期146卷 313-317页

作者： Su, CL Lu, CN Lin, MC Natl Sun Yat Sen Univ Dept Elect Engn Kaohsiung Taiwan Taiwan Power Co Koaping Reg Off Kaohsiung Taiwan

Owing to competitive changes in the electric power industry, it is essential to protect the large financial and human resources investment a utility makes when acquiring a SCADA/EMS. Past experience has indicated that, with proper planning, an obsolete SCADA/EMS can be incrementally augmented. The migration approach provides immediate access to new technology while capital costs are spread over a number of years. To evaluate the different migration options of an area dispatch and control system, a discrete event simulation method is used to study the performance of different migration designs. A thorough analysis of a functionally distributed architecture under realistic conditions is conducted, and the results are reported.

关键词： competitive changes simulation, modelling and identification Data acquisition systems for control discrete event simulation distribution SCADA system Power engineering computing capital costs power distribution control energy management systems load dispatching electricity supply industry migration path study area dispatch and control system Distribution networks control simulation discrete event simulation method SCADA systems control system design and analysis Data acquisition systems power system analysis computing control systems electric power industry control of electric power systems EMS control system analysis computing Public utilities Power system control

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Hybrid Flow Nets for hybrid process modelling and control

Hybrid Flow Nets for hybrid process modelling and control

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Proceedings of the 1997 iee colloquium on Hybrid control for Real-Time systems

作者： Flaus, Jean-Marie Lab d'Automatique de Grenoble St. Martin d'Heres France

The hybrid Flow Net (HFN) was used to model the continuous and discrete aspects of a system. This modeling tool is based on Petri nets and continuous flow nets, which can be seen as a continuous nonlinear extension of Petri nets. Hybrid behavior was represented by the interaction of this two kind of nets, with a cross validation of the transition of one net by places of the other and vice versa. HFN can be used for simulation and control law design.

关键词： control system synthesis

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Proceedings of the 1996 UKACC International Conference on control. Part 1 (of 2)

Proceedings of the 1996 UKACC International Conference on Co...

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Proceedings of the 1996 UKACC International Conference on control. Part 1 (of 2)

The proceedings contains 125 papers. Topics discussed include industrial applications of control systems, multi-arm robotic manipulators, real time systems, Markov models, artificial neural networks, computer simulation and modelling, system identification and parameter estimation, optimal control, robust control, fault diagnosis and condition monitoring, robotics, computer control, optimization, switching systems, genetic algorithms, manufacturing systems, process control, control design methods, nonlinear systems, fuzzy systems, aerospace applications, adaptive control, evolutionary algorithms, time discrete-event and hybrid control systems.

关键词： control systems

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Extended real-time logic for hybrid systems controller design

Extended real-time logic for hybrid systems controller desig...

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iee colloquium on Hybrid control for Real-Time systems

作者： J.G. Hall R. de Lemos High Integrity Systems Engineering Group Department of Computer Science University of York UK Centre for Software Reliability Department of Computing Science University of Newcastle UK

Summary form only given. Hybrid systems are systems which combine both continuous variable and discrete event dynamics. Their complexity has risen to the extent that traditional approaches which dealt separately with the continuous and discrete aspects of such systems have become obsolete. Instead of proposing a novel formal notation for the specification of controllers for hybrid systems we have developed extended real time Logic (ERTL) as a formal notation for the modelling and analysis of relative and absolute timing properties of hybrid systems. ERTL embeds the discrete system model of the real time logic (RTL) of Jahanian and Mok (1986, 1988) into continuous time, and adds the ability to reason about piecewise continuous functions using predicates over real valued variables. While RTL is able to formally describe the behaviour of computational entities in the time domain, ERTL also permits the formal description of the behaviour of physical entities in both value and time domains.

关键词： discrete time systems

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simulation modelling of flexible manufacturing systems

Simulation modelling of flexible manufacturing systems

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iee Manufacturing Division colloquium on Manufacturing simulation

作者： Nasir, B.M.

The elements of a flexible manufacturing system include workstations, load/unload stations, transport, pallets, fixtures, tools, buffers/store and control computers. In embarking on a simulation, the system should be defined and the model validated. A stochastic discrete next event simulation is usually used. simulation provides system behavior prior to its construction or provides non-invasive study of an existing system and produces awareness of the problem as well as acting as a communication aid. A simulation can be developed graphically or in a general purpose language or by a simulation package which is a set of common routines or by a generic model or by a data driven method. The trend in simulation development is towards easiness in use and understanding of the output.

关键词： Computer simulation

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simulation modelling of flexible manufacturing systems

Simulation modelling of flexible manufacturing systems

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iee colloquium on Manufacturing simulation

作者： B.M. Nasir London UK

The elements of a flexible manufacturing system include workstations, load/unload stations, transport, pallets, fixtures, tools, buffer/store and control computer. In embarking on a simulation the system should be defined and the model validated. A stochastic discrete next event simulation is usually used. simulation provides system behaviour prior to its construction or provides non-invasive study of an existing system and produces awareness of the problem as well as a communication aid. The author discusses the development of manufacturing simulation and performance maximisation.

关键词： discrete event simulation Flexible manufacturing systems Computer integrated manufacturing

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