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共 495 条记录，以下是241-250 订阅

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Fuzzy scheduler control for wind energy conversion systems subject to parameter uncertainties

Fuzzy scheduler control for wind energy conversion systems s...

引用

14th IFAC symposium on Information control Problems in Manufacturing, INCOM'12

作者： Kamal, E. Aitouche, A. Ghorbani, R. Bayart, M. LAGIS FRE CNRS 3033 Lille University Nord France Polytech-Lille Rue Paul Langevin 59655 Villeneuve d'Ascq France HEI 13 rue de Toul 59046 Lille Cedex France Mechanical Engineering University of Hawaii Manoa 2540 Dole St. - Holmes Hall 201 Honolulu HI United States

ISBN: (纸本)9783902661982

This paper addresses the design of Robust Fuzzy Scheduler controller (RFSC) for nonlinear systems which is robust enough to stabilize an uncertain nonlinear system and gives an acceptable closed-loop performance in presence of parametric uncertainties, disturbances, and state variables unavailable for measurements. The "Takagi-Sugeno" (TS) fuzzy model system with parametric uncertainties is adopted for modeling the nonlinear Hybrid Wind-Diesel Storage System (HWDSS) and establishing fuzzy state observers. Sufficient conditions are derived for robust stabilization and are formulated with Linear Matrix Inequalities (LMIs). To illustrate the effectiveness of the proposed RFSC and the fuzzy observer design methodology, they are applied to a HWDSS subjected to uncertain parameters. © 2012 IFAC.

关键词： nonlinear systems

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An FDI scheme for a satellite based on a multivariable super-twisting sliding mode approach

An FDI scheme for a satellite based on a multivariable super...

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8th IFAC symposium on Fault Detection, Supervision and Safety of Technical Processes, SAFEPROCESS 2012

作者： Nagesh, Indira Edwards, Christopher Control and Research Group Department of Engineering University of Leicester United Kingdom Department of Engineering University of Leicester United Kingdom

ISBN: (纸本)9783902823090

This paper proposes a super-twisting sliding mode observer structure for the multivariable case when many interdependent measurements are available. This structure is used to create a second order sliding mode observer to detect and isolate gyro faults for a satellite system. A least squares approach for an overdetermined system is used to detect the presence of a sensor fault, and once the fault is detected, isolation is attempted. A generalized bank of nonlinear observers based on multivariable super-twisting-sliding mode observers is designed to isolate the faulty sensor. The use of higher order sliding modes eliminates the chattering problem encountered in traditional sliding modes while retaining its robustness properties. The proposed design is verified on a nonlinear satellite model for various fault scenarios. © 2012 IFAC.

关键词： Satellites

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Robust fault estimation and performance evaluation based upon the ADDSAFE benchmark model

Robust fault estimation and performance evaluation based upo...

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8th IFAC symposium on Fault Detection, Supervision and Safety of Technical Processes, SAFEPROCESS 2012

作者： Chen, Lejun Patton, Ron J. Goupil, Philippe Department of Engineering University of Hull Hull HU6 7RX United Kingdom Flight Control System Airbus Operations S.A.S. 316 Route de Bayonne 31060 Toulouse Cedex 09 France

ISBN: (纸本)9783902823090

This work is motivated through a European Union FP7 funded project entitled Advanced Fault Diagnosis for Sustainable Flight Guidance and control (ADDSAFE), following an interest in implementing a mixed quadratic linear parameter-varying (LPV) H/H∞ model-based fault detection and isolation/diagnosis (FDI/FDD) observer. The approach uses free parameterised observer gains, on a high fidelity nonlinear aircraft model from AIRBUS, in order to estimate the various fault scenarios occurring for different flight conditions. The main design goal is to maximize the robustness of the reference-actual residual error signal to nonlinear uncertainty, disturbances, faults and system inputs, whilst also achieving the specific minimum sensitivity of the actual residual signal to faults. Considering sources from various fault occurrences, the local actuator model and the global aircraft model are used in observer estimation schemes to estimate simultaneously the ADIRS yaw rate sensor faults and the abnormal aircraft configurations. The detection results are evaluated on the ADDSAFE Functional Engineering Simulator (FES). © 2012 IFAC.

关键词： Fault detection

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Distributed sensor fault detection and isolation for nonlinear uncertain systems

Distributed sensor fault detection and isolation for nonline...

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8th IFAC symposium on Fault Detection, Supervision and Safety of Technical Processes, SAFEPROCESS 2012

作者： Reppa, Vasso Polycarpou, Marios M. Panayiotou, Christos G. KIOS Research Center for Intelligent Systems and Networks Electrical and Computer Engineering Department University of Cyprus Nicosia 1678 Cyprus

ISBN: (纸本)9783902823090

This paper presents a design methodology and some analytical results for distributed sensor fault detection and isolation (SFDI) of a class of nonlinear uncertain systems. The proposed architecture is based on the design of local SFDI modules, which monitor the healthy operation of a set of sensors and aim to detect the faults in this set, using a dedicated nonlinear observer scheme. The multiple sensor fault isolation procedure is further enhanced by deriving a combinatorial decision logic that processes information from local SFDI modules. The performance of the proposed diagnostic scheme is analyzed in terms of its robustness with respect to the modeling uncertainties and conditions for ensuring fault detectability and isolability. © 2012 IFAC.

关键词： Fault detection

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Takagi-Sugeno sliding mode observer design for fault diagnosis in pitch control systems of wind turbines

Takagi-Sugeno sliding mode observer design for fault diagnos...

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8th IFAC symposium on Fault Detection, Supervision and Safety of Technical Processes, SAFEPROCESS 2012

作者： Schulte, Horst Zajac, Michal Gerland, Patrick HTW-Berlin Department of Engineering I Control Group Wilhelminenhofstr. 75A 12459 Berlin Germany Volkswagen AG 34225 Baunatal Germany

ISBN: (纸本)9783902823090

The performance and reliability of the pitch control systems significantly influences the functional safety of wind turbines. In this paper an observer-based fault detection approach for a class of nonlinear systems, which can be modeled by Takagi-Sugeno (TS) fuzzy models, is presented and applied to electro mechanical pitch drive systems of wind turbines. To achieve robustness we propose a TS fuzzy observers combined with sliding mode that deals with unmeasurable premise variables, bounded uncertainties in the plant and allows fault estimation based on an equivalent output error injection approach. The stability of the error dynamics is ensured by linear matrix inequality (LMI) conditions. Based on a derived physical model of the pitch drive system and the unknown but bounded wind loads the robust observer is systematically designed using the TS system form of the plant. Simulation results demonstrate the effectiveness of the proposed scheme. © 2012 IFAC.

关键词： Failure analysis

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Output feedback control for induction machine in presence of nonlinear magnetic characteristic

Output feedback control for induction machine in presence of...

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8th Power Plant and Power System control symposium, PPPSC 2012

作者： El Fadili, A. Giri, F. El Magri, A. Lajouad, R. Chaoui, F.Z. GREYC Lab. University of Caen 14032 Caen France

ISBN: (纸本)9783902823243

Output feedback control of induction motors has recently been given a great deal of interest. It consists in resorting to observers to avoid mechanical (speed, torque) sensors and make the control system more reliable. The point is that all existing solutions have been developed based on the assumption that the machine magnetic circuit characteristic is linear which is not true in practice, due to magnetic saturation. Ignoring this saturation effect makes it impossible to meet optimal operation conditions in presence of wide range speed and load torque variations. This paper presents an output feedback control design that accounts this saturation effect. The controller includes an interconnected observer, an optimal flux reference generator and a control law obtained using the backstepping design technique. It is shown that the controller regulates well the motor speed and the rotor flux in presence of wide range variations of the machine speed reference and load torque.

关键词： Induction motors

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Comparing approaches to constrained design of integrating controllers

Comparing approaches to constrained design of integrating co...

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9th IFAC symposium on Advances in control Education, ACE 2012

作者： Huba, Mikulas Ťapák, Peter Institute of Control and Industrial Informatics FEI STU Ilkovičova 3 812 19 Bratislava Slovakia Fern Universität in Hagen FMI PRT Hagen Germany

ISBN: (纸本)9783902823014

The paper discusses challenges related to design and education of the simplest integrating controllers for systems with the dominant first order plants and possible long dead time that obviously represent the most frequently treated control task. Based on experience achieved in research and education of the course "Constrained PID control" Huba and Šimunek (2007), three different approaches comprising the traditional PI control, the IMC approach and the newly developed disturbance observer (DO) based PI control are compared from different points of view. By designing and experimentally evaluating controllers for simple plants, students are encouraged to experience pros and cons of particular approaches. In this way, the modular design of constrained DO based PI control with different filtering properties based on deeper analysis of the core structure of the P controller with different types of nonmodelled dynamics approximations is shown as the most exible and simultaneously sufficiently open and general alternative for stable, integral and unstable systems with possible long delays. © 2012 IFAC.

关键词： controllers

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Linear state-feedback control synthesis of tumor growth control in antiangiogenic therapy

Linear state-feedback control synthesis of tumor growth cont...

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10th IEEE Jubilee International symposium on Applied Machine Intelligence and Informatics, SAMI 2012

作者： Sápi, Johanna Drexler, Dániel A. Harmati, István Sápi, Zoltán Kovács, Levente Department of Control Engineering and Information Technology Budapest University of Technology and Economics Budapest Hungary 1st Department of Pathology and Experimental Cancer Research Semmelweis University Budapest Hungary

ISBN: (纸本)9781457701979

Cancer diseases are one of the most lethal, incurable diseases today, thus fighting cancer is an actual and urgent problem in clinical practice. Beside classical therapies, a new approach is represented by model-based therapies, where human body works as a complex system. These therapies are called targeted molecular therapies (TMTs). TMTs are fighting specifically against different cancer mechanisms and usually don't eliminate the whole tumor, but control the tumor into a given state and keep it there. The aim of antiangiogenic cancer therapy is to prevent tumors from forming new blood vessels, because without angiogenesis tumor growth is inhibited. In this paper we analyze a nonlinear tumor growth model and design linear controllers based on a linear model acquired from working point linearization. Realized controllers are state feedback with pole placement, LQ control method and both controllers with state observer. Simulations are carried out and the controllers are analyzed in many aspects, including the working points used at linearization. © 2012 IEEE.

关键词： Tumors

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Unknown input observer with Fuzzy Fault Tolerant control for wind Energy System

Unknown input observer with Fuzzy Fault Tolerant Control for...

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8th IFAC symposium on Fault Detection, Supervision and Safety of Technical Processes, SAFEPROCESS 2012

作者： Kamal, E. Aitouche, A. Ghorbani, R. Bayart, M. LAGIS FRE CNRS 3033 Lille University Nord France France Polytech-Lille Rue Paul Langevin 59655 Villeneuve d'Ascq France HEI 13 rue de Toul 59046 Lille Cedex France Mechanical Engineering University of Hawaii Manoa Holmes Hall 201 2540 Dole St. Honolulu HI United States

ISBN: (纸本)9783902823090

This paper proposes a Fuzzy Dedicated observers (FDOS) method using a nonlinear Unknown Input Fuzzy observer (UIFO) with a Fuzzy Fault Tolerant control (FFTC) algorithm for fuzzy Takagi-Sugeno (TS) systems subject to sensor faults. FDOS provide residuals for detection and isolation of sensor faults which can affect a TS model. Parallel Distributed Compensation (PDC) is employed to design the fuzzy Fault Tolerant controller from a TS fuzzy model. Sufficient stabilization conditions of the FFTC systems are given, which are formulated in terms of Linear Matrix Inequalities (LMIs). The LMIs can be efficiently solved using convex optimization techniques. Based on the derivation and simulation of the proposed FFTC approach, the stability of the closed-loop system in the event of sensor failures and unknown inputs is guaranteed. A wind Energy System (WES) with a Doubly-Fed Induction Generator (DFIG) example is illustrated to show the effectiveness of the proposed design method. © 2012 IFAC.

关键词： Linear matrix inequalities

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Fault tolerant adaptive sliding mode controller for wind turbine power maximisation

Fault tolerant adaptive sliding mode controller for wind tur...

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7th IFAC symposium on Robust control design, ROCOND'12

作者： Sami, Montadher Patton, Ron J. Department of Engineering University of Hull Hull HU6 7RX United Kingdom

ISBN: (纸本)9783902823038

This paper presents a new approach to robust fault tolerant control (FTC) to optimise the wind energy captured by a wind turbine in the low wind speed range of operation, using Sliding Mode control (SMC). In addition to the inherent robustness of SMC against matched model parameter uncertainty, the proposed method can first tolerate generator speed sensor faults and generator torque bias faults. Secondly, the need for a state observer can be removed by using the SMC robustness property and by adapting its switching gain so that the unmeasurable signals are compensated. The sliding surface is designed to achieve the required objectives by utilizing the nonlinear equation of the flexible two mass model of variable speed wind turbine. The proposed FTC SMC method is applied to a 4.8MW wind turbine benchmark model and the results are compared with equivalent results obtained from a "standard controller" (SC). © 2012 IFAC.

关键词： Sliding mode control

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