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检索条件"主题词=Computer algorithms"

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Verifiable Frequency-limited Adaptive Control Performance Based on Linear Matrix Inequalities

Verifiable Frequency-limited Adaptive Control Performance Ba...

引用

IEEE Annual Conference on Decision and Control

作者： Mario Luca Fravolini Tansel Yucelen Daniel Wagner Ali Albattat Paolo Valigi Universita degli Studi di Perugia Dipartimento di Ingegneria Via G. Duranti No 93 06125 Perugia Italy Dept. of Mechanical and Aerospace Engineering Missuri University of Science and Technology Rolla MO 65409 Dept. of Mechanical and Aerospace Engineering Missouri University of Science and Technology Rolla MO 65409

ISBN: (纸本)9781467360890

Adaptive controllers are often criticized for the lack of clear and easy verification procedures that relate design parameters to time domain performance especially during transients. For this reason it is a challenge to rigorously certify existing adaptive control algorithms. To that end, we propose a validation framework where stability and performance requirements are formulated in terms of Linear Matrix Inequalities. This brings the advantage that adaptive controller design and verification can be analyzed and optimized via the solution of a convex optimization whose objective is to guarantee the evolution of the error components within an a-priori specified domain. This approach was cast to verify the performance of the recently introduced Frequency-limited adaptive control scheme. A detailed case study is presented to show the efficacy of the proposed verification architecture.

关键词： linear matrix inequalities adaptive controller adaptive control Verification control performance error component computer algorithms controller design Convex function TIME-DOMAIN

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A Comparative Analysis of Direct Power Control algorithms for Three-Phase Power Inverters

A Comparative Analysis of Direct Power Control Algorithms fo...

引用

IEEE Power and Energy Society General Meeting

作者： Nasser Mendoza Jhon Pardo María Mantilla Johann Petit Grupo de Investigación en Sistemas de Energía Eléctrica (GISEL) Universidad Industrial de Santander (UIS) Bucaramanga Colombia

ISBN: (纸本)9781479913022

This paper presents a comparative analysis between three control techniques based on the Direct Power Control (DPC) algorithm for grid-tied Voltage Source Inverters (VSI). These techniques are used to regulate the injection of instantaneous active and reactive powers in a power system for renewable generation system applications. The first technique corresponds to the Classical DPC (C-DPC) and it is based on the definition of a Virtual Flux (VF). In the second one, the instantaneous active and reactive powers are estimated by using the time derivatives of the injected currents, without any voltage sensors. The third algorithm uses the Space Vector Modulation (SVM) technique to generate additional space vectors and it considers the minimum square error of the instantaneous active and reactive powers to determine the switching states. Simulation results of the three control techniques are presented and their performance is compared based on some criteria such as maximum steadystate power error, the current total harmonic distortion and the rise time.

关键词： Direct Analysis Comparative Reactive power computer algorithms quadratic errors Mentoring direct power PULSE RISE TIME voltage source inverter three-phase power power systems Analysis time derivative Control technology Inventors

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Comparative Analysis and Control of Bidirectional DC-DC Converters

Comparative Analysis and Control of Bidirectional DC-DC Conv...

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IEEE International Conference on Energy, Systems and Information Processing

作者： Kunalkumar Bhatt Ram Avtar Gupta Nitin Gupta Department of Electrical Engineering Malaviya National Institute of Technology (MNIT)

ISBN: (纸本)9781728104201

The bidirectional DC-DC converters (BDC) is extensively promoted for numerous applications. Dual-active-bridge (DAB) converter is preferred among all other BDC converters for medium and high power application. There are some key challenges of isolated boost based BDC converters. Isolated boost based BDC converters offer high voltage spike, high current stress, and additional conduction losses due to flowing the freewheeling current in the switches of the low-voltage-side bridge of DAB converter. The auxiliary clamping circuits have been required to mitigate freewheeling current. The BDC converter with dual-switch forward (DSF) snubber has been presented in this paper. The converter operation of the BDC converter has been discussed. The various auxiliary clamping circuits have been explained. The control algorithm of the BDC DSF snubber circuit has been conferred. The comparative analysis has been considered among all BDC converters with the auxiliary clamping circuits. The PSIM simulation tool has been chosen to verify the effectiveness of the converter in the closed-loop control of the converter. The simulation results show the effectiveness of the converter.

关键词： BDC converter Flyback snubber Isolated boost converter Isolated snubber Converters backup domain controller clamping circuits computer algorithms DC converter Audio recording Conduction losses DC-DC power convertors DC to DC converters Standing Orders

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The servo control system of three-axis video tracking platform

The servo control system of three-axis video tracking platfo...

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IET International Conference on Information Science and Control Engineering 2012 (ICISCE 2012)

作者： Junqing Dong Ru Lai Xiangdong Liu Sch. of Autom. Beijing Inst. of Technol. Beijing China School of Automation Beijing Institute of Technology 100081 China

ISBN: (纸本)9781629939254

This paper discusses the servo control system of three-axis stabilized video tracking platform. The system mechanical structures, and the hardware of servo control system are introduced. In order to achieve tracking accuracy, an improved square control algorithm and feed forward scheme are implemented in the system. Both the debugging and tracking experiments have been carried out. The results demonstrate the designed servo control system and its control algorithms for three-axis video tracking platform are effective.

关键词： Tracking platform Servo control Fuzzy PID Feed-forward Compound control servo control system composite control FEEDFORWARD Servo control control systems computer algorithms Videotapes Platform tracking Servo Debugging

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Proposal of Hardware-in-the-loop control platform for small fixed-wing UAVs

Proposal of Hardware-in-the-loop control platform for small ...

引用

Annual IEEE International Systems Conference

作者： Rauhe Abdulhamid Neusa M. F. de Oliveira Roberto d'Amore Departamento de Engenharia Eletronica e Computacao Instituto Tecnologico de Aeronautica

ISBN: (纸本)9781467395205

Unmanned Aerial Vehicles (UAVs) have received considerable attention from the academic community and technology solutions companies, given their civilian and military applications. The autopilot system shall be thoroughly tested in lab because an accident may cause irreversible damage to the UAV. This article presents a proposal of a Hardware-In-the-Loop platform for testing and validation of a small fixed-wing aircraft. Besides a communication system, it was developed a deflection measurement platform of the aircraft control surfaces. This measurement platform was validated, enabling future work on implementing embedded control algorithms.

关键词： Hardware-In-the-Loop systems UAVs Measurement of airplane control deflections Unmanned Aerial Vehicle computer hardware CONSOLE HARDWARE IN THE LOOP Aircraft control Fixed wing aircraft fixed wings COMMUNICATION SYSTEMS computer algorithms drone honey bees work implement

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Hierarchical Management of Distributed Energy Resources Using Chance-Constrained OPF and Extremum Seeking Control

Hierarchical Management of Distributed Energy Resources Usin...

引用

American Control Conference

作者： Yue Chen Yashen Lin Power Systems Engineering Center National Renewable Energy Laboratory Golden CO 80401 USA

ISBN: (纸本)9781538679012;9781538679265

Distributed energy resources (DERs) are becoming an important part of distribution systems, because of their economic and environmental benefits. Although their inherent intermittency and volatility introduce uncertainties into the electric power system, they have the potential to provide controllability to the system under proper coordination. In this paper, we propose a hierarchical control algorithm for distribution systems with DERs so that they have controllability similar to a generator bus. The upper level scheduler solves a chance-constrained optimal power flow (OPF) problem to plan the operation of the DERs based on forecasts, and the lower level distributed DER controllers leverage the extremum seeking approach to deliver the planned power at the feeder head. The proposed algorithm is tested on a modified IEEE 13-node feeder, demonstrating its effectiveness.

关键词： distributed energy resources dispensing system extremum values Feeders power systems Energy sources controllability computer algorithms Environmental services Volatility Optimal control

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Impact of distributed generation units with power electronic converters on distribution network protection

Impact of distributed generation units with power electronic...

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2008 IET 9th International Conference on Developments in Power System Protection (DPSP 2008)

作者： J. Morren S.W.H. De Haan Essent Netwerk B.V. Hertogenbosch Netherlands

An increasing number of distributed generation units (DG units) are connected to the distribution network. These generators affect the operation and coordination of the distribution network protection. The influence from DG units that are coupled to the network with a power electronic converter (PEC) is different from that of conventional DG units with an electrical machine directly coupled to the network. This contribution shows that PEC-based DG units can be controlled in such a way that the negative influence on the distribution network protection is limited. A decision tree and a flow-chart are presented that show how a PEC-based DG should respond to network faults. The flow-chart can be used in real time to bring the proper control algorithm in operation during a fault.

关键词： Distributed Generation Power electronics Distribution network Protection Power grids distributed power generation Power electronics network protection Flowcharts DIESEL GENERATOR computer algorithms Converters Decision Trees Electronics

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Substation Day-ahead Automated Volt/VAR Optimization Scheme

Substation Day-ahead Automated Volt/VAR Optimization Scheme

引用

IEEE Power and Energy Society General Meeting

作者： B. Milosevic A. Vukojevic K. Mannar GE Digital Energy 4200 Wildwood Parkway Atlanta GA 30339 Constellation Energy Baltimore MD 21203 Accenture Analytics Singapore

ISBN: (纸本)9781467327275

This paper proposes a new control algorithm to run a Volt/VAR optimization (VVO) scheme. The expected benefit of the proposed VVO control algorithm is to increase effectiveness of the VVO scheme by identifying optimal times when VVO scheme needs to be turned On and Off. The VVO effectiveness is measured in terms of saved kWh. A NN (Neural Network) based prediction model is used to identify optimal VVO strategy. A NN is designed to provide day-ahead hourly energy prediction at each substation with VVO scheme by using a number of predictors, such as hourly ambient conditions, day of the week, time of the day, etc. A NN is used for its ability to model nonlinear and complex interactions of predictors to provide accurate day-ahead predictions. The proposed approach is illustrated using an actual case study.

关键词： Energy Neural Networks optimization power grids reactive power smart grids voltage. computer algorithms Scheme Hourly Nonlinear Models Case studies Automation Substations

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RFPT-based Adaptive Control of a Small Aeroplane Model

RFPT-based Adaptive Control of a Small Aeroplane Model

引用

IEEE International Conference on Intelligent Engineering Systems

作者： Krisztian Kosi Jozsef K. Tar Imre J. Rudas Doctoral School of Applied Informatics Obuda University Antal Bejczy Centre of Intelligent Robotics Obuda University

ISBN: (纸本)9781479908271

The realization of small, unmanned, automatic airplanes is a significant project at Obuda University. Essential results have been achieved regarding automatic take-off and navigation. Another important research field is development of design methods for adaptive controllers as alternatives to the Lyapunov function technique. For guaranteeing global stability this method means the realization of a complicated process that does not reveal subtle details of the trajectory tracking of the controlled system. These details depend on the numerous adaptive parameters of the Lyapunov function the optimal setting of which can be achieved e.g. by evolutionary techniques and ample numerical investigations. The suggested alternative primarily concentrated on these details and has only a few parameters. Without complementary parameter tuning only local stability can be achieved, but for a wide set of physical systems tuning only one of its parameters can maintain global stability. Our aim is to integrate these researches. The here presented results, i.e. that of simulation investigations on the "Robust Fixed Point Transformations (RFPT)" based control of the linearized model of a small airplane mean the first definite step in this direction. The convergence of the controller is stabilized by independent agents (model-independent observers) that are able to recognize whether the tuned control parameter approached the boundary of convergence and intervenes the tuning process accordingly. The expectation is the improvement of the already existing control algorithms.

关键词： Liapunov function overall buckling tuning adaptive controller local stability plane control parameter trajectory tracking computer algorithms AUTOMATIC Converge adaptive control

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Finite Element Based Analytical Model for Controller Development of Switched Reluctance Machines

Finite Element Based Analytical Model for Controller Develop...

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IEEE Energy Conversion Congress and Exposition

作者： Rajib Mikail Iqbal Husain Mohammad Islam North Carolina State University Raleigh NC USA Nexteer Automotive Saginaw MI USA

ISBN: (纸本)9781479903375

This paper presents a novel method of modeling SRM including mutual coupling effect based on Finite Element Analysis (FEA). Once the machine geometry and design is completed in FEA, it is required to analyze the performance of the machine at different operating conditions with different control methods. Designing control algorithm with FEA in the loop is not convenient because of the complexity and simulation time involved. An analytical model performing similar to the FEA model and including the mutual coupling effect is desired during tuning of the control algorithm at different modes and variable speeds of operation. The self and mutual λ-i-θ characteristics of the machine can be derived from the FEA model and stored in a look-up table. A state space model based on the λ-i-θ characteristics of the machine is developed which can be readily coupled to any controller model. The method incorporates the mutual coupling effect which cannot be neglected for accurate modeling and good controller performance.

关键词： cross-coupling effect Finite element method Reluctance motors machine computer algorithms Variable speed ANALYSIS MODELS Controllers Control Methods switched reluctance machine State space models

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