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检索条件"主题词=computer algorithms"

共 3297 条记录，以下是1031-1040 订阅

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Continuous Higher Order Sliding Mode Control with Impulsive Action

Continuous Higher Order Sliding Mode Control with Impulsive ...

引用

IEEE Annual Conference on Decision and Control

作者： Fathi M. Aldukali Yuri B. Shtessel Electrical and Computer Engineering Department University of Alabama in Huntsville Hunsville AL 35899 USA

ISBN: (纸本)9781479978878

A perturbed system with input-output dynamics of arbitrary and well defined relative degree is considered. The almost instantaneous convergence to the origin is achieved via impulsive control acting in a concert with continuous HOSM controller. The impulsive actions are implemented in a piecewise constant format. The efficacy of the proposed control algorithm is verified via simulations.

关键词： higher order sliding mode control impulsive control Variable structure systems Impulsiveness computer algorithms higher-order Arbitrary

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Hierarchical Control Approach for Microgrid Load Sharing with Renewable Energy Sources

Hierarchical Control Approach for Microgrid Load Sharing wit...

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IEEE Power and Energy Society General Meeting

作者： M. A. Barik H. R. Pota J. Ravishankar School of Engineering and Information Technology The University of New South Wales School of Electrical Engineering and Telecommunications The University of New South Wales

ISBN: (纸本)9781467380416

The aim of this paper is to develop a control algorithm for load sharing in an isolated microgrid with renewable energy sources (RESs) and storage devices. In this paper, a load sharing control scheme is proposed where a central power management unit and local controllers work together to share the load of a microgrid with its available generators. The central control unit is able to estimate the load deviations for each node centrally by using only the node voltages. This control scheme considers both resistive and inductive transmission lines and works well in a microgrid environment with RESs. Simulation results show that its load-sharing errors are negligible and all the node voltages are within the permissible limits.

关键词： Load sharing Microgrid Renewable generation load sharing MICRO-GRID Renewable energy renewable energy sources computer algorithms local controller storage devices stepping controls Permissible limits

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Wind Turbine Control Scheme based on Adaptive Sliding Mode Controller and Observer

Wind Turbine Control Scheme based on Adaptive Sliding Mode C...

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IEEE Conference on Emerging Technologies and Factory Automation

作者： Oscar Barambones Jose Maria Gonzalez de Durana Engineering School of Vitoria University of the Basque Country (UPV/EHU)

ISBN: (纸本)9781467379304

The efficiency of the wind power conversions systems can be greatly improved using an appropriate control algorithm. In this work, an adaptive robust control for a variable speed wind power generation is described. A robust aerodynamic torque observer is also designed in order to avoid the wind speed sensors. The proposed adaptive robust control law is based on a sliding mode control theory, that presents a good performance under system uncertainties. The stability analysis of the proposed controller under disturbances and parameter uncertainties is provided using the Lyapunov stability theory. Finally simulated results show, on the one hand that the proposed controller provides high-performance dynamic characteristics, and on the other hand that this scheme is robust with respect to plant parameter variations and external disturbances.

关键词： Adaptive robust control Variable structure systems Controllers system uncertainties fuzzy sliding mode controllers Variable speed external disturbance parameter uncertainty computer algorithms Sliding mode Observers Wind Energy Conversion Systems Stability analysis Scheme stability derivatives

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Stability of Modified Max Pressure Controller with Application to Signalized Traffic Networks

Stability of Modified Max Pressure Controller with Applicati...

引用

American Control Conference

作者： Thomas Pumir Leah Anderson Dimitrios Triantafyllos Alexandre M. Bayen Department of Electrical Engineering and Information Technology Chemnitz University of Technology Chemnitz Germany

ISBN: (纸本)9781479917730

This work describes a type of distributed feedback control algorithm that acts on a vertical queueing network where flow dynamics may greatly outpace the rate of feedback and actuation. The modeled network has a known, finite set of feasible actuations for the binary controllers located at each network node. It also has known expected demands, split ratios, and maximum service rates. Previous work proposed the application of a max pressure controller to maximize throughput on such a network without the need for centralized computation of a control policy. Here we extend the max pressure controller to satisfy practical constraints on the frequency of switching and guarantees on proportional actuation. We fundamentally alter the formulation of max pressure to a setting where the controller may only update at a rate significantly slower than the dynamics of queue formation. Furthermore, the set of allowable controllers is extended to any convex combination of available signal phases to account for signal changes within a single signal "cycle". We show that this proposed extended max pressure controllers stabilize a vertical queueing network (queue lengths remain bounded in expectation) given slightly increased restrictions on admissible network demand flows. This work is motivated by the application of controlling traffic signals on arterial road networks. Max pressure provides an intriguing alternative to existing feedback control systems due to its distributed implementation and theoretical guarantees, but cannot be directly applied as originally formulated due to hardware and safety constraints. We ultimately apply our extension of max pressure to a simulation of an existing arterial roadway and provide comparison to the control policy that is currently deployed on this site.

关键词： control strategy Controllers network node traffic network Feedback control systems single signal Queueing networks computer algorithms Network

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Design and Implementation of a Predictive Control Strategy for Power Management of a Wireless Sensor Network

Design and Implementation of a Predictive Control Strategy f...

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European Control Conference

作者： Olesia Mokrenko Maria Isabel Vergara-Gallego Warody Lombardi Suzanne Lesecq Diego Puschini Carolina Albea Univ. Grenoble Alpes CNRS LAAS

ISBN: (纸本)9781467371605

Technological advances have made wireless sensor nodes cheap and reliable enough to be brought into various application domains. The limited energy capacity of sensor nodes is the key factor that restricts their lifespan. In this paper, a Predictive Control strategy for Dynamic Power Management of a set of wireless sensor nodes is proposed. The control formulation is based on Model Predictive Control with constraints and binary optimization variables, leading to a Mixed Integer Quadratic Programming problem. The proposed control algorithm guarantees services and performances levels with a minimum number of active nodes and/or a minimum load on such components. The strategy is evaluated on a real test-bench with wireless sensor nodes equipped with batteries and harvesting systems. Experimental results show the effectiveness of the proposed control method.

关键词： Wireless sensor networks control strategy Predictive control minimum load Ganglia active nodes energy capacity Control Methods Sensors wireless computer algorithms Batteries Life span

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Closed-loop identification and tracking control of Lagrangian systems under input constraints

Closed-loop identification and tracking control of Lagrangia...

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IEEE Annual Conference on Decision and Control

作者： D. J. Lopez-Araujo Antonio Loria Laboratoire de Signaux et Systemes Supelec CNRS. Plateau de Moulon 91192 Gif sur Yvette France

ISBN: (纸本)9781479978878

In this paper global tracking and parameter convergence are proven for an adaptive control algorithm with independently saturated proportional and derivative terms through a persistency of excitation condition, while guaranteeing the inputs to never reach their natural saturation limit. As far as the authors are aware this is the first work that achieves globally the motion control objective and system identification, avoiding actuator saturation.

关键词： tracking control Lagrangian System identification computer algorithms Saturated Awareness Proportional

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Event-based GPC for multivariable processes

Event-based GPC for multivariable processes

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International Conference on Event-based Control, Communication, and Signal Processing (EBCCSP)

作者： A. Pawlowski J. L. Guzmán M. Berenguel J. E. Normey-Rico S. Dormido Department of Computer Sciences and Automatic Control UNED Madrid Spain Department of Informatics University of Almería Almería Spain Department of Systems and Automation UFSC Florianopolis Brazil

ISBN: (纸本)9781467378895

In this work, a practical event-based framework for multivariable processes is introduced. The developed control algorithm is based on a Generalized Predictive Control (GPC) algorithm suitable for MIMO systems. The most important advantage of the proposed control scheme is the adaptability of control actions to process disturbances and process interactions. Moreover, event-based approach allows prioritizing selected control variables, paying more attention to important variables (often related to security or costs) while neglecting non-critical ones. This is possible through adjusting the sensor deadband value, making feasible a tradeoff between control effort and control performance. Using this approach, it is possible to keep less relevant variables within the established limits, focusing the control system attention on those critical for process operation. The analyzed event-based control technique for multivariable systems is tested through a simulation study and considering an industrial stirred tank reactor process. The obtained results show several benefits regarding event-based control application, keeping all properties of event-based approach as well as model predictive control ones.

关键词： Event-Based GPC Multivariable Processes control actions Event-based multiple input multiple output systems control action computer algorithms GYPC gene Multivariable Control technology

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Patient Simulator Using Wearable Robot: Representation of Invariant Sitting-down and Standing-up Motions of Patients with Knee-OA

Patient Simulator Using Wearable Robot: Representation of In...

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Annual Conference of the IEEE Industrial Electronics Society

作者： Ryu Kubo Shogo Okamoto Shogo Nezaki Naomi Yamada Yasuhiro Akiyama Yoji Yamada Nagoya University

ISBN: (纸本)9781479917631

It is ethically problematic to engage people with impaired motor functions in experiments, wherein they may face severe pain and unacceptable risk of injuries. We developed a wearable robot for healthy adults and its control algorithm to simulate the behaviors of patients with knee osteoarthritis. We focused on invariant motions, which are typically presented for avoiding knee pain. In order to simulate patient movements by a healthy person wearing a robot, we formulated a model motion that represented invariant patient motions. We then determined the output torque of the exoskeletal knee robot such that the wearer's motion followed the model motion. The effectiveness of the method was testified for standing-up and sitting-down motions, and some characteristic impaired motions such as body inclination to the healthy side and imbalanced right and left knee angles were manifested by the simulator.

关键词： Robot output torque Wearable Invariant Patients Knee pain severe pain Knee osteoarthritis computer algorithms

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Development of a Plug-and-Play Multiple RTU Coordination Control Algorithm for Small/Medium Commercial Buildings

Development of a Plug-and-Play Multiple RTU Coordination Con...

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American Control Conference

作者： Donghun Kim James E. Braun Jie Cai Jianghai Hu School of Mechanical Engineering Purdue University West Lafayette IN USA Electrical and Computer Engineering Purdue University West Lafayette IN USA

ISBN: (纸本)9781479917730

There have been very few advanced control algorithms developed for small commercial buildings due to practical difficulties such as the spatial comfort variations, significant disturbances, high sensor costs, and high cost of site-specific engineering solutions. High implementation cost has been a major impediment to successful market penetration. The focus of this work is to develop and demonstrate plug-and-play optimal coordination of multiple roof top units (RTUs). The goal is to minimize the time required to configure the control strategy in order to enable a more cost effective control implementation for small commercial building applications.

关键词： commercial buildings Plug and play control strategy computer algorithms coordinated control

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Development of a high fidelity CFD code for wind farm control

Development of a high fidelity CFD code for wind farm contro...

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American Control Conference

作者： Christian Santoni Umberto Ciri Mario Rotea Stefano Leonardi Department of Mechanical Engineering The University of Texas at Dallas TX 75080

ISBN: (纸本)9781479917730

In this paper we describe an effort recently completed at UT Dallas to develop a high-fidelity computational fluid dynamics code to test and develop control algorithms aimed at maximizing power production and load mitigation. Preliminary results of three aligned turbines operating at different tip speed ratios (TSRs) are discussed to show the wealth of details available from the present code. The finer solution of the flow physics allows to gain a better understanding of how control algorithms should be designed and implemented in practical configurations. The paper includes a detailed analysis of the power and loads for optimal TSRs obtained by applying dynamic programming to a low-fidelity analytical model.

关键词： computer algorithms high fidelity dynamic programming Codes Power production Wind farms LOAD tip speed

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