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自动化学报 2015年第2期2卷 134-142页

作者： Xia Yuanqing the School of Automation Beijing Institute of Technology State Key Laboratory of Intelligent Control and Decision of Complex Systems Beijing 100081

The concept of cloud control systems is discussed in this paper, which is an extension of networked control systems (NCSs). With the development of internet of things (IOT), the technology of NCSs has played a key role in IOT. At the same time, cloud computing is developed rapidly, which provides a perfect platform for big data processing, controller design and performance assessment. The research on cloud control systems will give new contribution to the control theory and applications in the near future.

关键词： Cloud control systems (NCSs) networked control systems cloud computing cyber-physical systems (CPSs) big data

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Identification of FIR systems with Quantized Inputs and Observations

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IFAC-PapersOnLine 2015年第28期48卷 674-679页

作者： Guo, Jin Wang, Le Yi Yin, George Zhao, Yanlong Zhang, Ji-Feng School of Automation and Electrical Engineering University of Science and Technology Beijing Beijing100083 China Department of Electrical and Computer Engineering Wayne State University DetroitMI48202 United States Department of Mathematics Wayne State University DetroitMI48202 United States Key Laboratory of Systems and Control Institute of Systems Science Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing100190 China

This paper introduces identification algorithms for finite impulse response systems under quantized output observations and general quantized inputs. While asymptotically efficient algorithms for quantized identification under periodic inputs are available, their counterpart under general inputs has encountered technical difficulties and evaded satisfactory resolutions. Under quantized inputs, this paper resolves this issue with constructive solutions. A two-step algorithm is developed, which demonstrates desired convergence properties including strong convergence, mean-square convergence, convergence rates, asymptotic normality, and asymptotical efficiency in terms of the Cramér-Rao lower bound. Some essential conditions on input excitation are derived that ensure identifiability and convergence. It is shown that by a suitable selection of the algorithm's weighting matrix, the estimates become asymptotically efficient. The strong and mean-square convergence rates are explicitly obtained. Optimal input design is discussed. Numerical examples are included to illustrate the main results of this paper © 2015

关键词： FIR filters Efficiency Identification (control systems) Impulse response Asymptotic efficiency Asymptotically efficient Finite impulse response system Identification algorithms Input design Mean square convergences non periodic input quantization

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Analysis and control of Doubly Fed Induction Generator for Zero Voltage Ride Through

Analysis and Control of Doubly Fed Induction Generator for Z...

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International Conference on Electrical Machines and systems

作者： Haiyan Tang Yuanzhu Chang Yongning Chi Bo Wang Yan Li Jiabing Hu State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute. Beijing 100192 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781467388634

The stator transient DC flux component emerges in the Double Fed Induction Generator (DFIG) following grid voltage dip, which results in an important influence on the controllability of rotor converter. In this paper, the research focuses on the responding time of the dynamic reactive current injection referring to DFIG with the crowbar protection under Zero Voltage Ride-Through (ZVRT). Firstly, theoretical analysis about the shortest quitting time of crowbar is carried out. Then, combined with crowbar protection and demagnetization control, ZVRT of DFIG is achieved as well as the fast injection of dynamic reactive current. Finally, the simulation results are presented to verify the theoretical analysis and the proposed control strategy. It is helpful to enhance fault ride through capability of DFIG.

关键词： Crowbar DFIG Dynamic reactive current injection ZVRT

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An Improved Isomap Algorithm Based on LP-Centers

An Improved Isomap Algorithm Based on LP-Centers

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2015 International Conference on Artificial Intelligence and industrial Engineering(AIIE 2015)

作者： W.W.Chen W.J.Mao State Key Laboratory of Industrial Control Technology Institute of Cyber-Systems and Control Zhejiang University

ISBN: (纸本)9781510806450

The isometric feature mapping(Isomap) is one of the widely used low-dimensional embedding methods. However, Isomap has three bottlenecks: sensitivity to outliers, high computational complexity and topological instability caused by short-circuit edges. To address above problems, by introducing the concepts of linear patch(LP) and k-nearest center(k-NC), a LP-center based Isomap(LPC-Isomap) approach is proposed in this paper. Firstly, before constructing a neighborhood graph, outliers are eliminated by LPC-Isomap. Then LP-centers are selected reasonably as landmark points by LPC-Isomap to reduce computational complexity. We compute the intersections between k-NC of each pair of points. If an intersection is empty, the edge connecting the corresponding pair of points is considered as a short-circuit edge. Lastly, the useful behavior of LPC-Isomap is verified through numerical examples with several data sets.

关键词： Isomap linear patch(LP) k-nearest center(k-NC) LPC-Isomap

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Coordinated Transportation of a Group of Unmanned Ground Vehicles

Coordinated Transportation of a Group of Unmanned Ground Veh...

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第三十四届中国控制会议

作者： Yunpeng Wang Long Cheng Zeng-Guang Hou Min Tan Hongnian Yu State Key Laboratory of Management and Control for Complex Systems Institute of Automation Chinese Academy of Sciences State Key Laboratory of Intelligent Control and Decision of Complex Systems Beijing Institute of Technology Faculty of Science and Technology Bournemouth University

ISBN: (纸本)9781467374439

This paper studies a coordinated transportation problem of a group of unmanned ground vehicles(UGVs). These ground vehicles belong to two categories: master vehicles and slave vehicles. A two-step strategy is proposed to solve this problem. First, let the master vehicles move along ideal trajectories. Then, let the slave vehicles move into the area surrounded by master vehicles and move together with them. By the two-step strategy, the coordinated transportation problem is divided into a tracking problem and a containment problem. A P In-type tracking protocol and a P In-type containment protocol(P and I stand for Proportion and Integration, respectively;Inimplies that the protocol includes high-order integral terms) are proposed to solve these two problems. It is proved that the coordinated transportation problem can be solved by two proposed protocols with proper parameters if for each follower there exists at least one leader which has a directed path to this follower. Finally, a simulation example is presented to demonstrate the effectiveness of the proposed algorithms.

关键词： Coordinated transportation,Polynomial trajectory,Containment control,Multi-agent system.

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Reach almost sure consensus with only group information

Reach almost sure consensus with only group information

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作者： Lin, Zhiyun Hou, Jian Yan, Gangfeng Yu, Changbin State Key Laboratory of Industrial Control Technology College of Electrical Engineering Zhejiang University 38 Zheda Road Hangzhou310027 China School of Electrical Engineering and Computer Science University of Newcastle CallaghanNSW2308 Australia Beijing Aerospace Automatic Control Institute Beijing100854 China National Key Laboratory of Science and Technology on Aerospace Intelligence Control Beijing100854 China Research School of Engineering Australian National University CanberraACT2600 Australia

This brief presents a new distributed scheme to solve the consensus problem for a group of agents if neither their absolute states nor inter-agent relative states are available. The new scheme considers a random partition of agents into two subgroups at each step and then uses the relative group representative state as feedback information for the consensus purpose. It is then shown that almost sure consensus can be achieved under the proposed scheme in both discrete time and continuous time. For the discrete time case, almost sure consensus is achieved if and only if the weighting parameter for state update is greater than one. For the continuous time case, almost sure consensus is realized when the weighting parameter is positive. Moreover, it is shown that if a uniform probability is considered for group selection, then the group of agents can reach average consensus in mean. © 2014 Elsevier. Ltd All rights reserved.

关键词： Multi agent systems

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Nonlinear Process Monitoring Based on Robust Auto-Encoder Model

Nonlinear Process Monitoring Based on Robust Auto-Encoder Mo...

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第26届中国过程控制会议（CPCC2015）

作者： Li Jiang Zhihuan Song Junghui Chen State Key Laboratory of Industrial Control Technology Institute of Industrial Process Control Department of Control Science and Engineering Zhejiang University Department of Chemical Engineering Chung-Yuan Christian University

Previous work on process monitoring has shown that process nonlinearity can be overcome by neural networks(NN) model. But it's difficult to train a NN model that has good generalization capabilities in process monitoirng. In this paper, a NN model called Auto-Encoder(AE) is introdued to model the process behavior, then a robust training method is proposed based on the idea of making the learned model robust to the noisy training *** analysis shows that the proposed Robust Auto-Encoder(RAE) is equal to a regularized AE which can capture nonlinear variations in the training data. Based on this, a corresponding statistic is introduced for *** case studies are provided for performance evaluation of the proposed method.

关键词： Process Monitoring Fault Detection Robust Auto-Encoder

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Supply chain uncertainty under ARIMA demand process

Supply chain uncertainty under ARIMA demand process

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11th International Conference on Business Process Management, BPM 2013

作者： Pan, Mi Wu, Weimin The State Key Laboratory of Industrial Control Technology Institute of Cyber-systems and Control Zhejiang University Hangzhou China

ISBN: (纸本)9783319062563

This paper discusses a typical supply chain system based on Auto- Regressive Integrated Moving Average (ARIMA) demand process. Minimum Mean Square Error principle and stochastic optimal control theory are introduced to build a new framework for supply chain uncertainty study under general ARIMA demand process. After formulating the order and inventory quantity at time period t, this paper analyzes the optimal order policy as to decrease the bullwhip effect and stock fluctuations under non-stationary demand. The theoretical analysis reveals that a reasonable order quantity can reduce the bullwhip effect generated by demand uncertainty. We also show the negative correlation between the bullwhip effect and inventory stability in the discussed supply chain model. © Springer International Publishing Switzerland 2014.

关键词： Mean square error

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Analysis of delay attacks based on game theory in time synchronization protocols

Analysis of delay attacks based on game theory in time synch...

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2013 International Conference on Communication technology, ICCT 2013

作者： Gao, Mengzhou Feng, Dongqin Chu, Jian Institute of Cyber-Systems and Control State Key Laboratory of Industrial Control Technology Zhejiang University Hangzhou China

ISBN: (纸本)9781845648633

Time synchronization protocols are widely used in industrial control systems. As the development of network technology, various types of attacks have occurred. Among them, delay attacks are less studied. In this paper, we described an effective way for delay attacks which were achieved by a Man-In-The-Middle attack of asymmetric delays. To find inherent relationships between attackers and defenders, we proposed a two-person noncooperative game theoretic model. Based on Expected Utility Maximization, the mixed-strategy Nash equilibrium (NE) was resolved. The expression of probability distribution under NE indicates potential relationships between mixed-strategy probability distributions, attack costs, defence costs, and provides evidence for security and risk management professionals. © 2014 WIT Press.

关键词： Game theory

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A Petri net approach for green supply Chain network modeling and performance analysis

A Petri net approach for green supply Chain network modeling...

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11th International Conference on Business Process Management, BPM 2013

作者： Pan, Mi Wu, Weimin The State Key Laboratory of Industrial Control Technology Institute of Cyber-systems and Control Zhejiang University Hangzhou China

ISBN: (纸本)9783319062563

Green supply chain has become a promising and challenging field during the last decade driven by rising environmental conscious business and governmental legislation. In this paper, we develop a Petri-net based model to describe the green supply chain and to evaluate the essential performance. Generalized stochastic Petri nets (GSPN) are introduced to model the network of a general green supply chain with time characteristics. Performance analysis is carried out using the embedded Markov chain. Furthermore, we perform a comparison between green and normal supply chain to assert the superiority of the green supply chain in terms of profits. © Springer International Publishing Switzerland 2014.

关键词： Petri nets

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