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control Performance Analysis of Feedforward and Maximum Peak Power Tracking for Small-and Medium-Sized Fixed Pitch Wind Turbines

Control Performance Analysis of Feedforward and Maximum Peak...

引用

international conference on control, automation, robotics and vision (ICARCV)

作者： B. Neammanee S. Sirisumranukul S. Chatratana King Mongkut''s Institute of Technology North Bangkok Bangkok Thailand

As the wind has become one of the fastest growing renewable energy sources, the key issue of wind energy conversion systems is how to efficiently operate the wind turbines in a wide range of wind speeds. In this paper where small- and medium-sized fixed pitch wind turbines are focused, a control performance analysis of the feedforward and maximum peak power tracking (MPPT) to maximize the power of the turbines while operating in their below rated power and to limit the power while operating in their above rated power is presented. the algorithms were implemented on a low cost digital signal controller (DSC) board and tested with a developed real-time wind turbine simulator, consisting of an induction motor driven by a torque control inverter, and computer interface for data acquisition. the experimental results show that the feedforward performs more satisfactorily when compared to the MPPT and has better performance indices in overall operating conditions. However, the feedforward causes power oscillation in the above rated power and needs wind turbine parameters as a control reference, but those parameters are not necessary in the MPPT, which exhibits an attractive feature

关键词： Performance analysis Wind turbines Torque control Renewable energy resources Wind energy Wind speed Costs Digital control Testing Computational modeling

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Dynamic vision in the Dynamic Scene: An Algebraic Approach

Dynamic Vision in the Dynamic Scene: An Algebraic Approach

引用

international conference on control, automation, robotics and vision (ICARCV)

作者： Jianchao Yao Signal Processing Laboratory DSO National Laboratories Singapore

In this paper, we address the issue of dynamically recovering 3D position vectors of a moving target based on its images in three views under the following scenario: (1) dynamic vision in dynamic scene, meaning that both camera and target are in motion; (2) the distance between target and camera is extremely large, so that we have only one image observation of the moving target for each view, the recovery of relative motion of target with respect to camera is impossible. By imposing the kinematical and dynamic constraints on the motion of target, its future position and velocity, given previous ones can be described by what we call f and g function. By combining with motion of the platform, the slant range for the middle time (or middle view) can be estimated by solving an eight-order polynomial. Since the three position vectors corresponding to the three image points on the three views can be assumed to lie in a single plane (approximate true if interval of the consecutive frames is small, and absolutely true if we consider the target to be a satellite moving on its orbit), the other two position vectors can be further derived. Initial experimental results demonstrated the correctness of the developed algorithm

关键词： Layout Cameras Motion estimation Position measurement Signal processing algorithms Laboratories Satellites Extraterrestrial measurements Motion measurement Image sensors

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Enhancement of Short-Span Seeking in a Dual-Stage Seek-Track Following control Using Variable Saturation

Enhancement of Short-Span Seeking in a Dual-Stage Seek-Track...

引用

international conference on control, automation, robotics and vision (ICARCV)

作者： Branislav Hredzak Guido Herrmann Chunling Du Data Storage Institute (DSI) Agency for Science Technology and Research Singapore University of Leicester Leicester UK

Servo actuators used in hard disk drives have to be able to move from one track to another track as fast as possible in order to enable fast access to the data. this paper improves short-span seeking performance of a proposed compensator based control system for a dual-stage servo actuator. Short-span seeking performance is improved by replacing a constant saturation non-linearity in the secondary loop of the dual-stage control system by a variable saturation non-linearity. the variable saturation ensures secondary actuator signal boundedness and at the same time modulates the control error to be fed into the secondary control loop. this results in a significantly faster response of the secondary actuator and hence faster seeking times. the improvement in seeking times is most significant for short range seeks that are within the range of the secondary actuator. Both simulation and experimental results comparing the performance of a dual-stage servo actuator with constant and with variable saturation in the secondary loop are presented. the use of a variable saturation shows significant improvement in short-span seeking performance

关键词： Servomechanisms Piezoelectric actuators Target tracking control systems Hard disks Error correction Magnetic heads Memory Microactuators Saturation magnetization

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Active Vibration Suppression of Beams with Discrete Actuators Using Optimal Dynamic Inversion

Active Vibration Suppression of Beams with Discrete Actuator...

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international conference on control, automation, robotics and vision (ICARCV)

作者： Sk Faruque Ali Radhakant Padhi Research Scholar Department of Civil Engineering Indian Institute of Science Bangalore India Asst. Professor Department of Aerospace Engineering Indian Institute of Science Bangalore India

Most of the structural elements like beams, cables etc. are flexible and should be modeled as distributed parameter systems (DPS) to represent the reality better. For large structures, the usual approach of 'modal representation' is not an accurate representation. Moreover, for excessive vibrations (possibly due to strong wind, earthquake etc.), external power source (controller) is needed to suppress it, as the natural damping of these structures is usually small. In this paper, we propose to use a recently developed optimal dynamic inversion technique to design a set of discrete controllers for this purpose. We assume that the control force to the structure is applied through finite number of actuators, which are located at predefined locations in the spatial domain. the method used in this paper determines control forces directly from the partial differential equation (PDE) model of the system. the formulation has better practical significance, both because it leads to a closed form solution of the controller (hence avoids computational issues) as well as because a set of discrete actuators along the spatial domain can be implemented with relative ease (as compared to a continuous actuator)

关键词： Actuators Force control Cables Power system modeling Distributed parameter systems Vibration control Earthquakes Damping Optimal control Partial differential equations

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Robust Asymptotic control for Intelligent Unknown Mechatronic Systems

Robust Asymptotic Control for Intelligent Unknown Mechatroni...

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international conference on control, automation, robotics and vision (ICARCV)

作者： Michel Cotsaftis LASCS ECE Paris France

In order to fulfil ever increasing performances in industry, man made systems are becoming very complex and are requiring to solve the following paradox. Whereas with growing complexity the uncertainty on the system and its environment increases, at the same time much better preciseness in dynamical behaviour is demanded for system operation. As the environment is not rigidly fixed, it becomes mandatory to adapt intelligently to its change. Mathematically, this implies to satisfy conditions for robust asymptotic stability. Classical mechanistic trajectory based approach is no longer valid and a new approach based on more global functional manifold is proposed here which ends up on explicit criteria guaranteeing the property. Two cases are occurring. If system uncertainty ball is smaller than affordable robustness ball, the criterion can be worked out within equivalence class which is completely defined from system equations. If system uncertainty ball is larger, a more sophisticated but still explicit method is indicated which adjusts system representation parameters so that they converge toward reliable system dynamical approximation so that robust asymptotic stability property still holds. As such, system dynamics are securely managed at execution level, preparing the system for including next level of decision and freeing operator action to concentrate on supervision

关键词： Robust control control systems Intelligent systems Intelligent control Mechatronics Uncertainty Robust stability Asymptotic stability Electrical equipment industry Mechanical factors

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A Geometric Active Contour Framework using Multi-Cue and Local Feature

A Geometric Active Contour Framework using Multi-Cue and Loc...

引用

international conference on Pattern Recognition

作者： Zhenglong Li Qingshan Liu Hanqing Lu National Laboratory of Pattern Recognition Institute of Automation Chinese Academy and Sciences Beijing China

ISBN: (纸本)0769525210

there exist two key issues in the traditional geometric active contour (GAC): only single cue based driven force and edge leakage. In this paper, we propose two new GACs, i.e., multi-Cue based GAC (MC-GAC) and local-feature based GAC (LF-GAC), to deal with these two problems respectively. In MC-GAC, a multi-cue based force is generated by introducing the customized vector flow into the model. To utilize local feature information, LF-GAC is developed, in which local edge information is considered to produce continuous edge. Further, we unify these two GACs into a novel general GAC framework. Extensive experiments showed the advantages of the proposed method

关键词： Active contours Equations Pattern recognition Computer vision Level set Laboratories automation Motion estimation Tracking Bidirectional control

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Study of Grey Rough Set Model Based on Tolerance Relation

Study of Grey Rough Set Model Based on Tolerance Relation

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international conference on control, automation, robotics and vision (ICARCV)

作者： S.X. Wu S.H. Shi S.F. Liu M.Q. Li School of Economics and Management Nanjing University of Aeronautics and Astronautics Nanjing China Center for Systems and Control Xiamen University Xiamen Fujian China Department of Electrical & Computer Engineering National University of Singapore Singapore Department of Computer Shenzhen Polytechnic Shenzhen Guangdong China

this paper analyses several extended rough set models in incomplete information systems and proposes a tolerance relation based model of processing grey incomplete information systems, which is an extension to rough set models. the method of the model is: firstly partitioning the original incomplete information system by introduced threshold value, then establishing tolerance classes through grey tolerance relation and obtaining upper and lower approximations through these tolerance classes. Moreover, a method of whitening grey numbers based on grey tolerance relation is given. this paper shows that the model accords with practice according to examples and the algorithm of whitening grey numbers is also comparatively ideal. the more important point is that the subjective needs are considered during partitioning grey tolerance classes by introducing threshold value. So it is consistent with the system methodology of person-oriented person-to-machine communication

关键词： Information systems Set theory control systems Rough sets Concurrent computing Engineering management Stress control Null value Humans Information analysis

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Kinematic Modeling and Dynamic Analysis of the Long-based Undulation Fin

Kinematic Modeling and Dynamic Analysis of the Long-based Un...

引用

international conference on control, automation, robotics and vision (ICARCV)

作者： Guangming Wang Lincheng Shen Tianjiang Hu Institute of Automation National University of Defense Technology Changsha China

Within median and/or paired fin (MPF) propulsion, many fish routinely use the long-based undulatory fins as the sole means of locomotion. In this paper, the long-based undulatory fin of an Amiiform fish "G. niloticus" was investigated. A simplified physical model was brought forward, which makes up of N equal thin rods and a rectangular elasticmembrane connecting them together. With light mass, small stiffness and low natural vibration frequency, the long-based fin undulating and fluid loading may induce large flexible distortion of their long-based fins when swimming. We established a kinematic model of the long-based undulatory fin on the basis of analyzing the long-based dorsal fin locomotion and considering the fluid-structure interaction. Further, the equilibrium equations of the undulatory fin were obtained by applying the membrane theory of thin shells in which the geometrical non-linearity of the structure is taken into account. Last, we apply the derived the kinematic model and equilibrium equations of the undulatory fin to analyze the thrust and propulsive efficiency varying with the aspect ratio of the fin and the maximum swing amplitude

关键词： Kinematics Marine animals Propulsion Biomembranes Vehicle dynamics Joining processes Frequency Nonlinear equations Underwater vehicles Remotely operated vehicles

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第9届控制、自动化、机器人学和视觉国际会议(ICARV'2006)

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自动化学报 2006年第1期32卷 Ⅱ-Ⅱ页

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Optimal Deployment control for a Heterogeneous Mobile Sensor Network

Optimal Deployment Control for a Heterogeneous Mobile Sensor...

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international conference on control, automation, robotics and vision (ICARCV)

作者： Mahbub Gani Department of Electronic Engineering King''s College London UK

this paper proposes a hierarchical architecture for a heterogeneous sensor network consisting of both mobile and fixed agents. the hierarchy contains three layers. the lowest level, Layer 0, is the sensing layer and consists of fixed sensors deployed in an environment of interest according to a spatial Poisson distribution of intensity measure A. Layer 1, the next level in the hierarchy, is the aggregation layer and involves mobile agents (e.g., autonomous vehicles) gathering the sensed data from the Layer 0 nodes based on a nearest neighbour rule. the highest level of the hierarchy is the query layer, which represents requests for the data gathered by the sensors to be transmitted, via the Layer 1 agents, to a mobile base station (e.g., a flying aircraft periodically visiting the area of interest). We construct for this network a utility function which basically captures the cost associated with communication, as seen from the point of view of the mobile agents of Layer 1. Based on a gradient descent strategy we propose a motion coordination scheme to maneuver the mobile nodes from an arbitrary initial arrangement to one that minimizes the utility function. the application of the proposed algorithm in an elementary settings is illustrated via numerical simulations

关键词： Optimal control Mobile communication Sensor phenomena and characterization Mobile agents Mobile robots Remotely operated vehicles Aircraft Cost function Robustness Educational institutions

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