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第35届中国控制会议

作者： Wentao Zhang Zhiqiang Zuo Yijing Wang Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and AutomationTianjin University

ISBN: (纸本)9781509009107

In this paper,the distributed consensus problem for double integrator multi-agent systems is addressed in the light of a novel cooperative law,which relaxes the requirement on the velocity measurements of the agents.A necessary and sufficient condition is derived based on the proposed coordination law under the general directed communication topology via a real-time implementation *** order to save communication burden,we further explicitly explore the cooperation condition where the execution mechanism is event-based and the graph is ***,two examples are depicted to show the feasibility of the designed consensus protocol.

关键词： Double Integrator Multi-agent Systems Consensus Distributed Cooperative Rule Event-triggered control

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Average formation tracking for second-order multi-agent systems with multiple leaders

Average formation tracking for second-order multi-agent syst...

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第28届中国控制与决策会议

作者： Xiwang Dong Liang Han Qingdong Li Zhang Ren School of Automation Science and Electrical Engineering Science and Technology on Aircraft Control LaboratoryBeihang University

ISBN: (纸本)9781467397155

Average formation tracking problems for second-order multi-agent systems with multiple leaders and directed interaction topologies are studied,where the states of followers form a predefined time-varying formation while tracking the average state of the multiple *** average formation tracking protocol is constructed using neighboring relative information,where only part of the followers which are named as well-informed ones are required to obtain the information of the multiple *** properties of the Laplacian matrix are derived under the assumption that for each uninformed follower,there exists at least one directed path from a well-informed follower to *** and sufficient conditions for second-order multi-agent systems with multiple leaders to achieve average formation tracking are proposed by utilizing the properties of the Laplacian *** approach to design the average formation tracking protocol is presented by solving an algebraic Riccati *** presented results can be applied to deal with the target enclosing problems,average tracking problems and consensus tracking problems for second-order multi-agent systems with one or multiple targets/*** application example in multiple vehicles enclosing is provided to demonstrate the effectiveness of the theoretical results.

关键词： Time-varying formation control Average formation tracking Multiple targets enclosing Multi-agent system

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Modeling DC circuit breaker in MTDC for wind farms based on delay slope method

Modeling DC circuit breaker in MTDC for wind farms based on ...

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Annual Conference of Industrial Electronics Society

作者： Xunwen Su Songtao Fu Jiaoxia Hao Xiaomeng Kang Zeping Yu Rongfeng Yang School of Electrical and Control Engineering Heilongjiang University of Science and Technology Harbin China School of Electrical Engineering and Automation Harbin Institute of Technology Harbin China

In a multi-terminal high-voltage direct current based on voltage source converter, the proactive hybrid HVDC breaker is an important component in DC grids to isolate a DC fault. From the DC breaker design point, it is crucial to realize a fast fault current breaking. Hybrid HVDC breaker based on delay slope method for breaking signal has more fast action. Especially for overhead lines of DC grid, automatic reclosing control method is adopted in this paper. A wind farm ring topology model, 8-terminal HDC based on voltage source converter, is build on PSCAD/EMTDC simulation platform. Simulations are given to demonstrate effectiveness of the delay slope method and automatic reclosing control strategies. In last, it is pointed out the existing problems in automatic reclosing of Hybrid HVDC breaker.

关键词： HVDC transmission Circuit faults Delays Wind farms Circuit breakers Voltage measurement Topology

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Analytical method for design and thermal evaluation of a long-term flywheel energy storage system

Analytical method for design and thermal evaluation of a lon...

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International Symposium on Power Electronics, electrical Drives, automation and Motion, SPEEDAM

作者： Maksim A. Sokolov Rafal P. Jastrzebski Seppo E. Saarakkala Marko Hinkkanen Arkadiusz Mystkowski Juha Pyrhönen Olli Pyrhönen Department of Electrical Engineering and Automation Aalto University Department of Electrical Engineering Lappeenranta University of Technology Department of Automatic Control and Robotics Bialystok University of Technology

This paper presents a novel analytical method for electro-mechanical design of a high speed long-term flywheel energy storage system and thermal evaluation of possible operating modes of the system. Flywheel's composite shell rotor along with the motor/generator unit are assumed to be placed into a sealed vacuum chamber, which presents a challenge of heat transfer, produced by rotor losses. Developed method takes into account thermal radiation properties of the rotor and is realised using Mathcad software, which allows for quick investigation of any flywheel configuration. The method involves calculations for preliminary rotor sizing and determining achievable operation modes, while keeping the rotor under a specified temperature limit. Results of using this method for studying dependencies of thermal performance on initial system parameters are presented and conclusions are drawn. Based on the conducted study, recommendations on system design considerations are given.

关键词： Rotors Energy storage Temperature Mathematical model Design methodology Heating Thermal analysis

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Formation-containment control for Mutli-agent Systems with Second-order Dynamics and Time-varying Delays

Formation-containment Control for Mutli-agent Systems with S...

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第28届中国控制与决策会议

作者： Liang Han Xiwang Dong Qingdong Li Zhang Ren School of Automation Science and Electrical Engineering Science and Technology on Aircraft Control LaboratoryBeihang University

In this paper,formation-containment control problems for multi-agent systems（MASs） with second-order dynamics and time-varying delays are *** position and speed of leaders are designed to achieve the timevarying formation and the position and speed of followers are required to enter the convex envelope spanned by those of the leaders simultaneously,which differs from conventional formation control or containment control *** the neighboring positions and velocities,a formation-containment protocol with time-varying delays is *** exploiting the space decomposition approach,formation-containment problems are reduced to asymptotically stable *** conditions for second-order MASs with time-varying delays to realize formation-containment are *** simulations are shown to demonstrate the feasibility of the theoretical results.

关键词： Formation-containment control second-order dynamics multi-agent systems time-varying delays

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Repeated Strike Process During Disconnector Operation in Ultra-High Voltage Gas-Insulated Switchgear

Repeated Strike Process During Disconnector Operation in Ult...

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作者： Guan, Yonggang Cai, Yuanji Chen, Weijiang Liu, Weidong Li, Zhibing Yue, Gongchang Zhang, Junmin State Key Lab of Control and Simulation of Power System and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing100084 China State Grid Corporation of China Beijing100031 China China Electric Power Research Institute Beijing100192 China School of Automation Science and Electrical Engineering Beihang University Beijing100191 China

Very fast transient over-voltage (VFTO), induced by disconnector operations in gas-insulated switchgears, has become the limiting dielectric stress at ultra-high voltage levels. Much work has been done to investigate single-strike waveforms of VFTO. However, little study has been carried out investigating the repeated strike process, which would influence VFTO significantly. In this paper, we carried out 450 effective experiments in an ultra-high voltage test circuit, and conducted calculations through the Monte Carlo simulation method, to investigate the repeated strike process. Firstly, the mechanism of the repeated strike process is proposed, based on the experimental results. Afterwards, statistical breakdown characteristics of disconnectors are obtained and analyzed. Finally, simulations of the repeated strike process are conducted, which indicate that the dielectric strength recovery speed and polarity effect factor have a joint effect on VFTO. This study enhances the understanding of the nature of VFTO, and may help to optimize the disconnector designed to minimize VFTO.

关键词： Monte Carlo methods

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Wayside acoustic fault diagnosis of railway wheel-bearing paved with Doppler Effect reduction and EEMD-based diagnosis information enhancement

Wayside acoustic fault diagnosis of railway wheel-bearing pa...

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International Conference on Sensing Technology, ICST

作者： Yongbin Liu Qiang Qian Yangyang Fu Fang Liu Siliang Lu National Engineering Laboratory of Energy-Saving Motor & Control Technology Hefei China School of Electrical Engineering and Automation Anhui University

ISBN: (纸本)9781509007974

Wayside acoustic monitoring technique is promising for health monitoring of wheel-bearing for railway vehicles. However, due to the high relative moving speed between the railway vehicle and the wayside mounted microphones, the recorded signal is embedded with Doppler Effect. What's more, the background noise is relatively heavy which makes it difficult to extract the diagnosis relevant information. To solve these problems, this paper introduced a railway wheel-bearing wayside acoustic fault diagnosis scheme based on Doppler Effect reduction and Ensemble Empirical Mode Decomposition (EEMD). Firstly, an improved Doppler Effect reduction method is introduced incorporating with the kinematic parameters estimation and signal re-sampling method. Secondly, the EEMD is employed to extract the diagnosis relevant Intrinsic Mode Function (IMF). Finally, the envelope spectrum analysis is employed to identify the local fault. The effectiveness of the proposed method is verified by experimental cases analysis.

关键词： Doppler effect Kinematics Time-frequency analysis Acoustics Parameter estimation Fault diagnosis Monitoring

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Design of LQR controller with Big Bang-Big Crunch Optimization Algorithm Based on Time Domain Criteria

Design of LQR Controller with Big Bang-Big Crunch Optimizati...

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Mediterranean Conference on control and automation

作者： Moayed Almobaied Ibrahim Eksin Mujde Guzelkaya Faculty of Electrical and Electronics Engineering Control and Automation Department Istanbul Technical University Maslak TR-34469 Istanbul Turkey Electrical and Electronics Engineering Control and Automation Department Istanbul Technical University Maslak TR-34469 Istanbul Turkey

ISBN: (纸本)9781467383479

LQR controller is the most popular technique that provides an optimal control law for linear systems among the state space feedback control strategies. However, the conventional LQR controller synthesis is unfortunately an iterative process due to the trial and error approach involved in determining the parameters values of the weighing matrices Q and R. Here, the Big Bang-Big Crunch (BB-BC) optimization algorithm is used that optimizes a time domain fitness function in the design of the state feedback optimal control law and thus avoiding the repeated adjustment process of LQR parameters. In this study, a special performance fitness function that is inversely proportional to the certain time domain step response criteria of a dynamical system is proposed for the optimization procedure. In order to test the performance of the proposed method, firstly a simulation study is done within the MATLAB to stabilize an inverted pendulum on cart. Then, the proposed controller is used in a real time implementation to stabilize a DC-DC boost converter benchmark in the lab. Both MAT-LAB simulations and laboratory experiments demonstrate the effectiveness of the proposed controller.

关键词： Optimization Mathematical model Optimal control Process control Symmetric matrices Time-domain analysis

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Visual Tracking via Ergodic Markov Chain and Depth Fusion

Visual Tracking via Ergodic Markov Chain and Depth Fusion

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第28届中国控制与决策会议

作者： Wei Liu Xiaoli Li School of Automation and Electrical Engineering University of Science and Technology Beijing College of Electronic Information and Control Engineering Beijing University of Technology

ISBN: (纸本)9781467397155

Visual tracking is a significant and challenging task in computer *** this paper,we consider visual tracking as random walks on ergodic Markov chain,where nodes are represented as superpixels and edges represent their *** graph model and Markov theory are integrated to construct ergodic Markov *** on the random walks and introduction of positive and negative template nodes,our algorithm can search candidate nodes belonging to the target globally and suppress nodes belonging to the *** we obtain a confidence map that locates target *** particular,to describe patchs more accurately,we fuse the depth information into the representation of ***,we construct another ergodic Markov chain on depth map to handle occlusion to make our algorithm more *** results demonstrate that our algorithm achieves excellent performance,even though in handing occlusion,non-rigid deformation,scale variation,etc.

关键词： Visual tracking Ergodic Markov chain Depth map Confidence map

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Dynamic surface control and active disturbance rejection control-based integrated guidance and control design and simulation for hypersonic reentry missile

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International Journal of Modeling, Simulation, and Scientific Computing 2016年第3期7卷 216-242页

作者： Cong Zhang Yun-Jie Wu State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing 100191P.R.China School of Automation Science and Electrical Engineering Beihang University Beijing 100191P.R.China Science and Technology on Aircraft Control Laboratory Beihang University Beijing 100191P.R.China

This paper proposes a novel integrated guidance and control(IGC)method combining dynamic surface control(DSC)and active disturbance rejection control(ADRC)for the guidance and control system of hypersonic reentry missile(HRM)with bounded ***,the model of HRM is ***,the proposed IGC method based on DSC and ADRC is *** stability of closed-loop system is proved *** is worth mentioning that the ADRC technique is used to estimate and compensate the disturbance in the proposed IGC *** makes the closed-loop system a better performance and reduces the chattering caused by lumped ***,a series of simulations and comparisons with a 6-DOF non-linear missile that includes all aerodynamic effects are demonstrated to illustrate the effectiveness and advantage of the proposed IGC method.

关键词： Hypersonic reentry missile integrated guidance and control dynamic surface control active disturbance rejection control simulation

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