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2012 3rd Power Electronics, Drive systems and Technologies Conference, PEDSTC 2012

作者： Dehghani, Mohammad T. Vahedi, Abolfazl Savaghebi, Mehdi Guerrero, Josep M. Department of Power Engineering Saveh Branch Islamic Azad University Saveh Iran Center of Excellence for Power System Automation and Operation Iran University of Science and Technology Iran Department of Electronics Engineering Karaj Branch Islamic Azad University Karaj Iran Department of Automatic Control and Industrial Informatics Technical University of Catalonia Spain Institute of Energy Technology Aalborg University Denmark

ISBN: (纸本)9781467301114

The aim of this paper is to improve voltage quality at the terminals of distributed generators (DGs) in an islanded microgrid. To achieve this goal, it is proposed to include separate voltage and current control loops for the fundamental and harmonics frequencies. This way, it is not necessary to consider additional controllers to provide voltage harmonic compensation. The proposed control system can be implemented in a very simple way. The control structure of every single DG unit consists of active and reactive power droop controllers and voltage and current control loops. Simulation results are provided in order to show the effectiveness of the proposed control approach. © 2012 IEEE.

关键词： Harmonic analysis

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Optimal Solutions to Robust Stabilization Problem for a Class of systems with Parametric Uncertainty

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IFAC Proceedings Volumes 2012年第13期45卷 156-161页

作者： Qinghe Wu Li Xu Mohamed Mansour School of Automation Beijing Institute of Technology Beijing 100081 China Faculty of System Science and Technology Dept. of Electronics and Information Systems Akita Prefectural University Akita 015-0055 Japan Automatic Control Laboratory Swiss Federal Institute of Technology Zurich ETH Zentrum CH-8092 Zürich Switzerland

This paper tackles the robust stabilization problem for the plant family described by the transfer function set P ( s, δ , δ ) whose coefficients of the denominator and the numerator polynomials are affine in a real uncertain parameter vector δ satisfying the norm constraint || δ || p ≤ δ for p ≥ 1. It is shown that there exists a fixed controller robustly stabilizing all the members of P ( s, δ , δ ) if and only if its every member plant is free of unstable pole-zero cancelation. The optimal robust stabilizer is characterized in terms of a three dimensional frequency dependent Hahn-Banach minimizer. Classes of P ( s, δ , δ ) are characterized using Nevanlinna-Pick interpolation theory. For these classes optimal robust stabilizers can be obtained in closed forms using ℋ ∞ -optimization technique.

关键词： real parameter uncertainty parametric robust stabilization stabilizability radius stability radius ℋ ∞ -optimization

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Hierarchical control scheme for voltage harmonics compensation in an islanded droop-controlled microgrid

Hierarchical control scheme for voltage harmonics compensati...

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2011 IEEE 9th International Conference on Power Electronics and Drive systems, PEDS 2011

作者： Savaghebi, Mehdi Guerrero, Josep M. Jalilian, Alireza Vasquez, Juan C. Lee, Tzung-Lin Center of Excellence for Power System Automation and Operation Iran University of Science and Technology Iran Department of Automatic Control and Industrial Informatics Technical University of Catalonia Spain Institute of Energy Technology Aalborg University Denmark Department of Electrical Engineering National Sun Yat-sen University Taiwan

ISBN: (纸本)9781612849997

In this paper, a microgrid hierarchical control scheme is proposed which includes primary and secondary control levels. The primary level comprises distributed generators (DGs) local controllers. The local controller mainly consists of active and reactive power controllers, voltage and current controllers, and virtual impedance loop. A novel virtual impedance structure is proposed to achieve proper sharing of non-fundamental power among the microgrid DGs. The secondary level is designed to manage compensation of voltage harmonics at the microgrid load bus (LB) to which the sensitive loads may be connected. Also, restoration of LB voltage amplitude and microgrid frequency to the rated values is directed by the secondary level. These functions are achieved by sending proper control signals to the local controllers. The simulation results show the effectiveness of the proposed control scheme. © 2011 IEEE.

关键词： controllers

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The Minimum Principle for Time-Varying Hybrid systems with State Switching and Jumps

The Minimum Principle for Time-Varying Hybrid Systems with S...

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IEEE Conference on Decision and control

作者： Benjamin Passenberg Marion Leibold Olaf Stursberg Martin Buss Institute of Automatic Control Department of Electrical Engineering and Information Technology Technische Universitat Munchen Munchen Germany Institute of Control and System Theory Department of Electrical Engineering and Computer Science University of Kassel Kassel Germany

ISBN: (纸本)9781612848006

The hybrid minimum principle (HMP) is extended to hybrid systems with autonomous (internally forced) switching on switching manifolds, controlled (externally forced) switching, jumps of the continuous state when switching, and time-varying functions for specifying the continuous and discrete dynamics. The formulation of the hybrid optimal control problem (HOCP) includes running, switching, and terminal costs. The HMP provides necessary optimality conditions for a solution of the HOCP and can be used as basis for developing numerical optimal control algorithms.

关键词： minimum principle hybrid systems switching time varying Manifolds

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Hierarchical control scheme for voltage unbalance compensation in islanded microgrids

Hierarchical control scheme for voltage unbalance compensati...

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Annual Conference of Industrial Electronics Society

作者： Mehdi Savaghebi Josep M. Guerrero Alireza Jalilian Juan C. Vasquez Center of Excellence for Power System Automation and Operation Iran University of Science and Technology Iran Department of Automatic Control and Industrial Informatics Technical University of Catalonia Spain Institute of Energy Technology Aalborg University Denmark

The concept of microgrid hierarchical control is presented, recently. In this paper, a hierarchical scheme which includes primary and secondary control levels is proposed for islanded microgrids. The primary control level consists of DG local controllers. Local controller of each DG comprises active and reactive power controllers, virtual impedance loop and voltage and current controllers. The secondary level is designed to compensate the voltage unbalance at the load bus (LB) of the islanded microgrid. Also, restoration of LB voltage amplitude and microgrid frequency to the rated values is considered in the secondary level. These functions are achieved by proper control of distributed generators (DGs) interface converters. The presented simulation results show the effectiveness of the proposed control structure in compensating the voltage unbalance and restoring the voltage amplitude and system frequency.

关键词： Voltage control Reactive power Impedance Frequency control Inverters Erbium control systems

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Hierarchical control scheme for voltage Harmonics Compensation in an islanded droop-controlled microgrid

Hierarchical control scheme for voltage Harmonics Compensati...

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International Conference on Power Electronics and Drive systems (PEDS)

作者： Mehdi Savaghebi Josep M. Guerrero Alireza Jalilian Juan C. Vasquez Tzung-Lin Lee Center of Excellence for Power System Automation and Operation Iran University of Science and Technology Iran Department of Automatic Control and Industrial Informatics Technical University of Catalonia Spain Institute of Energy Technology University of Aalborg Denmark Department of Electrical Engineering National Sun Yat-sen University Taiwan

关键词： Harmonic analysis Voltage control Power harmonic filters Impedance Frequency control Resistance

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Simulation and test of backscattering from nonspherical soot particles swarm using laser

Simulation and test of backscattering from nonspherical soot...

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2010 Academic Symposium on Optoelectronics and Microelectronics Technology and 10th Chinese-Russian Symposium on Laser Physics and Laser Technology, RCSLPLT/ASOT 2010

作者： Xing, Jian Zhao, Jiaqun Liu, Yang Sun, Xiaogang College of Science Harbin Engineering University Harbin China State Key Laboratory of Tunable Laser Technology Harbin Institute of Technology Harbin China Harbin Institute of Technology Insititute of Automatic Detecting and Process Control System Harbin China

ISBN: (纸本)9781424455133

When the backscattering method is adopted to test the concentration and the size of soot, it's very important to analyze the backscattering characteristics of soot to determine the optimal light source, detector and detection angle. In this paper, the backscattering characteristics of nonspherical soot particles swarm are investigated. The size and shape of soot particles are determined by microscopic measurement. According to the micrograph, both Ellipsoid model and generalized Chebyshev models are selected to imitate soot particles. With the Monte-Carlo method, a random oriented particles swarm is created, and backscattering relative intensity is calculated by T-matrix method with different parameters. A simple backscattering test system was established, in which the light source and detector are selected based on the calculation results. The numerical and experimental results show that the combination of the Monte- Carlo method and the T-matrix calculation can be successfully applied to simulate the backscattering of the nonspherical particles swarm, and the experimental system has higher backscattering intensity according to simulation result. It provides a reference for improving the measurement accuracy of particles size and concentration. © 2010 IEEE.

关键词： Backscattering

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Improving motion of robotic manipulators by an embedded optimizer

Improving motion of robotic manipulators by an embedded opti...

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2010 IEEE International Conference on Automation science and Engineering, CASE 2010

作者： Ding, Hao Schnattinger, Georg Passenberg, Benjamin Stursberg, Olaf Institute of Control and System Theory Dept. of Electrical Eng. and Computer Science University of Kassel Germany Institute for High-Frequency Engineering Technische Universität München 80290 München Germany Institute of Automatic Control Engineering Technische Universität München 80290 München Germany

ISBN: (纸本)9781424454471

A control scheme for efficient and safe path and motion planning of industrial robots is proposed. For motion planning of robotic manipulators, an offline method is developed which generates feasible trajectories of the joints such that a given performance criterion is maximized. The planning problem considering obstacle avoidance is converted to an optimization problem with interior points for the joint angles to guide the trajectory away from obstacles. The interior points are generated from an approach of rapidly exploring random trees (RRTs] in the configuration and time space. The method is applied to a 3-DOF-robot with known dynamic moving obstacles and evaluated afterwards. Online motion generation of industrial robots is then discussed for a human robot interaction scenario. ©2010 IEEE.

关键词： Motion planning

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VVAF - Worst case & safety analysis tools for autonomous rendezvous system

VVAF - Worst case & safety analysis tools for autonomous ren...

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AIAA Guidance, Navigation, and control Conference

作者： Paulino, Nuno Di Sotto, Emanuele Salehi, Sohrab Kron, Aymeric Hamel, Jean-François Wang, Wenfei Menon, Prathyush P. Bates, Declan G. Papachristodoulou, Antonis Maier, Christoph GMV Tres Cantos Madrid Spain Rhea System at ESA-ESTEC Noordwijk Netherlands NGC Aerospace Mouans Sartoux France NGC Aerospace Sherbrooke Canada Control and Instrumentation Research Group Department of Engineering University of Leicester Leicester United Kingdom Department of Engineering Science University of Oxford Oxford United Kingdom Institute for Systems Theory and Automatic Control University of Stuttgart Stuttgart Germany

ISBN: (纸本)9781600869624

The traditional verification and validation (V&V) process can produce sufficiently safe and reliable systems in the demanding aerospace field. But this comes at great cost and effort, with the necessary simulation of all possible operational conditions for increasingly complex control systems involving substantial autonomy. It is of interest to go beyond the statistical confidence of traditional Monte Carlo methods. New V&V methods need to cope with a large number of mission parameters and mode transitions. They must identify the worst combinations of perturbations, uncertainties and failures. Two classes of frameworks are investigated in the VVAF project: integrated V&V frameworks (IVVF) supported by simulation based analysis techniques, either integrated or with local analysis techniques to establish the global system properties;and enhanced V&V frameworks (EVVF), based on mathematical proof. Two EVVF techniques are explored: Barrier-construction and Reachability-set analysis. These guarantee fulfillment of globally exact safe operation, by the construction of barrier certificates considering nonlinearities, uncertainties and constraints. In addition, two IVVF techniques are developed: Analytical-based (AIVV) and Optimization-based (OIVV). AIVV consists of integrating and embedding frequency domain LFT-based mu-analysis techniques to exclude regions with guaranteed performance and/or identify the most critical areas, within a Monte Carlo simulation based V&V. With as few runs as possible of the non linear time simulator, local analyses can steer the global search towards the worst case. OIVV uses optimization techniques, also linked to the simulator, to identify and characterize the system worst case. Several heuristic techniques are evaluated for global parameters search, which is then refined using local optimization techniques to locate and characterize the worst case. The AIVV can also aid the OIVV by identifying search regions and promising initialization poi

关键词： Monte Carlo methods

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Simulation and test of backscattering from nonspherical soot particles swarm using laser

Simulation and test of backscattering from nonspherical soot...

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Russian-Chinese Symposium on Laser Physics and Laser Technologies (RCSLPLT) and Academic Symposium on Optoelectronics Technology (ASOT)

作者： Xing Jian Zhao Jiaqun Liu Yang Sun Xiaogang Insititute of Automatic Detecting and Process Control System Harbin Institute of Technology Harbin China State Key Laboratory of Tunable Laser Technology Harbin Institute of Technology Harbin China College of Science Harbin Engineering University Harbin China

When the backscattering method is adopted to test the concentration and the size of soot, it's very important to analyze the backscattering characteristics of soot to determine the optimal light source, detector and detection angle. In this paper, the backscattering characteristics of nonspherical soot particles swarm are investigated. The size and shape of soot particles are determined by microscopic measurement. According to the micrograph, both Ellipsoid model and generalized Chebyshev models are selected to imitate soot particles. With the Monte-Carlo method, a random oriented particles swarm is created, and backscattering relative intensity is calculated by T-matrix method with different parameters. A simple backscattering test system was established, in which the light source and detector are selected based on the calculation results. The numerical and experimental results show that the combination of the Monte-Carlo method and the T-matrix calculation can be successfully applied to simulate the backscattering of the nonspherical particles swarm, and the experimental system has higher backscattering intensity according to simulation result. It provides a reference for improving the measurement accuracy of particles size and concentration.

关键词： Backscatter Scattering Particle measurements Atmospheric measurements Detectors Light sources Simulation

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