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International Journal of Control and automation 2014年第1期7卷 259-268页

作者： Dan, Zhao Yingjian, Kang Department of Electrical Technology College of Automation Engineering Beijing Polytechnic Beijing 100176 China Department of Computer Technology College of Telecommunications Engineering Beijing Polytechnic Beijing 100176 China

The application of industrial robots is an important symbol of a nation's industrial automation level. While domestic universities robot teaching is mostly on pint-sized robot. This paper introduces how combine the pint-sized robot teaching with the industrial robot practical operation. Through the pint-sized robot simulating industrial robot, realizing the manipulator operation, the student further to get more knowledge, learn the method to analyze and solve problems, and get effectively training and all-round development in innovation ability. © 2014 SERSC.

关键词： Machine design

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Global output feedback control for multiple robotic manipulators

Global output feedback control for multiple robotic manipula...

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IEEE Annual Conference on Decision and Control

作者： Qingkai Yang Hao Fang Jie Chen Zhongping Jiang Xiaodan Gu School of Automation Beijing Institute of Technology Beijing 100081 P. R. China Department of Electrical and Computer Engineering Polytechnic School of Engineering New York University Brooklyn NY 11201 USA

ISBN: (纸本)9781479978878

This paper investigates the global output feedback tracking control problem for multiple robotic manipulators. Firstly, the global nonsingular coordinate transformation to obtain a partially linear system is provided based on the solution of a set of partial differential equations. Then, a new class of velocity observers is designed to estimate the unmeasurable velocities for each system. By employing the estimators, we propose distributed control laws such that the UGAS (uniform global asymptotic stability) is achieved. The theoretical results are further validated by numerical simulations.

关键词： Output Feedback Control Manipulators Coordinate transformations

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Virtual inductance self-demagnetization based LVRT control strategy for doubly fed WTs

Virtual inductance self-demagnetization based LVRT control s...

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Annual IEEE Conference on Applied Power Electronics Conference and Exposition (APEC)

作者： Shuying Yang Yin Chen Liuchen Chang Zhen Xie Xing Zhang School of Electrical Engineering and Automation. Hefei University of Technology Hefei China Department of Electrical and Computer Engineering University of New Brunswick Fredericton NB Canada University of New Brunswick Fredericton NB CA

The distinctive driving scheme makes the stator windings of doubly fed induction generator (DFIG) be coupled with the power grid directly. When the grid fault occurs, dc component will appear in stator flux, ready to induce large electromotive force (EMF) in its rotor circuit. As a result, both the rotor circuit and the rotor-side converter (RSC) would suffer from over-currents and over-voltages without proper measures being taken. Although the crowbar is widely used to protect the driving converter and keep DFIG tied to grid, the flexibility of DFIG control system has not been exploited and it's hard to meet the ever stringent requirements of grid codes in the near future. Although, today some transient flux compensation based LVRT strategies have been reported for DFIG-based WTs, the strongly dependence on stator flux linkages makes this kind of algorithms a little complicated and dependent on DFIG parameters. Following the analysis of the transient electromagnetic characteristics of DFIG on grid fault, a novel LVRT control strategy based on virtual inductance self-demagnetization algorithm is proposed. With the novel strategy not only the rotor transient voltage surge is suppressed very well, beneficial to enlarging the controllable voltage dip range, but also the transient flux observation is removed completely, decreasing the computation complexity and the dependence on DFIG parameters, therefore, the rapidity and robustness of the control system is improved. The analysis and design in the paper is validated with the simulation and experiment results on 11kW test-rig for WTs.

关键词： Rotors Transient analysis Voltage control Inductance Stators Voltage fluctuations Demagnetization

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Feedback Stabilization of Networked Systems over Fading Channels with Resource Allocation

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IFAC-PapersOnLine 2015年第14期48卷 363-367页

作者： Qinyuan Liu Wei Chen Li Qiu Zidong Wang Department of Automation Tsinghua University Beijing P. R. China Department of Electronic and Computer Engineering Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong Department of Computer Science Brunel University London Uxbridge Middlesex UB8 3PH United Kingdom

In this paper, we consider the stabilization problems for networked control systems (NCSs) over parallel independent communication channels, wherein each channel is modeled as a general fading channel, i.e., a combination of multiplicative noise and additive noise. A channel capacity notion is introduced for such general fading channels to represent their capabilities of information transmission. A necessary and sufficient condition for closed-loop stabilization with stationary signal-to-noise ratio (SNR) constraints is established which builds a bridge between the channel capacities and the topological entropy of the open-loop plant. When the condition holds, a channel-controller co-design approach is proposed to accomplish the stabilization. Finally, a numerical example is presented to verify the effectiveness of our results.

关键词： Networked control systems feedback stabilization channel capacity resource allocation general fading channel

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STATE FEEDBACK STABILIZATION FOR A CLASS OF NONLINEAR TIME-DELAY SYSTEMS VIA DYNAMIC LINEAR CONTROLLERS

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Journal of Systems Science & Complexity 2014年第3期27卷 453-462页

作者： CHAI Lin QIAN Chunjiang School of Automation Southeast University Key Laboratory of Measurement and Control of Complex Systems of Engineering Southeast University Department of Electrical and Computer Engineering University of Texas at San AntonioSan AntonioTX 78249USA

The dynamic linear state feedback control problem is addressed for a class of nonlinear systems subject to ***,using the dynamic change of coordinates,the problem of global state feedback stabilization is solved for a class of time-delay systems under a type of nonhomogeneous growth *** the aid of an appropriate Lyapunov-Krasovskii functional and the adaptive strategy used in coordinates,the closed-loop system can be globally asymptotically stabilized by the dynamic linear state feedback *** growth condition in perturbations are more general than that in the existing *** correctness of the theoretical results are illustrated with an academic simulation example.

关键词： Dynamic linear controller global stabilization nonlinear time-delay systems state feed-back control.

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Model predictive control of quasi-Z source three-phase four-leg inverter

Model predictive control of quasi-Z source three-phase four-...

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Annual Conference of Industrial Electronics Society

作者： Sertac Bayhan Haitham Abu-Rub Department of Electrical and Computer Engineering Texas A&M University at Qatar Doha Qatar Department of Electronics and Automation Gazi University Ankara Turkey Qatar Environment and Energy Research Institute Doha Qatar

This paper presents a model predictive control (MPC) scheme for quasi-Z source (qZS) three-phase four-leg inverters. In order to cope with drawbacks of the traditional voltage source inverters (VSI)s, the qZS three-phase four-leg inverter topology is proposed in this study. To improve control capability of the controller, the MPC scheme is used. The proposed MPC is based mainly on the discrete-time model of the whole system. The proposed controller handles each phase current independently. As a result of this, the proposed qZS four-leg inverter has fault tolerant capability, for example if one leg fails the others can work normally. Simulation studies were performed to verify the steady-state and transient-state performances of the proposed control strategy under balanced/unbalanced reference currents and load conditions.

关键词： Inverters Topology Network topology Capacitors Mathematical model Predictive models Switches

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Relative Degrees and Output Tracking Control of T-S Fuzzy Systems 33

Relative Degrees and Output Tracking Control of T-S Fuzzy Sy...

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第三十三届中国控制会议

作者： ZHANG Yanjun TAO Gang CHEN Mou College of Automation Engineering Nanjing University of Aeronautics and Astronautics Department of Electrical and Computer Engineering University of VirginiaUSA

ISBN: (纸本)9781479947249

This paper presents a new study on the relative degrees of T-S fuzzy systems: ˙x(t) = N i=1μi(t)Aix(t) + N i=1μi(t)Biu(t),y(t) = N i=1μi(t)Cix(t),where(Ai,Bi,Ci) are some non-canonical form matrices,and proposes a feedback linearization based control design method for such *** study extends the system relative degree concepts,commonly used for control of complex nonlinear systems,to T-S fuzzy systems,and derives various relative degree conditions for general T-S fuzzy systems and establishes the relative degree dependent normal forms.A feedback linearization control design procedure is developed for such a system using its normal form,to achieve closed-loop stability and output tracking under relaxed design *** illustrative example is presented with simulation results to show the control system design procedure and desired performance.

关键词： Normal form,output tracking,relative degree,state feedback,T-S fuzzy systems

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qSDS: A QoS-Aware I/O scheduling framework towards software defined storage 15

qSDS: A QoS-Aware I/O scheduling framework towards software ...

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ACM/IEEE Symposium Architecture for Networking and Communications Systems, ANCS

作者： Jianzong Wang Lianglun Cheng Faculty of Computer Guangdong University of Technology Guangzhou P.R. China Department of Electronic and Computer Engineering University of Florida Gainesville Florida Faculty of Automation Guangdong University of Technology Guangzhou P.R. China

ISBN: (纸本)9781467366328

The inadequate resource allocation, lack of I/O performance prediction and insufficient isolation are affecting the storage performance in the multi-tenant cloud storage environment. In order to guarantee the Quality of Service (QoS), Softwaredefined Storage (SDS) is an effective approach in data centers. However, the lack of intelligence, robustness and selfadjustment are blocking the applications and promotions of SDS heavily. This paper focuses on the QoS-Aware I/O resource scheduling problem to build data centers with high availability, scalability and QoS. We will study workload characteristics, requirement analysis, the theory of QoS in SDS and I/O scheduling strategies. We obtain such goals by proposing a mathematics model of workload burstness, QoS semantic description with rule execution mechanisms and dynamic robust I/O scheduling algorithms for multi-type resources allocation. In the current progress, A QoS-Aware I/O Scheduling Framework towards SDS, qSDS has been proposed for the SSD/HDD hybrid storage. The preliminary evaluation in some benchmarks shows that qSDS can gain better performance compared with other strategies.

关键词： Quality of service Resource management Software Benchmark testing Robustness Throughput computers

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Hyperspectral image classification using Gradient Local Auto-Correlations

Hyperspectral image classification using Gradient Local Auto...

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Asian Conference on Pattern Recognition (ACPR)

作者： Chen Chen Junjun Jiang Baochang Zhang Wankou Yang Jianzhong Guo Department of Electrical Engineering University of Texas Dallas Texas USA School of Computer Science China University of Geosciences Wuhan China School of Automation Science and Electrical Engineering Beihang University Beijing China School of Automation Southeast University Nanjing China School of Electronic and Electrical Engineering Wuhan Textile University Wuhan China

ISBN: (纸本)9781479961016

Spatial information has been verified to be helpful in hyperspectral image classification. In this paper, a spatial feature extraction method utilizing spatial and orientational auto-correlations of image local gradients is presented for hyperspectral imagery (HSI) classification. The Gradient Local Auto-Correlations (GLAC) method employs second order statistics (i.e., auto-correlations) to capture richer information from images than the histogram-based methods (e.g., Histogram of Oriented Gradients) which use first order statistics (i.e., histograms). The experiments carried out on two hyperspectral images proved the effectiveness of the proposed method compared to the state-of-the-art spatial feature extraction methods for HSI classification.

关键词： Feature extraction Hyperspectral imaging Training Computational efficiency Testing Image classification

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Droop Control Based Stabilizing Method for V/f PWM Inverter Fed Induction Motor Drive System

Droop Control Based Stabilizing Method for V/f PWM Inverter ...

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IEEE Canadian Conference on Electrical and computer engineering

作者： Shuying Yang Pengpeng Cao Liuchen Chang Zhen Xie Xing Zhang Department of Electrical and Computer Engineering University of New Brunswick Fredericton NB Canada E3B 5A3 School of Electrical Engineering and Automation Hefei University of Technology Hefei China 230009

ISBN: (纸本)9781479958306

Sustained oscillations are often experienced when induction motor (IM) is fed with general-purpose PWM inverter operated in constant V/f mode, especially under light loaded and low frequency conditions. To stabilize the annoying oscillations and facilitate engineering practices of the simple control mode, an enhanced V/f control strategy is proposed following the analysis of the inherent mechanism of the phenomena. In the proposed control strategy, the frequency and amplitude of the output voltages of general-purpose inverter are dynamically dropped with respect to the oscillation components in the stator currents. To extract the right oscillation components, dual low pass filters with different cutoff frequencies are adopted to filter the active and reactive currents obtained by coordinate transformation on the sensed stator currents. The dynamic oscillation component out of the active current is used to drop the frequency and that out of the reactive current is used to drop the amplitude of the output voltages. By the proposed stabilizing method, the operating stability and drive system performances are improved as shown by small signal analysis, while the merits of parameter robustness and simplicity of V/f mode are still retained. The rationality of the analysis and the effectiveness of the proposed stabilizing method in this paper are demonstrated and validated by experiments.

关键词： Oscillators Stators Inverters Voltage control Pulse width modulation Rotors Stability analysis

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