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International Conference on systems and control (ICSC)

作者： Sabir Ouchen Achour Betka Jean Paul Gaubert Sabrina Abdeddaim Electrical Engineering Laboratory of Biskra LGEB University of Mohammed Khider Algeria Laboratory of Computer Science and Automatic Control for Systems (LIAS-ENSIP) University of Poitiers France Electrical Engineering Laboratory of Biskra LGEB University of Mohammed Khider Biskra Algeria

In this paper, simulation and practical implementation of direct power control is presented for a PWM Rectifier application. The proposed DPC control has several advantages, including the grid current very close to si... 详细信息

ISBN: (纸本)9781509039616

关键词： Conferences control systems

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Comparison of various marker localization methods

Advances in Intelligent Systems and Computing

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Advances in Intelligent systems and Computing 2017年 461卷 87-103页

作者： Vestenický, Peter Mravec, Tomáš Vestenický, Martin Faculty of Electrical Engineering Department of Control and Information Systems University of Žilina Univerzitná 8215/1 Žilina01026 Slovakia Faculty of Electrical Engineering Department of Telecommunications and Multimedia University of Žilina Univerzitná 8215/1 Žilina01026 Slovakia

The presented paper is focused on analysis of two methods of marker localization. The markers are passive RFID transponders (without or with identification chip) consisting of tuned LC circuit and being used to mark and trace underground networks such as cables and pipes. Localization of the marker is based on evaluation of signal amplitude received from the excited marker, i.e. it is RSSI based localization method. The excitation of marker can be periodically repeated or continuous. In the first case the localization process consists of two stages—excitation and receiving of marker damped oscillations, in the second case the amplitude of continuously generated excitation signal is decreased by vicinity of the marker. Localization principle based on continuous marker excitation is analysed for serial or parallel resonant circuit of locator antenna. Both localization principles are mathematically analysed by modelling of their circuits using differential equations. The results of analysis are used to compare all methods and to evaluate their suitability for practical utilization. Whereas the markers have various working frequencies the analyses were done for all of them. © 2017, Springer International Publishing Switzerland.

关键词： Differential equations

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Reference-tracking feedforward control design for linear dynamical systems through signal decomposition

Reference-tracking feedforward control design for linear dyn...

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American control Conference

作者： Yanin Kasemsinsup Raffaele Romagnoli Marcel Heertjes Siep Weiland Hans Butler Control Systems Group Department of Electrical Engineering Control Engineering and System Analysis(SAAS) Universitè Libre de Bruxelles(ULB) Belgium Control Systems Technology Group Department of Mechanical Engineering Eindhoven University of Technology P.O. Box 513 5600 MB Eindhoven The Netherlands

ISBN: (纸本)9781509045839

In this work, we study a novel approach towards the reference-tracking feedforward control design for linear dynamical systems. By utilizing the superposition property and exploiting signal decomposition together with a quadratic optimization process, we obtain a feedforward design procedure for arbitrary linear multi-input and multi-output (MIMO) systems with arbitrary time/parameter-varying characteristics. In other words, the proposed algorithm is applicable to the broad class of linear systems, i.e. linear-time-invariant (LTI), linear-time-varying (LTV) and linear-parameter-varying (LPV) systems. The interplay between the initial state, feedforward and feedback actions are elaborated in detail. The potential of the presented methodology is demonstrated through simulation examples.

关键词： design linear dynamical signal resolution DYNAMICAL systems Linear design control FEEDFORWARD control Optimization Procedure design process FEEDFORWARD Linear system

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Optomechanically Induced Transparency at Exceptional Points

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Physical Review Applied 2018年第1期10卷 014006-014006页

作者： Hao Lü Changqing Wang Lan Yang Hui Jing Key Laboratory for Quantum Optics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha 410081 China University of Chinese Academy of Sciences Beijing 100049 China Department of Electrical and Systems Engineering Washington University St. Louis Missouri 63130 USA

We study optomechanically induced transparency in a microresonator coupled with nanoparticles. By tuning the relative angle of the nanoparticles, exceptional points (EPs) emerge periodically in this system and thus strongly modify both the transmission rate and the group delay of the signal. As a result, controllable slow-to-fast light switching can be achieved by manipulating external nanoparticles. This provides a new way to engineer EP-assisted optomechanical devices for applications in optical communications and signal processing.

关键词： Electromagnetically induced transparency Mechanical effects of light on material media Optomechanics Quantum optics Devices Optical microcavities PT-symmetry Whispering gallery mode resonators

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Coordinated control strategy of reactive power for large-scale wind power transmission by LCC-HVDC links

Coordinated control strategy of reactive power for large-sca...

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6th International Conference on Renewable Power Generation

作者： Wang, Zhibing Xu, Yang Wang, Xitian State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems China Electric Power Research Institute Beijing100192 China Department of Electrical Engineering Shanghai Jiao Tong University Shanghai200240 China

The intermittence and fluctuation of outputs of large-scale wind farms lead to significant problems in power transmission system by line-commuted converter high-voltage direct current (LCC-HVDC) links. Traditional reactive power compensation devices such as AC filters are not capable of adjusting reactive power balance continuously. This paper presents a coordinated reactive power control strategy to realise continuous adjustment. A synchronous condenser (SC) is applied in the DC converter station to cooperate with AC filters. The capacity of the SC is determined by the minimum capacity and dead zone of the AC filter unit, and cost saving is also taken into account. While power outputs of wind farms fluctuate, the setting value of DC power gets changed. The SC responses rapidly to reduce the reactive power exchange. When the reactive power demand is beyond the capacity of the SC, one AC filter unit operates and the SC readjusts to maintain the reactive power balance. The proposed control strategy is validated by simulation in PSCAD/EMTDC. © 2017 Institution of engineering and Technology. All rights reserved.

关键词： Reactive power

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Overview of groups forming methods for long student's project

Overview of groups forming methods for long student's projec...

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Strategic Partnership of Universities and Enterprises of Hi-Tech Branches (Science. Education. Innovations), IV Forum

作者： T. A. Minav Anastasia D. Stotskaya Department of Mechanical Engineering Aalto University Aalto Finland Department of Automatic Control Systems Saint Petersburg Electrotechnical University “1” St. Petersburg Russia

ISBN: (纸本)9781538625729

Lecturing is one of the most traditional methods for teaching in university which can be lacking of interaction and real life application. This is a reason to transition to small groups with objectives of project development are appearing in the end of many master thesis programs. These project-based courses are created for better prepare student engineers for engineering work practices. Starting from 1990s, project-based courses has become a regular part of most undergraduate engineering programs. In these courses, small groups provide opportunity for students to engage actively with learning, to enhance practical skills, and to develop 21 century skills such as critical thinking, oral communication, and collaboration. Consequently, all academic staff involved in supporting and supervising group-based student projects sometimes face problems in forming effective groups. This becomes even more difficult when the life of the group project spans between 2 to 10 months. Therefore, this research paper concentrates on reviewing methods for the formation of groups of students working in such lengthy projects in order to create guidance, which will help instructors to divide students into groups, and organize and coordinate the work dynamic among team members.

关键词： Education Mechanical engineering Oral communication Face Teamwork

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On input design for regularized LTI system identification: Power-constrained Input

arXiv

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arXiv 2017年

作者： Mu, Biqiang Chen, Tianshi Division of Automatic Control Department of Electrical Engineering Linköping University Linköping58183 Sweden School of Science and Engineering Chinese University of Hong Kong Shenzhen518172 China

Input design is an important issue for classical system identification methods but has not been investigated for the kernel-based regularization method (KRM) until very recently. In this paper, we consider in the time domain the input design problem of KRMs for LTI system identification. Different from the recent result, we adopt a Bayesian perspective and in particular make use of scalar measures (e.g., the A-optimality, D-optimality, and E-optimality) of the Bayesian mean square error matrix as the design criteria subject to power-constraint on the input. Instead to solve the optimization problem directly, we propose a two-step procedure. In the first step, by making suitable assumptions on the unknown input, we construct a quadratic map (transformation) of the input such that the transformed input design problems are convex, the number of optimization variables is independent of the number of input data, and their global minima can be found efficiently by applying well-developed convex optimization software packages. In the second step, we derive the expression of the optimal input based on the global minima found in the first step by solving the inverse image of the quadratic map. In addition, we derive analytic results for some special types of fixed kernels, which provide insights on the input design and also its dependence on the kernel structure. Copyright © 2017, The Authors. All rights reserved.

关键词： Linear systems

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On Asymptotic Properties of Hyperparameter Estimators for Kernel-based Regularization Methods

arXiv

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arXiv 2017年

作者： Mu, Biqiang Chen, Tianshi Ljung, Lennart Division of Automatic Control Department of Electrical Engineering Linköping University LinköpingSE-58183 Sweden School of Science and Engineering Chinese University of Hong Kong Shenzhen China

The kernel-based regularization method has two core issues: kernel design and hyperparameter estimation. In this paper, we focus on the second issue and study the properties of several hyperparameter estimators including the empirical Bayes (EB) estimator, two Stein’s unbiased risk estimators (SURE) and their corresponding Oracle counterparts, with an emphasis on the asymptotic properties of these hyperparameter estimators. To this goal, we first derive and then rewrite the first order optimality conditions of these hyperparameter estimators, leading to several insights on these hyperparameter estimators. Then we show that as the number of data goes to infinity, the two SUREs converge to the best hyperparameter minimizing the corresponding mean square error, respectively, while the more widely used EB estimator converges to another best hyperparameter minimizing the expectation of the EB estimation criterion. This indicates that the two SUREs are asymptotically optimal but the EB estimator is not. Surprisingly, the convergence rate of two SUREs is slower than that of the EB estimator, and moreover, unlike the two SUREs, the EB estimator is independent of the convergence rate of ΦT Φ/N to its limit, where Φ is the regression matrix and N is the number of data. A Monte Carlo simulation is provided to demonstrate the theoretical results. Copyright © 2017, The Authors. All rights reserved.

关键词： Asymptotic analysis

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Iteration complexity analysis of dual first-order methods for conic convex programming

Iteration complexity analysis of dual first-order methods fo...

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作者： Necoara, I. Patrascu, A. Automatic Control and Systems Engineering Department University Politehnica Bucharest Bucharest060042 Romania

In this paper we provide a detailed analysis of the iteration complexity of dual first-order methods for solving conic convex problems. When it is difficult to project on the primal feasible set described by conic and convex constraints, we use the Lagrangian relaxation to handle the conic constraints and then, we apply dual first-order algorithms for solving the corresponding dual problem. We give convergence analysis for dual first-order algorithms (dual gradient and fast gradient algorithms): we provide sublinear or linear estimates on the primal suboptimality and feasibility violation of the generated approximate primal solutions. Our analysis relies on the Lipschitz property of the gradient of the dual function or an error bound property of the dual. Furthermore, the iteration complexity analysis is based on two types of approximate primal solutions: the last primal iterate or an average primal sequence. © 2015 Taylor & Francis.

关键词： Convex optimization

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Frequency-driven market mechanisms for optimal dispatch in power networks

arXiv

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arXiv 2017年

作者： Stegink, Tjerk Cherukuri, Ashish de Persis, Claudio van der Schaft, Arjan Cortés, Jorge Center for Systems and Control University of Groningen Netherlands Automatic Control Laboratory ETH Zürich Department of Mechanical and Aerospace Engineering University of California San Diego United States

This paper studies real-time bidding mechanisms for economic dispatch and frequency regulation in electrical power networks. We consider a market administered by an independent system operator (ISO) where a group of strategic generators participate in a Bertrand game of competition. Generators bid prices at which they are willing to produce electricity. Each generator aims to maximize their profit, while the ISO seeks to minimize the total generation cost and to regulate the frequency of the system. We consider a continuous-time bidding process coupled with the swing dynamics of the network through the use of frequency as a feedback signal for the negotiation process. We analyze the stability of the resulting interconnected system, establishing frequency regulation and the convergence to a Nash equilibrium and optimal generation levels. The results are verified in the IEEE 14-bus benchmark case. Copyright © 2017, The Authors. All rights reserved.

关键词： Electric load dispatching

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