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A wind farm controller for load and power optimization in a farm

A wind farm controller for load and power optimization in a ...

引用

IEEE International Symposium on Computer Aided control System Design (CACSD)

作者： Maryam Soleimanzadeh Arno J. Brand Rafael Wisniewski Automation and Control Section Electronic System Department Aalborg University Denmark Energy Research Center of Netherlands Netherlands

This paper describes the design procedure of an optimal wind farm controller. The controller optimizes the structural load and power production simultaneously, on the basis of an analytical wind farm model. The farm model delivers maps of wind, loads and energy in the wind farm. Moreover, the model computes the wind speed at the turbines, turbine bending moments and aerodynamic power and torque. The optimal control problem is formulated based on the model for two different wind directions. The controller determines the reference signals for each individual wind turbine controller in two scenarios based on low and high wind speed. In low wind speed, the reference signals for rotor speed are adjusted, taking the trade-off between power maximization and load minimization into account. In high wind speed, the power and pitch angle reference signals are determined while structural loads are minimized.

关键词： Wind turbines Wind speed Wind farms Rotors Poles and towers Blades Aerodynamics

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Time-Weighted Balanced Stochastic Model Reduction

Time-Weighted Balanced Stochastic Model Reduction

引用

IEEE Conference on Decision and control

作者： Maryamsadat Tahavori Hamid Reza Shaker Section for Automation and Control Department of Electronic systems Aalborg University Denmark Department of Energy Technology Aalborg University Denmark

ISBN: (纸本)9781612848006

A new relative error model reduction technique for linear time invariant (LTI) systems is proposed in this paper. Both continuous and discrete time systems can be reduced within this framework. The proposed model reduction method is mainly based upon time-weighted balanced truncation and a recently developed inner-outer factorization technique. Compared to the other analogous counterparts, the proposed method shows to provide more accurate results in terms of time weighted norms, when applied to different practical examples. The results are further illustrated by a numerical example.

关键词： Reduced order systems Stochastic processes Numerical stability Observability Stability analysis controllability Mathematical model

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control Reconfigurability of Bilinear Hydraulic Drive Systems

Control Reconfigurability of Bilinear Hydraulic Drive System...

引用

2011 International Conference on Fluid Power and Mechatronics

作者： Hamid Reza Shaker Maryamsadat Tahavori Department of Energy Technology Aalborg University Aalborg Denmark Section for Automation and Control Department of Electronic SystemsAalborg University AalborgDenmark

The objective of the methods within the framework of the plug and play process control and particularly fault tolerant control is to establish control techniques which guarantee a certain performance through control reconfiguration at the occurrence of the faults or *** methods cannot be effective if sufficient redundancy does not exist in the process. A measure for control reconfigurability which reveals the level of redundancy in connection with feedback control is proposed in this paper for bilinear *** proposed control reconfigurability measure is the extension of its gramian-based analogous counterpart,which has been previously proposed for the linear *** control reconfigurability is calculated for the bilinear models of an electro-hydraulic drive to show its relevance to redundant actuating capabilities in the models.

关键词： bilinear systems,control reconfigurability,fault- tolerant control,electro-hydraulic drives

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Structured control of Affine Linear Parameter Varying Systems

Structured Control of Affine Linear Parameter Varying System...

引用

American control Conference

作者： Fabiano Daher Adegas Jakob Stoustrup Automation and Control Section Department of Electronic Systems Aalborg University Fredrik Bajers Vej 7C 9220-DK Denmark

ISBN: (纸本)9781457700811;9781457700804

This paper presents a new procedure to design structured controllers for discrete-time affine linear parameter-varying systems (A-LPV). The class of control structures includes decentralized of any order, fixed-order output feedback, simultaneous plant-control design, among others. A parameter-varying non-convex condition for an upper bound on the induced L_(2)-norm performance is solved by an iterative linear matrix inequalities (LMI) optimization algorithm. Numerical examples demostrate the effectiveness of the proposed approach.

关键词： linear parameter varying system control Architecture In-law Affine controller structure

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Wind deficit model in a wind farm using finite volume method

Wind deficit model in a wind farm using finite volume method

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作者： Soleimanzadeh, Maryam Wisniewski, Rafael Shakeri, S. Mojtaba Automation and Control Section Electronic System Dept. Aalborg University Denmark

ISBN: (纸本)9781424474264

A wind deficit model for wind farms is developed in this work using finite volume method. The main question addressed here is to calculate approximately the wind speed in the vicinity of each wind turbine of a farm. The procedure followed is to solve the governing equations of flow for the whole wind farm. Spatial discretization is performed on a computational domain, using finite volume techniques. In ideal circumstances, wind speed will calculate on a fine mesh for the whole wind farm, where the effect of wind turbines is observed by means of their thrust coefficient. The end goal of this method is to assist the development of an analytical expression of an offshore wind farm wake. We focus in this work on wind deficit that can be used for better wind farm control strategies and load optimization. © 2010 AACC.

关键词： Finite volume method

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Aeolus toolbox for dynamics wind farm model, simulation and control

Aeolus toolbox for dynamics wind farm model, simulation and ...

引用

European Wind Energy Conference and Exhibition 2010, EWEC 2010

作者： Grunnet, Jacob D. Soltani, Mohsen Knudsen, Torben Kragelund, Martin Bak, Thomas Section for Automation and Control Aalborg University Frederik Bajers Vej 7C 9220 Aalborg Denmark

ISBN: (纸本)9781617823107

This paper presents the wind farm simulation model developed in the EU-FP7 project, AEOLUS. The idea is to provide a publicly available simulation package for researchers developing farm level control solutions. With the software it is possible to auto generate a wind farm simulation model in Matlab/ Simulink based on turbine parameters and farm geometry. The input to the farm simulator is power set points of individual turbines. Outputs from the farm simulation are power production, nacelle wind speed and fatigue loads (damage equivalent loads) of each turbine.

关键词： Turbines

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Robust Helicopter Stabilization in the Face of Wind Disturbance

Robust Helicopter Stabilization in the Face of Wind Disturba...

引用

2010 49th IEEE Conference on Decision and control

作者： Kumeresan A. Danapalasingam John-Josef Leth Anders la Cour-Harbo Morten Bisgaard Section for Automation & Control Department of Electronic Systems Aalborg University Denmark

ISBN: (纸本)9781424477456

When a helicopter is required to hover with minimum deviations from a desired position without measurements of a persistent wind disturbance, a robustly stabilizing control action is vital. In this paper, the stabilization of the position and translational velocity of a nonlinear helicopter model affected by a wind disturbance is addressed. The wind disturbance is assumed to be a sum of a fixed number of sinusoids with unknown amplitudes, frequencies and phases. An estimate of the disturbance is introduced to be adapted using state measurements for control purposes. A nonlinear controller is then designed based on nonlinear adaptive output regulation and robust stabilization of a chain of integrators by a saturated feedback. Simulation results show the effectiveness of the control design in the stabilization of helicopter motion and the built-in robustness of the controller in handling parameter and model uncertainties.

关键词： disturbance design control Wind Hovering Output Regulation control action model uncertainty integrators controllers

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Stability analysis for class of switched nonlinear systems

Stability analysis for class of switched nonlinear systems

引用

作者： Shaker, Hamid Reza How, Jonathan P. Department of Aeronautics and Astronautics Aerospace Controls Laboratory Massachusetts Institute of Technology Cambridge MA United States Department of Electronic Systems Section of Automation and Control Aalborg University United States

ISBN: (纸本)9781424474264

Stability analysis for a class of switched nonlinear systems is addressed in this paper. Two linear matrix inequality (LMI) based sufficient conditions for asymptotic stability are proposed for switched nonlinear systems. These conditions are analogous counterparts for switched linear systems which are shown to be easily verifiable and suitable for design problems. The results are illustrated by numerical examples. © 2010 AACC.

关键词： Asymptotic stability

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A robust stabilization using state feedback with feedforward

A robust stabilization using state feedback with feedforward

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作者： Danapalasingam, Kumeresan A. La Cour-Harbo, Anders Chowdhary, Girish Bisgaard, Morten Department of Electronic Systems Section for Automation and Control Aalborg University 9220 Aalborg Denmark Georgia Institute of Technology Daniel Guggenheim School of Aerospace Engineering Atlanta GA United States

ISBN: (纸本)9781424474264

In a general nonlinear control system a stabilizing control strategy is often possible if complete information on external inputs affecting the system is available. Assuming that measurements of persistent disturbances are available it is shown that the existence of a smooth uniform control Lyapunov function implies the existence of a stabilizing state feedback with feedforward control which is robust with respect to measurement errors and external disturbances. Conversely, using differential inclusions parameterized as nonlinear systems with state and disturbance measurement errors, it is shown that there exists a smooth uniform control Lyapunov function if there is a robustly stabilizing state feedback with feedforward. This paper demonstrates that if there exists a smooth control Lyapunov function for a general nonlinear system with persistent disturbances for which one has previously designed a feedback controller, a feedforward always exists to be augmented for stability. © 2010 AACC.

关键词： Lyapunov functions

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Nonlinear feedforward control for wind disturbance rejection on autonomous helicopter

Nonlinear feedforward control for wind disturbance rejection...

引用

2010 IEEE/RSJ International Conference on Intelligent Robots and Systems

作者： Morten Bisgaard Anders la Cour-Harbo Kumeresan A. Danapalasingam Department of Electronic Systems Section of Automation and Control University of Aalborg Aalborg Denmark

This paper presents the design and verification of a model based nonlinear feedforward controller for vertical and horizontal wind disturbance rejection on autonomous helicopters. The feedforward control is based on a helicopter model that is derived using a number of carefully chosen simplifications to make it suitable for the purpose. The model is inverted for the calculation of rotor collective and cyclic pitch angles given the wind disturbance. The control strategy is then applied on a small helicopter in a controlled wind environment and the effectiveness and advantage of the feedforward controller is demonstrated through flight tests.

关键词： Helicopters Feedforward neural networks Blades Mathematical model Rotors Equations Force

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