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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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Robust specification influence on feedback control strategies 15th

Robust specification influence on feedback control strategie...

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15th World Congress of the International Federation of automatic control, 2002

作者： Gil-Martínez, M. García-Sanz, M. System Engineering and Automation Group Electrical Engineering Department University of La Rioja Luis de Ulloa 20 Logroño26004 Spain Automatic Control and Computer Science Department Public University of Navarra Campus Arrosadía Pamplona31006 Spain

ISBN: (纸本)9783902661746

The feedback control structures are required in the presence of any kind of uncertainty. The benefits of the feedback are mainly paid with an excessive bandwidth that amplifies the sensor noise, saturating the actuators. This implies the necessity of design tradeoffs highly transparent from the Quantitative Feedback Theory. Supposing a given uncertainty for a plant, the set of performance and stability requirements will condition the problem solution. Taking advantage of the QFT bound typology and formulation, the contribution of the robust specification values to their simultaneous achievement will be analysed and particularly as regards the challenging task of the controller design. Copyright © 2002 IFAC.

关键词： controllers

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Detection and classification of turn fault and high-resistance connection fault in inverter-fed permanent magnet machines based on high-frequency signals

Detection and classification of turn fault and high-resistan...

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作者： Hu, Rongguang Wang, Jiabin Mills, Andrew Chong, Ellis Sun, Zhigang Department of Electronics and Electrical Engineering University of Sheffield Sheffield United Kingdom Department of Automatic Control and System Engineering University of Sheffield Sheffield United Kingdom Electrical Capability Group Rolls-Royce plc Derby United Kingdom

Winding turn fault and high-resistance connection (HRC) fault will lead to different consequences and require different mitigation actions. In this study, the differentiating features between a turn fault and HRC fault are analysed and compared in a three-phase surface-mounted permanent magnet machine fed by the inverter with pulse-width-modulation voltages. The resultant high-frequency components in both voltages and currents are utilised for the fault detection and classification based on the high-frequency impedance and ripple current, without requiring modifications to the machine or interface design. Extensive simulations show that this method is capable of fault detection and classification in both transient and steady-state operations. © 2019 Institution of engineering and Technology. All rights reserved.

关键词： Permanent magnets

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A New Architecture for Robust Model Reference control

A New Architecture for Robust Model Reference Control

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IEEE Conference on Decision and control

作者： C. Pedret R. Vilanova R. Moreno I. Serra System Engineering and Automatic Control Group ETSE Universitat Authnòma de Barcelona Bellaterra Spain

A new controller configuration for Robust Model Reference control is presented in this paper. The structure is based on a right coprime factorization of the plant and makes use of an observer-based feedback control scheme combined with a prefilter controller. It is designed first to guarantee stability robustness and some levels of performance in terms of disturbance rejection. This is done by solving a constrained H ∞ optimization problem using the right coprime factorization of the plant in an active way. Secondly, the prefilter controller is designed to guarantee robust open-loop processing of the reference commands. This is done by assuming a Reference Model and by solving a Model Matching Problem.

关键词： Robust control Open loop systems Robust stability Feedback control control systems Uncertainty Adaptive control control system synthesis automatic control Constraint optimization

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Robust tracking performance enhancement through uncertainty division

Robust tracking performance enhancement through uncertainty ...

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2003 European control Conference, ECC 2003

ISBN: (纸本)9783952417379

When the process uncertainty size increases, even linear minimum phase systems must sacrifice desirable aggressive feedback control benefits to avoid an excessive 'cost of feedback', while preserving the robust stability. With a suitable uncertainty division and a QFT controller-prefilter to command each uncertainty subset inside a controller-scheduler structure, it is possible to enhance the feedback tracking performance without an excessive bandwidth. To preserve the robust stability from any failure in the switching, each controller is designed to be stable in the whole uncertainty domain, and as accurate in command tracking as desired in its uncertainty subset. © 2003 EUCA.

关键词： Robust control

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Plant uncertainty contribution to QFT Tracking control design 4

Plant uncertainty contribution to QFT Tracking control desig...

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4th IFAC Symposium on Robust control Design, ROCOND 2003

作者： Martínez, G.-M. Sanz, G.-M. System Engineering and Automation Group Electrical Engineering Department University of La Rioja Luis de Ulloa. 20 Logrono26004 Spain Automatic Control and Computer Science Department Public University of Navarra Campus Arrosadia s/n Pamplona31006 Spain

Tracking feedback control trade-offs increase dangerously with arbitrarily large uncertainties in the process mode!. This is shown by the bounds in the QFT domain. In this context, the paper develops a theory on the contribution of the plant uncertainty to the tracking QFT bounds through a serious study of tracking bound formulas. From this, a methodology for uncertainty fragmentation is developed. It hopes to loosen the bound toughness, or the control design trade-offs. Better feedback benefits can be achieved while reducing the high-frequency amplification of noises and disturbances at the plant input at the same time. Different QFT controllers in a controller-scheduler structure should drive different uncertainty boundaries. © 2003 IFAC.

关键词： Robust control

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Communication Scheduling in Robust Self-Triggered MPC for Linear Discrete-Time systems ∗

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IFAC-PapersOnLine 2015年第22期48卷 132-137页

作者： Florian D. Brunner T.M.P. Gommans W.P.M.H. Heemels Frank Allgöwer Institute for Systems Theory and Automatic Control University of Stuttgart Pfaffenwaldring 9 70569 Stuttgart Germany Control System Technology Group Department of Mechanical Engineering Eindhoven University of Technology The Netherlands

We consider a networked control system consisting of a physical plant, an actuator, a sensor, and a controller that is connected to the actuator and sensor via a communication network. The plant is described by a linear discrete-time system subject to additive disturbances. In order to reduce the required number of communications in the system, we propose a robust self-triggered model predictive controller based on rollout techniques that robustly asymptotically stabilizes a certain periodic sequence of sets in the state space while guaranteeing robust satisfaction of hard state and input constraints. At periodically occurring scheduling times, the self-triggered model predictive control algorithm determines the times at which the control input and plant measurement are updated in the time span until the next scheduling time. We establish a certain upper bound on the average sampling rate in the closed-loop system. Moreover, we show how increasing the asymptotic bound on the system state, which is a design parameter in the control scheme, can be used to further reduce the average number of communications in the system.

关键词： predictive control self-triggered control robustness

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Behavioral model identification

Behavioral model identification

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IEEE Conference on Decision and control

作者： R. Johansson M. Verhaegen C.T. Chou A. Robertsson Department of Automatic Control Lund Institute of Technology Lund University Lund Sweden Department of Electrical Engineering System and Control Engineering Group TU Delft Delft Netherlands

This paper presents theory and algorithms for system identification suitable for the framework of behavioral system theory. An algorithm based on algebraic system theory and realization theory (Ho-Kalman realization) in a subspace model identification framework is presented. The novel approach considered consists of the formulation of input-output data as an impulse response model and the subsequent application of state-space realization. As a special case, behavioral model identification from finite data sequences is demonstrated.

关键词： Power system modeling system identification Context modeling Matrix decomposition control engineering Fitting Mathematical model Data analysis Linear systems Regression analysis

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The response surface methodology for rapid prototyping of real-time control systems

The response surface methodology for rapid prototyping of re...

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American control Conference (ACC)

作者： P. Stewart P.J. Fleming Department of Electrical Engineering Electrical Machines and Drives Group University of Sheffield Sheffield UK Department of Automatic Control and System Engineering University of Sheffield UK

This paper investigates the use of a production control technique known as the Response Surface methodology as a rapid prototyping tool for real time control design. The problem under consideration here is the response of automotive drivetrains to aggressive driver input. The first torsional mode (otherwise known as "shuffle" mode) of automotive drivelines is excited by torque transients and is typically around 2-5 Hz. The effect is particularly severe during step changes from the throttle pedal ("tip in" or "tip out"), manifesting itself as an undesirable low frequency longitudinal acceleration oscillation, leading to driver discomfort. The control of this aspect of "driveability" (the error between expected vehicle response and actual vehicle response to an arbitrary control input) is examined, using feedforward control. The overriding principle to be obtained in this examination is the assessment of electronic throttle control in the context of rapid prototyping. The response surface methodology is adopted to achieve this goal. The potential of the electronic throttle for launch control is analyzed and experimentally verified.

关键词： Response surface methodology Prototypes Real time systems control systems Automotive engineering Vehicle driving Production control control design Torque Frequency

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Resource-aware set-valued estimation for discrete-time linear systems

Resource-aware set-valued estimation for discrete-time linea...

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IEEE Annual Conference on Decision and control

作者： F. D. Brunner T. M. P. Gommans W. P. M. H. Heemels F. Allgowert Institute for Systems Theory and Automatic Control (IST) University of Stuttgart 70550 Stuttgart Germany Control System Technology group Department of Mechanical Engineering Eindhoven University of Technology

ISBN: (纸本)9781479978878

In this paper, we propose a self-triggered estimator for discrete-time linear systems subject to unknown but bounded disturbances affecting both the system states and outputs. The proposed self-triggered estimator is a set-valued estimator that employs rollout techniques to reduce the communication between the sensors and the estimator with respect to a periodic sampling strategy. Moreover, at each time instant it provides an estimate of the plant state and a guaranteed bound on the difference between the true plant state and the estimate.

关键词： Linear system discrete-time discrete time systems Unknown Sensors Communication Research

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