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Application of a steam temperature optimized control system in thermal power plants

Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power 2005年第4期20卷 430-432页

作者： Lin, Yan-Ping Zhou, Bao-Lin Computer Science and Engineering Department Shanghai Jiaotong University Shanghai 200030 China Emerson Process Control Co. Ltd. Shanghai 201206 China

As a result of more and more aggressive competition, power plants are taking steps to strength their ability by applying advanced control strategy and technology. Therefore, the study of advanced process control (APC) composed of model control technology and intelligent control strategy such as Fuzzy Logic, Neural Network got popularly attention. Here we introduce an application of advanced steam temperature control strategy on fuel power station. There are two kinds of control were designed based on Fuzzy Logic and Neural Network. After testing, it indicated that the efficiency of the power plant could be distinctly improved by the application of these advanced control technology.

关键词： Advanced steam control APC Fuzzy logic Neural network

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Robust H∞output feedback control for a class of uncertain Lur'e systems with time-delays

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2004年第9期 108-117页

作者：曹丰文鲁仁全苏宏业褚健 Zhejiang University Hangzhou 310027 Institute oj Advanced Process Control Suzhou 215011 Suzhou Vocational University Department of Computer and Electron China

In this work, the analysis of robust stability and design of robust H∞ output feedback controllers for a class of Lur’e systems with both time-delays and parameter uncertainties were studied. A robust H∞ output feedback controller based on Linear Matrix Inequalities (LMIs) was developed to guarantee the robust stability and H∞ performance of the resultant closed-loop system. The presented design approach is based on the application of descriptor model transformation and Park’s inequality for the bounding of cross terms and is expected to be less conservative compared to reported design methods. Finally, illustrative examples are advanced to demonstrate the superiority of the obtained method.

关键词： Lur’e systems Robust H∞ control Linear Matrix Inequality (LMI)

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Quadratic stability of process systems in generalized Lotka-Volterra form 6

Quadratic stability of process systems in generalized Lotka-...

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6th IFAC Symposium on Nonlinear control Systems, NOLCOS 2004

作者： Magyar, A. Szederkényi, G. Hangos, K.M. Process Control Research Group Systems and Control Laboratory Computer and Automation Research Institute HAS P.O. Box 63 BudapestH-1518 Hungary Department of Computer Science University of Veszprém Egyetem u. 10 VeszpremH-8200 Hungary

The global and local stability of process systems in generalized Lotka-Volterra form is studied in this paper using entropy-like and quadratic Lyapunov function candidates. The global stability check for LV models is performed by solving an LMI for a diagonal positive semi-definite matrix using singular perturbation technique. It is shown that a quadratic Lyapunov function can also be determined by solving linear matrix inequalities (LMIs). In addition, the quadratic stability neighborhood is convex in the space of the quasi-monomials and can be estimated by computing its comer points using LMIs. Furthermore, it is proved that quadratic stability with a diagonal weighting matrix enables to construct adissipative-Hamiltonian description of the system. The developed methods are illustrated on the model of a continuously stirred tank reactor with a nonlinear reaction system. Copyright © 2004 IFAC.

关键词： Linear matrix inequalities

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Computing a FWL stability measure for second order digital systems

Computing a FWL stability measure for second order digital s...

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International Conference on control, Automation, Robotics and Vision (ICARCV)

作者： J. Wu S. Chen J. Chu National Key Laboratory of Industrial Control Technology Institute of Advanced Process Control University of Zhejiang Hangzhou China Department of Electronics and Computer Science University of Southampton Highfield Southampton UK National Key Laboratory of Industrial Control Technology Institute of Advanced Process Control Zhejiang University Hangzhou China

The best measure quantifying FWL (finite word length) stability is the one that bases on the largest stable perturbation hypercube. But the computing of this FWL stability measure has not been solved. For second order digital systems, this paper develops an analytic computing method. Through solving 12 linear equations and 12 quadratic equations, the measure value can be obtained exactly.

关键词： Stability Digital systems control systems Industrial control Laboratories process control Equations Digital filters Digital control Eigenvalues and eigenfunctions

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A new approach to admissible alternatives in interval decision making

A new approach to admissible alternatives in interval decisi...

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International IEEE Conference on Intelligent Systems, IS

作者： V. Boeva B. De Baets Department of Computer Systems Technical University Sofia Plovdiv Plovdiv Bulgaria Department of Applied Mathematics Biometrics and Process Control Ghent University IMEC Ghent Belgium

In the framework of interval decision making, the available information is vague and numerically imprecise and the decision situation is modelled by imprecise probabilities and utilities that are simply represented by suitable intervals and comparisons. Alternatives are therefore evaluated in terms of interval expected utilities, which are then used for expressing crisp preferences among these alternatives. In this work, we use the overlap of the above interval expected utilities for expressing valued preferences among the alternatives. In particular, a chain of interval order relations associated with the constructed valued preference relation is studied and the concept of admissibility is expressed in terms of non-dominated alternatives induced by such relations.

关键词： Decision making Utility theory Information analysis Pressing Linear systems Probability distribution Lakes Numerical models

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On the min-transitive approximation of symmetric fuzzy relations

On the min-transitive approximation of symmetric fuzzy relat...

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IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： P. Dawyndt H. De Meyer B. De Baets Laboratory of Microbiology Ghent University Ghent Belgium Department of Applied Mathematics and Computer Science Ghent University Ghent Belgium Department of Applied Mathematics Biometrics and Process Control Ghent University Ghent Belgium

Two new algorithms are proposed for generating a min-transitive approximation of a given reflexive and symmetric fuzzy relation which, in general, deviates less from the given fuzzy relation than its min-transitive closure, and which is guaranteed to be still reflexive and symmetric. Since the new algorithms are weight-driven, they can be used to generate layer by layer the partition tree associated to the corresponding min-transitive approximation. We report on numerical tests that have been carried out on synthetic data to compare the approximations generated by the new algorithms to the min-transitive closure and the min-transitive approximation delivered by the UPGMA clustering algorithm.

关键词： Approximation algorithms Fuzzy sets Partitioning algorithms Clustering algorithms Mathematics Fuzzy control computer science Biometrics process control Laboratories

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Quadratic stability of process systems in generalized lotka-volterra form

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IFAC Proceedings Volumes 2004年第13期37卷 1217-1222页

作者： A. Magyar G. Szederkényi K.M. Hangos Process Control Research Group Systems and Control Laboratory Computer and Automation Research Institute HAS H-1518 P.O. Box 63 Budapest Hungary Tel.: +361 2796000； fax: +361 466 7503 Department of Computer Science University of Veszprém H-8200 Egyetem u. 10 Veszprém Hungary Tel.: +***； fax: +***

The global and local stability of process systems in generalized Lotka-Volterra form is studied in this paper using entropy-like and quadratic Lyapunov function candidates. The global stability check for LV models is performed by solving an LMI for a diagonal positive semi-definite matrix using singular perturbation technique. It is shown that a quadratic Lyapunov function can also be determined by solving linear matrix inequalities (LMIs). In addition, the quadratic stability neighborhood is convex in the space of the quasi-monomials and can be estimated by computing its corner points using LMIs. Furthermore, it is proved that quadratic stability with a diagonal weighting matrix enables to construct a dissipative-Hamiltonian description of the system. The developed methods are illustrated on the model of a continuously stirred tank reactor with a nonlinear reaction system.

关键词： quasi-polynomial systems Lotka-Volterra systems stability analysis linear matrix inequalities Hamiltonian systems

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Stability of linear time invariant systems with interval fractional orders and interval coefficients

Stability of linear time invariant systems with interval fra...

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ICCC 2004 - Second IEEE International Conference on Computational Cybernetics

作者： Petráš, Ivo Chen, Yangquan Vinagre, Bias M. Podlubny, Igor Department of Informatics and Process Control BERG Faculty Technical University of Kosice B. Nemcovej 3 042 00 Kosice Slovakia Dept. of Electrical and Computer Engineering Utah State University Logan UT 84322-4160 United States Dept. of Electronic and Electromechanical Engineering Industrial Engineering School University of Extramadura Avda. De Elvas s/n 06071-Badajoz Spain

ISBN: (纸本)0780385888

This paper considers the stability of the fractional-order linear time-invariant systems with interval type uncertainties in both fractional orders and the relevant coefficients. It is an extension of our previous result on the robust stability analysis of the interval type uncertain fractional order LTI systems with crisply known fractional orders. We have proposed a stability check procedure for uncertain LTI systems with interval fractional orders and interval coefficients. The procedure is demonstrated with some simple examples. © 2004 IEEE.

关键词： System stability

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Stability of linear time invariant systems with interval fractional orders and interval coefficients

Stability of linear time invariant systems with interval fra...

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International Conference on Computational Cybernetics (ICCC)

作者： I. Petras YangQuan Chen B.M. Vinagre I. Podlubny Department of Informatics and Process Control BERG Faculty Technical University of Kosice Kosice Slovakia Center for Self-Organizing and Intelligent System (CSOIS) Department of Electrical and Computer Engineering Utah State University UT USA Department of Electronic and Electromechanical Engineering Industrial Engineering School University of Extremadura Badajoz Spain

关键词： Time invariant systems Robust stability Stability analysis System testing Differential equations Polynomials Informatics Proportional control Uncertainty Robustness

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Recent improvements of an auditory model based front-end for the transcription of vocal queries

Recent improvements of an auditory model based front-end for...

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International Conference on Acoustics, Speech, and Signal processing (ICASSP)

作者： T. De Mulder J.P. Martens M. Lesaffre M. Leman B. De Baets H. De Meyer Department of Electronics and Information Systems (ELIS) Ghent University Ghent Belgium Institute for Psychoacoustics and Electronic Music (IPEM) Ghent University Ghent Belgium Department of Applied Mathematics Biometrics and Process Control Ghent University Ghent Belgium Department of Applied Mathematics and Computer Science Ghent University Ghent Belgium

In this paper recent improvements of an existing acoustic frontend for the transcription of vocal (hummed, sung) musical queries is presented. Thanks to the addition of a new second pitch extractor and the introduction of a novel multi-stage segmentation algorithm, the application domain of the front-end could be extended to whistled queries, and on top of that, the performance on the other two query types could be improved. Experiments have shown that the new system can transcribe vocal queries with an accuracy ranging from 76 % (whistling) to 85 % (humming), and that it clearly outperforms other state-of-the art systems on all three query types.

关键词： Frequency Music information retrieval Mathematics Pattern matching Pattern analysis Performance analysis Low pass filters Psychoacoustic models Information systems Electronic music

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