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European control Conference (ECC)

作者： Christakis Papageorgiou Oliver G. Lockwood Neil E. Houghton Malcolm C. Smith EPSRC and DTI C. Papageorgiou Researcher in the Automatic Control group at the University of Linkoping Linkoping Sweden Department of Engineering University of Cambridge Cambridge UK

This paper presents experimental results and a modelling study of a prototype mechanical device that represents a novel steering compensator for high-performance motorcycles. The mechanical device is different from conventional damper devices since it has been designed to represent a series combination of a damper and an inerter. The ideal inerter is a one-port mechanical element which is the exact analogue of the capacitor under the force-current analogy between mechanical and electrical networks, so that the force (torque) through the device is proportional to the relative acceleration (angular acceleration) across its terminals. The steering compensator is tested on a hydraulic test rig and the experimental admittance of the device is calculated over a specified frequency range. A model of the device is developed, including parasitic effects and nonlinearities, which achieves a good fit between model and experimental data.

关键词： Admittance Friction Shock absorbers Motorcycles Springs Mathematical model Random access memory

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control of Line-Interactive UPS Connected in Parallel Forming a Microgrid

Control of Line-Interactive UPS Connected in Parallel Formin...

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Josep M. Guerrero Nestor Berbel Jose Matas Jorge L. Sosa Luis Garcia de Vicuna Sustainable Distributed Generation and Renewable Energy research group Department Automatic Control Systems Escola Universtària d'Enginyeria Tècnica Industrial de Barcelona Barcelona Spain Department of Electronic Engineering Universitat Poliltècnica de Catalunya Spain

In this paper, the control strategy for an overall microgrid is presented. The control has two main levels: (i) the droop control of the inverters, and (ii) the control of the static bypass switch, and the droop settings for the management of the power flow. Thus, a flexible microgrid is obtained to operate in either grid-connected or islanded mode. Results from line- interactive UPS inverters connected in parallel forming a microgrid are presented, showing the feasibility of the presented solution.

关键词： Uninterruptible power systems Switches automatic control Inverters Distributed control Renewable energy resources Energy management Photovoltaic systems Solar power generation Power generation

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The Stability Analysis of the Adaptive Fading Extended Kalman Filter

The Stability Analysis of the Adaptive Fading Extended Kalma...

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IEEE Conference on control Technology and Applications (CCTA)

作者： Kwang Hoon Kim Jang Gyu Lee Chan Gook Park Gyu In Jee Department of Electronics Engineering Brain Korea 21 Research Group Konkuk University Seoul South Korea School of Electrical Engineering and Computer Science and Automatic Control Research Center Seoul National University Seoul South Korea School of Mechanical and Aerospace Engineering and Institute of Advanced Aerospace Technology Seoul National University Seoul South Korea Department of Electronics Engineering Konkuk University Seoul South Korea

The well-known conventional Kalman filter gives the optimal solution but requires an accurate system model and exact stochastic information. Thus, the Kalman filter with incomplete information may be degraded or even diverged. In a number of practical situations, the system model and the stochastic information are incomplete. To solve this problem, a new adaptive fading Kalman filter (AFKF) using the forgetting factor has recently been proposed. This paper extends the AFKF to nonlinear system models to obtain an adaptive fading extended Kalman filter (AFEKF). The forgetting factor is generated from the ratio between the calculated innovation covariance and the estimated innovation covariance. Based on the analysis result of Reif for the EKF, the stability of the AFEKF is also analyzed.

关键词： Stability analysis Fading Stochastic systems Nonlinear equations Nonlinear systems Information filtering Information filters Adaptive filters control systems Degradation

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Droop control Method with Virtual Output Impedance for Parallel Operation of Uninterruptible Power Supply systems in a Microgrid

Droop Control Method with Virtual Output Impedance for Paral...

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Twenty-Second Annual IEEE Applied Power Electronics Conference and Exposition (APEC 07), vol.2

作者： Josep M. Guerrero Nestor Berbel Jose Matas Jorge L. Sosa Luis Garcia de Vicuna Sustainable Distributed Generation Systems and Renewable Energy Group Department of Automatic Control Systems and Computer Engineering Escola Universitària d'Enginyeria Tècnica Industrial de Barcelona Barcelona Spain Department of Electronic Engineering Universitat Poliltècnica de Catalunya Barcelona Spain Department de Enginyeria Electrònica Universitat Poliltècnica de Catalunya Barcelona Spain

In this paper, a novel droop control scheme applied to distributed UPSs forming a microgrid is proposed. The control architecture consists of two levels of hierarchy: 1) the P/Q droop control method of every UPS unit and 2) the management of the microgrid through the control of the setpoints of the units and the intelligent switch connected to the strong grid. This second level of control let us to connect or disconnect the microgrid to the utility mains, resulting in two scenarios: grid-connected and islanding operation mode. Also, it is taken into account the seamlessly transition between both operation modes, the possibility to share power with the utility grid, and the energy management of the overall system.

关键词： control systems Impedance Uninterruptible power systems Inverters Switches Distributed control Power engineering and energy Energy management Photovoltaic systems Solar power generation

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Influence of scaling and unfolding in PCA based monitoring of nutrient removing batch process

Influence of scaling and unfolding in PCA based monitoring o...

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作者： Ruiz, Magda Villez, Kris Sin, Gurkan Colomer, Joan Vanrrolleghem, Peter Control Engineering and Intelligent Systems Group -eXiT Department of Electronics Computer Science and Automatic Control University of Girona CP 17071 Girona Spain Department of Applied Mathematics Biometrics and Process Control Ghent University Coupure Links 653 B-9000 Ghent Belgium

ISBN: (纸本)9783902661142

The data set of batch biological and biotechnological processes can be organized in a three-way data matrix. In this paper the usefulness of different PCA approaches for monitoring is analyzed. Different ways of unfolding and scaling of data have been applied to a pilot-scale SBR data. PCA is used to reduce the dimensionality and to remove the non-linearity dynamic of the data. Moreover, a new method to select the number of principal components is proposed. Loadings graphics are used to determinate the predominant variables for each one. The results show that whatever model can be applied depending on the goal of the monitoring, however the models implicate possible false alarms or faults omission. Copyright © 2006 IFAC.

关键词： Process monitoring

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Simulation and experimental studies of hybrid learning control with acceleration feedback for flexible manipulators

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8th International Conference on Climbing and Walking Robots and the Support Technologies for Mobile Machines, CLAWAR 2005

作者： Md Zain, M.Z. Alam, M.S. Tokhi, M.O. Mohamed, Z. Department of Automatic Control and Systems Engineering University of Sheffield United Kingdom Faculty of Electrical Engineering Universiti Teknologi Malaysia 81310 UTM Skudai Malaysia

ISBN: (纸本)3540264132

This paper presents investigations at developing a hybrid iterative learning control scheme with acceleration feedback (PDILCAF) for flexible robot manipulators. An experimental flexible manipulator rig and corresponding simulation environment are used to demonstrate the effectiveness of the proposed control strategy. In this work the dynamic model of the flexible manipulator is derived using the finite element (FE) method. A collocated proportional- derivative (PD) controller utilizing hub-angle and hub-velocity feedback is developed for control of rigid-body motion of the system. This is then extended to incorporate iterative learning control with acceleration feedback and genetic algorithms (GAs) for optimization of the learning parameters for control of vibration (flexible motion) of the system. The system performance with the controllers is presented and analysed in the time and frequency domains. The performance of the hybrid learning control scheme without and with acceleration feedback is assessed in terms of input tracking, level of vibration reduction at resonance modes and robustness with various. © 2006 Springer-Verlag Berlin Heidelberg.

关键词： Genetic algorithms

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Drinking water distribution system modelling - An approach to skeletonization

Drinking water distribution system modelling - An approach t...

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1st IFAC Workshop on Applications of Large Scale Industrial systems, ALSIS'06

作者： Duzinkiewicz, K. Ciminski, A. Department of Automatic Control Technical University of Gdansk ul. G. Narutowicza 11/12 80-952 Gdansk Poland Department of Control Engineering Intelligent Decision Support and Control System Group Gdansk University of Technology Narutowicza 11/12 80-952 Gdansk Poland

ISBN: (纸本)9783902661159

An optimisation based approach to simplification of a network model of pressurized drinking water distribution systems (DWDS), called skeletonization, has been proposed. DWDS simulation has been improved considerably during the last decades. There are two major aspects in modelling, monitoring and control of DWDS: quantity (water hydraulics) and quality. In the following paper the modelling of the water hydraulics in DWDS is considered. There is a need to build a simplified model of the drinking water network that preserves relation between flows and pressures in the main pipes and contains elements essentials for control - tanks, pumps, valves or others. The degree of simplification should be a compromise between needed model's accuracy and computational efficiency of the monitoring and control algorithms. Different approaches are proposed for DWDS model simplification. In the proposed method some parts of the network structure remain unchanged and the others are replaced by a simple radial structure. Parameters of the radial structure are calculated by solving dedicated optimisation problem. The simplification results based on the proposed method are illustrated by simulation case study for physical drinking-water distribution system and a comparison with the result obtained based on common sense method are presented. Copyright © 2006 IFAC.

关键词： Computational efficiency

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Obituary

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European Journal of control 2006年第3期12卷 346-348页

作者： Ron Patton Steven Ding Control & Intelligent Systems Engineering Research group Department of Engineering Faculty of Applied Science & Technology The University of Hull UK Institute for Automatic Control and Complex Systems (AKS) Faculty of Engineering University of Duisburg-Essen Germany

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Reverse Search for Parametric Linear Programming

Reverse Search for Parametric Linear Programming

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IEEE Conference on Decision and control

作者： Colin N. Jones Jan M. Maciejowski Automatic Control Laboratory Swiss Federal Institute of Technology Zurich Switzerland Control Group Department of Engineering University of Cambridge Cambridge UK

ISBN: (纸本)1424401704;9781424401703

This paper introduces a new enumeration technique for (multi)parametric linear programs (pLPs) based on the reverse-search paradigm. We prove that the proposed algorithm has a computational complexity that is linear in the size of the output (number of so-called critical regions) and a constant space complexity. This is an improvement over the quadratic and linear computational and space complexities of current approaches. Current implementations of the proposed approach become faster than existing methods for large problems. Extensions of this method are proposed that make the computational requirements lower than those of existing approaches in all cases, while allowing for efficient parallelisation and bounded memory usage

关键词： Linear programming Computational complexity Sampling methods Optimal control control systems USA Councils Laboratories Concurrent computing Predictive models Costs

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INFLUENCE OF SCALING AND UNFOLDING IN PCA BASED MONITORING OF NUTRIENT REMOVING BATCH PROCESS

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IFAC Proceedings Volumes 2006年第13期39卷 114-119页

作者： Magda Ruiz Kris Villez Gurkan Sin Joan Colomer Peter Vanrrolleghem 1Control Engineering and Intelligent Systems Group –eXiT Department of Electronics Computer Science and Automatic Control University of Girona Campus Montilivi CP 17071 Building PIV Girona - Spain Department of Applied Mathematics Biometrics and Process Control Ghent University Coupure Links 653 B-9000 Ghent – Belgium

关键词： Biological Process Process monitoring Multiway Principal Component Analysis (MPCA)

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