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The study and design of inter-harmonic detection device based on quasi-synchronous technique in power system

Computer Modelling and New Technologies 2014年第11期18卷 1421-1424页

作者： Fan, Zheng Zheng, Xianfeng Faculty of Electrical Engineering Henan Mechanical and Electrical Engineering College Xinxiang Henan China Faculty of Automatic Control Engineering Henan Mechanical and Electrical Engineering College Xinxiang Henan China

On the basis of analyzing the characteristics of harmonic signals, the inter-harmonic detection algorithm of quasi-synchronous sampling is introduced in this paper. This algorithm pre-processes the original sampled signal and separates all the harmonics and inter-harmonics of the reconstructed signal with designed comb FIR filters, to restrain the mutual interference between them, and finally achieve accurate measurement of harmonic and inter-harmonic in power system. At last, the validity of this algorithm is verified with harmonic and inter-harmonic signal generated from standard signal source.

关键词： FIR filters

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Remote administration of hardware resources using TCP/IP protocol and WEB technologies

Remote administration of hardware resources using TCP/IP pro...

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International Conference and Exposition on electrical and Power engineering (EPE)

作者： Catalin Damian Eduard Lunca Mircea Ilinca Faculty of Electrical Engineering Technical University of Iasi Romania Faculty of Automatic Control and Computer Engineering Technical University of Iasi Romania

This paper presents a combination of programming languages and web technologies used to deploy a modern remote controlled system. The hardware part of the system is a parallel port interface board that contains different types display devices, user-input components and some relays. The system functionality is based on some software applications developed using different techniques: the communication between the parallel interface, local computer and webserver PC is based on standard C, the user interface is developed using php, mysql, html and javascript technologies. Users can access full resources of the system if they are registered or only some demonstration and training sections as guest users.

关键词： Hardware IP networks Computers Databases Ports (Computers) Software Servers

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Design of Continuous-time controllers using Cartesian Genetic Programming

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IFAC Proceedings Volumes 2014年第3期47卷 6982-6987页

作者： Branislav Kadlic Ivan Sekaj Daniel Pernecký Institute of Control and Industrial Informatics Faculty of Electrical Engineering and Information Technology Slovak University of Technology Bratislava Slovak Republic

An evolutionary computation - based design/optimisation approach using the Cartesian Genetic Programming is proposed for non-linear continuous-time process control. It is a simplification of a more general Genetic Programming – based design, which is powerful, but more computationally demanding. The approach is able to produce effective and non-intuitive controllers in the form of a network of interconnected elementary building blocks, which minimize the defined performance index. Each building block performs mathematic operations between its inputs, next it contains gain and an elementary dynamic part as integrator, derivative or unity gain. The proposed design method is demonstrated on water turbine control design, and the results are compared with the genetic algorithm-based PID controller design.

关键词： cartesian genetic programming continuous-time control controller structure design control performance optimization non-linear systems

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Implementation of software changes in programming techniques learning

Implementation of software changes in programming techniques...

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International Conference and Exposition on electrical and Power engineering (EPE)

作者： Catalin Damian Mircea Ilinca Faculty of Electrical Engineering Technical University of Iasi Romania Faculty of Automatic Control and Computer Engineering Technical University of Iasi Romania

This paper presents a study about how efficient implementation of software changes helps students to better understanding of programming techniques and algorithms. The study is performed during last three years on first year students, considering applications classes for two first year courses: computer programming part I and part II. There are taken into account some partial results during the semester, final exams and also some questionnaires accomplished by students. The ratings for this study are imported from a database. The study is regarding around eight hundred students.

关键词： Education Programming profession Mathematical model Encoding Computer languages Software

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An H∞-norm-based approach for operating point selection and LPV model identification from local experiments

Periodica polytechnica Electrical engineering and computer s...

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Periodica polytechnica electrical engineering and computer science 2014年第3期58卷 121-131页

作者： Vízer, Dániel Mercère, Guillaume Departement of Control Engineering and Informatics Faculty of Electrical Engineering and Informatics Budapest University of Technology and Economics Magyar tudósok krt. 1-3 BudapestH-1117 Hungary University of Poitiers Laboratoire d'Informatique et d'Automatique Pour Les Systèmes 2 rue P. Brousse bâtiment B25 TSA 41105 Poitiers Cedex 986073 France

When the identification of linear parameter-varying (LPV) models from local experiments is considered, the question of the necessary number of local operating points as well as the problem of the efficient interpolation of the locally-estimated linear time-invariant models arise. These challenging problems are tackled herein by using the H∞-norm. First, thanks to the nu-gap metric, an heuristic technique is introduced to optimize the number as well as the position of the local operating points (along a given trajectory of the scheduling variables) with respect to the information brought by the local models. Having access to a reliable set of local models, the second step of the procedure, i.e., the parameter estimation step, consists of the optimization a second H∞-norm-based cost function measuring the fit between the local information (represented by the locally-estimated LTI models) and the local behavior of a parameterized global LPV model. A special attention is given to parameterized LPV models satisfying a fully-parametrized or a physically-structured linear fractional representation. © 2014, Technical University of Budapest. All rights reserved.

关键词： Cost functions

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Trajectory planner for mobile robots using particle swarm optimization

Trajectory planner for mobile robots using particle swarm op...

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International Conference on System Theory, control, and Computing (ICSTCC)

作者： Razvan Solea Daniela Cernega Faculty of Automatic Control Computers Electrical and Electronics Engineering “Dunarea de Jos” University of Galati Romania

The trajectory planning problem is an essential one in robotics. In order to solve this problem, a temporal motion law for a given geometric path has to be defined and a set of requirements for the trajectory has to be fulfilled. The motion planning of a mobile robot must be more than just collision-free: it must be fast, safe and easy to use. For the trajectory planning problem, minimum time to achieve the goal is an important criterion. This paper proposes an original trajectory planning approach using quintic splines in a real environment with several obstacles. The proposed trajectory planning approach is based on the optimization of parameters of the quintic splines using Particle Swarm Optimization. The quintic-splines are ideal since they give continuity in position, heading, curvature, velocity, and acceleration ensuring a smooth movement of the mobile robot. The trajectory planning must provide not only the planning of the path (spatial dimension) but also the speed profile (temporal dimension). The effectiveness of the proposed planner is proved with suitable examples. The experiments show that the proposed planner is able to provide a smooth trajectory.

关键词： Trajectory Acceleration Planning Splines (mathematics) Mobile robots

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Urysohn measure driven integral equations in the space of bounded variation functions and applications

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AIP Conference Proceedings 2016年第1期1773卷

作者： G. Dimitriu B. Satco 1Department of Mathematics and Informatics Grigore T. Popa University of Medicine and Pharmacy Universităţii 16 Iaşi 700115 Romania 2Faculty of Electrical Engineering and Computer Science Ştefan cel Mare University of Suceava Universităţii 13 Suceava 720229 Romania 3Integrated Center for Research Development and Innovation in Advanced Materials Nanotechnologies and Distributed Systems for Fabrication and Control (MANSiD) Ştefan cel Mare University Suceava Romania

Motivated by the fact that bounded variation (often discontinuous) functions frequently appear when studying integral equations that describe physical phenomena, we focus on the existence of bounded variation solutions for Urysohn integral measure driven equations. Due to numerous applications of Urysohn integral equations in various domains, problems of this kind have been extensively studied in literature, under more restrictive assumptions. Our approach concerns the framework of Kurzweil-Stieltjes integration, which allows the occurrence of high oscillatory features on the right hand side of the equation. A discussion about interesting consequences of our main result (given by particular cases of the measure driving the equation) is presented. Finally, we show the generality of our results by investigating two examples of impulsive type problems (from both theoretical and numerical perspective) and giving an application in electronics industry concerning polarization properties of ferroelectric materials.

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A New Five-Level Rectifier based on Parallel Switching Cells and Stacked Coupled Inductors

A New Five-Level Rectifier based on Parallel Switching Cells...

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International Conference on Optimazation of electrical and Electronic Equipment

作者： Dan FLORICAU Ciprian VLAD Faculty of Electrical Engineering University Politehnica of Bucharest Romania Department of Automatic Control and Electrical Engineering "Dunarea de Jos" University of Galati Romania

ISBN: (纸本)9781479951840

In this paper a new AC/DC unidirectional switching cell with five voltage levels is proposed. It is called 5L-Stacked-Coupled-Inductors (5L-SCI) cell and can be connected between an AC current source and a DC voltage source. The novelty of 5L-SCI topology is based on two cascaded stages that work at different currents and different switching-frequency. The first stage contains two diodes that operate at high-current and low-frequency. The second stage works at low-current and high-frequency and contains two stacked groups of basic switching cells parallel connected by means of coupled-inductors. An interesting property of the 5L-SCI switching cell is the use of stacked groups which work alternatively on a half-cycle. Thus, the active power devices that form the stacked groups switch only half of cycle. The operation principle of the 5L-SCI cell is verified by numerical simulations both for single- and for three-phase unity-power-factor PWM rectifiers.

关键词： AC/DC 5L-SCI PWM

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Embedding of nonlinear systems in a linear parameter-varying representation 19

Embedding of nonlinear systems in a linear parameter-varying...

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19th IFAC World Congress on International Federation of automatic control, IFAC 2014

作者： Abbas, Hossam S. Tóth, Roland Petreczky, Mihály Meskin, Nader Mohammadpour, Javad Department of Electrical Engineering College of Engineering Qatar University PO Box 2713 Doha Qatar Control Systems Group Eindhoven University of Technology P.O. Box 513 Eindhoven5600 MB Netherlands Department of Computer Science and Automatic Control Ecole des Mines de Douai Douai59508 France Intelligent Control Systems Lab. College of Engineering University of Georgia AthensGA30602 United States Electrical Engineering Department Faculty of Engineering Assiut University Assiut Egypt

ISBN: (纸本)9783902823625

This paper introduces a systematic approach to synthesize linear parameter-varying (LPV) representations of nonlinear (NL) systems which are originally defined by control affine state-space representations. The conversion approach results in LPV state-space representations in the observable canonical form. Based on the relative degree concept of NL systems, the states of a given NL representation are transformed to new coordinates that provide its normal form. In the SISO case, all nonlinearities of the original system are embedded in one NL function which is factorized to construct the LPV form. An algorithms is proposed for this purpose. The resulting transformation yields an LPV model where the scheduling parameter depends on the derivatives of the inputs and outputs of the system. In addition, if the states of the NL model can be measured or estimated, then the procedure can be modified to provide LPV models scheduled by these states. Examples are included for illustration. © IFAC.

关键词： State space methods

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Rigorous using of calibration

Rigorous using of calibration

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International Carpathian control Conference (ICCC)

作者： Javůrek Milan Taufer Ivan Department of Process Control Faculty of Electrical Engineering and Informatics University of Pardubice Pardubice Czech Republic

Calibration is one of the most frequently used laboratory procedures. Thanks to immense development of measuring techniques at present, the measurement procedures have become easier both quantitatively and qualitatively, i.e. the trueness and accuracy of measurements and their speed have increased; hence the amount of experimental data has multiplied. Along with experimental techniques, the techniques of evaluation have also improved: available computer programs cover absolute majority of mathematical evaluation methods. In the profusion of outputs, the application conditions of the methods used are somewhat eluding, and the results obtained often have limited applicability. Therefore, it is necessary to become aware of the fact that for practical use the methods have to be clear, straightforward and exact, i.e. it has to be known what can be neglected as marginal and what cannot.

关键词： Calibration Polynomials Reliability Belts Standards Vectors Measurement uncertainty

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