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2nd International Workshop on Advanced Computational Intelligence, IWACI 2009

作者： Zhang, Jianhua Cai, Lei Wang, Hong University of Manchester PO Box 88 Manchester M60 1QD United Kingdom Beijing Key Laboratory Industrial Process Measurement and Control New Technology and System North China Electric Power University Beijing 102206 China

ISBN: (纸本)9783642031557

In this paper, a novel fault detection scheme is presented for networked control systems with random delays and noises. Since the random noises and delays existed in networked control system are probably non- Gaussian, the extended Luenberger observer under minimum error entropy frame is utilized to generate residual so as to detect faults in networked control systems. Finally, an illustrative example is given to demonstrate the effectiveness of the proposed method. © 2009 Springer-Verlag Berlin Heidelberg.

关键词： Networked control systems

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Evaluation of the effect of modal interaction higher than 2nd order in small-signal analysis

Evaluation of the effect of modal interaction higher than 2n...

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IEEE General Meeting Power& Energy Society

作者： Qi Huang Zhouqiang Wang Changhua Zhang Key Laboratory of Power System Wide-area Measurement and Control University of Electronic Science and Technology Chengdu Sichuan China

This paper attempts to obtain insight about the effect of modal interaction of higher than 2 nd order in small-signal analysis, through evaluating the effect of 3 rd order modal interaction. The indices that quantify the 3 rd order modal interaction are defined, following the modal analysis procedures used in linear modal analysis and second order modal analysis. Numerical simulation results demonstrates that, there are definitely modal interaction higher than 2 nd order, and with further higher order modal analysis, it is possible to detect more information about modal interaction, which might be useful in power system control.

关键词： Power system dynamics Power system modeling Power system analysis computing Power system control Modal analysis Power system stability Power systems Power system interconnection Nonlinear dynamical systems Numerical simulation

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Scene specified control for internet-based mobile robot operation

Scene specified control for internet-based mobile robot oper...

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IEEE International Conference on Mechatronics and Automation

作者： Xudong Ma Xianzhong Dai Fang Fang Ningting Cheng Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of Education School of Automation South East University Nanjing China

A networked mobile robot in large networks such as Internet often operates under supervisory control and the discrete commands and decisions from the remote operators normally depend on the feedback scene information. Therefore it must be tolerate of the significant and unpredicted time latency that might mislead the robot for time and scene-dependent operations. A series of strategies are presented in this paper to decrease the latency impact and implement scene specified control of a Internet-based mobile robot. Time stamps are attached to each communication packet of scene video, audio and environment information from the robot to remote operator's computer for display, which then sends back control decision or command of the right time stamps with the scene when needed. By allocating a memory buffer for current display and recent status even including video frames the robot recalls the environment with the event time stamps as searching index, which helps to estimate the exact robot position or operation. Reverse position and motion are conducted according to estimation from the memorized information. The strategies have been introduced to improve a practical networked mobile robot control platform with experiment validity given in detail.

关键词： Layout Internet Mobile robots Computer displays Delay Communication system control Auditory displays IP networks Supervisory control Feedback

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Finite-time tracking control of bank-to-turn missiles using terminalsliding mode

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ICIC Express Letters 2009年第4期3卷 1373-1380页

作者： Wang, Zhao Li, Shihua Fei, Shumin Key Laboratory of Measurement and Control of Complex Systems ofEngineering School of Automation Southeast University Nanjing 210096 China College of Information and Control Engineering China University of Petroleum Dongying 257061 China

In this paper, a finite-time controller for bank-to-turn (BTT,) missiles isdesigned based on nonsingular terminal sliding mode (NTSM,) technique. Theproposed controller allows that roll rate and angle of attack can track thedesired commands in finite-time with sideslip angle maintained in a small degreerange. Input/output (I/O) feedback linearizaiton technique is used in thecontroller design. Since the dynamics of BTT missile contains uncertainties,nonsingular terminal sliding mode control technique is applied to yield betterrobustness and disturbance rejection properties. Computer simulation results arepresented to validate the effectiveness of our method. ICIC International © 2009.

关键词： Disturbance rejection

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The comparison and application of corner detection algorithms

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Journal of Multimedia 2009年第6期4卷 435-441页

作者： Chen, Jie Zou, Li-hui Zhang, Juan Dou, Li-hua Education Ministry Key Laboratory of Complex System Intelligent Control and Decision Beijing Institute of Technology Beijing China Department of Automatic Control Beiing Institute of Technology Beijing China

Corners in images represent a lot of important information. Extracting corners accurately is significant to image processing, which can reduce much of the calculations. In this paper, two widely used corner detection algorithms, SUSAN and Harris corner detection algorithms which are both based on intensity, were compared in stability, noise immunity and complexity quantificationally via stability factor η, anti-noise factor ρ and the runtime of each algorithm. It concluded that Harris corner detection algorithm was superior to SUSAN corner detection algorithm on the whole. Moreover, SUSAN and Harris detection algorithms were improved by selecting an adaptive gray difference threshold and by changing directional differentials, respectively, and compared using these three criterions. In addition, SUSAN and Harris corner detectors were applied to an image matching experiment. It was verified that the quantitative evaluations of the corner detection algorithms were valid through calculating match efficiency, defined as correct matching corner pairs dividing by matching time, which can reflect the performances of a corner detection algorithm comprehensively. Furthermore, the better corner detector was used into image mosaic experiment, and the result was satisfied. The work of this paper can provide a direction to the improvement and the utilization of these two corner detection algorithms. © 2009 ACADEMY PUBLISHER.

关键词： Image matching

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A Minimized Zero Mean Entropy Approach to Networked control systems

A Minimized Zero Mean Entropy Approach to Networked Control ...

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Joint 48th IEEE Conference on Decision and control and 28th Chinese control Conference

作者： Jianhua Zhang Hong Wang Beijing Key Laboratory of Industrial Process Measurement & Control New Technology and System North China Electric Power University Control Systems Centre The University of Manchester

A novel control method is proposed for networked control systems with nonlinear process,probably non-Gaussian process noise and time *** performance index of closed loop control system consists of entropy,mean value and control energy *** stochastic control methods for networked control systems are given under the same general *** method utilizes gradient optimal techniques to obtain an optimal control law,and the stability of closed loop systems is *** other method gives the optimal solution of control law *** implementation issues are *** sliding window techniques and non-parametric probability density function estimation techniques are employed to obtain the entropy of tracking error *** a result,the controller can be on-line ***,the methodology is illustrated by simulations.

关键词： Gaussian A Minimized Zero Mean Entropy Approach to Networked control systems

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Design of an adaptive on-load de-icing scheme for overhead power transmission line

Design of an adaptive on-load de-icing scheme for overhead p...

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IEEE General Meeting Power& Energy Society

作者： Qi Huang Yong Chen Changhua Zhang Sichuan Provincial Key Laboratory of Power System Wide-area Measurement and Control University of Electronic Science and Technology Chengdu Sichuan China

This paper reports part of the results in the project to develop an on-load de-icing system. In the system, a high frequency high voltage excitation with adjustable frequency, is used to de-ice the ice covered on long power transmission line. The system is highly efficient in de-icing due to the joint heating effect brought by transmission line loss and dielectric loss. The mathematical model of the system is developed. And on the basis of analysis and numerical simulation results, an adaptive scheme is designed. In the system, networked sensors are deployed to monitor the ice condition on transmission line, and on-line regulate the frequency of the high-voltage excitation according to the monitored ice information, to ensure that there is no severe ice-covering spot on long transmission line.

关键词： Power transmission lines Frequency Ice Dielectric losses Propagation losses Condition monitoring Voltage Heating Mathematical model Numerical simulation

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Study of Sliding-Mode control Based Grid-side PWM Rectifier for Wind Power Generation system under Unbalanced Input Voltage Condition

Study of Sliding-Mode Control Based Grid-side PWM Rectifier ...

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IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Jianhua Zhang Xiaojun Li Guolian Hou Xuemin An Beijing Key Laboratory of Industrial Process Measurement & Control New Technology and System North China Electric Power University Beijing China

ISBN: (纸本)9781424427994

A sliding mode control scheme is presented in αβframe for grid-side PWM rectifiers in wind power generation systems. The positive and negative sequence voltages are needed to design the controller, nevertheless, the positive and negative sequence currents are not needed. This scheme is compared with the dual current control scheme in the rotating frame d-q. The simulation results show that sliding mode control scheme can realize unit power factor operation when the amplitude is unbalanced.

关键词： Grid-side PWM rectifier Unbalanced voltage Sliding-mode control

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Development of a tool for the analysis of power system higher order oscillation

Development of a tool for the analysis of power system highe...

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IEEE General Meeting Power& Energy Society

作者： Zhouqiang Wang Qi Huang Changhua Zhang Sichuan Provincial Key Laboratory of Power System Wide-area Measurement and Control University of Electronic Science and Technology Chengdu Sichuan China

The analysis of higher order modal interaction attracts much attention from scholars all over the world. The normal form theory and the modal series method offer new ideas for solving these problems. However, literature review and simulation show that modal analysis for a certain case with these approaches may obtain different results. In this paper, the currently available methods are integrated into a tool PSMAT (power system modal analysis tool), so that one can compare the results with different approaches, and then select the most appropriate method for his analysis purpose. The developed tool has all the functionalities in modal analysis as well as the quantitative indices. The design of the tool is described and case studies are presented. The results obtained with this tool are discussed. It is verified that this tool is effective, in both modal analysis and comparison of the approaches.

关键词： Power system analysis computing Modal analysis Power system modeling Power system simulation Power system stability Power system interconnection Taylor series Signal analysis Performance analysis Equations

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Adaptive sliding mode control for Takagi-Sugeno fuzzy systems

Adaptive sliding mode control for Takagi-Sugeno fuzzy system...

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48th IEEE Conference on Decision and control held jointly with 2009 28th Chinese control Conference, CDC/CCC 2009

作者： Zhang, Jinhui Shi, Peng Xia, Yuanqing Fu, Mengyin Key Laboratory of Complex System Intelligent Control and Decision School of Automation Beijing Institute of Technology Beijing 100081 China Faculty of Advanced Technology University of Glamorgan Pontypridd CF37 1DL United Kingdom School of Engineering and Science Victoria University Australia

ISBN: (纸本)9781424438716

This paper is devoted to robust adaptive sliding mode control for a class of nonlinear systems in the Takagi-Sugeno forms with mismatched parametric uncertainties. Sufficient conditions for the existence of linear sliding surfaces are given in terms of linear matrix inequalities, by which the corresponding adaptive reaching motion controller is also designed. Simulation studies show the effectiveness of the control scheme. ©2009 IEEE.

关键词： Linear matrix inequalities

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