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American control Conference

作者： Mert Bastug Mihaly Petreczky Rafael Wisniewski John Leth Department of Electronic Systems Automation and Control Aalborg University 9220 Aalborg Denmark Department of Computer Science and Automatic Control (UR Informatique et Automatique) Ecole des Mines de Douai 59508 Douai France

A moment-matching method for the model reduction of linear switched systems (LSSs) is developed. The method is based upon a partial realization theory of LSSs and it is similar to the Krylov subspace methods used for ... 详细信息

ISBN: (纸本)9781479932757

关键词： Reduced order systems Markov processes Switched systems Switches Approximation methods Approximation algorithms Computational modeling

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Model Reduction of Linear Switched Systems by Restricting Discrete Dynamics

Model Reduction of Linear Switched Systems by Restricting Di...

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IEEE Annual Conference on Decision and control

ISBN: (纸本)9781467360890

We present a procedure for reducing the number of continuous states of discrete-time linear switched systems, such that the reduced system has the same behavior as the original system for a subset of switching sequences. The proposed method is expected to be useful for abstraction based control synthesis methods for hybrid systems.

关键词： Reduced order model Switched systems hybrid systems Abstraction Switching sequences Subset Linear

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Semi-global leader-following consensus of multiple linear systems with position and rate-limited actuators: The state feedback case

Semi-global leader-following consensus of multiple linear sy...

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World Congress on Intelligent control and automation (WCICA)

作者： Zhiyun Zhao Zongli Lin Department of Automation Key Laboratory of System Control and Information Processing Shanghai China Charles L. Brown Department of Electrical and Computer Engineering University of Virginia Charlottesville VA USA

This paper studies the semi-global leader-following consensus problem for a group of linear systems in the presence of both actuator position and rate saturation. Each follower agent in the group is described by a general linear system subject to simultaneous actuator position and rate saturation. We construct a low gain based linear state feedback control law for each follower agent and show that semi-global leader-following consensus can be achieved by using these control laws when the communication topology among follower agents is a connected undirected graph and the leader is a neighbor of at least one follower. Simulation results illustrate the theoretical results.

关键词： Actuators State feedback Topology Linear systems Multi-agent systems Closed loop systems Vectors

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Longitudinal control of vehicle platoons for stop-and-go waves mitigation

Longitudinal control of vehicle platoons for stop-and-go wav...

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

作者： Constantin F. Caruntu Cosmin Copot Corneliu Lazar Robin De Keyser Faculty of Automatic Control and Computer Engineering Gheorghe Asachi Technical University of Iasi Iasi Romania Department of Electrical energy Systems and Automation Ghent University Ghent Belgium

The increased traffic flow on both existing highways and city roads leads to the appearance of stop-and-go waves which have many disadvantages, e.g., increased risk of accidents, higher fuel consumption, increased pollution, increased wear of vehicle mechanical parts, driving stress and passenger discomfort. The platooning of vehicles could be the solution to this problem by enforcing them to follow each other and to maintain a safe distance between them. The advantages brought by this solution depend on ensuring the string stability of the vehicle platoon. In this paper the leader-follower system is employed to illustrate the stop-and-go waves mitigation. Several controllers (P, PI) were designed based on the conditions that have to be met in order to ensure the string stability of the vehicle platoon and comparisons were made with a controller based on the driver behavior.

关键词： Vehicles Mobile robots Accidents Stability criteria Transfer functions

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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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An Adaptive Predictive control Strategy for RMPPT under Partially Shaded Conditions

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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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Robust control reconfiguration of resource allocation systems with Petri nets and integer programming

Robust control reconfiguration of resource allocation system...

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作者： Li, Jun Zhou, Mengchu Guo, Tao Gan, Yahui Dai, Xianzhong Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of Education China School of Automation Southeast University Nanjing 210096 China Key Laboratory of Embedded System and Service Computing Ministry of Education Tongji University Shanghai 201804 China Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ 07102 United States

Supervisory control reconfiguration can handle the uncertainties including resource failures and task changes in discrete event systems. It was not addressed to exploit the robustness of closed-loop systems to accommodate some uncertainties in the prior studies. Such exploitation can cost-efficiently achieve reconfigurability and flexibility for real systems. This paper presents a robust reconfiguration method based on Petri nets (PNs) and integer programming for supervisory control of resource allocation systems (RASs) subject to varying resource allocation relationships. An allocation relationship is seen as a control specification while the execution processes requiring resources as an uncontrolled plant. First, a robust reconfiguration mechanism is proposed. It includes updating the P-invariant-based supervisor and evolving the state of the closed-loop system. The latter adapts to the control specification changes by the self-regulation of the closed-loop system's state. Next, two novel integer programming models for control reconfiguration are proposed, called a reconfiguration model with acceptability and reconfiguration one with specification correction. Since both models integrate the firability condition of transitions, no additional efforts are required for the state reachability analysis. Finally, a hospital emergency service system is used as an example to illustrate them. © 2014 Elsevier Ltd. All rights reserved.

关键词： Integer programming

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Data-driven-based superheated steam temperature control of fossil fuel power generation units

Data-driven-based superheated steam temperature control of f...

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World Congress on Intelligent control and automation (WCICA)

作者： Huifang Guo Fang Fang Le Wei School of Control and Computer Engineering North China Electric Power University Beijing China Department of Automation North China Electric Power University Baoding Hebei Province China

In modern industry, data has become an indispensible resource for the whole process of production and business. For the optimization of the control performance, the data-driven PID controller is introduced in this paper. Based on the data-driven control law, the parameters of the PID controller will be renewed automatically by using the real and historical input/output data of the plant. And then, the control action can be update in real time. From the perspective of engineering applications, the data-driven PID controller is researched as the outer loop controller in the superheated steam temperature cascade control system of fossil fuel power generation units. The simulation results show that the data-driven PID controller is suitable for the superheated steam temperature control, and its performance is better than that of the neural network PID controller.

关键词： PD control Temperature control Vectors Neural networks Databases Temperature

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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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Modeling and analysis of inertia aerodynamic effect of titan aerobot

Modeling and analysis of inertia aerodynamic effect of titan...

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AIAA SPACE 2014 Conference and Exposition

作者： Li, Zhibin Fan, Chunshi Li, Minghang Lin, Xianwu Wu, Lei Wang, He Jiang, Jianer Science and Technology on Space Intelligent Control Laboratory BICE Beijing 100190 China Qian Xuesen Laboratory of Space Technology China Academy of Space Technology 100194 China School of Electrical and Computer Engineering Purdue University IN 47907 United States Department of Automation Xiamen University Fujian 361005 China Science and Technology on Space Intelligent Control Laboratory BICE Beijing China Suzhou Fangzhou Aeromodelling Co. Ltd. Suzhou 215156 China

ISBN: (纸本)9781624102578

Research is done from the point of flight mechanics on Titan Aerobot. Consdering there are some errors in exstiong literatures on atmospheric temperature and density models for Titan, atmospheric environment model was built by polynomial fitting including temperature, density, pressure, viscosity and wind field models. The kinetic model of the airship was derived considering dynamic buoyancy effect, wind field disturbance and time varying mass characteristics. Also, repetitive calculation of Munk moment was avoided. Finally, after determining mass, inertia matrix, added mass tensor and apparent inertia tensor of LRC Titan Aerobot, the dynamic process is simulated by Matlab. Results shows that inertia aerodynamic force has significant influence on the airship motion and that repetitive calculation of Munk moment can produce wrong results.

关键词： Airships

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