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EP-based robustness analysis of optimal load allocation for boiler systems

IMA Journal of Mathematical control and Information 2009年第2期26卷 197-211页

作者： Tsai, Jason S.H. Du, Yan Yi Dunn, Alex C. Shieh, L.S. Control System Laboratory Department of Electrical Engineering National Cheng Kung University Tainan 701 Taiwan AfriTek Inc. 14019 Halprin Creek Dr. Cypress TX 77429 United States Department of Electrical and Computer Engineering University of Houston Houston TX 77204-4005 United States

Based on evolutionary programming, a universal approach to examine the non-analytic solution robustness of an optimal allocation methodology for industrial boilers that is designed based on the second-order gradient method is proposed in this paper. The allocation algorithm is easy to implement without any specialized software and the precise robustness analysis considers the worst-case scenario when uncertainty factors are introduced into some of the boiler system parameters. © The author 2009. Published by Oxford University Press on behalf of the Institute of Mathematics and its Applications. All rights reserved.

关键词： Boilers

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Wireless acoustic sensor network with compressive sampling

Wireless acoustic sensor network with compressive sampling

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IASTED International Conference on Modelling, Simulation, and Identification, MSI 2009

作者： Qiao, Daoe Luo, Hong Xu, Xiaoli Beijing Key Laboratory Measurement and Control of Mechanical and Electrical System Beijing Information Science and Technology University Beijing 100192 China School of Computer Science and Technology Beijing University of Posts and Telecommunications Beijing 100876 China

ISBN: (纸本)9780889868106

We design a complete platform of wireless acoustic sensor network, featuring with compressive sampling and adaptive sampling. The compressive sampling is a new theory that combines sampling and compression into a single linear measurement process. It captures signals at a rate significantly below the Nyquist rate, and recovers exactly the original signals using convex optimization or greedy algorithm. In addition, we adopt an adaptive sampling scheme, in which the sampling rates can be changed with the running stages. The detective stage works at a lower rate than the monitoring stage. There is only one sensor node running at monitoring stage for the interested event. Through experiments, we illustrate that the wireless acoustic sensor network we built achieves dramatic low sampling rate and utilizes the network bandwidth much more effective.

关键词： Compressed sensing

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On the identification of LPV traffic flow model 10

On the identification of LPV traffic flow model

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2009 10th European control Conference, ECC 2009

作者： Luspay, T. Kulcsar, B. Van Wingerden, J.W. Verhaegen, M. Systems and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences Kende u. 13.-17 BudapestH-1111 Hungary Delft Center for System and Control Faculty of Mechanical Maritime and Materials Engineering Technical University of Delft Mekelweg 2 Delft Netherlands

ISBN: (纸本)9783952417393

关键词： LPV Identification Linear Parameter Varying (LPV) systems freeway traffic modeling Traffic flow Authentication Subspace systems comparison Loop detector nonlinearity Flow models

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Analysis of synchronous generator electro-magnetic torque and vibration with armature winding fault

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Tianjin Daxue Xuebao (Ziran Kexue yu Gongcheng Jishu Ban)/Journal of Tianjin University Science and Technology 2009年第4期42卷 322-326页

作者： Fang, Hong-Wei Xia, Chang-Liang Li, Guo-Ping Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin 300072 China Beijing Chatone Computer Room Equipment Company Beijing 100101 China

The air-gap magnetic field characteristic of the synchronous generator, caused by stator winding inter-turn short circuit fault, was analyzed in this paper with a consideration of the air-gap eccentricity. Then the characteristics of electro-magnetic torque and vibration of generator were obtained, especially the magnitudes and frequency variation of the instantaneous pulse torque. And the characteristic of the 17th and 19th order component of terminal current under this condition was also analyzed by the coupled field-circuit method. Lastly, in the dynamic simulation experiment, the vibration acceleration data in the vertical direction of a 7.5 kVA generator with stator winding inter-turn short circuit fault were acquired, and then these data were analyzed by discrete fast Fourier technique. The results show that the change of the double frequency vibration acceleration is bigger when stator winding inter-turn short circuit faults occur and the 17th and 19th order component of terminal current can be used to detect the dynamic eccentricity of machines with or without internal faults.

关键词： Stators

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An alternative formulation of the interpolation based constrained H∞ control of discrete-time LPV systems 10

An alternative formulation of the interpolation based constr...

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2009 10th European control Conference, ECC 2009

作者： Peni, Tamas Kulcsar, Balazs Bokor, Jozsef Systems and Control Laboratory Computer Automation Research Institute Hungarian Academy of Sciences P.O.Box 63 BudapestH-1518 Hungary Delft Center for System and Control Faculty of Mech. Maritime and Materials Eng. Technical University of Delft Mekelweg 2 Delft2628CD Netherlands

ISBN: (纸本)9783952417393

The paper presents an alternative formulation of the interpolation based constrained H∞ control presented originally in [16], [12], [17]. The concept itself has not been changed: by interpolating among unconstrained state feedback gains both the H∞ performance and the satisfaction of the hard state, input and output constraints can be guaranteed. The novelty is in the computation of the region of applicability of the controller. It is now based on the d-invariant sets of the individual controllers and not on the high dimensional extended system comprising all of the closed loops generated by the controllers. © 2009 EUCA.

关键词： controllers

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Distributed state and unknown input estimation for freeway traffic flow models 10

Distributed state and unknown input estimation for freeway t...

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2009 10th European control Conference, ECC 2009

作者： Luspay, T. Kulcsar, B. Tettamanti, T. Varga, I. Bokor, J. Systems and Control Laboratory Computer and Automation Research Institute HAS Kende u. 13.-17 BudapestH-1111 Hungary Delft Center for System and Control Faculty of Mechanical Maritime and Materials Engineering Technical University of Delft Mekelweg 2 Delft Netherlands Department of Control and Transport Automation Budapest University of Technology and Economics Bertalan L. u. 2 BudapestH-1111 Hungary

ISBN: (纸本)9783952417393

The paper presents a joint state and unmeasured input estimation technique for a special class of nonlinear second order macroscopic traffic model. The freeway traffic system is transformed into a quasi and affine approximate Lin- ear Parameter Varying (LPV) form. Observer design technique is formulated using off-line optimization problem subjected to Linear Matrix Inequality (LMI) conditions, considering uncertain scheduling parameters. Furthermore, locally designed state estimators are interconnected to cover multiple freeway sections. The elaborated method is validated using real traffic measurements. © 2009 EUCA.

关键词： Linear matrix inequalities

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Discrete time minimax tracking control with state and disturbance estimation II: Time-varying reference and disturbance signals

Discrete time minimax tracking control with state and distur...

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Mediterranean Conference on control and Automation (MED)

作者： P. Bauer B. Kulcsar J. Bokor Systems and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences (ATOMKI) Budapest Hungary Delft Center for System and Control Faculty 3ME Delft University of Technnology Delft Netherlands

The paper characterizes the properties of discrete time minimax tracking control problem in the case of time varying references and disturbances. Hereunder, a multi step tracking control synthesis is suggested for linear time invariant (LTI) plants when the reference signal could be time dependent. Moreover, instead of directly rejecting the effect of the (time varying) disturbance signal, an intermediate estimation and centering step is proposed. This step eliminates the main part of the disturbance by its unbiased estimate. The solution combines the state and disturbance estimation with linear quadratic and optimal minimax tracking design. The resulted unified control solution is LQ optimal on infinite horizon with constant references and disturbances and sub-optimal on large horizons with time-varying references and disturbances. The paper clarify the effect of the time varying signals on the stability and performance criteria. The multi step procedure is illustrated via an ascending spiral trajectory tracking simulation of a quadrotor helicopter.

关键词： Minimax techniques State estimation Automatic control control systems Optimal control Trajectory Helicopters Stochastic systems Fuzzy logic Noise measurement

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Quantized Feedback Stabilization of Hybrid Impulsive control systems

Quantized Feedback Stabilization of Hybrid Impulsive Control...

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

作者： Zhichun Yang Yiguang Hong Zhong-Ping Jiang Xiaoli Wang Chongqing Key Lab of Operations Research and System Engineering Department of Mathematics and Computer ScienceChongqing Normal University Institute of Systems Science Chinese Academy of Sciences Key Laboratory of Systems and Control Institute of Systems ScienceChinese Academy of Sciences Dept.of Electrical & Computer Engineering Polytechnic Institute of New York University

In this paper,we consider the feedback stabilization problem of impulsive linear control systems with quantized input signals and quantized output *** concepts including quasi-invariant sets and attracting sets for hybrid impulsive quantized systems are *** on these concepts and the analysis of related dynamic properties,we propose hybrid quantized control schemes to stabilize the considered impulsive systems via state and output feedback.

关键词： quantization impulsive systems hybrid control stabilization

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Wave-front arrival time analysis using wide-area frequency measurements

Wave-front arrival time analysis using wide-area frequency m...

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IEEE General Meeting Power& Energy Society

作者： Jing Ma Jinlong Li Zengping Wang Jie Wu Tao Xia Lang Chen Yilu Liu School of Electrical and Electronic Engineering North China Electric Power University Beijing China Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute Blacksburg VA USA Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China Zhejiang Electric Power Design Institute Hangzhou China

Due to the influence of the local noise at the distribution level, the frequency curve obtained from the frequency disturbance recorder (FDR) unit is too non-stationary to observe its wave-front directly, which causes some problems in the event location estimation method. In this paper, a morphological filter (MF) is employed to extract the wave-front arrival time and the trend of the frequency curve. With the help of the MF, the accuracy of the event location method is greatly improved.

关键词： Frequency measurement Frequency estimation Power system measurements Network servers Wide area measurements Filters Web server Global Positioning system Frequency synchronization Power system dynamics

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Dynamic security risk assessment and optimization of power transmission system

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Science China(Technological Sciences) 2008年第6期51卷 713-723页

作者： YU YiXin1 & WANG DongTao1,2 1 Key laboratory of Power system Simulation and control of Ministry of Education, Tianjin University, Tianjin 300072, China 2 School of computer & Automation, Hebei Polytechnic University, Tangshan 063009, China 1. Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin 300072 China 2. School of Computer & Automation Hebei Polytechnic University Tangshan 063009 China

The paper presents a practical dynamic security region (PDSR) based dynamic security risk assessment and optimization model for power transmission system. The cost of comprehensive security control and the influence of uncertainties of power injections are considered in the model of dynamic security risk assessment. The transient stability constraints and uncertainties of power injections can be considered easily by PDSR in form of hyper-box. A method to define and classify contingency set is presented, and a risk control optimization model is given which takes total dynamic insecurity risk as the objective function for a dominant con-tingency set. An optimal solution of dynamic insecurity risk is obtained by opti-mizing preventive and emergency control cost and contingency set decomposition. The effectiveness of this model has been proved by test results on the New Eng-land 10-genarator 39-bus system.

关键词： power transmission system risk assessment dynamic security practical dynamic security region (PDSR) comprehensive security control optimization

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