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19th IFAC World Congress on International Federation of automatic control, IFAC 2014

作者： Juuso, Esko K. Yebra, Luis J. Control Engineering Laboratory Department of Process and Environmental Engineering University of Oulu FI-90014 Finland CIEMAT Plataforma Solar de Almería Automatic Control Group Crta. de Seńes s/n Tabernas Almería04200 Spain

ISBN: (纸本)9783902823625

Solar power plants collect available thermal energy in a usable form at the desired temperature range. Efficient operation requires a fast start-up and reliable operation in varying cloudy conditions without unnecessary shutdowns and start-ups. Fast and well damped linguistic equation (LE) controllers have been tested in Spain at a collector field, which uses parabolic-trough collectors to supply thermal energy in form of hot oil to an electricity generation system or a multi-effect desalination plant. control is achieved by means of varying the flow pumped through the pipes in the field during the operation. The nights and the heavy cloud periods need to come up with the storage. The smart LE controllers extend the operation to varying cloudy conditions and handle efficiently disturbances in energy demand. The predefined model-based adaptation techniques are combined with special features when needed. The intelligent state indicators react well to the changing operating conditions and can be used in smart working point control to further improve the operation in connection with the other energy sources. The controller reacts efficiently on the setpoint changes, clouds and load disturbances. The predictive braking action allows fast changes in control actions. The setpoint is achieved accurately with the new asymmetrical action. The working point can be chosen in a way which improves the efficiency of the energy collection. © IFAC.

关键词： controllers

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Separable model predictive control via alternating direction method of multipliers for large-scale systems 19

Separable model predictive control via alternating direction...

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19th IFAC World Congress on International Federation of automatic control, IFAC 2014

作者： Lu, Liang Division of Automatic Control Department of Electrical Engineering Linköping University LinköpingSE-581 83 Sweden State Key Laboratory of Synthetical Automation for Process Industries Northeastern University Shenyang China

ISBN: (纸本)9783902823625

In this paper, an alternating direction method of multipliers (ADMM) based realtime model predictive control (MPC) algorithm is presented. With the use of indicator function and by introducing extra consensus constraints, the constrained MPC problem can be formulated as a separable MPC problem, which can be computed very efficiently by projected gradient descent ADMM update steps and Riccati recursions. The sequence of the objective value of this constrained real-time ADMM-type MPC algorithm satisfies a linear convergence rate. The procedure is also extended to distributed systems with constraints, in which the variables of each subsystems communicate with their neighbors and update in the Gauss-Seidel way. An illustrative example shows the effectiveness of this approach. © IFAC.

关键词： Model predictive control

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Backstepping Observers for Periodic Quasi-Linear Parabolic PDEs

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IFAC Proceedings Volumes 2014年第3期47卷 7761-7766页

作者： L. Jadachowski T. Meurer A. Kugi Christian Doppler Laboratory for Model-Based Process Control in the Steel Industry Automation and Control Institute Vienna University of Technology Austria Chair of Automatic Control Christian-Albrechts-University Kiel Germany

The extension of the backstepping-based state observer design is considered for general periodic quasi-linear parabolic PDEs in one space dimension. Here, the extended linearization combined with a suitable coordinate and state transformation is employed. This allows for the application of the backstepping method for the determination of an extended Luenberger observer with observer gains entering the PDE and the boundary condition which ensures an exponential decay of the linearized observer error dynamics. This is confirmed analytically, while the convergence of the quasi-linear observer error system is studied in numerical simulations.

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Moving horizon H8 control of variable speed wind turbines with actuator saturation

Moving horizon H8 control of variable speed wind turbines wi...

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作者： Ma, Miaomiao Chen, Hong Liu, Xiangjie Allgöwer, Frank Beijing Key Laboratory of New Technology and System on Measuring and Control for Industrial Process North China Electric Power University No. 2 Beinong Road Huilongguan Changping District Beijing 102206 China Institute for Systems Theory and Automatic Control University of Stuttgart Pfaffenwaldring 9 Stuttgart 70550 Germany Department of Control Science and Engineering Jilin University Campus NanLing Renmin Strasse 5988 Changchun 130025 China

This study suggests a moving horizon H8 control scheme for variable speed wind turbines above the rated wind speed to maintain the output power at the rated value for variable operating points. A constrainedH8 control problem is solved at each sampling time with the update of not only the initial condition but also the prediction model based on different operating points. Closed-loop properties inclusive of L2 disturbance attenuation are discussed in the framework of dissipation theory. The moving horizon H8 control considers the non-linear dynamic aspect of the wind turbine, the turbulent nature of the wind and actuator saturations. Analysis and simulation results for WD34 wind turbine show possible improvements on the output electrical power regulation performance for variable operating points, while respecting actuator saturation limits. © The Institution of Engineering and Technology 2014.

关键词： Wind turbines

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Fault estimation for a class of discrete-time nonlinear systems 19

Fault estimation for a class of discrete-time nonlinear syst...

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19th IFAC World Congress on International Federation of automatic control, IFAC 2014

作者： Wang, Z. Rodrigues, M. Theilliol, D. Shen, Y. School of Astronautics Harbin Institute of Technology Harbin150001 China Automatic and Process Control Laboratory University of Lyon LyonF-69003 France Centre de Recherche en Automatique de Nancy Université de Lorraine CNRS UMR 7039 Vandoeuvre-les-NancyF-54506 France

ISBN: (纸本)9783902823625

This paper deals with actuator fault estimation for a class of discrete-time nonlinear systems whose linear part is described by a Linear Parameter-Varying (LPV) form and nonlinear term is Lipschitz. In this paper, an augmented system is constructed by considering the fault as an auxiliary state vector. Then, a robust fault estimation observer is designed based on the augmented system. The proposed fault estimation observer is able to attenuate the effect of the fault variation and measurement noise and the observer design is formulated as a Linear Matrix Inequality (LMI) feasibility problem, which can be easily solved. Finally, a missile model is used to demonstrate the effectiveness of the proposed method. © IFAC.

关键词： Parameter estimation

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Smart adaptive control of a solar collector field

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IFAC Proceedings Volumes 2014年第3期47卷 2564-2569页

作者： Esko K. Juuso Luis J. Yebra Control Engineering Laboratory Department of Process and Environmental Engineering FI-90014 University of Oulu Finland CIEMAT Plataforma Solar de Almería Automatic Control Group Crta. de Senés s/n 04200 Tabernas Almería Spain

关键词： Solar energy intelligent control nonlinear systems adaptation optimisation linguistic equations modelling simulation

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Separable Model Predictive control via Alternating Direction Method of Multipliers for Large-scale Systems

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IFAC Proceedings Volumes 2014年第3期47卷 10499-10504页

作者： Liang Lu Division of Automatic Control Department of Electrical Engineering Linköping University SE-581 83 Linköping Sweden State Key Laboratory of Synthetical Automation for Process Industries Northeastern University Shenyang China

In this paper, an alternating direction method of multipliers (ADMM) based real-time model predictive control (MPC) algorithm is presented. With the use of indicator function and by introducing extra consensus constraints, the constrained MPC problem can be formulated as a separable MPC problem, which can be computed very efficiently by projected gradient descent ADMM update steps and Riccati recursions. The sequence of the objective value of this constrained real-time ADMM-type MPC algorithm satisfies a linear convergence rate. The procedure is also extended to distributed systems with constraints, in which the variables of each subsystems communicate with their neighbors and update in the Gauss-Seidel way. An illustrative example shows the effectiveness of this approach.

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Sensor Fault Estimation Filter Design for Discrete-time Linear Time-varying Systems

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自动化学报 2014年第10期40卷 2364-2369页

作者： WANG Zhen-Hua RODPIGUES Mickaelt THEILLIOL Didier SHEN Yi School of Astronautics Harbin Institute of Technology Automatic and Process Control Laboratory Uni-versity of Lyon Universit′e Lyon 1 CNRSUMR 5007 Villeurbanne F-69622 France Centre de Rechercheen Automatique de Nancy Universit′e de Lorraine CNRS UMR 7039F-54506 Vandoeuvre-les-Nancy France

This paper proposes a sensor fault diagnosis method for a class of discrete-time linear time-varying (LTV) systems. In this paper, the considered system is firstly formulated as a descriptor system representation by considering the sensor faults as auxiliary state variables. Based on the descriptor system model, a fault estimation filter which can simultaneously estimate the state and the sensor fault magnitudes is designed via a minimum-variance principle. Then, a fault diagnosis scheme is presented by using a bank of the proposed fault estimation filters. The novelty of this paper lies in developing a sensor fault diagnosis method for discrete LTV systems without any assumption on the dynamic of fault. Another advantage of the proposed method is its ability to detect, isolate and estimate sensor faults in the presence of process noise and measurement noise. Simulation results are given to illustrate the effectiveness of the proposed method.

关键词：线性时变系统传感器故障滤波器设计故障估计离散时间故障诊断方法状态变量原理设计

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Direct torque control of the DFIG and direct power control for grid side converter in a wind power generation system

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Mediterranean Journal of Measurement and control 2013年第3期9卷 101-108页

作者： Abdelhafidh, Moualdia Oulhadj, Mahmoudi Mohand Lazhari, Nezli Laboratory Research in Electrical and Automatic Medea University Algiers 26000 Algeria Ecole Nationale Polytechnique Laboratory Process Control Algiers 16000 Algeria

This paper proposes two techniques to control DTC (Direct Torque control) and DPC (Direct Power control), applied to the system of converting wind energy with a double-fed asynchronous machine. Conventionally, the DTC is developed from the expressions of the model of DFIG in the reference connected to the rotor, so the amplitude of the flux is estimated from the voltages and currents of the rotor. The reference torque is obtained by a mechanical speed controller of the machine whose goal is to have a maximum power point tracking (MPPT). On the other hand, the DPC is achieved while using a new switching table without sensor voltage. The instantaneous active and reactive power is controlled directly by selecting the optimum condition of the network side converter. The main objective of the control system and maintain the DC bus voltage level required. Consequently, the input currents from the network should be sinusoidal and in phase with the voltages to meet operating at unity power factor. The results obtained show the interest of both techniques. Copyright © 2013 SoftMotor Ltd.

关键词： Wind power

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Improved direct torque control of induction motors using adaptive observer and sliding mode control

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Archives of control Sciences 2013年第3期23卷 361-376页

作者： Kouchih, Djilali Tadjine, Mohamed Boucherit, Mohamed Seghir Electronic Department University Saad Dahlab B.P. 270 Blida Algeria Process Control Laboratory Automatic Control Department ENP 10 Avenue Badi H. Alger Algeria

This paper presents the synthesis of an adaptive observer which is used for the improvement of the direct torque control of induction motor drives. The observer detects stator flux components in two-phase stationary reference frame, rotor speed and stator resistance by measure of the stator terminal voltages and currents. The observer is adapted using a simple algorithm which does not imply a high computational load. Stability analysis based on Lyapunov theory is performed in order to guarantee the closed loop stability. Simulation tests under load disturbance and stator resistance variation are provided to evaluate the consistency and performance of the proposed control technique in the low and high speeds.

关键词： Induction motors

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