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An Adaptive Predictive control Strategy for RMPPT under Partially Shaded Conditions

IFAC Proceedings Volumes 2014年第3期47卷 4947-4952页

作者： Chao Ma Jing Wu Ning Li Shaoyuan Li Kang Li Department of Automation Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai China School of Electronics Electrical Engineering and Computer Science Queen's University Belfast UK

As one of key technologies in photovoltaic converter control, Maximum Power Point Tracking (MPPT) methods can keep the power conversion efficiency as high as nearly 99% under the uniform solar irradiance condition. However, these methods may fail when shading conditions occur and the power loss can over as much as 70% due to the multiple maxima in I – P curve in shading conditions v.s. single maximum point in uniformly solar irradiance. In this paper, a Real Maximum Power Point Tracking (RMPPT) strategy under Partially Shaded Conditions (PSCs) is introduced to deal with this kind of problems. An optimization problem, based on a predictive model which will change adaptively with environment, is developed to tracking the global maxima and corresponding adaptive control strategy is presented. No additional circuits are required to obtain the environment uncertainties. Finally, simulations show the effectiveness of proposed method.

关键词： Photovoltaic systems RMPPT Partial shading Adaptive predictive control

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Delay-Robustness in Distributed control of Timed Discrete-Event systems Based on Supervisor Localization

Delay-Robustness in Distributed Control of Timed Discrete-Ev...

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IEEE Annual Conference on Decision and control

作者： Renyuan Zhang Kai Cai W.M. Wonham School of Automation Northwestern Polytechnical University China Urban Research Plaza Osaka City University Japan Systems Control Group Department of Electrical and Computer Engineering University of Toronto Canada

ISBN: (纸本)9781467360890

Recently we studied communication delay in distributed control of untimed discrete-event systems based on supervisor localization. We proposed a property called delay-robustness: the overall system behavior controlled by distributed controllers with communication delay is logically equivalent to its delay-free counterpart. In this paper we extend our previous work to timed discrete-event systems, in which communication delays are counted by a special clock event tick. First, we propose a timed channel model and define timed delay-robustness;for the latter, a polynomial verification procedure is presented. Next, if the delay-robust property does not hold, we introduce bounded delay-robustness, and present an algorithm to compute the maximal delay bound (measured by number of ticks) for transmitting a channeled event. Finally, we demonstrate delay-robustness on the example of an under-load tap-changing transformer.

关键词： decentralised control discrete event systems system behavior Tautologous Supervisors Verification routine Ticks channel model delay Communication Research

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Enabling decentralised microblogging through P2PVPNs

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International Journal of Security and Networks 2013年第3期8卷 169-178页

作者： St Juste, Pierre Eom, Heungsik Woodruff, Benjamin Baker, Corey Figueiredo, Renato Advanced Computing and Information Systems Lab Wireless and Mobile Systems Laboratory Department of Electrical and Computer Engineering Florida United States

The need for user privacy in social networks has prompted the exploration of social networking designs which do not rely on the common centralised client-server model. Many peer-to-peer microblogging solutions have been proposed and/or implemented utilising various technologies such as DHTs, multicast trees, and/or gossip protocols. We propose a decentralised microblogging service that leverages available Peer-to-Peer Virtual Private Networking (P2PVPN) technologies. By leveraging the private IP connectivity of P2PVPNs, our design utilises both IP multicasting and data replication through high degree nodes to ensure that peers are able to publish messages with varying degree of scope. We study the implications of our data dissemination model for a decentralised microblogging service through simulation-based analysis using a 3-million user social graph from Orkut. We also developed a prototype implementation to demonstrate the feasibility of our design choices along with a small deployment on FutureGrid to test its performance on the internet. Copyright © 2013 Inderscience Enterprises Ltd.

关键词： Multicasting

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A Framework for the Nonlinear control of Dual-Stage systems

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IFAC Proceedings Volumes 2014年第3期47卷 1140-1145页

作者： Aurélio T. Salton Jeferson V. Flores João M. Gomes da Silva Jinchuan Zheng Zhiyong Chen Group of Automation and Control Systems (GACS) Pontifícia Universidade Católica do Rio Grande do Sul Brazil Department of Electrical Engineering Universidade Federal do Rio Grande do Sul Brazil Faculty of Engineering and Industrial Sciences Swinburne University of Technology Australia School of Electrical Engineering and Computer Science The University of Newcastle Australia

This paper presents a framework for the nonlinear control of dual-stage actuators (DSA). Motivated by various nonlinear controllers that make use of sector bounded and £ ∞ nonlinearities for the control of saturated linear systems, a methodology for integrating such nonlinear functions in order to improve the performance of DSA is presented. The stability of the closed-loop system is assessed by casting the nonlinearities in a mixed sector-bounded plus quasi-Linear Parameter Varying (LPV) framework, leading to a set of linear matrix inequalities (LMIs) to be satisfied by the controller parameters. Taking advantage of the developed framework, a new £ ∞ function is proposed to avoid the saturation of the secondary actuator. Simulation results illustrate the validity of the proposed framework and its potential for the performance improvement of DSA.

关键词： DSA Nonlinear Feedback Time-Optimal Performance Macro-Micro Manipulator

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Performance Improvement in Communication-Based Train control (CBTC) systems using Cognitive control

Performance Improvement in Communication-Based Train Control...

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IEEE International Conference on Intelligent Transportation systems

作者： Wenzhe Sun F. Richard Yu Tao Tang State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University P.R. China Department of Systems and Computer Engineering Carleton University Ottawa ON Canada

Communication-Based Train control (CBTC) systems use bidirectional train-wayside wireless communications to ensure the safe operation of rail vehicles. Due to unreliable wireless networks, the uncertainties in train status information leads to imperfect traction/braking commands, which will affect CBTC performance. In this paper, we use recent advance in cognitive control to positively improve control performance as well as reduce information uncertainties. A cognitive control system composed of Networked control System (NCS)-based state-space model and entropic-state model is presented. The performance optimization problem based on communication period decision and Medium Access control (MAC)-layer parameters adaption is formulated as a stochastic control process. Minimizing the energy consumption and information uncertainties is the objective of our model. Simulation result shows that the proposed cognitive control scheme can improve CBTC performance.

关键词： control systems Delays Uncertainty Adaptation models Wireless networks Rails State-space methods

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On the Estimation of the Domain of Attraction for Saturated systems via Partitioning of the Input Space

On the Estimation of the Domain of Attraction for Saturated ...

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第三十三届中国控制会议

作者： Yuanlong Li Zongli Lin Department of Automation and Key Laboratory of System Control and Information Processing of the Ministry of EducationShanghai Jiao Tong University Charles L.Brown Department of Electrical and Computer Engineering University of Virginia

ISBN: (纸本)9781479947249

This paper revisits the problem of estimating the domain of attraction for systems with saturation *** divide the input space into several regions. In one of these regions, none of the inputs saturate. In each of the remaining regions, there is a unique input that saturates everywhere with the time-derivative of its saturated signal being zero. These special properties of the inputs in different regions of the input space are combined with an existing piecewise quadratic Lyapunov functions that contains the information of input saturation to arrive at a set of less conservative stability conditions, from which a larger level set of the piecewise quadratic Lyapunov function can be obtained as an estimate of the domain of *** results indicate that the proposed approach has the ability to obtain a significantly larger estimate of the domain of attraction than the existing methods.

关键词： Actuator saturation,constrained control,domain of attraction,input saturation,piecewise quadratic Lyapunov functions,stability analysis

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Finite-time stabilization for a class of stochastic high-order nonlinear systems

Finite-time stabilization for a class of stochastic high-ord...

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World Congress on Intelligent control and Automation (WCICA)

作者： Junyong Zhai Ruting Jia Key Laboratory of Measurement and Control of CSE MoE Southeast University Nanjing Jiangsu China Electrical Engineering and Computer Science Department McNeese State University Lake Charles LA

This paper discusses the problem of global finite-time output feedback stabilization in probability for a class of stochastic high-order nonlinear systems. A homogeneous observer and controller are constructed for the nominal system based on the stochastic Lyapunov theorem and the adding one power integrator technique. Then, a scaling gain is introduced into the homogenous observer and controller to render the closed-loop system to be globally finite-time stable in probability. A simulation example is given to illustrate the effectiveness of the proposed design scheme.

关键词： Nonlinear systems Output feedback Closed loop systems Educational institutions Observers Aerospace electronics

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Virus-like-particles for next generation micro/nano-biosensors

Virus-like-particles for next generation micro/nano-biosenso...

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2014 Solid-State Sensors, Actuators and Microsystems Workshop, Hilton Head 2014

作者： Fan, X.Z. Naves, L. Siwak, N.P. Brown, A. Culver, J. Ghodssi, Reza MEMS Sensors and Actuators Laboratory Departments of Electrical and Computer Engineering Institute for Systems Research University of Maryland College ParkMD20742 United States Institute for Bioscience and Biotechnology Research University of Maryland College ParkMD20742 United States Fischell Department of Bioengineering University of Maryland College ParkMD20742 United States

ISBN: (纸本)9781940470016

A novel Virus-like-particle (VLP) bioreceptor layer has been integrated with an optical microdisk resonator platform for biosensing applications. This bioreceptor layer can be genetically programmed for selective binding. An optical microdisk resonator has been functionalized for antibody binding with this receptor, demonstrating resonant frequency shifts of (Δfo) of 0.79 nm and 5.95nm after primary antibody binding and full enzyme linked immunosorbent assay (ELISA), respectively. These shifts are more than 300% higher compared to the non-specific binding of a control (non-conjugated) bioreceptor layer. The sensitivity of the optical resonator to detect primary antibody binding without the additional ELISA steps demonstrates the feasibility of this platform for rapid and simplified immunoassays on a chip. © 2014TRF.

关键词： Actuators

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The importance of behavior theory in control system modeling of physical activity sensor data

The importance of behavior theory in control system modeling...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： William T. Riley A. Cesar Martin Daniel E. Rivera The National Cancer Institute National Institutes of Health Bethesda MD USA School of Electrical Computer and Energy Engineering Arizona State University Tempe AZ Control Systems Engineering Laboratory Transport and Energy Arizona State University Tempe AZ Arizona State University Tempe AZ US Control Systems Engineering Laboratory School of Engineering of Matter Transport and Energy Arizona State University Tempe AZ

Among health behaviors, physical activity has the most extensive record of research using passive sensors. control systems and other system dynamic approaches have long been considered applicable for understanding human behavior, but only recently has the technology provided the precise and intensive longitudinal data required for these analytic approaches. Although sensors provide intensive data on the patterns and variations of physical activity over time, the influences of these variations are often unmeasured. Health behavior theories provide an explanatory framework of the putative mediators of physical activity changes. Incorporating the intensive longitudinal measurement of these theoretical constructs is critical to improving the fit of control system model of physical activity and for advancing behavioral theory. Theory-based control models also provide guidance on the nature of the controllers which serve as the basis for just-in-time adaptive interventions based on these control system models.

关键词： Computational modeling Adaptation models Biological system modeling control systems Testing Adaptive systems

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Bayesian networks to support the management of patients with ASCUS/LSIL pap tests

Bayesian networks to support the management of patients with...

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EAI International Conference on Wireless Mobile Communication and Healthcare (Mobihealth)

作者： Panagiotis Bountris Charalampos Tsirmpas Maria Haritou Abraham Pouliakis Petros Karakitsos Dimitrios Koutsouris The Biomedical Engineering Laboratory School of Electrical and Computer Engineering National Technical University of Athens Athens Greece The Institute of Communication and Computer Systems National Technical University of Athens Athens Greece The Department of Cytopathology University of Athens Athens Greece

In the majority of cases, cervical cancer (CxCa) develops as a result of underestimated abnormalities in the Pap test. Nowadays, there are ancillary molecular biology techniques providing important information related to CxCa and the Human Papillomavirus (HPV) natural history, including HPV DNA test, HPV mRNA tests and immunocytochemistry tests. However, these techniques have their own performance, advantages and limitations, thus a combinatorial approach via computational intelligence methods could exploit the benefits of each method and produce more accurate results. In this paper we present a risk assessment model based on a Bayesian Network which, by combining the results of Pap test and ancillary tests, may identify women at true risk of developing cervical cancer and support the management of patients with ASCUS or LSIL cytology. The model, following the paradigm of other implemented systems, can be integrated into existing platforms and be available on mobile terminals for anytime/anyplace medical consultation.

关键词： Bayes methods Educational institutions DNA Inference algorithms Risk management Neoplasms Accuracy

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