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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Christoforos Economakos Maria Tzamtzi George Economakos Department of Automation Engineering Technological Educational Institution of Sterea Ellada Greece National Technical University of Athens School of Electrical and Computer Engineering Microprocessors and Digital Systems Laboratory Athens Greece

Recent advances in embedded automation applications require quality of results in terms of speed and computational complexity, along with strict time-to-market schedules. To cope with these demands, the design industry is searching for novel approaches. Performance is sought by utilizing modern FPGA devices, offering hundreds of GFLOPs with maximum power efficiency. Productivity is enforced with modern design methodologies like High-Level Synthesis and Electronic System Level design, that offer an efficient abstraction level to boost-up early prototyping. This paper presents a scalable architecture and a corresponding design methodology for the design of digital controllers, as a reference for modern control applications. The advantages of the proposed methodology are: (a) improved performance through hardware acceleration of demanding application cores, (b) improved quality of results with floating point calculations, (c) flexibility and integration of common peripheral devices supported by a RISC microcontroller, (d) low-overhead scalability from single core to multi core architectures and (e) improved designer productivity by working with C level design descriptions only. Experimental results show that the proposed System-on-Chip architecture is an efficient rapid prototyping platform for digital control applications, with very promising future extension capabilities.

关键词： Hardware computer architecture Field programmable gate arrays Software Microcontrollers Digital signal processing Performance evaluation

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Evolution and maintenance of cooperation via inheritance of neighborhood relationship

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Chinese Science Bulletin 2013年第28期58卷 3491-3498页

作者： TAN ShaoLin Lü JinHu YU XingHuo HILL David John The Key Laboratory of System and Control Institute of Systems ScienceAcademy of Mathematics and Systems ScienceChinese Academy of Sciences School of Electrical and Computer Engineering RMIT University Department of Electrical and Electronic Engineering The University of Hong Kong School of Electrical and Information Engineering University of Sydney

Cooperative behaviors are ubiquitous in nature and human *** is very important to understand the internal mechanism of emergence and maintenance of *** we know now,the offsprings inherit not only the phenotype but also the neighborhood relationship of their *** recent research results show that the interactions among individuals facilitate survival of cooperation through network reciprocity of clustering *** paper aims at introducing an inheritance mechanism of neighborhood relationship to explore the evolution of *** detail,a mathematical model is proposed to characterize the evolutionary process with the above inheritance *** analysis and numerical simulations indicate that high-level cooperation can emerge and be maintained for a wide variety of cost-to-benefit ratios,even if mutation happens during the evolving process.

关键词：合作机制邻里关系维护演变进化过程人类社会遗传机制数学模型

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Real-time Pricing Leading to Optimal Operation under Distributed Decision Makings

Real-time Pricing Leading to Optimal Operation under Distrib...

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American control Conference

作者： Kenji Hirata Joao P. Hespanha Kenko Uchida Department of Mechanical Engineering Nagaoka University of Technology Nagaoka 940 2188 Japan Center for Control Dynamical Systems and Computation and the Department of Electrical and Computer Engineering University of California Santa Barbara CA 93106 USA Department of Electrical Engineering and Bioscience Waseda University Tokyo 169 8555 Japan

ISBN: (纸本)9781479932757

This paper investigates the optimal regulation problem with the steady-state constraints under distributed decision makings, where each agent is allowed to determine its own optimal set-point according to an individual profit. On the other hand, the utility, which corresponds to an individual public commission, tries to realize a socially optimal solution that fulfills steady-state constraints. In order to align the individual decision making of each agent with the socially optimal solution, the utility is allowed to provide additional price, which corresponds to tax or subsidy for the agent. This paper proposes a real-time pricing strategy of the utility. The proposed pricing strategy is heuristic, but we show that the resulting closed-loop system is stable, if the step size parameter in the real-time pricing strategy is sufficiently small, and realizes tracking to the socially optimal solution.

关键词： Pricing Optimization Closed loop systems Real-time systems Steady-state Stability analysis Distributed decision making

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Semi-Global Output Consensus of Linear Agents with External Disturbances and Actuator Saturation:An Output Regulation Approach

Semi-Global Output Consensus of Linear Agents with External ...

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第三十三届中国控制会议

作者： Zhiyun Zhao Yiguang Hong Zongli Lin Department of Automation and Key Laboratory of System Control and Information Processing of the Ministry of EducationShanghai Jiao Tong University Key Laboratory of Systems and Control Academy of Mathematics and Systems ScienceChinese Academy of Sciences Charles L. Brown Department of Electrical and Computer Engineering University of VirginiaP.O. Box 400743Charlottesville VA 22904-4743 U.S.A.

This paper studies semi-global leader-following output consensus of a multi-agent system. Each follower agent in the system, described by a general linear system subject to external disturbances and actuator saturation, is to track the leader agent. Conditions on the agent dynamics are identified under which a low gain feedback based linear state control algorithm is constructed for each follower agent such that the leader-following output consensus is achieved when the communication topology among the agents is a directed graph that contains no loop and the leader is globally reachable. In addition, discussions and simulations are also provided for the output consensus in the presence of actuator saturation.

关键词： Leader-following output consensus,low gain feedback,multi-agent systems,actuator saturation

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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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Impact of inertia control of DFIG wind turbines on system small-signal stability

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Dianli Xitong Zidonghua/Automation of Electric Power systems 2014年第23期38卷 6-12页

作者： Chen, Runze Wu, Wenchuan Sun, Hongbin Lan, Haibo Liu, Haitao Liu, Xiaomin Department of Electrical Engineering Tsinghua University Beijing100084 China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments Tsinghua University Beijing100084 China State Grid Jibei Electric Power Company Limited Beijing100053 China

The impact of inertia control of doubly-fed induction generator (DFIG) wind turbines on the small-signal stability of systems is studied. Firstly, the principle of DFIG wind turbines offering inertia responses is discussed, followed by the introduction of two approaches of inertia control. Then, possible influences of two control schemes on system small-signal stability are analyzed. Finally, on the basis of simulation, the modal analysis method is adopted to analyze the influence characteristics of different control strategies and various control parameters on system small-signal stability. Analysis results show that inertia control may have an appreciable impact on the system small-signal stability. Therefore, security constraints of small-signal stability should be carefully considered when designing the control strategy and parameters. ©, 2014 State Grid Electric Power Research Institute Press.

关键词： Wind turbines

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Synchronization of nonlinear circuits in dynamic electrical networks

Synchronization of nonlinear circuits in dynamic electrical ...

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European control Conference (ECC)

作者： Florian Dörfler Sairaj V. Dhople Brian B. Johnson Abdullah Hamadeh Department of Electrical Engineering University of California at Los Angeles Los Angeles CA Department of Electrical and Computer Engineering University of Minnesota Minneapolis MN Power Systems Engineering Center at the National Renewable Energy Laboratory Golden CO Department of Mechanical Engineering Massachusetts Institute of Technology Cambridge MA

Synchronization of coupled oscillators is a pervasive theme of multi-disciplinary research. Focused on circuit-theoretic applications, in this paper, we derive sufficient conditions for global asymptotic synchronization in a system of identical nonlinear circuits coupled through linear time-invariant (LTI) electrical networks. The nonlinear circuits are composed of a parallel combination of passive LTI circuit elements and a nonlinear voltage-dependent current source with finite gain. The terminals of the nonlinear circuits are coupled through LTI networks characterized by either identical per-unit-length impedances or identical effective impedances between any two terminals. This setup is motivated by a recently proposed control strategy for inverters in microgrids. We analyze synchronization by means of an input-output analysis of a coordinate-transformed system that emphasizes signal differences. To apply the synchronization analysis to a broad class of networks, we leverage recent results on Kron reduction-a circuit reduction and transformation procedure that reveals the interactions of the nonlinear circuits. We illustrate our results with simulations in networks of coupled Chua's circuits.

关键词： Synchronization Nonlinear circuits Admittance Integrated circuit modeling Impedance Vectors Oscillators

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Fast Convergence of Quantized Consensus Using Metropolis Chains

Fast Convergence of Quantized Consensus Using Metropolis Cha...

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IEEE Annual Conference on Decision and control

作者： Tamer Basar Seyed Rasoul Etesami Alex Olshevsky Coordinated Science Laboratory Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign Urbana IL 61801 Department of Industrial and Enterprise Systems Engineering University of Illinois at Urbana-Champaign Urbana IL 61801

ISBN: (纸本)9781467360890

We consider the quantized consensus problem on undirected connected graphs and study its expected convergence time to the set of consensus points. As compared with earlier results on the problem, we improve the convergence speed of the dynamics by a factor of n, where n is the number of agents involved in the dynamics. In particular, we show that when the edges of the network are activated based on a Poisson processes with Metropolis rates, the expected convergence time to the consensus set is at most O(n~2 log n). This upper bound is better than all available results for randomized quantized consensus.

关键词： metropolis Poisson process Converge edge network dynamics

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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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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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