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2007 International Power engineering Conference (IPEC2007), vol.2

作者： Issarachai Ngamroo Panlert Lappanakul Nitus Voraphonpiput Sanchai Dechanupaprittha Yasunori Mitani Jareerat Sakulrat Department of Electrical Engineering Faculty of Engineering King Mongkut's Institute of Technology Ladkrabang Bangkok Thailand Power System Analysis Department Control and Protection Electricity Generating Authority of Thailand Thailand Department of Electrical Engineering Kyushu Institute of Technology Fukuoka Japan Department of Civil Engineering Prince of Songkla University Songkla Thailand

This paper presents the dynamic analysis results of a system event in Thailand power network using a wide-area monitoring system based on synchronized phasor measurement units (PMUs). The salient feature of the proposed monitoring system is the convenient installation of PMU at 220V wall power outlets. The event considering here is a 80MW load transferring from Thailand to Malaysia systems through a weak 115kV tie-line. To perform load transferring, a synchronization between both systems is required. This causes a problem of frequency osculation in a southern area of Thailand. Besides, this event severely excites the inter-area oscillation in a 230kV tie-line between central and southern areas of Thailand. Analyzed results based on discrete wavelet decomposition and short-time Fourier Transform provide valuable information of the system dynamic behavior in both frequency and time domains.

关键词： Synchronized Phasor measurement units Wide-area monitoring Inter-area oscillation Discrete wavelet decomposition Least-squares regression Short-time Fourier Transform

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POD-based state estimation of simulated moving bed chromatographic processes

POD-based state estimation of simulated moving bed chromatog...

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European control Conference (ECC)

作者： Boulaïd Boulkroune Michel Kinnaert Ali Zemouche Department of Control Engineering and System Analysis Universite Libre de Bruxelles (ULB) Roosevelt Brussels Belgium Centre de Recherche en Automatique de Nancy Nancy-Université Cosnes et Romain France

ISBN: (纸本)9781479901890

Chromatographic separation is a powerful technique based on the differential adsorption of the components of a mixture. In simulated moving bed (SMB) chromatographic processes, a counter-current movement of the liquid and the solid phases is achieved by periodically switching the inlet and the outlet ports in a closed loop of chromatographic columns. This paper addresses the problem of state observation of simulated moving bed (SMB) chromatographic processes. The proposed approach is based on a reduced model obtained via the proper orthogonal decomposition (POD) method. The state estimation is performed using a nonlinear observer designed for Lipschitz LPV (linear parameter varying) systems. Numerical simulations are provided to validate the proposed approach.

关键词： Mathematical model Observers Equations Switches Approximation methods Vectors Computational modeling

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Differential energy based microgrid protection against fault conditions

Differential energy based microgrid protection against fault...

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2012 IEEE PES Innovative Smart Grid Technologies, ISGT 2012

作者： Samantaray, S.R. Joos, Geza Kamwa, I. School of Electrical Sciences Indian Institute of Technology Bhubaneswar-751013 India Department of Electrical and Computer Engineering McGill University McConnell 633 3480 University Street Montreal QC H3A 2A7 Canada Hydro-Quebec/IREQ Power System Analysis Operation and Control Varennes QC J3X 1S1 Canada

ISBN: (纸本)9781457721588

A differential energy based fault protection in microgrid is presented in this paper. Initially the currents at the respective buses are retrieved and processed through a novel time-frequency transform known as S-transform to generate time-frequency contours. Spectral energy content of the time-frequency contours of fault current signals are calculated and differential energy is computed to register the fault patterns in the microgrid at grid-connected and islanded mode. The proposed scheme is tested for different shunt faults (symmetrical and unsymmetrical) and High Impedance Faults (HIF) in the microgrid with radial and loop structure. The results based on extensive study indicate that the differential energy based protection scheme can reliably protect the microgrid against different fault situations. © 2012 IEEE.

关键词： Mathematical transformations

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Mathematical modeling and decision-making on controlling modes of technological objects in the fuzzy environment

Mathematical modeling and decision-making on controlling mod...

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World Congress on Intelligent control and Automation (WCICA)

作者： Y. A. Ospanov B. B. Orazbayev K. N. Orazbayeva N. S. Mukataev A. I. Demyanenko Department of System Analysis and Control L.N. Gumilyov Eurasian National University Astana Kazakhstan Department of Management Kazakh University of Economics Astana Kazakhstan Department of Automation and Electrical Engineering Shakarim State University of Semey Semey Kazakhstan

ISBN: (纸本)9781467384155

This paper proposes methods for the development of mathematical models and for the control of operation modes of technological objects in oil refinery in face of uncertainty based on fuzzy information. The mathematical formulation of the problem of decision-making on controlling modes, which are solved on the basis of mathematical modeling, is formalized and obtained. By using the example of the problem of decision-making on optimal operation modes of technological complex for the benzene production and based on the methods of fuzzy mathematics an algorithm of its solution is developed. The initial problem is formalized as a problem of decision-making in the fuzzy environment, since the investigated object is characterized by multicriteriality and frequently functions in a fuzzy environment. The mathematical formulation of the problem of object's mode selection in the fuzzy environment and the heuristic algorithm of its solution is obtained by modifying various optimality principles based on methods of the fuzzy sets theory.

关键词： Mathematical model Decision making Production Fuzzy sets Data models Pragmatics Numerical models

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Nonlinear and Linearized Full Horizon State Observers - Application to Bioprocesses

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IFAC Proceedings Volumes 2000年第10期33卷 371-376页

作者： Ph. Bogaerts R. Hanus Université Libre de Bruxelles Control Engineering and System Analysis Department Av. F.-D. Roosevelt 50 C.P. 165/55 B-1050 Brussels (Belgium) tel: 32-2-650.26.75 fax: 32-2-650.26.77

The state estimation of full horizon observers is based on the identification of the most likely initial state of the process, this latter being identified at each time where new measurements are available. On the one hand, a nonlinear version of this observer is given together with its properties. It has the advantage to consist of a real nonlinear approach (without any approximation of the nonlinear model of the process). On the other hand, a linearized version is proposed, based on a recursive most likelihood estimation of the initial state. This latter estimator does not need to solve a nonlinear optimisation problem at each new sample time anymore. These approaches are illustrated in the case of the biomass concentration estimation within CHO animal cell cultures, for which only rare and asynchronous measurement samples of the glutamine, glucose and lactate concentrations are available.

关键词： state observers maximum likelihood estimators nonlinear systems biotechnology

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State of Charge Estimation of Parallel Connected Battery Cells via Descriptor system Theory

State of Charge Estimation of Parallel Connected Battery Cel...

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American control Conference

作者： Dong Zhang Luis D. Couto Sebastien Benjamin Wente Zeng Daniel F. Coutinho Scott J. Moura Department of Civil and Environmental Engineering University of California Berkeley California USA Department of Control Engineering and System Analysis Université Libre de Bruxelles Brussels Belgium Saft Batteries Total S.A. Total S.A. Department of Automation and Systems UFSC Florianópolis SC Brazil

ISBN: (数字)9781538682661

ISBN: (纸本)9781538682678

This manuscript presents an algorithm for individual Lithium-ion (Li-ion) battery cell state of charge (SOC) estimation when multiple cells are connected in parallel, using only terminal voltage and total current measurements. For battery packs consisting of thousands of cells, it is desirable to estimate individual SOCs by only monitoring the total current in order to reduce sensing cost. Mathematically, series connected cells yield dynamics given by ordinary differential equations under classical full voltage sensing. In contrast, parallel connected cells are evidently more challenging because the dynamics are governed by a nonlinear descriptor system, including differential equations and algebraic equations arising from voltage and current balance across cells. This paper designs and analyzes an observer with linear output error injection, where the individual cell SOCs and local currents are locally observable from the total current and voltage measurements. The asymptotic convergence of differential and algebraic states is established by considering local Lipschitz continuity property of system nonlinearities. Simulation results on LiNiMnCoO_2/Graphite (NMC) cells illustrate convergence for SOCs, local currents, and terminal voltage.

关键词： Batteries Mathematical model State of charge Observers Current measurement Integrated circuit modeling

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Expert Search Framework for the Task of Building an Expert Panel in Educational Organizations

Expert Search Framework for the Task of Building an Expert P...

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Ural Symposium on Biomedical engineering, Radioelectronics and Information Technology (USBEREIT)

作者： Andrey Sozykin Tatiana Oreskhina Alexander Detkov Evgeniy Komockiy Engineering School of IT Telecom and Control Systems Ural Federal University Yekaterinburg Russia Institute of Fundamental Education Ural Federal University Yekaterinburg Russia Department Of System Analysis And Decision Making Ural Federal University Yekaterinburg Russia

ISBN: (数字)9781728131658

ISBN: (纸本)9781728131665

Development of curriculum in the universities, and search of good-skilled experts to evaluate project education results consume large amounts of time for faculty members. The article proposes a universal framework that facilitates this task by automating the process of finding companies that can provide such experts. The proposed approach is characterized by a high degree of automation and formalization, because it uses the data of financial statements of companies in a given industry in its work. Thanks to the use of statistical data and methods, the objectivity and reliability of the search for experts increases. As data source uses the data set “Accounting (financial) statements of enterprises and organizations for 2018” provided by Rosstat. The proposed approach was successfully tested in the course of attracting experts to evaluate the results of a design workshop for students of the Ural Federal University in 2019. During testing, the top 40 IT companies of the Sverdlovsk region were selected. From the 40 organizations, 7 companies agreed to respond to the proposal, which determined to 17.5% of the sample. At the same time, 19 experts were sent from this organizations, which amounted to 65.5 % of all exerts who agreed to participate in the event. Thus, the proposed approach can significantly expand the composition of the expert base and attract experts based on a strictly formalized, objective approach.

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Robust fault diagnosis for a class of nonlinear descriptor systems

Robust fault diagnosis for a class of nonlinear descriptor s...

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Conference on control and Fault-Tolerant systems (SysTol)

作者： B. Boulkroune A. Zemouche Department of Control Engineering and System Analysis Université Libre de Bruxelles Brussels Belgium Centre de Recherche en Automatique de Nancy CRAN CNRS UMR 7039 Nancy Universitè Cosnes-et-Romain France

The paper addresses the problem of designing a robust fault detection filter (RFDF) for a class of nonlinear descriptor systems whose nonlinear term are globally Lipschitz and linear term described by a linear parameter varying (LPV) form. The influence of perturbations on the residuals is minimized using the H ∞ norm while the sensitivity performance is guaranteed using the H ∞ index. Based on the Lyapunov stability theory, the design problem is formulated as a convex optimization problem and solved via linear matrix inequality (LMI) techniques. Performances of the proposed filter are shown through the application to an activated sludge process model.

关键词： Fault detection Robustness Silicon compounds Indexes Sludge treatment Sensitivity Nonlinear systems

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Differential energy based microgrid protection against fault conditions

Differential energy based microgrid protection against fault...

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Innovative Smart Grid Technologies (ISGT)

作者： S.R. Samantaray Geza Joos I. Kamwa School of Electrical Sciences Indian Institute of Technology Bhubaneswar India Department of Electrical and Computer Engineering McGill University Montreal QUE Canada Hydro-Quebec/IREQ Power System Analysis Operation and Control Varennes QUE Canada

关键词： Time frequency analysis Fault currents Pattern recognition Impedance Wavelet transforms Mathematical model

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Theory and characteristics of novel variable reluctance 1X resolver

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ELECTRICAL engineering IN JAPAN 1996年第5期116卷 128-137页

作者： Ishizaki, A Takasaki, K Shimomura, S Masaki, K Kitazawa, K Tokyo Denki University The Polytechnic University Tamagawa Seiki Co. Ltd. [?]Graduated in 1948 from the Department of Electrical Engineering Tokyo Institute of Technology and received his Dr. of Eng. degree from the same university. He joined Meidensha Corporation in April 1948. He has engaged in research development and design of rotating machines. He became a General Manager of the First Division at Research Laboratory in 1965 a Plant Manager of Ohsaki Works in 1974 and a Director in 1977. He became a Professor in the Department of Electrical Engineering Nagaoka University of Technology in 1981. He has been a Professor on the Faculty of Engineering Tokyo Denki University since 1990. He is engaged mainly in the analysis of rotating machines using finite element method as well as research on the optimization of the rotating machines and their control as a system. He is a member of IEEE.

Although brushless resolvers have been used widely as angular position transducers, they are expensive due to their intricate construction, involving a rotary transformer to supply the exciting coils wound on the rotor poles with the current. It is shown theoretically in this paper that the resolver without rotary transformer or brushes can be realized by simple construction, which consists of the stator core with both 4-poles exciting windings and 2-poles output ones and the rotor core carrying no windings. In this resolver the rotor core has minimum gap at one side and a maximum gap at another side of the diameter. It is characterized by an outer surface form that makes the fluctuation part of gap permeance very in proportion to cos theta, where theta represents the angular position of a point in the air gap with respect to the origin on the rotor, the point of minimum air gap. The method determining the rotor form to embody the afore-mentioned gap permeance variation is also shown. It has been confirmed not only by simulation but also experiment that the 2-phase output voltages of a model designed based on the theory have sinusoidal waveforms with very small harmonic contents. Moreover, the rotor position detected by processing the output voltages through the conventional resolver/digital converter was within acceptable engineering accuracy.

关键词： resolver VR type rotating position detection optimal rotor shape electrical error

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