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IEEE International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS)

作者： Heyoung Lee Z. Bien Department of Control and Instrumentation Engineering Seoul National University Seoul South Korea Department of Electrical Engineering and Computer Science KAIST Taejon South Korea

The sub-Nyquist nonuniform sampling (SNNS) scheme and the corresponding perfect reconstruction formula are addressed. Also, a condition to enable the perfect reconstruction of the continuous-time signal from its nonuniform samples is derived. The average sampling rate of the proposed SNNS method is less than or equal to the sampling rate of the Nyquist uniform sampling method.

关键词： Nonuniform sampling Sampling methods Image reconstruction Magnetic resonance imaging Signal sampling Sensor arrays Data compression Time measurement Time frequency analysis Instruments

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Weichted Least Squares Parameter Estimation for Model Predictive control of Integrated Wastewater Systems at Medium Time Scale

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IFAC Proceedings Volumes 2004年第11期37卷 273-279页

作者： Konarczak K Rutkowsld T Brdys M.A Gmiński T Department of Automatic Control Gdansk University of Technology ul.G. Nanttowicza 11 ¡2 80-952 Gdansk Poland School of Engineering Department of Electronic Electrical and Computer Engineering The University of Birmingham Birmingham B15 2TT UK

The paper presents formulation and implementation of Weighted Least Squares algorithm with moving measurement window for a grey box model parameters estimation purposes. The grey box of a biological reactor dynamics is used by Model Predictive controller to control integrated wastewater treatment system at medium time scale. The parameter estimation Weighted Least Squares algorithm is validated by simulation based on recently developed and calibrated model of integrated wastewater treatment system in Kartuzy, Poland.

关键词： Models waste treatment parameter estimation Least Squares Kaiman filtering biotechnology water pollution

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Supervisory control of Integrated Wastewater Treatment Systems

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IFAC Proceedings Volumes 2004年第11期37卷 257-264页

作者： M Grochowski M.A Brdys K Duzinkiewicz R Langowski Department of Automatic Control Gdansk University of Technology ul G. Narutowicza 11 12 80 9 52 Gdansk Poland School of Engineering Department of Electrical Electronic and Computer Engineering The university of Birmingham Birmingham B15 2TT UK

control of integrated wastewater treatment plant-sewer systems under full range of disturbance inputs enforces employing advanced optimising control algorithms. The control activities are hierarchically structured into a multilevel-multilayer form Model Predictive control is chosen as a core control technology. As it is impossible to handle sufficiently well all operating conditions of this system, the operating states of the system are distinguished and these are: normal, disturbed and emergency. Formulation of operational states requires introducing the concepts of the core and secondary objectives that divide the system objectives into obligatory and additionally ones. Different control trajectories are designed for corresponding operational states in order to best adopt control actions to current plant conditions. In order to effectively control such complex system the Supervisory Level (SuCL) is introduced. Its main functionality is: to coordinate activities of the control structure, to asses operational states of the system, to asses selection of the control strategies, to asses imposed control setpoints realisation and risk of not fulfilling the objectives. Paper describes units adjacent to SuCL that major function is to provide the information needed by the SuCL and decision making process.

关键词： Supervisory control decision making neural networks hierarchical control optimal control risk waste treatment

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Measurement of pressures in silos using strain gages

Measurement of pressures in silos using strain gages

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2004 IFAC Workshop on Programmable Devices and Systems, PDS 2004

作者： Martinák, Lukáš Oujezdský, Aleš Slíva, Aleš Department of Measurement and Control Faculty of Electrical Engineering and Computer Science 17. listopadu 15 Ostrava-Poruba708 33 Czech Republic Institute of Transportation Faculty of Mechanical Engineering VŠB-Technical University of Ostrava 17. listopadu 15 Ostrava-Poruba708 33 Czech Republic

The paper deals with a bulk solid pressure observation inside a silo using new developed 3Dimensional (Triaxial) Indicator. New design and conception of the 3D indicator have been developed exclusively for detecting of real stresses/pressures inside vessels, bunkers and silos. The unique design of the 3D indicator in cooperation with appropriate used software, and with a silo model is able to assure a clear image to pressure/stress identifications in particulate solid. Moreover, the third dimension is unique and enriches the area of the pressure knowledge. The measurement process incl. the procedure of processing values using the created interactive software environment has been explained in the poster intimately and investigated in a real silo loaded by a poured bulk solid. Real results and outputs of the investigation have been presented and discovered in the paper. © 2004 IFAC.

关键词： Strain gages

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Set-Bounded Joined Parameter and State Estimation for Model Predictive control of Integrated Wastewater Treatment Plant Systems at Medium Time Scale

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IFAC Proceedings Volumes 2004年第11期37卷 755-760页

作者： T. Rutkowski M.A. Brdys K. Konarczak T. Gminski Department of Automatic Control Gdansk University of Technology ul. G. Narutowicza 11/12 80 952 Gdansk Poland School of Engineering Department of Electronic Electrical and Computer Engineering The University of Birmingham Birmingham B15 2TT UK

The paper describes set-bounded parameters and state estimation component for Model Predictive control of integrated wastewater treatment plant at medium time scale purposes. This is one of the components within Intelligent Hierarchical control Structure designed in order to cope with problems of the controlled system such us: multiple time scale, highly non linear dynamics, small number of on-line measurements etc. The set-bounded joined parameter and state estimation algorithm generates robust estimates of these parameters and state for Model Predictive control purposes. Both, the estimation algorithm and the Model Predictive controller utilise a grey-box model of controlled plant dedicated for medium time scale. The set-bounded joined state and grey-box model parameters estimation algorithm is validated by simulation. The data were taken partly from real data records gathered at Kartuzy WWTP in Poland and partly from the Kartuzy plant simulation based on recently developed and calibrated plant model.

关键词： biotechnology hierarchical control systems model predictive control robust control estimation algorithms bounding method uncertainty

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On stabilization of linear systems with stochastic disturbances and input saturation

On stabilization of linear systems with stochastic disturban...

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IEEE Conference on Decision and control

作者： A. Stoorvogel S. Weiland A. Saberi Department of Mathematics and Computing Science Eindhovan University of Technology Eindhoven Netherlands Department of Electrical Engineering Mathematics and Computer Science Delft University of Technnology Delft Netherlands Control Systems Group Department of Electrical Engineering Eindhovan University of Technology Eindhoven Netherlands School of Electrical Engineering and Computer Science Washington State University Pullman WA USA

It is well-known that for linear systems internal asymptotic stability implies external stability in the sense that when the external input is in L/sub p/ then also the state will be in L/sub p/. However, for the control of linear systems with saturation where the controlled system is nonlinear this implication is no longer directly applicable. Several people have studied the effect of external inputs in L/sub p/ either directly or in the context of ISS as introduced by Sontag. In this paper we study the effect of external stochastic disturbances on linear systems with input saturation and we establish that when we can achieve internal global asymptotic stability then we can also achieve a bounded variance for the state.

关键词： Linear systems Stochastic systems Asymptotic stability control systems Feedback Nonlinear control systems Open loop systems Discrete time systems Mathematics computer science

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LMI based output feedback control of discrete linear repetitive processes

LMI based output feedback control of discrete linear repetit...

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American control Conference (ACC)

作者： B. Sulikowski K. Galkowski E. Rogers D.H. Owens Institute of Control and Computation Engineering University of Zielona Gora Zielona Gora Poland School of Electronics and Computer Science University of Southampton Southampton UK Department Automatic Control and Systems Engineering University of Sheffield Sheffield UK

Repetitive processes are a distinct class of 2D systems (i.e. information propagation in two independent directions) of both systems theoretic and applications interest. They cannot be controlled by direct extension of existing techniques from either standard (termed 1D here) or 2D systems theory. Here we give new results on the relatively open problem of the design of physically based control laws. These results are for the sub-class of so-called discrete linear repetitive processes, which arise in applications areas such as iterative learning control.

关键词： Output feedback Linear feedback control systems Iterative algorithms Optimal control automatic control automatic generation control Stability analysis Vectors Linear systems control systems

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A20: Using a PLC Tecomat TC600 as a fuzzy regulator in the problem of an inverted pendulum system regulation

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IFAC Proceedings Volumes 2004年第20期37卷 115-120页

作者： Petr Želasko Martin Moštěk Miroslav Pokorný Faculty of Electrical Engineering and Computer Science VSB Technical University of Ostrava Department of Measurement and Control 17. listopadu 15 708 33 Ostrava - Poruba CZECH REPUBLIC

This work solves a problem of the inverted pendulum system regulation using a fuzzy regulator. As this regulator has been used the programmable logic controller (PLC) Tecomat TC600, type 607. The PLC is connected to the personal computer (PC) by the use of a voltage converter and an industrial PC card PCI 1751. The PC works as a simulation device of the inverted pendulum system, where the simulation is performed by a program created in the Delphi programming language version 5. The fuzzy model used in the fuzzy regulator is designed directly for the inverted pendulum system. The whole application has been successfully tested and also very good results have been reached.

关键词： Fuzzy control Programmable logic controller Regulation Inverted pendulum System model Simulation Tests

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Softly Switched Model Predictive control for control of Integrated Wastewater Treatment Systems at Medium Time Scale

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IFAC Proceedings Volumes 2004年第11期37卷 251-256页

作者： M Grochowski M.A Brdys T Gminski P Deinrych Department of Automatic Control Gdansk University of Technology ul G. Narutowicza 11 12. 80 9 52 Gdansk Poland School of Engineering Department of Electrical Electronic and Computer Engineering The University of Birmingham Birmingham B15 2TT UK

Difficulties occur when one universal control strategy attempts controlling a plant that is under wide range of operating conditions. In order to best adopt the control strategy to existing conditions three operational states: normal, disturbed and emergency are distinguished and the corresponding control strategies are designed. Appearance of different control strategies at hand enforces finding a mechanism to switch between them. It can be done in a hard or a soft manner. In case of wastewater systems the second solution is preferable. The paper describes two methods of soft switching between control strategies based on Model Predictive control (MPC) as a control technology Supervisory control Level (SuCL) mounted at the top of hierarchical multilevel-multilayer control structure is responsible for the conducting the switching process. The switching instants, switching time and way of switching are parameters to be selected by the SuCL. The soft switching concepts were examined based on wastewater system in Kartuzy, Poland.

关键词： switching predictive control waste treatment optimal control supervisory control

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A calculation for the compensation voltages in dynamic voltage restorers by use of PQR power theory

A calculation for the compensation voltages in dynamic volta...

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Annual IEEE Conference on Applied Power Electronics Conference and Exposition (APEC)

作者： Hyosung Kim Sang-Joon Lee Seung-Ki Sul Department of Control Engineering Cheonan National Technical College South Korea School of Electrical Engineering and Computer Science Seoul National University South Korea

This paper discusses how to calculate the compensation voltages in dynamic voltage restorers (DVR) by use of PQR power theory. Directly sensed three-phase voltages are transformed to p-q-r coordinates without time delay, then the reference voltages in p-q-r coordinates have very simple form: dc values. The controller in p-q-r coordinates is very simple and clear, has better steady state and dynamic performance than conventional controllers. The controlled variables in p-q-r coordinates are then inversely transformed to the original a-b-c coordinates instantaneously, generating reference compensation voltages to a DVR. The control algorithm can be used for various kinds of series compensators such as dynamic voltage restorers (DVR), series active filters (SAP), synchronous static series compensators (SSSC), and bootstrap variable inductances (BVI). The control algorithm was applied to an experimental DVR system. The experimental results verified the performance of the proposed control algorithm.

关键词： Voltage control control systems Steady-state Circuit faults Delay effects Power system restoration Power quality control engineering Educational institutions computer science

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