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Robust H ∞ control for uncertain discrete-time state-delayed linear systems with markovian jumping parameters 1

IFAC Proceedings Volumes 2001年第23期34卷 89-94页

作者： Reinaldo M. Palhares Carlos E. de Souza Pedro L.D. Peres Graduate Program in Electrical EngineeringPontifical Catholic University ofMinas Gerais Av. D. José Gaspar 500 30535-610 Belo Horizonte MG Brazil Department of Systems and Control Laboratório Nacional de Computação Científica - LNCCAv. Getúlio Vargas 333 25651-070 Petrópolis RJ Brazil School of Electrical and Computer Engineering University of Campinas CP 6101 13081-970 Campinas Sp Brazil

This paper addresses the problem of robust H ∞ state-feedback control design for uncertain discrete-time linear systems with multiple time delays at the states and Markovian jumping parameters. The jumping parameters are assumed to be available and the uncertainties are supposed to belong to convex bounded domains (polytope type uncertainty). Delay-independent sufficient conditions assuring robust stochastic stability and a prescribed H ∞ disturbance attenuation for the closed-loop uncertain discrete-time linear system with multiple time delays and Markovian jumping parameters are established in terms of linear matrix inequalities, which have the advantage that can be implemented numerically veryefficiently.

关键词： Robust H ∞ control time delay systems Markovian jumping parameters linear matrix inequalities discrete-time systems

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Fuzzy set theory based emergency control for power distribution systems

Fuzzy set theory based emergency control for power distribut...

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IEEE Power engineering Society Winter Meeting, 2000

作者： Cavati, C.R. Ferreira, E.P. Ekel, P.Ya. Federal University of Espirito Santo Department of Electrical Engineering Av. Fernando Ferrari S/N VitóriaES29060-970 Brazil Pontificia Catholic University of Minas Gerais Post Graduate Program in Electrical Engineering Av. Dom Jose Gaspar 500 Belo HorizonteMG30535-610 Brazil

ISBN: (纸本)0780359356

This work presents results of research related to an emergency control for distribution systems. The problem is formulated within the framework of a fuzzy transportation network problem. An effective fuzzy integer programming model is proposed with solution based on satisfaction of operational levels. The proposed methodology has been applied to a realistic power distribution system based on a primary distribution network. The results demonstrate that the approach provides not only the convincing satisfaction of the actual requirements of the power distribution system, but also offers more information to the decision maker to improve decision making quality. © 2000 IEEE.

关键词： Fuzzy set theory

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Fuzzy set theory based emergency control for power distribution systems

Fuzzy set theory based emergency control for power distribut...

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IEEE Winter Meeting Power engineering Society

作者： C.R. Cavati E.P. Ferreira P.Ya. Ekel Department of Electrical Engineering Federal University of Espirito Santo Vitoria Espirito Santo Brazil Post Graduate Program in Electrical Engineering Pontifical Catholic University of Minas Gerais Belo Horizonte Minas Gerais Brazil

关键词： Fuzzy set theory Control systems Power distribution Automatic control Open loop systems Automatic voltage control Voltage control Power system reliability Communication system control Transportation

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Multicriteria load management in power systems

Multicriteria load management in power systems

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International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT)

作者： P.Ya. Ekel L.D.B. Terra M.F.D. Junges A.V. Prakhovnik O.V. Razumovsky Post Graduate Program in Electrical Engineering Pontifical Catholic University of Minas Gerais Belo Horizonte Minas Gerais Brazil Institute for Energy Savings and Energy Management National Technical University Kharkov Polytechnic Institute Kiev Ukraine

The problems of power and energy shortage (natural or associated with the advisability of load management) allocation at different levels of territorial, temporal, and situational hierarchy of consumption control are formulated within the framework of multicriteria optimization models. This permits one to realize a new technology of load management providing consideration and minimization of diverse negative consequences of power and energy shortage allocation and creation of incentive influences for consumers. The solution of multicriteria problems is based on the Bellman-Zadeh approach to decision making in a fuzzy environment. The advantages and capabilities opened by its application are discussed. The results of the paper are realized within the framework of an adaptive interactive decision making system, which can be used in allocating diverse types of resources or their shortages.

关键词： Load management Power system management Resource management Decision making Power generation economics Environmental economics Electricity supply industry Energy management Telephony Electronic mail

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A Linear Matrix Inequality Approach to The Peak-to-Peak Guaranteed Cost Filtering Design

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IFAC Proceedings Volumes 2000年第14期33卷 29-34页

作者： Reinaldo M. Palhares Pedro L.D. Peres Jaime A. Ramírez Pontifical Catholic University of Minas Gerais Graduate Program in Electrical Engineering Av. Dom José Gaspar 500 Prédio 4 30535-610 Belo Horizonte MG Brazil School of Electrical and Computer Engineering University of Campinas CP 6101 13081-970 Campinas SP Brazil. Department of Electrical Engineering Federal University of Minas Gemis Av. Antônio Carlos 6627 31270-010 Belo Horizonte MG Brazil.

The problem of robust filtering design for uncertain linear systems with guaranteed peak-to-peak performance is addressed in this paper. The uncertain parameters are assumed to belong to convex bounded domains (i.e. polytope type uncertainty). The aim is to design a full-order stable linear filter that minimizes the worst-case peak value of the filtering error output signal with respect to all magnitude bounded noise inputs, in such way that the filtering error system remains robustly stable. The minimization provides an upper bound to the L ∞ induced gain ( ℓ ∞ for discrete-time systems) of the filtering error system. The conditions for the existence of such robust filter are provided in terms of linear matrix inequalities, allowing the use of standard convex optimization procedures to solve the problem. Both continuousand discrete-time systems are considered. The formulation presented is illustrated by examples.

关键词： Robust Estimation Filter Design Uncertain Linear Systems Peak-to-Peak Gain Linear Matrix Inequalities

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Fuzzy logic technology in reactive power control

Fuzzy logic technology in reactive power control

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International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT)

作者： P.Y. Ekel L.D.B. Terra M.F.D. Junges A.V. Prakhovnik F.J.A. De Oliveira A. Melek R. Kowaltschuk T.Y. Taguti Post Graduate Program in Electrical Engineering Pontifical Catholic University of Minas Gerais Belo Horizonte Minas Gerais Brazil Institute for Energy Savings and Energy Management National Technical University Kharkov Polytechnic Institute Kiev Ukraine Transmission System Operation Superintendence Parana State Energy Company Curitiba Parana Brazil

This paper presents results of research aimed at improving efficiency of coordinated on-line control of reactive power on the basis of developing models, methods, and a control system, integrating traditional numerical techniques with fuzzy logic technology. An approach associated with experimental design is considered to construct diverse types of sensitivity indices, which serve as the basis for multi-attribute evaluating efficiency of control actions and, therefore, for forming rules included in a knowledge base. Procedures related to classifying power system states are presented. Questions of the construction and tuning of linguistic variables as well as rational implementation of fuzzy logic procedures are discussed.

关键词： Fuzzy logic Reactive power control Power system modeling Fuzzy control Fuzzy set theory Power system control Power systems Control system synthesis Design for experiments Expert systems

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Robust H ∞ Filtering for Linear Continuous-Time Uncertain Systems With Multiple Delays: An LMI Approach

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IFAC Proceedings Volumes 2000年第14期33卷 249-254页

作者： Reinaldo M. Palhares Pedro L.D. Peres Carlos E. de Souza Pontifical Catholic University of Minas Gerais Graduate Program in Electrical Engineering Av. Dom José Gaspar 500 Prédio 4 30535-610 Belo Horizonte MG Brazil. School of Electrical and Computer Engineering University of Campinas CP 6101 13081-970 Campinas Sp Brazil Department of Systems and Control Laboratório Nacional de Computção Científica - LNCC Av. Getúlio Vargas 333 25651-070 Petrópolis RJ Brazil.

The problem of robust H ∞ filter design for uncertain continuous-time linear systems with multiple time-delayed states is addressed in this paper. The uncertainties are assumed to belong to convex bounded domains (polytope type uncertainty) and the time delays are supposed to be constant. Delay-independent as well as delay-dependent stability conditions assuring robust stability and a prescribed H ∞ disturbance attenuation for the filtering error system are established, in both cases, in terms of linear matrix inequalities, which can be efficiently solved by standard optimization procedures with global convergence assured. Two illustrative examples are analyzed.

关键词： Time-delay systems Delay-dependent stability Delay-independent stability Robust H ∞ filtering Linear matrix inequalities

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Fuzzy logic in voltage and reactive power control in power systems

Fuzzy logic in voltage and reactive power control in power s...

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IEEE Conference on Control Technology and Applications (CCTA)

作者： P.Ya. Ekel L.D.B. Terra M.F.D. Junges F.J.A. de Oliveira R. Kowaltschuk T.Y. Taguti Post Graduate Program in Electrical Engineering Catholic University of Minas Gerais Belo Horizonte Minas Gerais Brazil COPEL Transmission Parana State Energy Company Curitiba Parana Brazil

This paper presents results of research aimed at improving the efficiency of the coordinated online control of system voltage and reactive power on the basis of developing models, methods, and a control system, by integrating traditional numerical techniques with the fuzzy logic technology. An approach associated with experimental design is considered to construct diverse types of sensitivity indices, which serve as the basis for multi-attribute evaluating efficiency of control actions and, therefore, for forming rules included in knowledge base. Questions of the construction and tuning of linguistic variables as well as rational implementation of fuzzy logic procedures are discussed.

关键词： Fuzzy logic Reactive power control Power system control Power systems Voltage control Fuzzy control Power system modeling Control system synthesis Fuzzy set theory Expert systems

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Robust H/sub /spl infin// filtering design with pole constraints for discrete-time systems: an LMI approach

Robust H/sub /spl infin// filtering design with pole constra...

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American Control Conference (ACC)

作者： R.M. Palhares P.L.D. Peres Graduate Program in Electrical Engineering Ponificia Universidade Católica de Mines Gerais Belo Horizonte Minas Gerais Brazil DT-School of Electrical and Computer Engineering State University of Campinas-UNICAMP Sao Paulo Brazil

The problem of full order guaranteed cost H/sub /spl infin// filtering design for discrete-time systems with polytope type uncertainty is investigated. The main purpose is to obtain a stable linear filter such that the filtering error system remains quadratically stable within a prespecified H/sub /spl infin// attenuation level. Necessary and sufficient conditions for the existence of such robust filter are provided in terms of linear matrix inequalities (LMIs), which can be efficiently solved by means of high performance convex optimization procedures with global convergence assured. Moreover, as an improvement, the filter dynamics can be constrained to some specific regions inside the unit open disk.

关键词： Robustness Nonlinear filters Riccati equations Attenuation Filtering theory Electronic mail White noise Robust control Uncertainty Output feedback

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Robust filtering with guaranteed energy-to-peak performance — an LMI approach

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IFAC Proceedings Volumes 1999年第2期32卷 1814-1819页

作者： Reinaldo M. Palhares Pedro L.D. Peres Pontifícia Universidade Católica de Minus Gerais Graduate Program in Electrical Engineering Av. Dom José Gaspar 500 Prédio 4 30535-610 Belo Hotizonte - MG - Brazil School of Electrical and Computer Engineering University of Campinas DT/FEEC/UNICAMP - CP 6101 13.081-970 Campinas - SP - Brazil

The problem of robust energy-to-peak filtering for linear systems with convex bounded uncertainties is investigated in this paper. The main purpose is to design a full order stable linear filter that minimizes the worst-case peak value of the filtering error output signal with respect to all bounded energy inputs, in such way that the filtering error system remains quadratically stable Necessary and sufficient conditions arc formulated in terms of Linear Matrix Inequalities - LMIs, for both continuous- and discrete-time cases.

关键词： Robust Estimation Filter Design Uncertain Linear Systems Convex programming Energy-to-Peak Gain Linear- Matrix Inequalities

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